CN112705726A - Preparation method of shape-controllable nano silver powder - Google Patents
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 100
- 239000000843 powder Substances 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 100
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 33
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims abstract description 29
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims abstract description 29
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims abstract description 29
- 229910001961 silver nitrate Inorganic materials 0.000 claims abstract description 27
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 26
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- -1 polyoxyethylene Polymers 0.000 claims description 13
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 11
- 229940068918 polyethylene glycol 400 Drugs 0.000 claims description 6
- 239000002245 particle Substances 0.000 abstract description 36
- 239000003638 chemical reducing agent Substances 0.000 abstract description 11
- 239000002994 raw material Substances 0.000 abstract description 9
- 239000003381 stabilizer Substances 0.000 abstract description 8
- 238000009826 distribution Methods 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 5
- 229940083025 silver preparation Drugs 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 15
- 239000011259 mixed solution Substances 0.000 description 10
- 239000000243 solution Substances 0.000 description 10
- DUIOKRXOKLLURE-UHFFFAOYSA-N 2-octylphenol Chemical compound CCCCCCCCC1=CC=CC=C1O DUIOKRXOKLLURE-UHFFFAOYSA-N 0.000 description 8
- 238000003760 magnetic stirring Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 238000007865 diluting Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 238000001878 scanning electron micrograph Methods 0.000 description 5
- 239000006228 supernatant Substances 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 239000002086 nanomaterial Substances 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000011231 conductive filler Substances 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 238000009766 low-temperature sintering Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
- B22F9/24—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/054—Nanosized particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- Condensed Matter Physics & Semiconductors (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Composite Materials (AREA)
- Inorganic Chemistry (AREA)
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Abstract
本发明涉及纳米银制备技术领域，具体公开了一种形貌可控的纳米银粉的制备方法。所述的制备方法包含如下步骤：将硝酸银和聚乙烯吡咯烷酮溶解在乙二醇中，然后加入聚乙二醇；反应结束后即得纳米银粉。本发明提供了一种全新的纳米银粉的制备方法，该方法可以快速制备得到形貌可控的纳米银粉；成功克服了以硝酸银为原料、以聚乙烯吡咯烷酮为稳定剂、以乙二醇为还原剂制备纳米银，无法制备形貌可控的纳米银的技术缺陷。采用本发明所述的方法，可以快速制备得到粒径分布范围较窄、粒径均匀的纳米银粉。
The invention relates to the technical field of nano-silver preparation, and specifically discloses a preparation method of nano-silver powder with controllable morphology. The preparation method comprises the following steps: dissolving silver nitrate and polyvinylpyrrolidone in ethylene glycol, then adding polyethylene glycol; and obtaining nano silver powder after the reaction is completed. The invention provides a brand-new preparation method of nano-silver powder, which can quickly prepare nano-silver powder with controllable morphology; successfully overcomes the problem of using silver nitrate as raw material, polyvinylpyrrolidone as stabilizer and ethylene glycol as The technical defect of preparing nano-silver with reducing agent is the inability to prepare nano-silver with controllable morphology. By adopting the method of the present invention, nano-silver powder with narrow particle size distribution range and uniform particle size can be quickly prepared.
Description
Technical Field
The invention relates to the technical field of nano silver preparation, in particular to a preparation method of nano silver powder with controllable morphology.
Background
The 21 st century is an era of rapid development of electronic information manufacturing industry, electronic products such as smart phones, tablet computers, electronic books and wearable watches are ubiquitous, and the life style of human beings is thoroughly changed. With the development of high-tech industries, research and development of new related materials have attracted much attention from governments and research institutions throughout the world.
The micro-nano material has the characteristics of high surface activity, large surface area and the like, so that the micro-nano material becomes a 'pet' in the research field of related new materials, and particularly, the micro-nano structure material with optical and electric characteristics, such as micro-nano noble metal gold and silver, becomes a very active topic in the research field. Among them, the silver nanoparticles have advantages of excellent conductivity, oxidation resistance, low-temperature sintering property, stable chemical properties, easy processing, etc., and thus are widely used in the production of electronic tags (fidd), solar cell electrodes, membrane switches, flexible printed circuit boards, Organic Light Emitting Diodes (OLEDs), transparent conductive films, etc.
The application of the nano silver powder mainly takes conductive paste or electronic paste as a carrier, the nano silver powder is used as a conductive phase to be filled in a conductive compound to prepare conductive silver paste, conductive silver ink and the like, and then electronic printing means such as screen printing, impression printing, ink-jet printing and the like are used for producing electronic products and components thereof. That is to say, the silver nanopowder as the conductive filler is the basis of the conductive ink material, and plays an important role in the conductive silver paste and the conductive silver ink. In recent years, the investment of various countries on preparing high-performance nano silver powder is huge, and silver powder manufacturers such as DuPont, Sumitomo and Tianzhong Japan occupy most of the global market due to the advanced production process. However, the starting of China is relatively late, and a small gap exists between high-end silver powder products and abroad, so that the development of the nano silver powder which has excellent product quality and can be applied to actual products has very important theoretical and practical significance.
