Method for in-situ preparation of silver nanoparticles loaded on natural cellulose sheet

A technology of natural cellulose and silver nanoparticles, which is applied in the direction of metal coating, etc., can solve the problems of complex preparation methods, widened particle size distribution, and larger particle size of silver nanoparticles, and achieves a simple preparation process and low cost. Effect

Active Publication Date: 2010-01-13
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation methods of the above types of substrates are complicated, and the impact of many polymer films and DNA macromolecules on the environment is still unclear, and usually, a substrate contains several different electron-withdrawing groups at the same time, and these groups The difference in the adsorption capacity of silver nanoparticles between clusters will eventually lead to larger particle size and wider particle size distribution of silver nanoparticles.

Method used

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  • Method for in-situ preparation of silver nanoparticles loaded on natural cellulose sheet
  • Method for in-situ preparation of silver nanoparticles loaded on natural cellulose sheet
  • Method for in-situ preparation of silver nanoparticles loaded on natural cellulose sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The natural cellulose source used is the dust-free wiping paper (Kinwipies) produced by Canada Kimberly-Clark Company. Cutting area is 40×50cm 2 The dust-free wiping paper, dipped in the silver nitrate aqueous solution with a concentration of 100mmol / L, put it still for 1 minute, took it out and immersed it in anhydrous ethanol solution, put it still for 30 seconds, took it out and soaked it in sodium borohydride with a concentration of 800mmol / L Aqueous solution, the reaction is violent, and a large number of bubbles are generated rapidly. The dust-free wipe paper is fixed with a glass rod in the beaker carrying the sodium borohydride reaction solution. It can be observed that the dust-free wipe paper turns from white to yellow, indicating the formation of silver nanoparticles. , put it still for 10 minutes, take it out and soak it in deionized water, take it out after 1 minute, place it in a vacuum dryer, dry it at room temperature for 24 hours, and obtain the silver ...

Embodiment 2

[0034] Implementation step is identical with embodiment 1, but the concentration of silver nitrate aqueous solution becomes 100mmol / L, and the concentration of reducing agent sodium borohydride is successively 200mmol / L, 400mmol / L, 600mmol / L, 800mmol / L, figure 2 The ultraviolet-visible absorption spectrogram of the in-situ load on the dust-free wiping paper produced by Canadian Kimberly-Clark Company produced under the above concentration ratio conditions, wherein curves a, b, c, and d are respectively in The concentration ratio silver nitrate: sodium borohydride is 100: 200mmol / L, 100: 400mmol / L, 100: 600mmol / L, the ultraviolet-visible absorption spectrum of the sample prepared under the condition of 100: 800mmol / L. Depend on figure 2 It can be seen that with the increase of the reducing agent sodium borohydride concentration, the peak position of the curve d, c, b, and a gradually shifts to blue. From the classical theory of the relationship between the peak and the partic...

Embodiment 3

[0037] Implementation steps are the same as in Example 1, but the concentration ratio is changed in a larger range. image 3 (a), 3(b), 3(c), and 3(d) are the in-situ loading of silver nanoparticles on the dust-free wiping paper produced by Canada Kimberly-Clark Company under different concentration ratio conditions. Transmission electron microscope photographs, in which image 3 (a), image 3 (b), image 3 (c), image 3 (d) are transmission electron micrographs of samples prepared under the conditions of molar concentration ratio silver nitrate: sodium borohydride 1:2, 1:8, 1:80, 1:800 respectively. It can be seen from the above figure that when the concentration ratio changes from 1:2 to 1:8, the average particle diameter of the sample obtained changes from 6.8 to 2.7nm, and when the concentration ratio is further increased until 1:800, the average particle diameter of the sample is basically maintained at 2.7nm range, but the particle size distribution of the sample con...

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Abstract

The invention belongs to the technical field of nanometer material preparation and particularly relates to a method for the in-situ preparation of silver nanoparticles loaded on a natural cellulose sheet. In the method, natural fibers which are rich in natural world and serve as a template are subjected to soak in aqueous solution of silver nitrate, rinse by solution of absolute ethanol, soak in aqueous solution of sodium borohydride for reduction, rinse by high-purity deionized water and other processes to form the silver nanoparticles loaded on natural cellulose sheet in situ. Compared with the conventional product of silver nanoparticles loaded in situ, the product prepared by the method has the advantages that: 1, the particle size of the prepared silver nanoparticles is small and the particle size distribution of the prepared silver nanoparticles is narrow; 2, the natural cellulose sheet adopted as a loading substrate is low in cost and environmentally friendly; and 3, the preparation process can be carried out at normal temperature without any protective agent and stirring facilities, so the preparation technology is simple. Due to the excellent performance of the silver nanoparticles, the product has great application values in aspects such as antibiosis, catalysis and signal enhancement.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to an in-situ preparation method of silver nanoparticles with small scale and uniform particle size loaded on natural cellulose sheets. Background technique [0002] In recent years, the rapid development of new technologies for the preparation of composite materials has made these new technologies based on different principles and starting from different structural levels play an important role in the preparation of a new generation of composite materials. The in-situ composite technology characterized by the generation of dispersed phases in the medium and good compatibility with the matrix, and no repeated pollution is particularly prominent. The principle of in-situ compounding is: select the appropriate reactant (gas phase, liquid phase or solid phase) according to the requirements of material design, and generate the uniformly distributed first mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H19/06
Inventor 贺军辉朱纯阳
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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