JP2005152849A - Floating particulate collection filter, suspended particulate collection method using the same, suspended particulate analysis method, and suspended particulate collection apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter for collecting floating particles that can be easily and quickly classified and collected in a state where the suspended particles are separated, a method for collecting suspended particles, a method for analyzing suspended particles, and a method for collecting suspended particles. An object is to provide a collecting device.
SOLUTION: The suspended particulate collection filter 1 of the present invention comprises a porous membrane having a thickness of 0.1 μm to 20 μm, and the pore diameter of the pore 2 is 20 μm or less, preferably 0.1 μm to 10 μm. It has a configuration with an open area ratio of 45% to 75%. The suspended particulate collection method of the present invention has a configuration including a setting step for setting the suspended particulate collection filter 1 in an air passage and a suction step for sucking gas into the air passage. The suspended particulate analysis method of the present invention has a configuration including a particulate collection step, an imaging step, and a particulate measurement step. The suspended particulate collection device of the present invention has a configuration including a housing, a suspended particulate collection filter, and a filter feed section.
[Selection] Figure 1

Description

  The present invention easily collects solid or liquid suspended fine particles floating in the atmosphere, etc., and measures the shape and size of the collected suspended fine particles and the relative position and distance between the suspended fine particles. The present invention relates to a filter for collecting floating particles, a method for collecting suspended particles, a method for analyzing suspended particles, and a device for collecting suspended particles.

Conventionally, gaseous chemical substances such as carbon dioxide, NOx, and SOx have been emphasized as substances that cause air pollution, but these have been basically grasped as average values of concentrations in the atmosphere. In addition, other substances that cause air pollution include non-gaseous substances such as dust and dust, which have been collected and analyzed and measured as an average value in the atmosphere. However, it is insufficient to accurately determine the cause of air pollution in the average value measurement, and even in the case of acid rain, the mist state before rain actually has the lowest pH.
The pollutants that affect the ecology are trace liquid suspended particles containing chemical substances such as the above-mentioned acidic mist and volatile chemicals that cause sick house syndrome, sea salt particles, yellow sand, It is often a solid suspended fine particle such as a metal oxide, pollen or dust. Therefore, it is extremely important to measure and detect the individual size and shape of the suspended fine particles suspended in the atmosphere, or the properties of the chemical substances contained therein. However, conventionally, the individual size, shape, or properties of liquid or solid suspended fine particles suspended in the atmosphere are measured and analyzed to obtain a two-dimensional distribution or particle size distribution in a plane in the atmosphere. In addition, a method for easily obtaining the temporal change of the two-dimensional distribution and particle size distribution has not been established.
As a conventional analysis method for individual suspended fine particles, roughly divided, a method of collecting fine particles floating in an atmosphere such as air once in a filter, etc., and analyzing the collected individual fine particles, There is a method of continuously analyzing suspended fine particles suspended in an atmosphere such as the air in a suspended state. The analysis method for collecting and analyzing floating particles once in a filter, etc., is to collect the fine particles floating in the atmosphere once in a filter, and then use X-ray microanalysis or emission spectroscopic analysis for the collected individual particles. , Secondary ion mass spectrometry, laser microprobe mass spectrometry, and the like are used. When analyzing by emission spectroscopic analysis, each suspended fine particle collected by a filter or the like is sequentially taken out to cause plasma emission, and the size and components are measured based on the intensity and emission wavelength, and the number of extractions is taken. The number of particles is calculated from
On the other hand, as an analysis method for continuously analyzing suspended fine particles suspended in an atmosphere such as the air in a suspended state, for example, each suspended particulate suspended in an atmosphere such as the atmosphere collides with an ionization heating source. In addition, a method is known in which an ion group generated by this collision is introduced into a mass spectrometer for analysis. In addition, airborne fine particles in the atmosphere are drawn into vacuum through capillaries, nozzles, etc., and the individual airborne fine particles that are drawn in are excited by excimer laser and ionized by laser desorption. A method of analyzing the diameter and components with a time-of-flight mass spectrometer, and a quadrupole mass spectrometer that decomposes, excites, and ionizes suspended fine particles suspended in the atmosphere with high-frequency inductively coupled plasma, A method of analyzing by, for example, is known. An analysis method for quantitatively determining the particle size, the number of particles, components, etc. of fine particles such as nm particles and clusters having a particle size of about 1 to 100 nm has been devised and disclosed in Patent Document 1.

In addition, Japanese Patent Application No. 2003-97145 states that “a predetermined region of a band-shaped fine particle collector disposed in a housing having an opening is exposed to a gas containing floating fine particles for a predetermined time to collect the floating fine particles, Floating particle analysis method for capturing the predetermined area and processing the captured image to measure the shape, size, property, or the relative position or distance between the floating particles, and the particle collection used in the method Device "is described. The fine particle collector used in the fine particle analysis method described in Japanese Patent Application No. 2003-97145 includes synthetic resin films such as polystyrene, polybutadiene, polyethylene, glass fiber filters, quartz fiber filters, fluororesin filters, and the like. The use of these filters is described.
JP-A-10-288602

However, the above conventional techniques have the following problems.
(1) In any of the conventional analysis methods described above, the suspended fine particles are once collected, and the collected suspended fine particles are dispersed and analyzed in gas or liquid by dispersion or ionization. When measuring, the solvent of suspended fine particles in which the substance is dissolved during ionization etc. evaporates, and the particle size of the suspended fine particles becomes small or the concentration of the substance becomes high, so it cannot be measured accurately. There was a problem that it was not suitable for the measurement of fine particles.
(2) When collecting fine particles, depending on the type of the collected floating fine particles, the fine particles may react with each other, resulting in a compound that is different from the floating state in the atmosphere. Had the problem of not being able to.
(3) It is necessary to use a large and expensive analyzer. Therefore, it is difficult to continuously and quickly analyze suspended particulates in the atmosphere at the site where suspended particulates are collected. It was difficult to obtain environmental data related to local suspended particles in the atmosphere, which is indispensable for measures such as prolonging the lifespan and other effects on ecosystems.
(4) In the fine particle collector described in Japanese Patent Application Laid-Open No. 2003-97145, even if a filter such as a glass fiber filter, a quartz fiber filter, or a fluororesin filter is used, the collected fine particles are classified accurately. The problem was that it was difficult to collect. This is because the fine particles enter the gaps between the filter fibers, so that it is difficult to separate and analyze the filter fibers when capturing and analyzing the image as it is collected. Because aggregation is promoted, separation analysis of fine particles becomes difficult during analysis.

The present invention solves the above-described conventional problems, and an object of the present invention is to provide a filter for collecting suspended particles that can be easily and quickly classified and collected in a state where the suspended particles are separated from each other.
Another object of the present invention is to solve the above-described conventional problems, and to provide a method for collecting suspended particles that can be easily and quickly classified and collected in a state where the suspended particles are separated from each other.
Furthermore, the present invention solves the above-mentioned conventional problems, and can easily and quickly classify and collect suspended particulates at a site where suspended particulates are collected, and can be collected in individual sizes, shapes, properties, or individual It is an object of the present invention to provide a method for analyzing suspended particles that can accurately measure the relative position between the particles and the distance between the particles.
In addition, the present invention solves the above-described conventional problems, and can easily and quickly classify and collect suspended particulates at a site where suspended particulates are collected and continuously collect suspended particulates. It is an object of the present invention to provide a floating particulate collection device that can perform the above-mentioned.

