CN112144127B - A preparation device for multi-layer microstructured fibers based on near-field electrospinning direct writing - Google Patents
A preparation device for multi-layer microstructured fibers based on near-field electrospinning direct writing Download PDFInfo
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- CN112144127B CN112144127B CN202011122974.9A CN202011122974A CN112144127B CN 112144127 B CN112144127 B CN 112144127B CN 202011122974 A CN202011122974 A CN 202011122974A CN 112144127 B CN112144127 B CN 112144127B
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0092—Electro-spinning characterised by the electro-spinning apparatus characterised by the electrical field, e.g. combined with a magnetic fields, using biased or alternating fields
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- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Nonwoven Fabrics (AREA)
Abstract
The invention relates to the field of electrospinning micro-nano manufacturing, in particular to a preparation device of multilayer microstructure fiber based on near field electrospinning direct writing, which comprises an injection pump, an injection needle tube, an electrospinning needle head, a high-voltage power supply, a collecting plate, a displacement control platform, a focusing irradiation light source, a sheath gas device and a focusing heating light source, wherein the injection pump is used for conveying a solution in the injection needle tube to the electrospinning needle head, the collecting plate is positioned below the electrospinning needle head, the displacement control platform is used for driving the collecting plate to move, the collecting plate comprises photosensitive collecting units distributed in an array and an insulating medium, wherein the insulating medium is filled between adjacent photosensitive collecting units, a focusing irradiation light source is focused on the photosensitive collecting units below the electrospinning needle head, and a high-voltage power supply is used for providing an electric field between the electrospinning needle head and the photosensitive collecting units.
Description
Technical Field
The invention relates to the field of electrospinning micro-nano manufacturing, in particular to a device for preparing multilayer microstructure fibers based on near-field electrospinning direct writing.
Background
In recent years, the improvement of the microstructure integration level of an electronic sensor and the reduction of the sensor volume are mainstream of the development of micro-nano electronic sensors, and in the micro-nano sensor preparation process, the traditional process is based on exposure and etching and is reduced into a manufacturing process technology, so that the problems of poor material compatibility, high cost, serious environmental pollution and the like are faced, and the requirements of low-cost and green manufacturing of the micro-nano electronic sensors cannot be met. The micro-nano electronic sensor microstructure preparation is carried out by a spray printing additive manufacturing mode, and has the advantages of good material compatibility, simple process, low cost, environment friendliness and the like, and has a wide application prospect. Currently, researchers develop various micro-nano electronic spray printing preparation processes, such as integrated spray printing of a constant film field effect transistor on a flexible substrate, so as to maintain good electrical performance, but the line width and the size of a functional device are still to be further reduced so as to improve the detection information density; the ink-jet printing of the multilayer transparent electronic circuit is completed by combining the nanoparticle ink and the organic flexible substrate by scientific researchers, the feasibility of the multilayer electronic skin ink-jet printing is verified, but the structural matching among the multilayer circuits cannot be completed. Therefore, a novel spray printing technology is needed in the field of micro-nano electronic sensor element preparation, the problems of poor spray printing preparation precision and difficult three-dimensional forming are solved, and the three-dimensional forming of the multi-layer composite high-sensor-density micro-nano electronic sensor is realized.
Disclosure of Invention
Therefore, a preparation device of multilayer microstructure fiber based on near-field electrospinning direct writing needs to be provided, and the problems that the traditional micro-nano jet printing preparation technology is poor in precision and cannot be formed in a three-dimensional mode are solved.
In order to achieve the above object, the present invention provides a device for preparing a multilayer microstructure fiber based on near field electrospinning direct writing, which is characterized in that: the device comprises an injection pump, an injection needle tube, an electrospinning needle head, a high-voltage power supply, a collecting plate, a displacement control platform, a focusing irradiation light source, a sheath gas device and a focusing heating light source, wherein the injection needle tube is arranged on the injection pump, the injection needle tube is connected with the electrospinning needle head through a guide tube, the injection pump conveys a solution in the injection needle tube to the electrospinning needle head, the collecting plate is positioned below the electrospinning needle head, the displacement control platform drives the collecting plate to move, the collecting plate comprises photosensitive collecting units and insulating media distributed in an array, the insulating media are filled between adjacent photosensitive collecting units, the focusing irradiation light source focuses and irradiates the photosensitive collecting units below the electrospinning needle head, the high-voltage power supply is connected with the electrospinning needle head and the photosensitive collecting units, the high-voltage power supply is used for providing an electric field between the electrospinning needle head and the photosensitive collecting units, the sheath gas device is communicated with the electrospinning needle head, and the focusing heating light source focuses on the position on the collecting plate corresponding to the electrospinning needle head.
