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Cellulose/silver nano composite material and preparation method thereof

A composite material, silver nanotechnology, applied in the direction of nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of strict preparation process conditions, unfavorable industrial promotion and application, long reaction time, etc., and achieve narrow particle size distribution range, Facilitate the promotion and use of industrialization, and the effect of short reaction time

Inactive Publication Date: 2010-08-25
BEIJING FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] At present, most of the cellulose / silver nanocomposites use bacterial cellulose with a special three-dimensional structure as the matrix phase to prepare cellulose composites containing nanosilver particles, so that silver can be attached or coated in the fiber network structure. , these preparation methods are complex in process, long in reaction time, and require strict preparation process conditions, especially the use of bacterial cellulose as a substrate, which is not conducive to industrialization and application

Method used

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  • Cellulose/silver nano composite material and preparation method thereof
  • Cellulose/silver nano composite material and preparation method thereof
  • Cellulose/silver nano composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] 1. Preparation of microcrystalline cellulose solution

[0061] Add 3.044g LiCl to 40mL N,N-dimethylacetamide to form a LiCl / N,N-dimethylacetamide solution, wherein the mass percentage of LiCl is 7.5%;

[0062] Add 2.848g of microcrystalline cellulose into the above solution, heat and stir at 90°C until a uniformly dispersed microcrystalline cellulose solution is obtained, wherein the molecular weight range of the microcrystalline cellulose is: 34843-38894.

[0063] 2. Preparation of cellulose / silver nanocomposites

[0064] 1) Preparation of suspension

[0065] First, 5 mL of microcrystalline cellulose solution was added to 30 mL of N,N-dimethylacetamide, and then 0.338 g of AgNO 3 and 3.000g of ascorbic acid were added therein, stirred evenly, until there was no precipitation, and a suspension was made;

[0066] 2) Microwave radiation treatment

[0067] The suspension was put into a microwave reactor (Beijing Xianghu Technology Development Co., Ltd., model: XH100B),...

Embodiment 2

[0074] Except that the amount of silver chloride used in the preparation of the cellulose / silver nanocomposite was 0.287g, the amount of ascorbic acid was 3.522g, the microwave radiation treatment temperature was 180°C, and the treatment time was 10min, the rest was the same as in Example 1.

[0075] The morphology of the prepared cellulose / silver nanocomposites was examined by scanning electron microscopy. FIG. 5 is a scanning electron micrograph of the cellulose / silver nanocomposite prepared in this example. Scanning electron micrographs show that the silver nanoparticles prepared in this example are dispersed on the microcrystalline cellulose substrate. The particle size of the elemental nano silver particles of the cellulose / silver nanocomposite material is 450-500nm, and the content of the nano silver particles in the composite material is 37.7%.

Embodiment 3

[0077] In addition to adding 3.705g LiCl to 40mL N,N-dimethylacetamide in the process of preparing the microcrystalline cellulose solution, forming a LiCl / N,N-dimethylacetamide solution, wherein the mass percent content of LiCl is 9% 3.384g microcrystalline cellulose is dissolved in LiCl / N, and microcrystalline cellulose solution is made in N-dimethylacetamide solution;

[0078] The amount of ascorbic acid used in the preparation of cellulose / silver nanocomposites was 1.762g; the microwave radiation treatment temperature was 180°C, and the treatment time was 5min; the absolute pressure of vacuum drying was 0.01MPa, and the vacuum drying temperature was 40°C. The moisture content of plain / silver nanocomposite material is 1.8%, and all the other are identical with embodiment 1.

[0079] The morphology of the prepared cellulose / silver nanocomposites was examined by scanning electron microscopy. FIG. 6 is a scanning electron micrograph of the cellulose / silver nanocomposite prepar...

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Abstract

The invention provides a cellulose / silver nano composite material and a preparation method thereof. In the method, the composite material is prepared by using solution of microcrystalline cellulose, a silver salt and a reducer as raw materials and N,N-dimethylacetylamide (DMAc) as solvent and by using a microwave radiation processing method. The cellulose / silver nano composite material prepared by the method has the advantage that the silver nanoparticles have uniform particle size and can uniformly distribute on a cellulose substrate, and therefore has a promising application prospect in biochemical field and in terms of antibacterial performance. The preparation method has the advantages of greatly simplifying production technical process, saving time, reducing cost, along with cheap raw materials, simple process, convenient operation, quick preparation and easily controllable technical conditions. Meanwhile, the preparation method does not require complex and expensive equipment and is favorable for industrial promotion.

Description

technical field [0001] The invention relates to a cellulose-based nanocomposite material and a preparation method thereof, in particular to a silver cellulose-based nanocomposite material and a preparation method thereof. Background technique [0002] Nanocomposites are composite materials with at least one dispersed phase whose one-dimensional scale is within the nanometer scale. The polymer-based nanocomposites are collectively referred to as polymer-based nanocomposites that use polymers as the matrix phase and metals, inorganic substances, and polymers as the reinforcing phase. Polymer-based nanocomposites have properties that exceed those of general composites, including tensile strength, elastic modulus, heat distortion temperature, and gas permeability. Among them, polymer-based inorganic nanocomposites not only have the surface effect and quantum size effect of nanomaterials, but also combine the rigidity, dimensional stability and thermal stability of inorganic mat...

Claims

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Application Information

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IPC IPC(8): B82B3/00B82B1/00
Inventor 马明国许凤孙润仓李书明贾宁
Owner BEIJING FORESTRY UNIVERSITY
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