In order to solve the above-described problems, a suspended particulate collection filter, a suspended particulate collection method, a suspended particulate analysis method, and a suspended particulate collection apparatus using the same have the following configurations.
The filter for collecting suspended particulates according to claim 1 of the present invention comprises a porous film having a thickness of 0.1 μm to 20 μm having a large number of pores formed of a polymer compound dissolved in a hydrophobic organic solvent, The pore diameter of the pores is 20 μm or less, preferably 0.1 μm to 10 μm, and the porosity of the porous membrane is 45% to 75%.

This configuration has the following effects.
(1) Since the filter for collecting floating particulates is composed of a porous film having a large number of pores, the suspended particulates can be individually captured at each pore and collected in a separated state.
(2) Since the hole diameter of the hole is 20 μm or less, preferably 0.1 μm to 10 μm, sea salt particles or yellow sand floating in a gas such as the atmosphere, metal oxide, sulfur oxide, pollen, It is possible to accurately classify and collect airborne particles such as dust and bacteria. In particular, since the particle size distribution of the floating fine particles to be collected has peaks near 7 μm and 0.5 μm, it can be suitably used for collecting the floating fine particles.
(3) Since the porosity of the porous film is 45% to 75%, it is possible to accurately classify and collect suspended fine particles while passing a gas such as air containing suspended fine particles. The suspended fine particles having a particle size smaller than the pore size are not easily caught or clogged.
(4) By appropriately setting the hole diameter of the hole within a range of 20 μm or less, preferably 0.1 μm to 10 μm, various suspended fine particles can be classified and collected for each particle diameter.
(5) Since suspended particles are trapped in the holes formed regularly aligned with the porous film, it is easy to detect the holes supplemented with the suspended particles. For example, the number of blocked holes is counted. This makes it possible to quickly count the number of fine particles. Further, since the position of the trapped suspended fine particles coincides with the position of the hole, it can be detected accurately, and the probe can be easily positioned during the detailed analysis.

Here, examples of the hydrophobic organic solvent include aromatic hydrocarbons such as benzene, toluene, and p-xylene, halogenated aromatic hydrocarbons such as monochlorobenzene, o-dichlorobenzene, and trichlorobenzene, chloroform, carbon tetrachloride, and chloride. Halogenated aliphatic hydrocarbons such as methylene, trichlorethylene, and perchloroethylene, and aliphatic hydrocarbons such as pentane, hexane, heptane, and octane are used.
Examples of the polymer compound include general-purpose polymers such as polystyrene, polymethyl methacrylate, and polybutyl methacrylate, engineering plastics such as polysulfone and polycarbonate, polyion complexes, thermoplastic elastomers (eg, 1,4-butadiene polymer), poly Biodegradable polymers such as lactic acid, polyhydroxybutyric acid, glycolic acid-lactic acid copolymer, polyimide having heat resistance and chemical resistance, and the like are used. As the polymer compound, various compounds can be used as long as they are soluble in the above-described hydrophobic organic solvent.
As a method for producing the porous film, a method in which a solution in which the above-described polymer compound is dissolved in a hydrophobic organic solvent is cast on a substrate, sprayed with high-humidity air, and the hydrophobic organic solvent is evaporated is used. Note that the amphiphilic polymer compound may be dissolved in the hydrophobic organic solvent together with the polymer compound. As a mixing ratio of the polymer compound and the amphiphilic polymer compound, a weight ratio of, for example, 5: 1 to 20: 1 is used. As the amphiphilic polymer compound, amphiphilic polyacrylamide or the like is used.
The thickness of the porous film is 0.1 μm to 20 μm.
The hole diameter is 20 μm or less, preferably 0.1 μm to 10 μm. As the hole diameter of the hole portion becomes larger than 10 μm, only the suspended fine particles having a large particle diameter can be collected, and the suspended fine particles that can be collected are limited. When the pore diameter is larger than 20 μm, the tendency becomes remarkable, which is not preferable.
The porosity of the porous film is 45% to 75%. As the open area ratio of the porous film becomes smaller than 45%, suspended fine particles having a particle diameter smaller than the pore diameter are caught or clogged, which is not preferable. As the open area ratio of the porous film becomes larger than 75%, the strength and durability as a filter are lacking, which is not preferable.
In addition, a glass fiber filter, a quartz fiber filter, etc. can be used as a backup filter, and a filter for collecting suspended particles can be formed by attaching one or more porous films on the upper surface thereof. As a method for adhering the glass fiber filter or the quartz fiber filter to the porous film or the porous films, thermocompression bonding, fusion, bonding with an adhesive, or the like is used.

  The porous membrane or the separation porous membrane is preferably formed in a band shape. Thus, for example, a pair of band-shaped porous membranes or separation porous membranes can be wound around a support shaft at both ends, and the support shaft can be rotated to send out a predetermined region, and an opening opened to a gas containing suspended fine particles It is possible to sequentially collect new suspended areas and collect suspended particles continuously, and to grasp temporal fluctuations of suspended particles. As a method for forming the belt, a belt-shaped substrate is used when creating a porous film, and a substrate in which a solution in which a polymer compound is dissolved in a hydrophobic organic solvent is fed, and high humidity air is used in the subsequent process. By using a continuous process of spraying and evaporating the hydrophobic organic solvent, it is possible to obtain a band-shaped filter for collecting floating particles. Alternatively, by adhering a rectangular or circular porous film to a support filter made of a band-shaped glass fiber filter or the like at equal intervals, a band-shaped floating particulate collection filter can be obtained.

  The filter for collecting suspended particulates according to claim 2 of the present invention is the filter according to claim 1, wherein the hole comprises a spherical or polygonal cavity having openings above and below, and the porous membrane comprises The spherical or polygonal cavity is formed into a shape filled with a close-packed structure.

With this configuration, in addition to the operation of the first aspect, the following operation is provided.
(1) It can be formed by casting a solution in which a polymer compound is dissolved in a hydrophobic organic solvent on a substrate, blowing high-humidity air, and evaporating the hydrophobic organic solvent.
(2) Since the hole is composed of a spherical or polygonal cavity having openings at the top and bottom, and the porous film is formed in a shape in which the cavity is filled with a close-packed structure, the porous film has a thickness direction. It is easy to cut at the middle part of the above, and can be easily cut and separated up and down.

  Here, by selecting the type of hydrophobic organic solvent as appropriate or by forming a porous film and then stretching it, the shape of the hole is not only spherical, but also polygonal, drum-shaped, barrel-shaped, etc. Can be formed.

  According to a third aspect of the present invention, there is provided a filter for collecting suspended particulates according to the second aspect of the present invention, comprising a separation porous membrane formed by cutting and separating the porous membrane in the thickness direction from top to bottom. doing.

With this configuration, in addition to the operation of the second aspect, the following operation is provided.
(1) Since it consists of a separation porous membrane formed by cutting and separating the porous membrane up and down, the thickness can be reduced, and even when used in a stacked manner, it can be used in a stacked manner without becoming thick. . By separating two or more separation porous membranes having different pore diameters, multi-stage classification can be performed, and two or more separation porous membranes having the same pore diameter are displaced and the center of each pore portion is shifted. Thus, suspended fine particles having a particle diameter smaller than the hole diameter of the hole can be captured.

  The filter for collecting suspended particulates according to claim 4 of the present invention is the filter according to any one of claims 1 to 3, wherein at least the inner periphery of the hole has a positive or negative polarity. It has the composition which has.