Further, the photosensitive collecting unit comprises a conductive receiving block and a photoresistor, the conductive receiving block is connected with the high-voltage power supply through the photoresistor, and the focusing illumination light source focuses and illuminates the photoresistor connected with the conductive receiving block below the electrospinning needle. When the conductive receiving block moves to the lower part of the electrospinning needle head, the connected photoresistor is influenced by the focusing irradiation light source, the resistance value is reduced to zero, the connecting wire is connected with the cathode of the high-voltage power supply, and an electric field is formed between the conductive receiving block and the electrospinning needle head, so that spray printing is started.
Further, the electrospinning needle head comprises an inner needle head and an outer needle head which are vertically arranged, the inner needle head is arranged in the outer needle head, the outer needle head is of a structure with a closed top and an open bottom, the top end of the inner needle head penetrates through the top of the outer needle head and is communicated with the injection needle tube, a sheath gas channel is formed in a space between the inner needle head and the outer needle head, an air inlet is formed in the side face of the outer needle head, and the sheath gas device is communicated with the sheath gas channel through the air inlet.
The interference of the micro-scale electric field to spinning is effectively reduced by adopting a sheath gas auxiliary mode in the electrospinning direct writing process, the precision of near-field electrospinning micro-nano forming is guaranteed by utilizing a precise displacement control platform and a sheath gas auxiliary simultaneous control scheme, the auxiliary control mode of a sheath gas device is beneficial to volatilization of a solvent in the spinning process, the fiber solidification time is shortened, precise point-to-point collection is provided for a collecting plate, the precision in the electrospinning fiber collection process is improved, the fixed-point lamination becomes possible, and the precision and the stability of a micro-nano printing preparation process, particularly the multilayer micro-nano structure spray printing preparation are further guaranteed.
Further, the sheath gas device comprises a gas storage bottle and a control valve, the gas storage bottle is communicated with the gas inlet of the outer needle through a gas guide pipe, and the control valve is arranged on the gas guide pipe. The nitrogen is stored in the gas storage bottle, the gas storage bottle adjusts the supply speed through the control valve, so that the flow speed of gas in the sheath gas channel is changed, the sheath gas maintains the stability of the inner needle head spraying electrospun solution in the fiber spray printing process, the interference of the environment and the electric field is weakened, the solvent volatilization is quickened, and the spray printing efficiency is improved.
Further, the inner needle and the outer needle are arranged concentrically. The coaxial arrangement ensures that the electrospinning solution sprayed by the inner needle head can be uniformly protected by sheath gas and blow-dried, so that the sprayed fibers are more uniform.
Further, the ratio of the diameter of the outer needle to the diameter of the inner needle is 2-5:1.
Further, the bottom opening of the outer needle is provided with an inward inclined guide plate. The inward inclined guide plate is beneficial to increasing the flow velocity of sheath gas at the opening and accelerating the evaporation of the solvent of the electrospinning solution.
The focusing heating light source focuses on a position on the collecting plate corresponding to the electrospinning needle head. Focusing heating light source aims at the collection place of the electrospun fiber, and the spray printing fiber is heated in a point heating mode, so that solvent volatilization is accelerated, and the stability of the stacked structure is ensured.
Further, the injection pump, the injection needle tube and the electric spinning needle head are made of Teflon, teflon, silica gel or plastics.