The liquid phase reduction method has become one of the most main methods for preparing the micro-nano silver powder because of the advantages of simple production equipment, convenient operation, low price of raw materials and the like. However, the existing liquid phase reduction method is difficult to realize high-efficiency production with controllable size and controllable shape, and the service performance and application value of the nano silver powder are seriously influenced. Therefore, the rapid and controllable preparation of the nano silver powder with uniform size and single appearance is a technical problem in the field of silver powder production at present.
The closest prior art (schwann (er.) bracelet, et al research on the synthesis of stable nano-silver sol by ethylene glycol method [ J ] chemical world, 2009,5:257 + 259) discloses a method for preparing nano-silver sol by using silver nitrate as a raw material, polyvinylpyrrolidone as a stabilizer and ethylene glycol as a reducing agent; although the method can realize the rapid preparation of the nano silver, the prepared nano silver has a random shape; the method is uncontrollable and impossible for preparing nano silver with specific shape and size.
Disclosure of Invention
In order to solve the technical problems that in the prior art, silver nitrate is used as a raw material, polyvinylpyrrolidone is used as a stabilizer, and glycol is used as a reducing agent to prepare nano silver, the shape of the nano silver is not controllable, and the nano silver with consistent shape cannot be prepared; the invention provides a preparation method of nanometer silver powder with controllable morphology.
The technical problem to be solved by the invention is realized by the following technical scheme:
a preparation method of nanometer silver powder with controllable morphology comprises the following steps:
dissolving silver nitrate and polyvinylpyrrolidone in ethylene glycol, and then adding polyethylene glycol; and (3) reacting for 15-30 min at 130-160 ℃, and obtaining the nano silver powder after the reaction is finished.
The inventor finds that the nano silver is prepared by taking silver nitrate as a raw material, polyvinylpyrrolidone as a stabilizing agent and glycol as a reducing agent, although the nano silver can be quickly prepared; the prepared nano silver is irregular in shape, and the prepared nano silver has various shapes such as particles, blocks and rods; the preparation of the material cannot be controlled to obtain single granular, blocky or rod-shaped materials; namely, the method cannot control the shape of the nano silver. However, with the method, how to realize controllable morphology and produce nano silver with single morphology is a great technical problem in the field.
In order to solve the problem, the inventor finds out that: polyethylene glycol is added in the process of preparing the nano silver by using silver nitrate as a raw material, polyvinylpyrrolidone as a stabilizer and ethylene glycol as a reducing agent, and all the prepared nano silver is granular without the appearance of blocky and rodlike nano silver. Therefore, the single shape can be successfully prepared by adding the polyethylene glycol in the process of preparing the nano-silver by using the silver nitrate as the raw material, the polyvinylpyrrolidone as the stabilizer and the ethylene glycol as the reducing agent, and the technical problem that the shape of the nano-silver cannot be controlled in the prior art is solved.
Preferably, the using amount ratio of the silver nitrate to the polyvinylpyrrolidone to the ethylene glycol is 1g: 1-2 g: 150-300 mL.
Most preferably, the ratio of the amounts of silver nitrate, polyvinylpyrrolidone and ethylene glycol is 1g:1.5g:200 mL.
Preferably, the volume ratio of the ethylene glycol to the polyethylene glycol is 1-2: 1-2.
Most preferably, the volume ratio of ethylene glycol to polyethylene glycol is 2: 1.
Preferably, the reaction conditions are at 140 ℃ for 20 min.
Preferably, the reaction is carried out while stirring.
Preferably, the preparation method of the morphology-controllable nano silver powder specifically comprises the following steps:
dissolving silver nitrate and polyvinylpyrrolidone in ethylene glycol, and reacting for 5-10 min at 130-160 ℃; adding polyethylene glycol containing octyl phenol polyoxyethylene ether-10, and continuously reacting for 10-20 min at 130-160 ℃; and obtaining the nano silver powder after the reaction is finished.
Further research by the inventor shows that under the above method conditions, the nano silver powder with a single granular morphology can be prepared; however, the prepared silver powder still has the defect of wide particle size distribution range, which causes uneven particle size. However, on the basis of the method, how to prepare the nano silver powder with narrow particle size distribution range and uniform particle size is another technical problem in the front of technicians.