With this configuration, in addition to the operation of any one of claims 1 to 3, the following operation is provided.
(1) Since at least the inner periphery of the hole has a positive or negative polarity, the suspended fine particles having a particle size larger than the pore diameter are polarized to different polarities, or the suspended fine particles are polarized and adsorbed to the holes. It is possible to make it easier or to polarize suspended fine particles having a particle size smaller than the pore diameter to the same polarity to make it difficult to be caught around the pores, thereby improving classification accuracy.

  Here, as a method for imparting a positive or negative polarity to the surface of the porous membrane including the inner peripheral portion of the pore, the cationic polymer or the anionic polymer is dissolved in a solvent in which the filter for collecting suspended particles is not dissolved, For example, a method of dip-coating by immersing the filter 1 for collecting suspended fine particles in the solution, a method of using a polymer compound having a polar group as a polymer compound serving as a material for the porous film, and the like are used. In the former case, by appropriately selecting a cationic polymer or an anionic polymer, not only can polarity be imparted, but also hydrophilicity and hydrophobicity can be imparted.

  The filter for collecting suspended particulates according to claim 5 of the present invention is the filter according to any one of claims 1 to 4, wherein the porous membrane or the separated pores having different pore diameters are used. It has a configuration in which two or more films are formed to overlap each other.

With this configuration, in addition to the operation of any one of claims 1 to 4, the following operation is provided.
(1) Two or more porous membranes or separation porous membranes having different pore diameters are overlapped, and an upper porous membrane or separation porous membrane having a pore diameter of, for example, 10 μm is used, and a lower porous membrane or separation porous membrane is used. By using, for example, a 4 μm pore having a pore diameter smaller than that of the upper stage, floating particles having a particle diameter of 10 μm or more are classified and collected by the upper porous film, and the particle diameter of 4 μm or more is collected by the lower porous film. Airborne particles can be classified and collected, multistage classification can be performed, and particle size distribution can be measured.

  The filter for collecting suspended particulates according to claim 6 of the present invention is the invention according to any one of claims 1 to 4, wherein the porous membrane or the separation having the same hole diameter is used. The porous membrane has a configuration in which two or more porous membranes are overlapped while shifting the center of the hole.

With this configuration, in addition to the operation of any one of claims 1 to 4, the following operation is provided.
(1) Two or more porous membranes or separation porous membranes having the same pore diameter can be trapped by shifting the center of each pore, thereby trapping suspended fine particles having a particle size smaller than the pore diameter of the pore. By varying the degree of shifting appropriately, suspended fine particles having various particle sizes can be classified and collected.

  The suspended particulate collection method according to claim 7 of the present invention includes a setting step of setting the suspended particulate collection filter according to any one of claims 1 to 6 in an air passage, and suspended particulates. And a suction step for sucking gas into the air passage.

This configuration has the following effects.
(1) By passing a gas containing suspended fine particles in the suction process through a filter for collecting suspended particulates set in the air passage in the setting process, the suspended particulates are classified easily and quickly in a state where the suspended particulates are separated into the pores of the filter. And can be collected.

  Here, as a suction means in the suction process, a micro pump, a suction pump or the like disposed downstream of the air passage is used. In addition, by appropriately setting the suction flow rate and suction time of the air per unit time by the suction means, it is possible to calculate the amount of sucked gas, that is, the amount of gas that has passed through the filter, and this amount of gas and the number of trapped fine particles collected It is possible to measure the degree of air pollution and air pollutants at the collection site based on the type and type.

  The method for analyzing suspended particulates according to claim 8 of the present invention is such that a gas containing suspended particulates is passed through a predetermined region of the filter for collecting suspended particulates according to any one of claims 1 to 6. A particulate collection step for classifying and collecting the particles, an imaging step for imaging the predetermined area where the suspended particulates are collected, and a shape of the suspended particulates by performing image processing on the captured image captured in the imaging step And a fine particle measuring step for measuring a size, a property, or a relative position or distance between the suspended fine particles.

This configuration has the following effects.
(1) In the particulate collection step, the suspended particulates can be classified and collected easily and quickly in a state of being separated into the pores of the suspended particulate collection filter.
(2) In the imaging step, the image of the fine particles can be picked up by picking up an image of the area where the fine particles of the filter for collecting the fine particles are collected by the image pickup device.
(3) In the fine particle measurement process, the image data of the captured image captured in the imaging process is read from the imaging device to the image processing device, image processing is performed, and the shape, size, or relative relationship between the captured microparticle images Position, distance, or properties can be measured.
(4) Furthermore, the particle size distribution of airborne particles in the gas is performed by sequentially repeating the particle collection process and the captured image, and collecting the measurement values related to the shape and size of all the particle images formed in the captured image. Etc. can be obtained.

Here, after the particulate collection step, a filter feeding step is provided in which the region where the suspended particulates of the suspended particulate collection filter are collected is moved away from the air passage, and a new region without deposits is moved to the air passage. May be. As a result, after collecting the suspended fine particles in a certain region, the filter can be sent out to newly collect the suspended fine particles, and can be collected continuously.
It should be noted that the floating particles may be collected in a predetermined area of the filter for collecting the suspended particles in the particulate collection process, and the area may be imaged in the imaging process after the area is sent out in the filter feeding process. In addition, the operation of collecting suspended particulates in the particulate collection process and sending the suspended particulate collection filter in the filter feeding process is repeated a plurality of times, and the collection of suspended particulates is continuously performed in a plurality of regions. After collecting the suspended particles, a plurality of areas where the suspended particles are collected in the imaging step may be collectively imaged.

  According to a ninth aspect of the present invention, there is provided the method for analyzing suspended particulates according to the eighth aspect, wherein the predetermined area where the suspended particulates of the suspended particulate collecting filter are collected is defined as an adhesive surface of the transfer sheet. And a transfer step of transferring the suspended particulates collected and collected onto the adhesive surface.

With this configuration, in addition to the operation of the eighth aspect, the following operation is provided.
(1) A coloring reaction reagent or a luminescence reaction reagent is applied to a transfer sheet onto which the collected suspended particulates are transferred, thereby causing the suspended particulates to undergo a coloring reaction or a luminescence reaction with the component or a component contained therein. The properties such as pH of the suspended fine particles can be measured and the components can be specified by the luminescent color or its density.

Here, a synthetic resin film or the like is used as the transfer sheet.
As the color reaction reagent, a pH indicator, a chelating agent, or the like is used. As the pH indicator, thymol blue, bromophenol blue, bromocresol green or the like is used. As the chelating agent, diethyldithiocarbamate, dithizone and the like are used. Moreover, as a luminescent reaction reagent, luminol etc. which light-emit blue-green with respect to an alkaline solution are used. As the coloring reaction reagent or the luminescence reaction reagent, not only one that emits or emits light in the visible region, but also one that emits or emits light outside the visible region such as the ultraviolet region or X-rays can be used. In this case, it is preferable to measure by irradiating the transfer sheet on which the suspended fine particles have been transferred with ultraviolet light, X-rays or the like, and imaging with an imaging device or the like.

  According to a tenth aspect of the present invention, there is provided a suspended particulate collection device according to any one of the first to sixth aspects, wherein the casing has an opening and the inside of the casing is disposed so that a predetermined region is exposed from the opening. A pair of the suspended particulate collection filter according to any one of the above, and a pair of the particulate collection filters that are rotatably disposed opposite to the inside of the casing, and each end of the suspended particulate collection filter is wound around each. And a filter feed section that feeds a new predetermined area of the filter for collecting suspended particulates to the opening by rotating the support shaft.