The technical scheme has the following beneficial effects:
In the process of electrospinning jet printing, a precise displacement control platform controls a collecting plate with photosensitive collecting units distributed in an array to move, the photosensitive collecting units which are not irradiated by light can be equivalent to insulation, a focusing irradiation light source irradiates on the photosensitive collecting units below an electrospinning needle in a focusing manner, the photosensitive collecting units are conducted, an electric field is formed between the photosensitive collecting units and the electrospinning needle, and the jet-printed fiber materials are stacked on the conducted photosensitive collecting units point to point under the action of the electric field. With the control displacement action of the precision displacement control platform, different photosensitive collecting units are changed from an insulating state to a conducting state, so that point-to-point spray printing pattern forming is realized, the photosensitive collecting units of the array are always kept on by the photosensitive collecting units located under the electrospinning needle heads, the purpose of point-to-point collection is achieved, the collecting precision of the collecting plate is improved, and the point-to-point spray printing laminated micro-nano structure can be realized.
Drawings
Fig. 1 is a block diagram of an apparatus for producing a multilayered microstructured fiber according to an embodiment.
Fig. 2 shows an embodiment of an electrospinning needle.
Fig. 3 is a structural view of a collecting unit on a collecting plate according to an embodiment.
Fig. 4 is a schematic illustration of a laminate structure according to an embodiment.
Fig. 5 is a schematic diagram of the preparation of a fixed-point stacking structure according to an embodiment.
Fig. 6 is a schematic diagram of a suspended structure according to an embodiment.
Reference numerals illustrate:
1. A syringe pump; 2. an injection needle tube;
3. A sheath gas device; 31. a gas cylinder; 32. a control valve;
4. A high voltage power supply;
5. An electrospinning needle head; 51. an inner needle; 52. an outer needle; 53. an air inlet; 54. a deflector;
6. Focusing a heating light source;
7. A collection plate; 71. a photosensitive collecting unit; 711. a conductive receiving block; 712. a photoresistor;
8. A displacement control platform; 9. focusing the illumination source.
Detailed Description
In order to describe the technical content, constructional features, achieved objects and effects of the technical solution in detail, the following description is made in connection with the specific embodiments in conjunction with the accompanying drawings.
Referring to fig. 1-6, a preparation device for a multilayer microstructure fiber based on near-field electrospinning direct writing in this embodiment includes an injection pump 1, an injection needle tube 2, an electrospinning needle 5, a high-voltage power supply 4, a collection plate 7, a displacement control platform 8, a focusing irradiation light source 9, a sheath air device 3 and a focusing heating light source 6, wherein the injection needle tube 2 is arranged on the injection pump 1, the injection needle tube 2 is connected with the electrospinning needle 5 through a conduit, the injection pump 1 conveys a solution in the injection needle tube 2 to the electrospinning needle 5, the collection plate 7 is positioned below the electrospinning needle 5, the displacement control platform 8 drives the collection plate 7 to move, the collection plate 7 comprises photosensitive collection units 71 distributed in an array and an insulating medium, the insulating medium is filled between adjacent photosensitive collection units 71, the focusing heating light source 6 focuses on a position on the collection plate 7 corresponding to the electrospinning needle 5, the focusing irradiation light source 6 focuses on the photosensitive collection unit 71 opposite to the electrospinning needle 5, the high-voltage power supply 4 is connected with the electrospinning needle 5 and the photosensitive collection units 71, the high-voltage power supply 4 is used for providing stable electric field evaporation process of the spinning needle 5 between the electrospinning needle 5 and the photosensitive collection units 71, and the electric field air device is used for accelerating the evaporation process of the spinning needle 3.
In this embodiment, the photosensitive collecting unit 71 includes a conductive receiving block 711 and a photo resistor 712, the conductive receiving block 711 is connected to the negative electrode of the power supply 4 through the photo resistor 712, the focus illumination light source 9 focuses the photo resistor 712 connected to the conductive receiving block 711 below the electrospinning needle 5, and the focus heating light source 6 is a laser source and irradiates the conductive receiving block 711 below the electrospinning needle 5. When the conductive receiving block 711 moves to the lower part of the electrospinning needle 5, the connected photoresistor 712 is affected by the focusing irradiation light source 9, the resistance value is reduced to zero, the connecting wire is connected with the negative electrode of the high-voltage power supply 4, an electric field is formed between the conductive receiving block 711 and the electrospinning needle 5, so that spray printing is started, meanwhile, the focusing heating light source 6 focuses on the position on the collecting plate 7 corresponding to the electrospinning needle 5, spray printing fibers are heated in a point heating mode, solvent volatilization is accelerated, and the stability of a stacked structure is ensured.