In order to solve the problem, the inventors further conducted a large number of experiments and found that: in the preparation steps, silver nitrate and polyvinylpyrrolidone are dissolved in ethylene glycol to react for 5-10 min, then polyethylene glycol containing octyl phenol polyoxyethylene ether-10 is added, and the reaction is continued for 10-20 min at 130-160 ℃. And adding polyethylene glycol containing octyl phenol polyoxyethylene ether-10 after reacting for a period of time, so that the prepared nano silver particles have narrow particle size distribution range and uniform particle size. The method successfully overcomes the defect of uneven particle size caused by wider particle size distribution range of the particles.
Preferably, the dosage ratio of the octyl phenol polyoxyethylene ether-10 to the polyethylene glycol is 1g: 100-200 mL.
Preferably, the polyethylene glycol is polyethylene glycol 400.
Preferably, the molecular weight of the polyvinylpyrrolidone is 25000-60000.
Has the advantages that: the invention provides a brand-new preparation method of nano silver powder, which can quickly prepare the nano silver powder with controllable morphology; the technical defect that the shape-controllable nano silver can not be prepared by using silver nitrate as a raw material, polyvinylpyrrolidone as a stabilizer and ethylene glycol as a reducing agent is overcome successfully. By adopting the method, the nano silver powder with narrow particle size distribution range and uniform particle size can be quickly prepared.
Drawings
FIG. 1 is an SEM photograph of the nano silver powder prepared in example 1.
FIG. 2 is an SEM image of the nano silver powder prepared in example 2.
Fig. 3 is an SEM image of the nano silver powder prepared in comparative example 1.
Fig. 4 is an SEM image of the nano silver powder prepared in comparative example 2.
Fig. 5 is an SEM image of the nano silver powder prepared in comparative example 3.
Detailed Description
The present invention will be further explained with reference to the following specific examples and drawings, but the examples are not intended to limit the present invention in any manner.
EXAMPLE 1 preparation of Nano silver powder
(1) Dissolving 0.1g of silver nitrate and 0.15g of polyvinylpyrrolidone (molecular weight of 58000) in 20ml of ethylene glycol, adding 10ml of polyethylene glycol 400, and fully mixing and stirring to obtain a mixed solution;
(2) reacting the mixed solution at 140 ℃ for 20min at the magnetic stirring speed of 200 r/min;
(3) diluting with anhydrous ethanol 5 times after reaction, and centrifuging at 8000r/min for 20 min; and (3) after the solution is layered, sucking out the supernatant by using an injector, washing and purifying the precipitate solution by using absolute ethyl alcohol again, and repeating the process for 3 times to obtain the nano silver powder.
EXAMPLE 2 preparation of Nano silver powder
(1) Dissolving 0.1g of silver nitrate and 0.15g of polyvinylpyrrolidone (molecular weight of 58000) in 20ml of ethylene glycol, and reacting at 140 ℃ and a magnetic stirring rate of 200r/min for 5 min; then adding 10ml of polyethylene glycol 400 containing 0.1g of octyl phenol polyoxyethylene ether-10, and fully mixing and stirring to obtain a mixed solution;
(2) reacting the mixed solution at 140 ℃ for 15min at the magnetic stirring speed of 200 r/min;
(3) diluting with anhydrous ethanol 5 times after reaction, and centrifuging at 8000r/min for 20 min; and (3) after the solution is layered, sucking out the supernatant by using an injector, washing and purifying the precipitate solution by using absolute ethyl alcohol again, and repeating the process for 3 times to obtain the nano silver powder.
Example 2 differs from example 1 in that silver nitrate and polyvinylpyrrolidone are dissolved in ethylene glycol in the preparation step and reacted for a certain period of time, and then polyethylene glycol containing octylphenol polyoxyethylene ether-10 is added.
Comparative example 1 preparation of Nano silver powder
(1) Dissolving 0.1g of silver nitrate and 0.15g of polyvinylpyrrolidone (molecular weight of 58000) in 20ml of ethylene glycol, then adding 10ml of ethylene glycol, and fully mixing and stirring to obtain a mixed solution;
(2) reacting the mixed solution at 140 ℃ for 20min at the magnetic stirring speed of 200 r/min;
(3) diluting with anhydrous ethanol 5 times after reaction, and centrifuging at 8000r/min for 20 min; and (3) after the solution is layered, sucking out the supernatant by using an injector, washing and purifying the precipitate solution by using absolute ethyl alcohol again, and repeating the process for 3 times to obtain the nano silver powder.
The difference between the comparative example 1 and the example 1 is that no reducing agent polyethylene glycol is added in the preparation process, and all the reducing agent ethylene glycol is used as the reducing agent.