This configuration has the following effects.
(1) In a predetermined region exposed from the opening of the filter for collecting suspended particles, the suspended particles can be classified and collected easily and quickly in a state where they are separated into the holes.
(2) The filter feed unit moves the area where the suspended particulates are collected from the filter and removes it from the opening, and a new area without deposits can be moved to the opening and exposed. The suspended fine particles can be collected and can be collected continuously.
(3) Since suspended particulates can be collected continuously, they can be collected easily and quickly at the site where suspended particulates are collected. In addition, after the continuous collection, the time and space distribution of the suspended fine particles can be accurately grasped by detailed analysis of the collected suspended fine particles in time series.

  Here, the filter feed section may be provided with a lever or the like for rotating the support shaft on the take-up side, and manually rotate the support shaft on the take-up side to send out a predetermined region of the filter for collecting suspended particles, or A predetermined area may be automatically sent out by providing a drive unit. In this case, a predetermined area may be sequentially sent out at predetermined time intervals by providing a control device and controlling the drive unit.

  The suspended particulate collection device according to an eleventh aspect of the present invention is the invention according to the tenth aspect, comprising an imaging device that captures an image of a predetermined area exposed at the opening of the suspended particulate collection filter. It has a configuration.

With this configuration, in addition to the operation of the tenth aspect, the following operation is provided.
(1) By capturing an image of an area where airborne particles of the airborne particle collecting filter are collected by an image pickup device, the image of the fine particle can be picked up, and image data of the picked up image is obtained from the image pickup device. The image can be read out to the processing device and image processing can be performed to measure the shape, size, or relative position, distance, or property of the captured particle image. Thereby, the shape, size, property, and distribution of the suspended fine particles can be immediately grasped and used as an atmospheric environment monitoring sensor.

  A CCD camera or the like is used as the imaging device. Note that it is preferable to magnify and image at an appropriate magnification using an optical microscope, an electron microscope, or the like in accordance with the size of the suspended fine particles to be collected and the resolution of the imaging device. An electronic image can also be taken using a scanning electron microscope.

  As described above, according to the suspended particle analysis method of the present invention and the suspended particle collection apparatus used therefor, the following advantageous effects can be obtained.

According to the invention of claim 1,
(1) Since the filter for collecting suspended particles is composed of a porous film having a large number of pores, the suspended particles can be individually captured in each of the holes and collected in a separated state. It is possible to provide a filter for collecting suspended particles that can be analyzed with high accuracy without reacting with other suspended particles or the like to change into a different compound.
(2) Since the hole diameter of the hole is 20 μm or less, preferably 0.1 μm to 10 μm, sea salt particles or yellow sand floating in a gas such as the atmosphere, metal oxide, sulfur oxide, pollen, It is possible to provide a filter for collecting suspended fine particles having excellent classification performance capable of accurately classifying and collecting suspended particulates such as dust and bacteria.
(3) Since the porosity of the porous film is 45% to 75%, it is possible to accurately classify and collect suspended fine particles while passing a gas such as air containing suspended fine particles. In addition, it is possible to provide a filter for collecting suspended particles that is less likely to be trapped or clogged by suspended particles having a particle diameter smaller than the pore diameter.
(4) By appropriately setting the hole diameter of the hole within a range of 20 μm or less, preferably 0.1 μm to 10 μm, it is possible to classify and collect various suspended particles according to their particle diameters. A collection filter can be provided.
(5) Since suspended particles are trapped in the holes formed regularly aligned with the porous film, it is easy to detect the holes supplemented with the suspended particles. For example, the number of blocked holes is counted. This makes it possible to quickly count the number of fine particles. In addition, it is possible to provide a filter for collecting suspended particles that can be accurately detected because the position of the trapped suspended particles coincides with the position of the hole, and that the probe can be easily positioned during detailed analysis.

According to invention of Claim 2, in addition to the effect of Claim 1,
(1) Since the hole is composed of a spherical or polygonal cavity having openings at the top and bottom, and the porous film is formed in a shape in which the cavity is filled with a close-packed structure, the porous film has a thickness direction. It is possible to provide a filter for collecting suspended particulates that can be easily cut at the middle part of the above and can be easily cut and separated in the vertical direction.

According to invention of Claim 3, in addition to the effect of Claim 2,
(1) Since it consists of a separation porous membrane formed by cutting and separating the porous membrane up and down, the thickness can be reduced, and even when used in a stacked manner, it can be used in a stacked manner without becoming thick. A filter for collecting suspended particles can be provided.

According to invention of Claim 4, in addition to the effect of any one of Claims 1 to 3,
(1) Since at least the inner periphery of the hole has a positive or negative polarity, the suspended fine particles having a particle size larger than the pore diameter are polarized to different polarities, or the suspended fine particles are polarized and adsorbed to the holes. It is possible to provide a filter for collecting suspended particles, which can be easily made, or the suspended particles having a particle diameter smaller than the pore diameter can be polarized with the same polarity so that the suspended particles are not easily caught around the pores.

According to the invention of claim 5, in addition to the effect of any one of claims 1 to 4,
(1) Two or more porous membranes or separation porous membranes having different pore diameters are overlapped, and an upper porous membrane or separation porous membrane having a pore diameter of, for example, 10 μm is used, and a lower porous membrane or separation porous membrane is used. By using, for example, a 4 μm pore having a pore diameter smaller than that of the upper stage, floating particles having a particle diameter of 10 μm or more are classified and collected by the upper porous film, and the particle diameter of 4 μm or more is collected by the lower porous film. It is possible to provide a filter for collecting suspended particulates that can classify and collect suspended particulates and has excellent classification performance that can perform multi-stage classification.

According to invention of Claim 6, in addition to the effect of any one of Claims 1 to 4,
(1) Two or more porous membranes or separation porous membranes having the same pore diameter can be trapped by shifting the center of each pore, thereby trapping suspended fine particles having a particle size smaller than the pore diameter of the pore. By appropriately varying the degree of shifting, it is possible to provide a filter for collecting suspended particles excellent in classification performance capable of classifying and collecting suspended particles having various particle diameters.

According to the invention of claim 7,
(1) By passing a gas containing suspended fine particles in the suction process through a filter for collecting suspended particulates set in the air passage in the setting process, the suspended particulates are classified easily and quickly in a state where the suspended particulates are separated into the pores of the filter. Thus, it is possible to provide a method for collecting suspended fine particles that can be collected.

According to the invention described in claim 8,
(1) In the particulate collection process, the suspended particulates are separated and collected in the holes of the suspended particulate collection filter in a simple and quick manner, and the suspended particulates in the suspended particulate collection filter are collected in the imaging process. By capturing an image of the collected area with an imaging device, the particle image can be captured, and image data of the captured image captured in the imaging step in the particulate measurement process is read from the imaging device to the image processing device. Since it is possible to measure the shape, size, or relative position, distance, or nature of the captured microparticle images, the suspended particles collected as before can be collected in a solvent. The process of dispersing is unnecessary and excellent in labor savings, and the suspended particulates do not react with other suspended particulates and change into different compounds, enabling highly accurate analysis. It is possible to provide a 遊微 particle analysis method.

According to the invention of claim 9, in addition to the effect of claim 8,
(1) A coloring reaction reagent or a luminescence reaction reagent is applied to a transfer sheet onto which the collected suspended particulates are transferred, thereby causing the suspended particulates to undergo a coloring reaction or a luminescence reaction with the component or a component contained therein. It is possible to provide a suspended particulate analysis method excellent in analytical performance capable of measuring properties such as pH of suspended particulates and specifying their components by the luminescent color or the density thereof.