Specifically, each photosensitive collecting element 71 is square with a side length of 0.1mm-3mm, and a proper size can be selected according to different precision requirements.
The electrospinning needle 5 comprises an inner needle 51 and an outer needle 52 which are vertically arranged, the inner needle 51 is arranged in the outer needle 52, the inner needle 51 and the outer needle 52 are concentrically arranged, the outer needle 52 is of a structure with a closed top and an open bottom, the top end of the inner needle 51 penetrates through the top of the outer needle 52 and is communicated with the injection needle tube 2, a space between the inner needle 51 and the outer needle 52 forms a sheath air channel, an air inlet 53 is arranged on the side face of the outer needle 52, the sheath air device 3 comprises an air storage bottle 31 and a control valve 32, the air storage bottle 31 is communicated with the air inlet 53 of the outer needle 52 through an air guide tube, and the control valve 32 is arranged on the air guide tube. The interference of an electric field to spinning is effectively reduced by adopting a sheath gas auxiliary mode in the electrospinning direct writing process, the precision of near-field electrospinning micro-nano forming is guaranteed by utilizing a scheme of the precise displacement control platform 8 and sheath gas auxiliary simultaneous control, the auxiliary control mode of the sheath gas device 3 is beneficial to volatilization of a solvent in the spinning process, the fiber solidification time is shortened, precise point-to-point collection is provided for the collecting plate 7, the precision in the electrospinning fiber collecting process is improved, the fixed-point lamination is enabled to be possible, and the precision and the stability of the micro-nano printing preparation process, particularly the multilayer micro-nano structure spray printing preparation are further guaranteed.
In this embodiment, the diameter of the inner needle 51 is in the range of 0.2-0.5mm, the diameter of the outer needle 52 is in the range of 0.4-1mm, i.e. the ratio of the diameter of the outer needle 52 to the diameter of the inner needle 51 may be 2-5:1, the diameter of the inner needle 51 is 0.2mm, and the diameter of the outer needle 52 is 0.4mm.
The sheath gas device 3 inputs nitrogen, helium or other inert gases into the sheath gas channel, the diameter of the outer needle 52 is slightly larger than that of the inner needle 51, and the gas cylinder 31 adjusts the supply speed through the control valve 32, so that the flow speed of the gas in the sheath gas channel is changed, the stability of the inner needle 51 for spraying the electrospinning solution is maintained in the process of fiber spray printing by the sheath gas, the interference of the environment and an electric field is weakened, the solvent volatilization is accelerated, and the spray printing efficiency is improved.
In this embodiment, the bottom opening of the outer needle 52 is provided with an inwardly inclined baffle 54, and the inwardly inclined baffle 54 helps to increase the flow rate of sheath gas at the opening, which is beneficial to accelerating the evaporation of the solvent of the electrospinning solution.
The positive electrode of the high-voltage power supply 4 is connected with the electrospinning needle 5 and provides 0-20kV voltage for the electrospinning needle 5, a high-voltage electric field is formed between the electrospinning needle 5 and the photosensitive array unit collecting plate 7, and the capacity specification of the injection needle tube 2 can be 3mL, 5mL, 8mL, 10mL and the like. The injection pump 1 can adjust the feeding speed according to the specification of the injection needle tube 2 to ensure the liquid supply speed, the displacement control platform 8 is a high-precision displacement control platform, the horizontal movement rule can be controlled by a program, the control precision is 1 mu m, and the photosensitive array unit collecting plate 7 is a square plate 30mm in length.
In this embodiment, the syringe pump 1, the syringe tube 2, the electrospinning needle 5 and the catheter connected with the electrospinning needle 5 are made of teflon, silica gel or plastic materials.
