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Polysaccharide-nano silver sol and preparation method thereof

A nano-silver sol and polysaccharide technology, applied in the field of nanometers, can solve the problems of preparing nanoparticles and achieve the effect of improving production efficiency

Active Publication Date: 2011-11-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, there is no report on the use of carboxymethyl chitosan quaternary ammonium salt as a reducing agent and stabilizer to prepare nano-metals, and there is no research on the preparation of nanoparticles under normal pressure by microwave radiation heating.

Method used

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  • Polysaccharide-nano silver sol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Carboxymethyl chitosan quaternary ammonium salt-nano silver sol of the present embodiment, its preparation method comprises the steps:

[0038] step 1

[0039] 0.00425g AgNO 3 Dissolved in 25mL deionized water to make 0.17mg / mL AgNO 3 aqueous solution, NaOH was added dropwise to the aforementioned freshly prepared AgNO 3 Formation of black Ag in aqueous solution 2 O precipitates, continue to drop NaOH to Ag 2 O precipitation no longer increases, and Ag 2 O suspension;

[0040] Then immediately drop ammonia water into the above Ag 2 O suspension, until the precipitate just dissolves, get solution;

[0041] step 2

[0042] 0.005g carboxymethyl chitosan quaternary ammonium salt (weight average molecular weight is 0.5×10 5 , the degree of carboxymethyl substitution is 10%, the degree of substitution of quaternary ammonium is 100%) firstly make a 0.1 mg / mL aqueous solution of carboxymethyl chitosan quaternary ammonium salt, stir it evenly, place it in a microwave ...

Embodiment 2

[0054] Carboxymethyl chitosan quaternary ammonium salt-nano silver sol of the present embodiment, its preparation method comprises the steps:

[0055] step 1

[0056] 0.0425g AgNO 3 Dissolved in 25mL deionized water to make 1.7mg / mL AgNO 3 aqueous solution, NaOH was added dropwise to the aforementioned freshly prepared AgNO 3 Formation of black Ag in aqueous solution 2 O precipitates, continue to drop NaOH to Ag 2 O precipitation no longer increases, and Ag 2 O suspension;

[0057] Then immediately drop ammonia water into the above Ag 2 O suspension, until the precipitate just dissolves, get solution;

[0058] step 2

[0059] 0.04g carboxymethyl chitosan quaternary ammonium salt (weight average molecular weight is 3.0×10 6 , the degree of carboxymethyl substitution is 100%, the degree of substitution of quaternary ammonium is 5%) firstly make 40mg / mL aqueous solution of carboxymethyl chitosan quaternary ammonium salt, stir it evenly and place it in a microwave react...

Embodiment 3

[0070] Carboxymethyl chitosan quaternary ammonium salt-nano silver sol of the present embodiment, its preparation method comprises the steps:

[0071] step 1

[0072] 0.2125g AgNO 3 Dissolved in 250mL deionized water to make 0.85mg / mL AgNO 3 aqueous solution, NaOH was added dropwise to the aforementioned freshly prepared AgNO 3 Formation of black Ag in aqueous solution 2 O precipitates, continue to drop NaOH until the precipitation no longer increases, and prepare Ag 2 O suspension;

[0073] Then immediately drop ammonia water into the above Ag 2 O suspension, until the precipitate just dissolves, get solution;

[0074] step 2

[0075] 0.01g carboxymethyl chitosan quaternary ammonium salt (weight average molecular weight is 3.0×10 5 , the degree of carboxymethyl substitution is 30%, the degree of substitution of quaternary ammonium is 50%) firstly make 1 mg / mL aqueous solution of carboxymethyl chitosan quaternary ammonium salt, stir it evenly and place it in a microw...

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Abstract

The invention discloses polysaccharide-nano silver sol and a preparation method thereof. The polysaccharide-nano silver sol is carboxymethyl chitosan quaternary ammonium salt-nano silver sol; and the carboxymethyl chitosan quaternary ammonium salt-nano silver sol is prepared by converting AgNO3 into more active AgNO3, using carboxymethyl chitosan quaternary ammonium salt as a reducing agent and astabilizing agent and adopting a microwave radiation heating method. The carboxymethyl chitosan quaternary ammonium salt is used as the reducing agent and the stabilizing agent for the first time, and the carboxymethyl chitosan quaternary ammonium salt-nano silver sol is quickly prepared in an aqueous phase under normal pressure by adopting the efficient microwave radiation heating method, so that the preparation process accords with 'green chemistry' advocated 'greenness' and 'environment friendliness' of reaction reagents, reducing agents and stabilizing agents in nano particle preparation;and because of the green preparation process and unique structure and properties of the carboxymethyl chitosan quaternary ammonium salt, the carboxymethyl chitosan quaternary ammonium salt-nano silver sol has huge application prospect in the fields of biology, medical treatment and the like.

Description

technical field [0001] The invention relates to the field of nanotechnology, in particular to a polysaccharide-nanometer silver sol and a preparation method thereof. Background technique [0002] Silver is a common and cheap precious metal with good bactericidal properties, stability and electrical conductivity, while nano-silver has good volume effect, surface effect, quantum size effect and macroscopic quantum tunneling effect. There is a broad application space in the fields of catalysis, superconductivity, biomaterials, optical materials or medical antibacterial materials. [0003] The preparation methods of nano-silver mainly include chemical reduction method, photochemical method, microemulsion method and radiation method, etc. Among them, the chemical reduction method has simple process, low equipment requirements and is easy to mass-produce. It is one of the most valuable nano-silver preparation methods. The traditional chemical reduction method needs to use hydrazi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 王小英刘博孙润仓郑灿丰
Owner SOUTH CHINA UNIV OF TECH
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