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Method for preparing copper nanoparticles from modified polysaccharide

A copper nano-modification technology, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve the problems of high environmental hazards, high price, easy oxidation of copper nanoparticles in reaction time, etc. Low cost, mild reaction, good biocompatibility

Active Publication Date: 2018-08-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to aim at the currently reported preparation method of copper nanoparticles, the reaction process requires the use of reagents that are harmful to the environment or expensive, the reaction process requires high temperature, long reaction time and the prepared copper nanoparticles are easy to oxidize To provide a method for preparing copper nanoparticles with low cost, environmental friendliness, easy operation and excellent oxidation resistance

Method used

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  • Method for preparing copper nanoparticles from modified polysaccharide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Modification of starch

[0025] Take a 250 ml round bottom flask, add 10 g of starch, 5 g of sodium periodate and 100 ml of deionized water in sequence, and stir for 12 hours in an oil bath at 37°C. Filter and wash with water 4 times, then place in a vacuum freeze dryer for 72 hours to obtain dry dialdehyde starch powder.

[0026] (2) Dissolution of dialdehyde starch

[0027] Get 2 grams of dialdehyde starch prepared in step (1) and place it in a beaker, add 90 milliliters of sodium hydroxide-urea solutions with mass fractions of 6% and 4%, respectively. After stirring at room temperature for 1 hour, freeze in a -20°C refrigerator for 12 hours, and then slowly thaw at room temperature to obtain a dialdehyde starch solution.

[0028] (3) Preparation of copper nanoparticles

[0029] The dialdehyde starch solution that 5 milliliters of steps (2) process obtains is added in the glass vial, then add 1 milliliter of 1 mg / ml polyethyleneimine solution, 1 milliliter conc...

Embodiment 2

[0031] (1) Modification of cellulose

[0032] Take a 250 ml round bottom flask, add 10 g of cellulose, 5 g of sodium periodate and 100 ml of deionized water in sequence, and stir for 12 hours in an oil bath at 37°C. Filter and wash 4 times with water, then place in a vacuum freeze dryer for 72 hours to obtain dry dialdehyde cellulose powder.

[0033] (2) Dissolution of dialdehyde cellulose

[0034] Take 1 gram of dialdehyde cellulose prepared in step (1) and place it in a beaker, and add 90 milliliters of sodium hydroxide-urea solutions with mass fractions of 7% and 12%, respectively. After stirring at room temperature for 1 hour, freeze in a -20°C refrigerator for 12 hours, and then slowly thaw at room temperature to obtain a dialdehyde starch solution.

[0035] (3) Preparation of copper nanoparticles

[0036] Add the dialdehyde cellulose solution obtained in milliliter step (2) into the glass vial, then add 1 milliliter of 5 mg / ml polyethyleneimine solution, 1 milliliter ...

Embodiment 3

[0038] (1) Modification of starch

[0039] Take a 250 ml round bottom flask, add 10 g of starch, 5 g of sodium periodate and 100 ml of deionized water in sequence, and stir for 12 hours in an oil bath at 37°C. Filter and wash with water 4 times, then place in a vacuum freeze dryer for 72 hours to obtain dry dialdehyde starch powder.

[0040] (2) Dissolution of dialdehyde starch

[0041] Get 3 grams of dialdehyde starch prepared in step (1) and place it in a beaker, add 90 milliliters of sodium hydroxide-urea solutions with mass fractions of 6% and 4%, respectively. After stirring at room temperature for 1 hour, freeze in a -20°C refrigerator for 12 hours, and then slowly thaw at room temperature to obtain a dialdehyde starch solution.

[0042] (3) Preparation of copper nanoparticles

[0043] The dialdehyde starch solution that 5 milliliters of steps (2) process obtains is added in the glass vial, then add the polyethylenimine solution of 1 milliliter 5 mg / ml, 1 milliliter c...

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Abstract

The invention belongs to a preparation method of metal copper nanoparticles, and in particular relates to a method for preparing copper nanoparticles with excellent oxidation resistance by using a modified natural polysaccharide as a reducing agent and an amino-containing polymer as a protective agent in a liquid phase. The method comprises the steps that an aldehyde group is introduced into a starch chain framework by oxidation of sodium periodate, and then the starch is dissolved in a sodium hydroxide-urea solution to obtain a dialdehyde starch solution; the dialdehyde starch solution, copper sulfate pentahydrate and polyethyleneimine are sequentially added into a vessel and stirred, and after introducing argon gas for reaction for a certain period of time, the copper nanoparticles are obtained. The method provided by the invention has the advantages of simple operation, low cost, no need of high temperature condition, no need of any toxic reagents, energy saving and environmental protection. Also, the prepared nanoparticles can be stored in the form of dry powder under ambient conditions for at least three months.

Description

technical field [0001] The invention relates to a method for preparing metal nanoparticles, in particular to a method for preparing copper nanoparticles with excellent oxidation resistance by using modified natural polysaccharides as reducing agents and amino-containing polymers as protective agents. Background technique [0002] Due to their nano-effects, metal nanoparticles exhibit special physical and chemical properties that traditional metal bulk materials do not have, so they are widely used in catalysis, sensing, optoelectronics, biomedicine and other fields. At present, the research on metal nanoparticles mainly focuses on gold, silver, platinum and other noble metal nanoparticles. Compared with gold, silver and other nanoparticles, copper nanoparticles also have excellent catalytic, optical, electrical, thermal and bactericidal properties, and have important applications in catalytic materials, electronic displays, light-transmitting conductive films, and bactericid...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F9/24B22F1/054
Inventor 李立东唐馥唐亮珍
Owner UNIV OF SCI & TECH BEIJING
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