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Method for preparing water dispersible metal nano-particles

A metal nanoparticle and dispersed technology, applied in interdisciplinary fields, can solve the problems of complex metal nanoion technology and poor water dispersibility, and achieve the effect of strong operability, low cost and simple method

Inactive Publication Date: 2010-10-27
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the disadvantages of complicated preparation process and poor water dispersibility of metal nano ions existing in the prior art, the present invention proposes a preparation method of water dispersible metal nanoparticles, using natural renewable nano cellulose as a dispersant and Stabilizer, simple process, good water dispersibility

Method used

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  • Method for preparing water dispersible metal nano-particles
  • Method for preparing water dispersible metal nano-particles
  • Method for preparing water dispersible metal nano-particles

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preparation example Construction

[0021] A method for preparing water-dispersed metal nanoparticles: (1) preparing an aqueous dispersion of nanocellulose with a mass concentration of nanocellulose between 0.01% and 5%; (2) adding a certain amount of metal ions or metal ions The complex is added to the nanocellulose dispersion, the mass ratio of the metal ion or the metal ion complex to the cellulose is between 1:300 and 1:3, and the mechanical stirring is evenly mixed; (3) at a temperature of 30 to 90°C , adding a reducing agent to reduce metal ions, and aging at the reaction temperature for 10 minutes to 2 days. (4) centrifuging and washing the aged dispersion liquid for 1 to 6 times to obtain water-dispersed metal nanoparticles.

[0022] Above-mentioned nanocellulose can be with cotton fiber, hemp fiber, wood pulp fiber, bamboo fiber or microcrystalline cellulose, and the metal ion that adds can be any metal ion or its For the complex, the reducing agent used may be any one of hydrazine hydrate, sodium boro...

Embodiment 1

[0024] Configure 30 grams of mass concentration in the flask to be 0.5% nanocellulose suspension prepared from absorbent cotton, add 5 milliliters of 0.1mol / L HAuCl 4 solution, the temperature of the water bath was raised to 60° C. to keep warm, condensed and refluxed, and magnetically stirred. After 60 minutes, 1 mL of hydrazine hydrate was added dropwise, aged for 2 hours, and the gold nanoparticles were centrifuged, and the product was washed 6 times with water to obtain water-dispersed gold nanoparticles. Such as figure 1 As shown, the particle size is 5 ± 2nm. It can be seen from the figure that the dispersibility is very good, and there is no obvious settlement after preparing a 1% wt dispersion in water and standing for a month.

Embodiment 2

[0026] Configure 600 grams of 1%wt nanocellulose suspension prepared from flax in the flask, add 40 milliliters of 0.5mol / L Ni(NO 3 ) 3 solution, adjust the solution to weak alkalinity with NaOH, heat the water bath to 90°C, condense and reflux, and continue mechanical stirring. After 30 minutes, add 30mL of hydrazine hydrate dropwise, mature for 4 hours, centrifuge to separate nickel nanoparticles, and wash the product 3 times. To obtain water-dispersible nickel nanoparticles, such as figure 2 As shown, the particle size is below 5nm, and it can be seen from the figure that the dispersibility is very good, and there is no obvious settlement after preparing a 1%wt dispersion in water and standing for a month.

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Abstract

The invention discloses a method for preparing water dispersible metal nano-particles. The method comprises the following steps of: adding metal ions or metal ion complex into nano cellulose dispersion; reducing the metal ions with a reducer under a certain temperature condition; curing the reduced metal ions in reaction liquid for a period of time; and separating the mixed solution by centrifuging and washing the separated product to obtain the water dispersible metal nano-particles. The prepared water dispersible metal nano-particles can be applied in the fields of biology, physics, chemistry, medicine and the like.

Description

technical field [0001] The invention relates to a method for preparing water-dispersed metal nanoparticles, and belongs to the interdisciplinary field of materials, biology, chemistry and the like. technical background [0002] Due to the needs of sustainable development and environmental protection, in the past few decades, biodegradable materials based on natural renewable resources have attracted more and more attention from researchers and manufacturers at home and abroad. The preparation of nanocellulose and applications have also been extensively studied. Nanocellulose has the advantages of biocompatibility, biodegradability, and simple preparation methods, and is usually prepared from natural cellulose by acid-catalyzed hydrolysis. The chemical structure of cellulose is a linear polymer composed of D-glucopyranose rings linked by β-1,4-glycosidic bonds. There is one primary hydroxyl group and two secondary hydroxyl groups in the glucose unit in the cellulose molecul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 宋湛谦刘鹤王丹商士斌
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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