According to the invention of claim 10,
(1) In a predetermined region exposed from the opening of the filter for collecting suspended particulates, the suspended particulates can be easily and quickly classified and collected while being separated into holes, and the suspended particulates are collected by the filter feed section. The area where the suspended particulates of the collection filter are collected can be moved and removed from the opening, and a new area with no deposits can be moved to the opening to be exposed. Can be continuously collected, and suspended particulates can be collected continuously, so that the suspended particulate collection device can easily and quickly collect suspended particulates at the site where they are collected. Can be provided.
(2) It is possible to provide a suspended particulate collection device capable of accurately grasping the temporal and spatial distribution of suspended particulates by analyzing the collected suspended particulates in time series in detail after continuous collection.

According to the invention of claim 11, in addition to the effect of claim 10,
(1) By capturing an image of an area where airborne particles of the airborne particle collecting filter are collected by an image pickup device, the image of the fine particle can be picked up, and image data of the picked up image is obtained from the image pickup device. The image can be read out to the processing device and processed to measure the shape, size, or relative position, distance, or properties of the captured microparticle images and collected from the measured properties. It is possible to provide a suspended particulate collection device that can identify the suspended particulate.
(2) It is possible to provide a suspended particulate collection device that can immediately grasp the shape, size, property, and distribution of suspended particulates and can be used as a sensor for atmospheric environment monitoring.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 is a plan view of the suspended particulate collection filter according to the first embodiment, and FIG. 2 is a partially broken perspective view of the suspended particulate collection filter according to the first embodiment. FIG. 3A is a perspective view of a main part for explaining the separation and separation of the filter for collecting suspended particulates according to the first embodiment, and FIG. 3B is a perspective view of the relevant part of the filter for capturing particulate suspended and cut up and down. It is.
In the figure, reference numeral 1 is a filter for collecting floating particles made of a porous film formed in a band shape, 2 is a hole formed over the entire surface of the filter 1 for collecting floating particles, and 3 is a filter 1 for collecting floating particles. The cutting lines 4a and 4b are formed by cutting and separating vertically, and X is a floating particulate.
Here, as shown in FIG. 2, the hole 2 is composed of a drum-like or barrel-like cavity having circular openings on the top and bottom. Further, the hole 2 is formed in the airtight particle collecting filter 1 in a close-packed manner over the entire surface. That is, the holes 2 are not in contact with each other on the upper and lower surfaces of the suspended particulate collection filter 1, but the holes 2 are substantially in contact with each other in the middle portion in the thickness direction of the suspended particulate collection filter 1. Is formed.
In addition, a glass fiber filter, a quartz fiber filter, etc. can also be stuck as a backup filter on the lower surface of the filter 1 for collecting floating particulates, and the strength of the filter can be increased.

An example of a method for creating the suspended particulate collection filter 1 according to the first embodiment configured as described above will be described below.
Hydrophobic organic solvent solution (polymer concentration is 0.1 to 2 wt%) in which a polymer compound soluble in a hydrophobic organic solvent and an amphiphilic polymer compound are mixed at a predetermined ratio, glass substrate, ceramic substrate, etc. The substrate is cast (cast) and sprayed with high-humidity air to evaporate the hydrophobic organic solvent. Here, since the hydrophobic organic solvent takes away the latent heat of the hydrophobic organic solvent solution cast when it evaporates, the temperature of the solution surface decreases, and minute water droplets aggregate and adhere to the solution surface. The water droplets adhere to the surface of the solution in a close-packed state, and form a hollow portion penetrating vertically in the cast solution. After all of the hydrophobic organic solvent is evaporated and the polymer compound is solidified, the water droplets are evaporated to form the hole 2 in the portion where the droplets are attached. In this manner, the suspended particulate collection filter 1 having a thickness of 0.1 μm to 20 μm, a hole diameter of the hole 2 of 0.1 μm to 10 μm, and an open area ratio of 45% to 75% is produced.
Here, examples of the hydrophobic organic solvent include aromatic hydrocarbons such as benzene, toluene, and p-xylene, halogenated aromatic hydrocarbons such as monochlorobenzene, o-dichlorobenzene, and trichlorobenzene, chloroform, carbon tetrachloride, and chloride. Halogenated aliphatic hydrocarbons such as methylene, trichlorethylene, and perchloroethylene, and aliphatic hydrocarbons such as pentane, hexane, heptane, and octane are used.
Polymer compounds soluble in hydrophobic organic solvents include general-purpose polymers such as polystyrene, polymethyl methacrylate, and polybutyl methacrylate, engineering plastics such as polysulfone and polycarbonate, polyion complexes, and thermoplastic elastomers (for example, 1, 4 -Butadiene polymer, etc.), polylactic acid, polyhydroxybutyric acid, glycolic acid-lactic acid copolymer, biodegradable polymers such as poly-ε-caprolactone, polyimide having heat resistance and chemical resistance, and the like are used.
As the amphiphilic polymer compound, amphiphilic polyacrylamide or the like is used. As a mixing ratio of the polymer compound and the amphiphilic polymer compound, a weight ratio of, for example, 5: 1 to 20: 1 is used.
Further, 30% to 80% is used as the relative humidity of the high humidity air. It should be noted that the humidity is sufficient as long as moisture in the air can be condensed on the solution surface, and not limited to air, an inert gas such as nitrogen or argon may be used. Moreover, as atmospheric temperature at the time of blowing high humidity air, what is necessary is just the temperature which a hydrophobic organic solvent evaporates, and 5-80 degreeC is used.
The hole diameter of the hole 2 changes the concentration of the hydrophobic organic solvent solution of the polymer compound, the amount of the solution cast on the substrate, the type of the hydrophobic organic solvent, the relative humidity of the high-humidity air to be blown, the temperature, and the flow rate. Accordingly, the thickness can be appropriately set within a range of 20 μm or less, preferably within a range of 0.1 μm to 10 μm. For example, by increasing the relative humidity of the high-humidity air, droplets condensed on the solution surface can easily grow, so that the hole diameter of the hole 2 can be increased.
A positive or negative polarity can be imparted to the surface of the suspended particulate collection filter 1 including the inner periphery of the hole 2. In this case, a cationic polymer or an anionic polymer is dissolved in a solvent in which the suspended particulate collection filter 1 is not dissolved, and the suspended particulate collection filter 1 is immersed in the solution and dip-coated, so that the surface is positive or negative. Negative polarity can be imparted. As a result, the suspended fine particles X having a particle diameter larger than the pore diameter are polarized to have different polarities so as to be easily adsorbed to the pores 2, or the suspended fine particles X having a particle diameter smaller than the pore diameter are polarized to the same polarity. It is possible to make it difficult to get caught around and improve the classification accuracy. Note that poly (L-lysine) or the like is used as the cationic polymer, and sodium polysulfonate or the like is used as the anionic polymer. In the first embodiment, the suspended particulate collection filter 1 is immersed in a 50 mg / L aqueous solution of poly (L-lysine) for 10 minutes, pulled up, and then washed twice to impart polarity to the surface. The suspended particulate collection filter 1 was prepared.

  Further, as shown in FIG. 3 (a), the prepared suspended particulate collection filter 1 is cut and separated at the cutting line 3 in the middle in the thickness direction, and as shown in FIG. It can also be set as the filter 4a, 4b for collection of floating particulates which consists of a separation porous membrane cut and separated up and down. In addition, in the middle part in the thickness direction of the filter 1 for collecting suspended particulates, the adjacent holes 2 are substantially in contact with each other, so that the thickness of the polymer compound between the adjacent holes 2 is extremely thin and easy. Can be cut. Thereby, the filter 4a, 4b for collecting suspended particulates having a small thickness can be obtained.

