Nano silver colloid aqueous solution preparation method using sodium cellulose glycolate

A technology of sodium carboxymethyl cellulose and aqueous solution, which is applied in the fields of medical sterilization, metal optoelectronics and catalytic nano-functional material synthesis, can solve the problem of unknown molecular weight range of sodium carboxymethyl cellulose, uneven product particle size and shape, and cost. Control simplicity and lack of consideration, to achieve the effect of easy regulation of particle size distribution, convenience for large-scale industrial production, and realization of large-scale industrial production

Inactive Publication Date: 2009-06-10
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Disclosed a kind of method that adopts sodium carboxymethyl cellulose as reductant and protective agent to prepare nano-silver particles as Chinese patent CN101121203A simultaneously, but the molecular weight range of the sodium carboxymethyl cellulose that it uses is unknown, prepares the product The size and shape of the particles are not uniform, and an additional microwave heating device is required in the implementation process, which is not conducive to large-scale industrial production; although the method described in the Chinese patent CN1686646A can obtain monodisperse nano silver wi

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  • Nano silver colloid aqueous solution preparation method using sodium cellulose glycolate
  • Nano silver colloid aqueous solution preparation method using sodium cellulose glycolate
  • Nano silver colloid aqueous solution preparation method using sodium cellulose glycolate

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Embodiment 1

[0018] Add 0.34g of silver nitrate to 10mL of deionized water to make solution A; add 0.012g of reducing agent and protective agent sodium carboxymethylcellulose (Mw≈90,000) into 20mL of deionized water to dissolve, and adjust the pH value at 9- 11 to prepare solution B; take 0.1mL of solution A and add it to solution B, and react at 15°C for 20 hours to obtain a light yellow silver colloidal aqueous solution. The results of transmission electron microscopy are shown in the attached figure 1 As shown, the average particle size of the obtained silver nanoparticles is less than 60nm.

Embodiment 2

[0020] Add 0.34g of silver nitrate to 10mL of deionized water to make solution A; add 0.012g of reducing agent and protective agent sodium carboxymethyl cellulose (Mw≈90,000) into 20mL of deionized water, stir thoroughly for 30min (speed 200r / min) after dissolving, adjust the pH value between 7-9 to make solution B; take 0.1mL of solution A and add it to solution B, place it in a water bath and heat it to 60°C; continue to stir and react for 4 hours to obtain yellow nano Silver colloid aqueous solution, transmission electron microscopy results as attached figure 2 As shown, the average particle size of the obtained nano-silver particles is less than 100 nanometers.

Embodiment 3

[0022] Add 0.34g of silver nitrate into 10mL of deionized water to prepare liquid A; add 0.004g of reducing agent and protective agent sodium carboxymethyl cellulose (Mw≈90,000) into 20mL of deionized water, stir thoroughly for 30min (speed 100r / min ) after dissolving, adjust the pH value between 7-9 to make solution B; take 0.1mL of solution A and add it to solution B, place it in a water bath and heat it to 80°C; continue to stir and react for 4 hours to obtain yellow nano-silver Sol aqueous solution, transmission electron microscopy results are as attached image 3 As shown, the average particle diameter of the obtained silver nanoparticles is about 30 nanometers.

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Abstract

The invention discloses a method for preparing a nanometer silver colloid aqueous solution by adopting sodium carboxymethyl cellulose. The method comprises the following steps: a silver nitrate solid is dissolved in deionized water so as to prepare a silver nitrate aqueous solution A; sodium carboxymethyl cellulose is dissolved in deionized water so as to prepare a solution B; the solution A and the solution B are mixed, wherein the concentration of silver nitrate is 5*10<-5>-2.5*10<-2> mol/l, and the concentration of the sodium carboxymethyl cellulose is 0.2 to 25 g/l; the pH value of the solutions is controlled between 7 and 11; and the solutions react for 2 to 20 hours at a temperature between 15 and 90 DEG C, so as to obtain the aqueous solution containing silver colloid particles with the average particle size less than 100 nanometers. The nanometer silver colloid aqueous solution obtained by the method is brownish-grey at high concentration and is transparent bright yellow after dilution. The prepared nanometer silver colloid particles are stable in shape, good in dispersibility, adjustable and controllable in particle size distribution. The method has the advantages that the method adopts a common reaction vessel for reaction, and is simple in process, little in equipment investment and easy to implement, and raw materials involved in the reaction are friendly to environment, free from pollution, few in product impurities and convenient for post-treatment.

Description

technical field [0001] The invention discloses a method for preparing nano-silver colloid aqueous solution by using sodium carboxymethyl cellulose, a green chemical process for preparing nano-silver colloid aqueous solution by using carboxymethyl cellulose sodium as a chemical reducing agent and a protective agent at the same time under mild conditions , which belongs to the technical field of medical sterilization, metal photoelectricity and catalytic nano functional material synthesis. Background technique [0002] In recent years, with the wide application of nano-silver materials in the fields of superconductivity, antibacterial, biology, catalysis, microelectronics and photonic crystals, various related preparation technologies have also been developed rapidly. The liquid-phase chemical reduction method adopted in the present invention has a complete theoretical system, good equipment foundation, mature process conditions, and easy control. It has significant advantages...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 王虹史玉立吕丽云胡浩
Owner TIANJIN UNIV
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