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Method for preparing silver nanoparticles with water-soluble starch

A technology of water-soluble starch and silver nanoparticles, which is applied in the direction of nanotechnology, can solve the problems of high price, high equipment requirements, and high silver nano-impurity content, and achieve the effect of convenient operation, simple equipment, and low price

Active Publication Date: 2016-10-12
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method of the invention can effectively overcome the poor uniformity, high requirements on equipment and high price of silver nanoparticles prepared by physical methods in the prior art; the silver nanoparticles prepared by chemical methods have high impurity content, wide particle size distribution, easy agglomeration, and environmental pollution. Serious; using plant extracts instead of chemical reducing agents to prepare silver nanoparticles is complicated, and there are defects such as toxic chemical reagent residues

Method used

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  • Method for preparing silver nanoparticles with water-soluble starch
  • Method for preparing silver nanoparticles with water-soluble starch
  • Method for preparing silver nanoparticles with water-soluble starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Wash the glass container with aqua regia, and then rinse it with deionized water;

[0025] (2) Take 25ml (0.46mol / L) water-soluble starch aqueous solution into a flask, heat to boiling, and boil for 5 minutes;

[0026] (3) Add 5ml (0.006mol / L) silver nitrate solution into the flask, test the pH value to 6.88, react under boiling conditions for 15 minutes, 20 minutes, 25 minutes, 30 minutes, 35 minutes and then take samples.

[0027] (4) The samples obtained after the above different reaction times were centrifuged at 8000 rpm for 10 minutes, and the obtained precipitate was dried at 40-50°C for 10 minutes to obtain silver nanoparticles.

[0028] figure 1 The ultraviolet-visible absorption spectrum (UV-Vis) chart was measured after centrifuging the samples obtained from the above reaction for 15 minutes, 20 minutes, 25 minutes, 30 minutes, and 35 minutes with a UV-2600 ultraviolet spectrophotometer from Shimadzu Corporation of Japan. The absorption peaks produced b...

Embodiment 2

[0032] (1) Wash the glass container with aqua regia, and then rinse it with deionized water;

[0033] (2) Take 25ml (0.58mol / L) water-soluble starch aqueous solution into the flask, heat to boiling, and boil for 15 minutes;

[0034] (3) Add 5ml (0.0075mol / L) silver nitrate solution into the flask, test the pH value to 6.71, react under boiling conditions for 15 minutes, 20 minutes, 25 minutes, 30 minutes, 35 minutes and then take samples.

[0035] (4) The samples obtained after the above different reaction times were centrifuged at 8000 rpm for 10 minutes, and the obtained precipitate was dried at 40-50°C for 10 minutes to obtain silver nanoparticles.

Embodiment 3

[0037] (1) Wash the glass container with aqua regia, and then rinse it with deionized water;

[0038] (2) Take 25ml (0.70mol / L) water-soluble starch aqueous solution into a flask, heat to boiling, and boil for 25 minutes;

[0039] (3) Add 5ml (0.009mol / L) silver nitrate solution into the flask, test the pH value to 6.56, react under boiling conditions for 15 minutes, 20 minutes, 25 minutes, 30 minutes, 35 minutes and then take samples.

[0040] (4) The samples obtained after the above different reaction times were centrifuged at 8000 rpm for 10 minutes, and the obtained precipitate was dried at 40-50°C for 10 minutes to obtain silver nanoparticles.

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Abstract

The invention provides a method for preparing silver nanoparticles with water-soluble starch. The method comprises the following steps that the water-soluble starch is dissolved in deionized water to prepare a water-soluble starch aqueous solution of which the concentration is 0.4-1.1 mol / L; silver nitrate crystals are dissolved in deionized water to prepare a silver nitrate solution of which the concentration is 0.006-0.014 mol / L; and the water-soluble starch aqueous solution is heated until boiled, the silver nitrate solution is added in the boiled water-soluble starch aqueous solution, the pH value of a reaction system is kept to 6.0-7.0, after being conducted for 15-35 min under the boiling condition, reaction is completed to obtain a reaction solution, the reaction solution is centrifugally separated to obtain a precipitate, and the precipitate is dried to obtain the silver nanoparticles. In the method, the adopted devices are simple and convenient to operate. The water-soluble starch is conveniently obtained, low in cost, and nontoxic. The prepared silver nanoparticles can be applied to the field of biological medicine.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a method for preparing silver nanoparticle by using water-soluble starch. Background technique [0002] Silver nanometer is a powdered silver element, the particle size is less than 100nm, generally between 25-50nm. Since its inception, it has attracted people's attention not only because of its unique electronic properties, optical properties, mechanical properties and catalytic properties, but also because of its good antibacterial properties, biocompatibility and easy surface modification. Therefore, silver Nano has broad application prospects in biomedical materials, chemical catalysts, ceramic materials, conductive pastes, sewage treatment, building materials, light-absorbing materials, coatings, sensors, high-performance electrode materials, etc., and has become a theory of functional materials with special properties. Important topic for resea...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00
CPCB22F9/24B82Y40/00
Inventor 孙丽吕鹏程尹跃超
Owner UNIV OF SHANGHAI FOR SCI & TECH
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