Next, a method for collecting suspended particles using the suspended particulate collection filter 1 or the suspended particulate collection filters 4a and 4b will be described.
First, the suspended particulate collection filter 1 is set in an air passage open to a gas containing suspended particulates X (set process). Here, the suspended particulate collection filter 1 is disposed so as to cover, for example, an opening of the air passage. Next, the gas containing the suspended fine particles X is sucked into the air passage by the suction pump disposed in the lower part of the air passage, and the gas is passed through the suspended particulate collecting filter 1 (suction process). Thereby, the floating fine particles X having a particle diameter larger than the hole diameter of the hole 2 of the filter 1 for collecting floating particles are separated and captured in each hole 2 individually. The suspended fine particles X having a particle diameter smaller than the hole diameter of the hole 2 pass through the hole 2 and are discharged from the suction pump to the outside air. In the first embodiment, the exposed portion in the air passage of the filter 1 for collecting suspended particulates has a circular shape with a diameter of 16 mm, and the suction flow rate by the suction pump is about 100 L / h to 1000 L / h. The suction time is preferably set as appropriate depending on the number of suspended fine particles X in the gas. For example, when collecting in a factory premises where there is a large amount of suspended particulate X, that is, the degree of air pollution is large, the suction time is set short, and 2 or more in one hole 2 of the suspended particulate collecting filter 1 It is preferable to prevent the suspended fine particles X from being trapped or clogged.

As described above, the suspended particulate collection filter 1 and the suspended particulate collection method according to Embodiment 1 are configured, and thus have the following effects.
(1) Since the filter 1 for collecting floating particulates is composed of a porous film having a large number of pores 2, the suspended particulates X can be individually captured in each pore and collected in a separated state.
(2) Since the hole diameter of the hole 2 is 2 μm to 20 μm, preferably 4 μm to 10 μm, sea salt particles or yellow sand floating in a gas such as the atmosphere, metal oxide, sulfur oxide, pollen, It is possible to accurately classify and collect airborne particles such as dust and bacteria.
(3) The suspended particulate collection filter 1 is formed so as to have a porosity of 45% to 65%. Therefore, the suspended particulate X can be accurately detected while passing a gas such as the atmosphere containing the suspended particulate X. The particles can be classified and collected, and the suspended fine particles X having a particle diameter smaller than the pore diameter are hardly caught or clogged.
(4) By appropriately setting the hole diameter of the hole 2 within the range of 2 μm to 20 μm, preferably 4 μm to 10 μm, various suspended fine particles can be classified and collected for each particle diameter.
(5) The suspended particulate collection filter 1 is formed in a shape in which the hole portion 2 is formed of a spherical cavity portion having upper and lower openings, and the cavity portion is filled with a close-packed structure. It is easy to cut at the middle part in the vertical direction, can be cut and separated easily up and down, the thickness can be made thin, and it can be used by overlapping and not overlapping to be used. .
(6) By passing the gas containing the floating fine particles X in the suction step through the filter 1 for collecting floating fine particles set in the air passage in the setting step, the floating fine particles X are passed through the holes 2 of the filter 1 for collecting the fine floating particles. Each separated state can be easily and quickly classified and collected.
(7) Since the suspended fine particles X are trapped in the holes 2 that are regularly arranged, the holes 2 supplemented with the suspended fine particles X can be easily detected. By counting, the number of particles X can be quickly counted. In addition, since the position of the trapped suspended particulate X coincides with the position of the hole 2, it can be detected accurately, and the probe can be easily positioned during the detailed analysis.

(Embodiment 2)
FIG. 4 is a perspective view of the main part of the filter for collecting suspended particulates according to the second embodiment.
In FIG. 4, 1a is a filter for collecting suspended particles, 1b is a filter for collecting suspended particles disposed below the filter for collecting suspended particles 1a, 2a is a hole portion of the filter for collecting suspended particles 1a, 2b Is the hole of the filter 1b for collecting suspended particles, and X and Y are suspended particles.
The suspended particulate collection filters 1a and 1b are produced by the production method described in the first embodiment. The hole diameter of the hole 2a is 10 μm, and the hole diameter of the hole 2b is 4 μm. . As the suspended particulate collection filters 1a and 1b, the filter composed of the separation porous membrane described in the first embodiment can be used.
The suspended particulate collection method using the suspended particulate collection filters 1a and 1b in the second embodiment is the same as that described in the first embodiment, and a description thereof will be omitted.

As described above, since the suspended particulate collection filters 1a and 1b in the second embodiment are configured, in addition to the operations in the first embodiment, the following operations are provided.
(1) By using a filter having a pore diameter of 10 μm as the upper-stage floating particulate collection filter 1a and using a filter having a pore diameter of 4 μm smaller than the upper stage as the lower-stage suspended particulate collection filter 1b. The floating particulate collection filter 1a in the upper stage classifies and collects the suspended particulate X having a particle size of 10 μm or more, and the floating particulate collection unit 1b in the lower stage classifies the floating particulate Y having a particle diameter of 4 μm to 10 μm. Can be collected and classified in multiple stages.

(Embodiment 3)
FIG. 5 is a plan view of the main part of the filter for collecting suspended particulates according to the third embodiment.
In FIG. 5, 1c is a filter for collecting suspended particles, 1d is a filter for collecting suspended particles superimposed on the lower part of the filter for collecting suspended particles 1c, 2c is a hole portion of the filter for collecting suspended particles 1c, 2d Is a hole of the filter 1d for collecting suspended particles.
The suspended particulate collection filters 1c and 1d are produced by the production method described in the first embodiment, and the hole diameter of the hole 2c and the hole diameter of the hole 2d are formed to be the same.
The suspended particulate collection filter 1c and the suspended particulate collection filter 1d are overlapped with the center of the hole 2c shifted from the center of the hole 2d. In addition, it is preferable to use what consists of the separation porous membrane demonstrated in Embodiment 1 as the filter 1c and 1d for collection of floating particulates. As a result, the suspended particulate collection filters 1c and 1d can be formed thin, so that they can be classified with high accuracy even when they are overlapped.
In order to prevent channeling, the suspended particulate collection filter 1c and the suspended particulate collection filter 1d are thermocompression bonded, fused, or arranged so that the interval is smaller than the suspended particulate collection. Is done.

As described above, since the suspended particulate collection filters 1a and 1b in the second embodiment are configured, in addition to the operations in the first embodiment, the following operations are provided.
(1) Particles smaller than the hole diameters of the holes 2c and 2d are obtained by overlapping the suspended particle collection filters 1c and 1d having the same hole diameters of the holes 2c and 2d while shifting the centers of the holes 2c and 2d. Suspended fine particles of various diameters can be classified and collected by appropriately varying the degree of shifting the center.

