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Method for preparing nano-silver hydrosol by using plant extract

A plant extract and hydrosol technology, applied in the field of nanomaterials, can solve the problems of potential harm to the environment and organisms, wide product particle size distribution, narrow particle size distribution, etc., and achieve high antibacterial efficiency, uniform distribution, and small particle size. Effect

Inactive Publication Date: 2013-02-27
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nano-silver prepared by physical methods has high purity and high activity, but the product has a wide particle size distribution and is easy to agglomerate; while nano-silver prepared by chemical methods has better dispersion, narrow particle size distribution, and relatively uniform appearance, but the surface of the material Often with impurities, and the reducing agent (borohydride, hydrazine hydrate, dimethylformamide, etc.) or protective agent (polyvinylpyrrolidone, metaphosphate, sodium dodecylsulfonate, etc.) introduced in the preparation process is toxic Strong or even carcinogenic, potentially harmful to the environment and organisms

Method used

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  • Method for preparing nano-silver hydrosol by using plant extract
  • Method for preparing nano-silver hydrosol by using plant extract
  • Method for preparing nano-silver hydrosol by using plant extract

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Disperse 0.1g of cornstarch in 10ml of deionized water, stir at 80°C until gelatinized to obtain a starch solution, add it to 20ml of silver ammonia solution with a concentration of 1wt%, and mix evenly. The silver ammonia solution is silver nitrate and ammonia water The complex formed after mixing is obtained into a starch-silver ion composite solution, and the composite solution is frozen at -20°C, and crushed after it freezes to obtain about 30g of ice powder with a particle size of 1-3mm .

[0027] The aloe leaves are washed with deionized water and peeled to obtain aloe vera, then cut into pieces, pulverized, filtered, separated and purified to obtain an aloe leaf extract, dispersed in deionized water, and prepared with 300ml of aloe with a concentration of 10 wt%. Aqueous solution of leaf extract, NaOH solution to adjust its pH to 11 to obtain alkaline aloe leaf extract; add the above-mentioned ice powder to alkaline aloe leaf extract, stir at 40°C for 300min, and...

Embodiment 2

[0029] Disperse 0.05g of tapioca starch in 5ml of deionized water, stir at 90°C until gelatinized to obtain a starch solution, add it to 20ml of silver ammonia solution with a concentration of 0.5wt%, and mix evenly. The silver ammonia solution is silver sulfate and A complex formed after mixing ammonia water to obtain a starch-silver ion composite solution. The composite solution is frozen at -10°C and crushed after freezing to obtain ice powder with a particle size of about 1-3mm. 25g.

[0030] Wash and peel the cactus with deionized water to obtain inner denim, then cut into pieces, crush, filter, separate, and purify to obtain cactus extract, disperse in deionized water, and prepare 175ml of cactus leaf extract with a concentration of 40 wt%. Liquid aqueous solution, NaOH solution to adjust its pH to 10.7 to obtain an alkaline cactus leaf extract; add the prepared ice powder to the alkaline cactus leaf extract, and stir at 30°C for 300min to obtain a nanosilver hydrosol. ...

Embodiment 3

[0035] Disperse 0.05g of wheat starch in 10ml of deionized water, stir at 90°C until gelatinized to obtain a starch solution, add it to 20ml of silver ammonia solution with a concentration of 0.2wt% and mix evenly, the silver ammonia solution is silver sulfate and A complex formed after mixing ammonia water to obtain a starch-silver ion composite solution. The composite solution is frozen at -10°C and crushed after freezing to obtain ice powder with a particle size of about 1-3mm. 30g.

[0036] Prepare aloe vera leaf extract and cactus extract according to embodiment 1 and 2 technical scheme. 200ml concentration is 20 wt % aloe vera leaf extract aqueous solution and 250ml concentration is 30 wt % cactus leaf extract aqueous solution mixes, and NaOH solution adjusts its pH to 10.7 to obtain alkaline plant leaf extract; Add above-mentioned ice powder to alkali In the leaf extract of sexual plants, stir at 50°C for 120 minutes to obtain nano-silver hydrosol with a particle size ...

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Abstract

The invention discloses a method for preparing nano-silver hydrosol by using a plant extract. The method comprises the following steps of: dissolving or dispersing soluble amylose into deionized water, stirring until the soluble amylase is completely gelatinized; adding a Tollens solution and mixing to obtain a starch-Tollens compound solution; freezing the compound solution into ice blocks and smashing the ice blocks into colloidal particle ice powder; and adding the colloidal particle ice powder into an alkaline plant blade extract and fully mixing to obtain the nano-silver hydrosol with the particle size of 1 to 100 nm. By the method, a silver ion and protecting agent compound solution is frozen and smashed; the obtained ice powder carried with silver ions is activated and reduced to obtain nano silver; the method is simple, convenient and high in controllability; and the prepared nano-silver hydrosol is high in stability and has the advantages of small nano-silver particle size, uniform distribution, high antibacterial efficiency and the like and can be widely applied to the field of electrons, textile, catalysis, medical materials, medical treatment and public health and the like.

Description

technical field [0001] The invention relates to a method for preparing nano-silver hydrosol by using a plant extract, and belongs to the technical field of nano-materials. Background technique [0002] Nanomaterials are a new type of material composed of nanoparticles with a size ranging from 1 to 100 nm. They have specific surface effects, small size effects, quantum size effects, and macroscopic quantum tunneling effects, and present many strange physical and chemical properties different from conventional materials. Nano-silver is a simple substance of metallic silver with a particle size of nanometers. Nano-silver materials have the basic characteristics of nano-materials, especially in electronics, optics, antibacterial and catalysis. It has obvious performance advantages and can be widely used in catalyst materials and battery electrode materials. , low-temperature thermally conductive materials, conductive pastes, antibacterial materials and medical materials have bro...

Claims

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Application Information

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IPC IPC(8): B22F9/00
Inventor 林红陈宇岳熊佳庆
Owner SUZHOU UNIV
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