The embodiment comprises a lifting fixing frame, not shown in the drawing, an electrospinning needle 5 and a focusing heating light source 6 are fixed on the lifting fixing frame, and the electrospinning needle 5 is positioned at a position 1-10cm above the unit collecting plate 7 and is adjustable in height. The focusing heating light source 6 is positioned above the side of the electrospinning needle 5, is 72 cm to 20cm away from the collecting plate and has adjustable height. The focusing irradiation light source 9 is positioned 1cm below the collecting plate 7, the position of the focusing irradiation light source 9 is fixed relative to the precise displacement control platform 8 and the electrospinning needle head 5, and the focusing irradiation light source 9 vertically corresponds to the space position of the electrospinning needle head 5. The high-voltage power supply 4 can be connected with the electrospinning needle head 5 at the positive electrode and the photosensitive array unit collecting plate 7 at the negative electrode, and can be exchanged between the positive electrode and the negative electrode.
As shown in fig. 4, the laminated structure is prepared by: the injection needle tube 2 is filled with a material to be subjected to jet printing, a piezoelectric material, a conductive material, a capacitance material and the like which can be modified by a high polymer according to the application requirements, the injection pump 1 is adjusted to set the liquid supply speed of an inner needle head for the electrospinning needle head 5, meanwhile, a control valve 32 of the sheath gas device 3, a high-voltage power supply 4 and a focusing heating light source 6 are opened, the high-voltage power supply 4 provides a stable electric field between the electrospinning needle head 5 and a collecting plate 7, and under the action of the electric field, the inner needle head reagent of the electrospinning needle head 5 forms a Taylor cone under the action of the electric field force and is subjected to fibrous jet printing on the collecting plate 7. Meanwhile, the sheath gas device 3 provides sheath gas for the electrospinning needle head 5 to form a stable sheath gas channel, so that volatilization of solvent in the electrospinning fibers is accelerated, vertical stable spraying of the electrospinning fibers is kept, the focusing heating light source 6 provides fixed-point heating for the fibers in the spraying process, and volatilization of the solvent is accelerated, so that the spray printing fibers are rapidly solidified and formed. In the process of collecting the electrospun fibers by the photosensitive array unit collecting plate 7, the precision displacement control platform 8 controls the displacement of the collecting plate 7 so as to control the spray printing pattern, meanwhile, the photosensitive collecting units 71 on the collecting plate 7 are irradiated by the focusing irradiation light source 9, and the arrayed photosensitive collecting units 71 gradually become in a conducting state, so that point-to-point collection is realized. In the embodiment, the precision displacement platform controls the displacement speed to be stable, and reciprocates under the control action of the precision displacement control platform 8 after the single jet printing fiber is formed and collected, so that the forming of the laminated jet printing mechanism is realized.
As shown in fig. 5, the process of preparing the fixed-point stacking structure is that the precision displacement platform controls the displacement of the collecting plate 7 and keeps the single photosensitive collecting unit 71 always under the electrospinning needle 5, meanwhile, the focusing irradiation light source 9 conducts the photosensitive collecting unit 71 and always keeps the single photosensitive collecting unit 71 to receive the jet printing material, the jet printing material is stacked on the single collecting unit under the action of the electric field force, the jet printing fiber is rapidly formed under the heating action of the focusing heating light source 6, the stacking and stacking stability is improved, and the preparation of the fixed-point stacking structure is realized through the methods of point-to-point heating and point-to-point collecting.
In fig. 6, the preparation process of the suspended structure is that the precision displacement control platform 8 performs the point-to-point lamination structure rapid jet printing on the leftmost photosensitive collecting unit 71 and the rightmost photosensitive collecting unit 71 of the collecting plate 7, then controls the collecting plate 7 to return to the leftmost unit, in the process, the high-voltage power supply 4 is closed, the jet printing is stopped, when the leftmost jet printed lamination structure is right below the electrospinning needle 5, the high-voltage power supply 4 is opened, the jet printing is started, the collecting plate 7 moves leftwards, and stops when the right lamination structure is above, by the method, suspended fibers can be jet printed on the left lamination structure and the right lamination structure, and the preparation of the suspended structure is realized.