(Embodiment 4)
FIG. 6 is a schematic internal perspective view of the suspended particulate collection device according to the fourth embodiment.
In FIG. 6, 10 is a suspended particulate collection device, 11 is a casing of the suspended particulate collection device 10 formed in a rectangular parallelepiped shape, 12 is an opening opening in a rectangular shape at the center of the upper surface of the casing 11, Reference numeral 13 denotes a belt-like suspended particulate collection filter disposed on the inside of the casing 11 with one end and the other end wound around a winding-side support shaft and a feed-side support shaft, respectively, and 14a is a casing. 11 is a winding-side support shaft that is disposed inside 11 so as to be freely wound and wound around one end of the filter 13 for collecting suspended particulates, and 14b is turned inside the housing 11 so as to face the winding-side support shaft 14a. A feed-side support shaft 14c that is freely disposed and on which the other end of the suspended particulate collection filter 13 is wound, 14c has a take-up-side support shaft 14a and a feed-side support shaft 14b, and the take-up-side support shaft 14a. The filter 13 for collecting suspended particles in the opening 12 by rotating the A filter feed section for feeding out a predetermined area, 15 is a suction means such as a small fan disposed in the lower part of the opening 12, 16 is an exhaust port formed in the lower surface of the housing 11, and 20 is obliquely above the opening 12. An imaging device that images a predetermined region of the filter 13 for collecting the suspended particulates exposed from the opening 12, 21 is a drive unit such as a motor that rotationally drives the winding-side support shaft 14 a, and 22 is imaged by the imaging device 20. A control device that performs image processing of a captured image and control of the drive unit 21, X is floating particulates.

Here, the filter 13 for collecting suspended particulates was prepared by the same method as that described in the first embodiment.
The filter feeding unit 14c may be provided with a lever or the like that rotates the winding-side support shaft 14a and manually rotates the winding-side support shaft 14a to feed a predetermined region of the particulate collection surface 13a. A predetermined region of the particulate collection surface 13a may be automatically sent out. In this case, the control unit 22 may control the drive unit 21 to sequentially send out a predetermined region of the suspended particulate collection filter 13 at a predetermined time interval.
As the suction means 15, a small fan, a micro pump, or the like is used.

With respect to the suspended particulate analysis method using the suspended particulate collection apparatus 10 configured as described above, each step will be described below with reference to the drawings.
First, the region where no adhering matter of the suspended particulate collection filter 13 is exposed is exposed from the opening 12 by rotating the winding support shaft 14a of the suspended particulate collection device 10 in the winding direction. Then, the gas containing the suspended fine particles X, which is the measurement object, is sucked, and the suspended fine particles X are adsorbed and collected by the suspended fine particle collecting filter 13 (fine particle collecting step). The suction of the gas to the filter 13 for collecting the suspended particulates can be performed by sucking the gas from the opening 12 and exhausting it from the exhaust port 16 using the suction means 15. When the number of suspended particulates X in the gas to be sucked is extremely large, a shutter or the like attached to the opening 12 so as to be freely opened and closed is provided, and the suspended particulate collecting filter 13 is placed in a predetermined area by the filter feeding section 14c. It is preferable that the suspended particulate collection filter 13 does not suck the gas when the length is sent.

Next, the predetermined region of the filter 13 for collecting the floating particles X in which the suspended particles X are collected in the particulate collection process, for example, by rotating the winding side support shaft 14a of the suspended particulate collection device 10 in the winding direction. While moving to the winding-side support shaft 14a side, a new area free from deposits is exposed in the opening 12 (filter feeding step). The suspended particulate collection filter 13 is sent until at least a predetermined area where the suspended particulate X is collected is removed from the opening 12.
In addition, after exposing the predetermined area | region of the filter 13 for collection of floating particulates to the opening part 12 for a predetermined period of time, the predetermined area | region where the suspended particulate was collected by the imaging device 20 is imaged (imaging process), and the filter sending part 14c after that. May be used to send out the suspended particulate collection filter 13. In the imaging step, it is preferable to magnify the image with a suitable magnification using an optical microscope, an electron microscope, or the like according to the size of the collected suspended fine particles X and the resolution of the imaging device.
The captured image is read from the imaging device 20 to the control device 22 as image data. The control device 22 performs image processing on the read image data, and measures the shape, size, or relative position, distance, or property of the captured particle image (particle measurement step). In the image processing performed here, after adjusting the gradation of the image, the image is converted into a binarized image, and separation and number counting of individual fine particle images of individual floating particles X are performed by various binarization processes. Determination of the center position of the suspended fine particle X, measurement of the area, fine particle long diameter and short diameter by measurement of the fine particle image, distinction of the shape by these measurement results, and the like are performed.
In addition, a high-speed electron beam is irradiated to the region where the suspended particulate X of the suspended particulate collection filter 13 is collected using an X-ray microanalyzer, and the intensity of the characteristic X-rays detected at each analysis point is converted into a digital signal. Can be recorded corresponding to the XY coordinates, and the element (or composition) distribution in the plane direction can be output as a mapping image.

  Further, after collecting the suspended fine particles X in a predetermined region of the suspended particulate collecting filter 13, the adhesive surface of a transfer sheet (not shown) is brought into contact with the region, and the suspended particulate X is transferred to the transfer sheet. It is also possible to perform imaging, measurement, and analysis of the suspended fine particles X using the transfer sheet. Furthermore, by applying a coloring reaction reagent or a luminescence reaction reagent to the transfer sheet on which the suspended particles X are transferred from the filter 13 for collecting the suspended particles, the floating particles X are subjected to a color reaction or light emission by the components or components contained therein. By reacting, the properties such as pH of the suspended fine particles can be measured and the components can be specified by the color, light emission color, lightness or the like. In addition, as an adhesive surface of the transfer sheet, one applied with an adhesive such as polyvinyl alcohol is used.

As described above, the suspended particulate analysis method and suspended particulate collection apparatus 10 according to the fourth embodiment are configured, and thus have the following effects.
(1) In the particulate collection process, the suspended particulate X can be easily and quickly classified and collected in the state where the suspended particulate X is separated into the holes 2 of the suspended particulate collection filter 13. By capturing an area of the collection filter 13 where the suspended particulates are collected by the imaging device 20, the particulate image can be captured, and image data of the captured image is transferred from the imaging device 20 to the control device 22. It is possible to read out and perform image processing to measure the shape and size of the captured fine particle image, or the relative position, distance, or property between the fine particle images.
(2) In the filter feeding step, the area where the suspended particulate X of the suspended particulate collecting filter 13 is collected by the filter feeding section 14c is moved to be removed from the opening 12, and a new area free from adhering matter is formed in the opening 12. It can be moved and exposed, the suspended particulate X can be newly collected, and can be collected continuously. In addition, since the suspended fine particles X can be continuously collected, the suspended fine particles X can be easily and quickly collected at the site where the suspended fine particles X are collected.
(3) A coloring reaction reagent or a luminescence reaction reagent is applied to the transfer sheet onto which the collected suspended particulates are transferred, thereby causing the suspended particulates to undergo a coloring reaction or a luminescence reaction with the component or a component contained therein. The properties such as pH of the suspended fine particles can be measured and the components can be specified by the luminescent color or its density.

