Silver nanoparticles and preparation method thereof capable of realizing controllable macroscopic quantity

A silver nanoparticle and macro-quantity technology, which is applied in nanotechnology, metal processing equipment, transportation and packaging, etc., can solve problems such as difficulty in meeting large-scale macro-production, limited adsorption and reduction, and low content of nano-silver particles. Achieve the effects of uniform and controllable size, good dispersion and simple preparation method

Active Publication Date: 2020-12-11
WUHAN TEXTILE UNIV
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  • Application Information

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Problems solved by technology

However, due to the limited adsorption and reduction of silver ions by a single agarose, this method can only adsorb and treat a small amount of silver ions, and the content of the prepared nano-silver particles is very small, which is difficult to meet the requirements of large-scale industrial production. Require

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  • Silver nanoparticles and preparation method thereof capable of realizing controllable macroscopic quantity
  • Silver nanoparticles and preparation method thereof capable of realizing controllable macroscopic quantity
  • Silver nanoparticles and preparation method thereof capable of realizing controllable macroscopic quantity

Examples

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preparation example Construction

[0033] The invention provides a method for preparing silver nanoparticles in a macroscopically controlled manner, comprising the following steps:

[0034] S1. Add agarose and carboxymethyl chitosan into the lye, heat and stir to make them fully dissolve, and obtain a hot mixed solution; after the mixed solution is cooled, agarose / carboxymethyl chitosan composite gel is obtained. glue;

[0035] S2, fully soaking the composite gel obtained in step S1 in a solution containing silver ions to obtain a silver ion cross-linked double network composite gel;

[0036] S3, placing the silver ion cross-linked double network composite gel obtained in step S2 in a sodium borohydride solution for reduction reaction, to obtain a composite gel loaded with silver nanoparticles;

[0037]S4, the composite gel loaded with silver nanoparticles obtained in heating step S3, after it is fully dissolved, agarose / carboxymethyl chitosan / silver nanoparticles mixed solution is obtained, and after centrifu...

Embodiment 1

[0049] This embodiment provides a macro-controllable preparation method of silver nanoparticles, the schematic diagram of the preparation process is as follows figure 1 As shown, it specifically includes the following steps:

[0050] S1. Add agarose and carboxymethyl chitosan with a degree of deacetylation of 85% to a sodium hydroxide solution with a pH of 10, heat and stir at 85°C for 10 minutes to fully dissolve the agarose and carboxymethyl chitosan , to obtain a hot mixed solution; the concentration of agarose in the mixed solution is 1w / v%, and the concentration of carboxymethyl chitosan is 0.5w / v%; after the mixed solution is cooled to room temperature, the agarose / carboxylate Methyl chitosan complex gel.

[0051] S2, the composite gel obtained in step S1 is placed in a silver nitrate solution with a concentration of 0.1mol / L and soaked for 120min, so that the silver ions are fully adsorbed by the composite gel, and chelated crosslinked to obtain silver ion crosslinked ...

Embodiment 2～3 and comparative example 1

[0059] Embodiments 2-3 respectively provide a preparation method of silver nanoparticles. Compared with Embodiment 1, the difference is that the concentration of carboxymethyl chitosan in the mixed solution in step S1 is changed. The concentrations of carboxymethyl chitosan in Example 2 and Example 3 were 1w / v% and 2w / v% respectively, and the rest of the steps and process parameters were consistent with those in Example 1, and will not be repeated here.

[0060] Comparative Example 1 provides a method for preparing silver nanoparticles. Compared with Example 1, the difference is that carboxymethyl chitosan is not added in its step S1, and the prepared gel is only agarose gel. The remaining steps and process parameters are consistent with those in Example 1, and will not be repeated here.

[0061] The performance tests of the gel and silver nanoparticles prepared in Examples 2 to 3 and Comparative Example 1 are as follows: Figure 3-5 Shown; The performance contrast between th...

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Abstract

The invention discloses silver nanoparticles and a preparation method thereof capable of realizing a controllable macroscopic quantity. According to the invention, agarose / carboxymethyl chitosan composite gel is prepared by preparing an agarose / carboxymethyl chitosan mixed solution as a gel precursor solution and utilizing the reversible temperature-sensitive property of agarose; then the composite gel is soaked into a solution containing silver ions, and the silver ions are chelated and crosslinked with the gel, and are reduced in situ by using a reducing agent sodium borohydride, so that composite gel loaded with silver nanoparticles is obtained; and after heating and dissolving, the silver nanoparticles can be obtained through separation. Through the abovementioned manner, according tothe invention, the silver nanoparticles with uniform size and high dispersity can be prepared; and moreover, the preparation method is simple and wide in application range, facilitates regulation andcontrol over the product performance, meets the requirement of industrialized large-scale production, solves the problems that in the prior art, silver nanoparticles are low in dispersity, non-uniformin size and difficult to prepare with the controllable macroscopic quantity, and has a high practical application value.

Description

technical field [0001] The invention relates to the technical field of silver nanoparticle preparation, in particular to a silver nanoparticle and a macro-controllable preparation method thereof. Background technique [0002] Silver nanoparticles refer to silver particles whose characteristic dimensions are in the range of 1-100nm, between bulk objects and atoms and molecules. Compared with large-size silver materials, the nanoscale size of silver nanoparticles makes them have unique properties such as surface effects, small size effects, quantum size effects, and macroscopic quantum tunneling effects, thus presenting better optical, electrical, and magnetic properties. It shows broad application prospects in the fields of materials science, information science, life science and catalysis. [0003] At present, the preparation methods of silver nanoparticles can be mainly divided into two categories: the first category is physical methods, mainly including physical pulveriza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00
CPCB22F9/24B82Y40/00B22F1/054
Inventor 严坤王栋徐飞扬杨晨光李秀芳鲁振坦
Owner WUHAN TEXTILE UNIV
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