In the invention, the volatilization of the solvent in the electrospinning process is accelerated by utilizing the sheath gas device 3 and the laser heating mode, so that the rapid forming of the spray printing pattern is ensured, and the spray printing manufacturing of the multilayer micro-nano structure can be rapidly carried out; meanwhile, the sheath gas device 3 and the precise displacement control platform 8 are stably controlled, so that the precision in micro-nano jet printing manufacture is ensured; the design of the photosensitive collecting units 71 arrayed on the collecting plate 7 realizes the point-to-point spray printing receiving, improves the spray printing precision, and simultaneously enables the rapid spray printing of complex micro-nano structures such as a single-point stacking structure and a suspension structure to be possible. The invention can realize rapid micro-nano jet printing manufacture and multilayer micro-nano structure lamination jet printing manufacture, and has a certain application prospect in the fields of flexible sensors, flexible electronics, bionic skin and the like.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the statement "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article, or terminal device that includes the element. Further, herein, "greater than," "less than," "exceeding," and the like are understood to not include the present number; "above", "below", "within" and the like are understood to include this number.
While the embodiments have been described above, other variations and modifications will occur to those skilled in the art once the basic inventive concepts are known, and it is therefore intended that the foregoing description and drawings illustrate only embodiments of the invention and not limit the scope of the invention, and it is therefore intended that the invention not be limited to the specific embodiments described, but that the invention may be practiced with their equivalent structures or with their equivalent processes or with their use directly or indirectly in other related fields.
Claims (5)
1. A preparation device of multilayer microstructure fiber based on near field electrospinning direct writing is characterized in that: the device comprises an injection pump, an injection needle tube, an electrospinning needle head, a high-voltage power supply, a collecting plate, a displacement control platform, a focusing irradiation light source, a sheath gas device and a focusing heating light source, wherein the injection needle tube is arranged on the injection pump, the injection needle tube is connected with the electrospinning needle head through a guide tube, the collecting plate is positioned below the electrospinning needle head, the displacement control platform drives the collecting plate to move, the collecting plate comprises photosensitive collecting units and insulating media which are distributed in an array, the insulating media are filled between adjacent photosensitive collecting units, the focusing irradiation light source focuses on the photosensitive collecting units below the electrospinning needle head, the high-voltage power supply is connected with the electrospinning needle head and the photosensitive collecting units, the sheath gas device is communicated with the electrospinning needle head, and the focusing heating light source focuses on the collecting plate at a position corresponding to the electrospinning needle head;
the electric spinning needle comprises an inner needle and an outer needle which are vertically arranged, the inner needle is arranged in the outer needle, the outer needle is of a structure with a closed top and an open bottom, the top end of the inner needle penetrates through the top of the outer needle and is communicated with the injection needle tube, a sheath gas channel is formed in a space between the inner needle and the outer needle, an air inlet is arranged on the side face of the outer needle, and the sheath gas device is communicated with the sheath gas channel through the air inlet;
the bottom opening of the outer needle head is provided with an inward inclined guide plate;
the photosensitive collecting unit comprises a conductive receiving block and a photoresistor, the conductive receiving block is connected with the high-voltage power supply through the photoresistor, and the focusing irradiation light source focuses on the photoresistor connected with the conductive receiving block below the electrospinning needle head.
2. The apparatus of claim 1, wherein the sheath gas device comprises a gas cylinder in communication with the inlet of the outer needle via a gas conduit and a control valve disposed on the gas conduit.
3. The preparation device of claim 1, wherein the inner needle and the outer needle are disposed concentrically.
4. The preparation device of claim 1, wherein the ratio of the diameter of the outer needle to the diameter of the inner needle is 2-5:1.
5. The preparation device according to claim 1, wherein the syringe pump, syringe needle and electrospun needle are made of teflon, silica gel or plastics.
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| CN103147138A (en) * | 2013-03-08 | 2013-06-12 | 厦门大学 | Electrospinning direct-writing jet-printing device enhancing focusing function by virtue of double layers of air |
| CN103407210A (en) * | 2013-08-02 | 2013-11-27 | 北京化工大学 | High-molecular biomimetic resistance-reducing surface and preparation device thereof |
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