Next, examples of the present invention will be described. However, the present invention is not limited to these examples.
(Example 1)
A chloroform solution (0.1-2 wt% as the polymer concentration) in which poly-ε-caprolactone having an average molecular weight of 70,000 to 100,000 and amphiphilic polyacrylamide are mixed at a weight ratio of 10: 1 is used for a glass substrate or Casting 8 mL onto a substrate such as a ceramic substrate, blowing high-humidity air with a relative humidity of 30% to 80% at a flow rate of 1 to 20 L / min, and evaporating chloroform to a thickness of 0.1 μm A filter 1 for collecting suspended particles having a diameter of ˜20 μm, a hole diameter of 10 μm, and a hole area ratio of 45% to 65% was obtained. This airborne particle collecting filter 1 adhered and fixed on a glass fiber filter was set in a circular air passage having a cross section of 16 mm in diameter, and air was sucked into the air passage at a suction flow rate of 1000 L / h for 2 h. A suction pump was used as the suction means. The suspended fine particles X collected after the suction were imaged using a scanning electron microscope to obtain a fine particle image as shown in FIG. FIG. 7 is a fine particle image of the suspended fine particles X in Example 1.
From FIG. 7, it was found that airborne particulate X having a particle diameter of 10 μm or more can be classified and collected by the suspended particulate collection filter 1 having a pore diameter of 10 μm.
(Example 2)
In the same manner as in Example 1, a suspended particulate collection filter 1 with a pore size of 10 μm was obtained, and the pore size of the pores was the same as in Example 1 except that 5 mL of the solution was cast. Obtained a filter for collecting suspended fine particles of 4 μm. This airborne particle collecting filter 1 is a circular wind having a cross section of 16 mm in diameter, which is affixed to the upper surface of a glass fiber filter with a pore diameter of 10 μm on the top and a pore diameter of 4 μm on the bottom. The air was sucked into the air passage at a suction flow rate of 1000 L / h for 2 hours. A suction pump was used as the suction means. The suspended fine particles X collected after the suction were imaged using a scanning electron microscope to obtain a fine particle image shown in FIG. FIG. 8 is a fine particle image of the suspended fine particles X in Example 2.
From FIG. 8, airborne particulate X having a particle diameter of 10 μm or more can be classified and collected by the suspended particulate collection filter 1 having a pore diameter of 10 μm, and the suspended particulate having a pore diameter of 4 μm. It was found that airborne fine particles having a particle diameter of 4 μm to 10 μm can be classified and collected by the collection filter.
In addition, the area where suspended particulates are collected is imaged and image processed using an electrolytic emission scanning electron microscope (FE-SEM) and an X-ray microanalyzer to identify NaCl, metal oxides, sulfur compounds, etc. Can do. An example is a mapping image of sulfur element by characteristic X-ray analysis. FIG. 9 is a mapping image of sulfur element by characteristic X-ray analysis. From FIG. 9, it was found that the suspended fine particles of 4 μm to 10 μm captured in the suspended fine particle collecting sheet having a pore diameter of 4 μm in the lower stage in Example 2 are sulfur compounds.

As described above, the present invention easily collects solid or liquid suspended fine particles floating in the atmosphere and the like, the individual shape and size of the collected suspended fine particles, and the relative position between the suspended fine particles. In particular, according to the present invention, each of the suspended particulates can be measured by a filter for collecting suspended particulates and a suspended particulate collecting method, a suspended particulate collection method, and a suspended particulate collection and analysis apparatus using the same. It is possible to provide a filter for collecting suspended fine particles that can be classified and collected easily and quickly in a separated state.
In addition, according to the present invention, it is possible to provide a method for collecting suspended fine particles that can be classified and collected easily and quickly in a state where the suspended fine particles are separated from each other.
Furthermore, according to the present invention, it is possible to easily and quickly classify and collect suspended particulates at a site where suspended particulates are collected, and the individual sizes, shapes, properties, or relative relationships between individual particulates. It is possible to provide a suspended particle analysis method capable of accurately measuring a position, a distance between particles, and the like.
In addition, according to the present invention, the floating particulate collection that can easily and quickly classify and collect the suspended particulates at the site where the suspended particulates are collected and can continuously collect the suspended particulates. An apparatus can be provided.

Plan view of filter for collecting suspended particulates in Embodiment 1 FIG. 3 is a perspective view of a partially broken main part of the filter for collecting suspended particulates in the first embodiment. (A) Perspective view of relevant part for explaining cutting and separation of filter for collecting suspended particulates according to Embodiment 1 (b) Perspective view of relevant part of filter for collecting suspended particulates separated vertically The perspective view of the principal part of the filter for collection of suspended particulates in the second embodiment Plan view of relevant parts of filter for collecting suspended particulates in Embodiment 3 Internal perspective schematic diagram of suspended particulate collection device according to Embodiment 4 Fine particle image of suspended fine particles in Example 1 Fine particle image of suspended fine particles in Example 2 Mapping image of sulfur element by characteristic X-ray analysis

Explanation of symbols

1, 1a, 1b, 1c, 1d Floating particulate collection filter 2, 2a, 2b, 2c, 2d Hole 3 Cutting line 4a, 4b Floating particulate collection filter 10 Floating particulate collection device 11 Housing 12 Opening DESCRIPTION OF SYMBOLS 13 Floating particulate collection filter 14a Winding side support shaft 14b Feeding side support shaft 14c Filter feed portion 15 Suction means 16 Exhaust port portion 20 Imaging device 21 Drive portion 22 Control device X, Y Floating particulate

Claims (11)

  It consists of a porous membrane having a thickness of 0.1 μm to 20 μm having a large number of pores formed of a polymer compound dissolved in a hydrophobic organic solvent, and the pore diameter of the pores is 20 μm or less, preferably 0.1 μm to 10 μm. The filter for collecting suspended fine particles, wherein the porosity of the porous membrane is 45% to 75%.   The hole is formed of a spherical or polygonal cavity having openings at the top and bottom, and the porous film is formed in a shape in which the spherical or polygonal cavity is filled with a close-packed structure. The filter for collecting particulate matter according to claim 1.   The filter for collecting suspended particulates according to claim 2, comprising a separated porous membrane formed by cutting and separating the porous membrane in the thickness direction from top to bottom.   The suspended particulate collection filter according to any one of claims 1 to 3, wherein at least an inner peripheral portion of the hole portion has a positive or negative polarity.   5. The collection of suspended fine particles according to claim 1, wherein two or a plurality of the porous membranes or the separation porous membranes having different pore diameters of the pores are formed to overlap each other. filter.   The porous membrane or the separation porous membrane having the same pore diameter of the pores is formed by overlapping two or more of the pores while shifting the center of the pores. The filter for collection of suspended particulates according to Item.   A setting process for setting the filter for collecting suspended particulates according to any one of claims 1 to 6 in an air path, and a suction process for attracting a gas containing suspended particulates to the air path. A method for collecting suspended particulates characterized by the above. A particulate collection step of passing a gas containing suspended particulates through a predetermined region of the suspended particulate collection filter according to any one of claims 1 to 6 to classify and collect the suspended particulates;
An imaging step of imaging the predetermined area where the suspended particulates are collected;
A fine particle measurement step for measuring the shape, size, and properties of the floating fine particles, or the relative position or distance between the floating fine particles by performing image processing on the captured image captured in the imaging step;
A method for analyzing suspended particulates, comprising:   A transfer step of transferring the floating particles collected by superimposing and collecting the predetermined area where the floating particles of the filter for collecting the floating particles are collected on the adhesive surface of the transfer sheet to the adhesive surface; The method for analyzing suspended particulates according to claim 8, wherein: A housing having an opening;
The suspended particulate collection filter according to any one of claims 1 to 6, wherein the filter is disposed inside the housing so that a predetermined region is exposed from the opening.
There is a pair of support shafts that are rotatably arranged opposite to the inside of the housing and on which both ends of the filter for collecting suspended particulates are respectively wound, and the openings are formed by rotating the support shafts. A filter feed unit that sends out a new predetermined area of the filter for collecting suspended particulates to the unit;
A suspended particulate collection device characterized by comprising: The floating particle collecting apparatus according to claim 10, further comprising an imaging device that images a predetermined area exposed at the opening of the filter for collecting floating particles.