Comparative example 2 preparation of Nano silver powder
(1) Dissolving 0.1g of silver nitrate and 0.15g of polyvinylpyrrolidone (molecular weight of 58000) in 20ml of ethylene glycol, and reacting at 140 ℃ and a magnetic stirring rate of 200r/min for 5 min; then adding 10ml of polyethylene glycol 400, and fully mixing and stirring to obtain a mixed solution;
(2) reacting the mixed solution at 140 ℃ for 15min at the magnetic stirring speed of 200 r/min;
(3) diluting with anhydrous ethanol 5 times after reaction, and centrifuging at 8000r/min for 20 min; and (3) after the solution is layered, sucking out the supernatant by using an injector, washing and purifying the precipitate solution by using absolute ethyl alcohol again, and repeating the process for 3 times to obtain the nano silver powder.
Comparative example 2 differs from example 2 in that the polyethylene glycol added stepwise does not contain octylphenol polyoxyethylene ether-10.
Comparative example 3 preparation of Nano silver powder
(1) Dissolving 0.1g of silver nitrate and 0.15g of polyvinylpyrrolidone (molecular weight of 58000) in 20ml of ethylene glycol, and reacting at 140 ℃ and a magnetic stirring rate of 200r/min for 5 min; then adding 10ml of polyethylene glycol 400 containing 0.1g of sodium dodecyl benzene sulfonate, and fully mixing and stirring to obtain a mixed solution;
(2) reacting the mixed solution at 140 ℃ for 15min at the magnetic stirring speed of 200 r/min;
(3) diluting with anhydrous ethanol 5 times after reaction, and centrifuging at 8000r/min for 20 min; and (3) after the solution is layered, sucking out the supernatant by using an injector, washing and purifying the precipitate solution by using absolute ethyl alcohol again, and repeating the process for 3 times to obtain the nano silver powder.
Comparative example 3 is different from example 2 in that silver nitrate and polyvinylpyrrolidone are dissolved in ethylene glycol to react for a certain period of time in the preparation step, and then polyethylene glycol containing sodium dodecylbenzenesulfonate is added. And example 2 was the addition of polyethylene glycol containing octylphenol polyoxyethylene ether-10.
Scanning SEM images of the nano silver powder prepared in the examples 1-2 and the comparative examples 1-3 by using an ULTRA 55FESEM type field emission scanning electron microscope produced by Germany Zeiss company; observing the morphology and the particle size range of the nano silver powder through an SEM picture; the results are shown in Table 1 and FIGS. 1 to 5.
TABLE 1 statistical results of morphology and particle size range of nano silver powder
| Morphology of | Range of particle size | |
| Example 1 | All in granular form | 30～170nm |
| Example 2 | All in granular form | 30～50nm |
| Comparative example 1 | Stick, block and granule | - |
| Comparative example 2 | All in granular form | 40～140nm |
| Comparative example 3 | All in granular form | 40～120nm |
As can be seen from table 1 and attached fig. 1 to 5, all the shapes of the nano silver particles prepared in example 1 are granular; the nano silver particles prepared in the comparative example 1 have irregular shapes including rods, blocks and particles. The preparation method is characterized in that polyethylene glycol is added in the process of preparing nano silver by taking silver nitrate as a raw material, polyvinylpyrrolidone as a stabilizer and ethylene glycol as a reducing agent, and all the prepared nano silver is granular without the appearance of blocky and rodlike nano silver; the method can successfully prepare the nano silver with single appearance, overcomes the technical problem that the appearance of the nano silver cannot be controlled in the prior art, and successfully realizes the appearance control.
As can be seen from the table 1 and the attached drawings 1-5, although the granular nano silver powder can be prepared in the embodiment 1, the shape can be controlled; however, the prepared nano silver powder particles have the particle size range of 30-170 nm, wide particle size range and uneven particle size. In the embodiment 2, on the basis of the embodiment 1, silver nitrate and polyvinylpyrrolidone are dissolved in ethylene glycol and are reacted for a period of time, then polyethylene glycol containing octyl phenol polyoxyethylene ether-10 is added for reaction, the particle size range of the silver nanoparticles can be successfully controlled within 30-50 nm by adopting the method, the particle size range of the silver nanoparticles is greatly reduced, and the silver nanoparticles obtained by adopting the technical method have narrow particle size range and uniform size; the method successfully solves the defect of uneven particle size caused by wider particle size distribution range of the particles.
As can be seen from Table 1 and accompanying FIGS. 1-5, comparative examples 2 and 3 have no significant improvement in particle size range over example 1; the silver nitrate and the polyvinylpyrrolidone are dissolved in the ethylene glycol to react for a period of time, and then the polyethylene glycol containing the octyl phenol polyoxyethylene ether-10 is added to obtain the nano silver particles with narrow particle size range and uniform size; the polyethylene glycol does not contain octyl phenol polyoxyethylene ether-10 or contains other dispersing agents, and the nano silver particles with narrow particle size range and uniform size cannot be prepared.
Claims (10)
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