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Method for manufacturing nano-silver

A manufacturing method and nano-silver technology, which is applied in the field of nano-silver manufacturing and the preparation of silver ultrafine particles, can solve problems such as non-continuous production, unfavorable environment and safety, and achieve short production cycle, environmental protection, and good safety Effect

Inactive Publication Date: 2004-12-29
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of nanomaterials by irradiation chemical technology is a relatively new method. At present, the gamma ray radiation method is widely used, which uses cobalt 60 The γ-ray irradiation reaction system released by Co isotope to obtain nanomaterials has some disadvantages: one, 60 Co isotopes are radioactive substances, and when they cannot be utilized, they will become radioactive waste, which is harmful to the environment and safety; second, the preparation of nanomaterials with gamma rays is often intermittent and cannot be produced continuously
Judging from the current situation, there are no other suitable radiation sources to prepare nano-silver materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment one: the specific preparation steps of this embodiment are as follows:

[0016] a. First, weigh a certain amount of silver nitrate with FA1004 upper dish electronic balance, dissolve it in distilled water to make the concentration of silver ion reach 0.01mol / 100ml; then add the hydrophilic surfactant polyvinyl alcohol (PVA), the addition is 0.7 gram / 100ml; Add oxidative free radical OH radical scavenger isopropanol (IPA) again after stirring well, the addition is 2ml / 100ml; Preparation process is carried out in darkroom, and will The prepared solution is placed in a light-proof container and is to be irradiated;

[0017] B. the above-mentioned prepared colloidal solution is irradiated under the radiation of the electron beam that the insulating core electron accelerator produces, and its irradiation dose is 20Mrad;

[0018] c. Then wash the irradiated sample with absolute alcohol, and centrifuge it in a high-speed centrifuge, and repeat it several times to r...

Embodiment 2

[0024] Embodiment two: the specific preparation steps of this embodiment are as follows:

[0025] a. First, weigh a certain amount of silver nitrate with FA1004 upper dish electronic balance, dissolve it in distilled water, so that the concentration of silver ions reaches 0.02mol / 100ml; then add the hydrophilic surfactant polyvinyl alcohol (PVA), the addition is 1 gram / 100ml; Add oxidative free radical OH free radical scavenger isopropanol (IPA) after stirring evenly, the addition is 40ml / 100ml; The preparation process is carried out in the darkroom, and will The prepared solution is placed in a light-proof container and is to be irradiated;

[0026] B. the above-mentioned prepared colloidal solution is irradiated under the radiation of the electron beam that the insulating core electron accelerator produces, and its irradiation dose is 40Mrad;

[0027] c. Then wash the irradiated sample with absolute alcohol, and centrifuge it in a high-speed centrifuge, and repeat it severa...

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Abstract

The present invention is nano silver preparing process and belongs to the field of nano material preparing technology in radiochemistry. The technological process includes adopting silver nitrate as silver source, isopropanol as oxidant clearer in water solution, hydrophilic suitable for PVA for controlling the crystal kernel growth speed and grain size and electronic accelerator to produce electron beam for irradiation treatment; washing irradiated solution, centrifugal separation and stoving to obtain black nano silver powder. The present invention has simple technological process, short production period, no pollution and high safety, and the prepared nano silver grain is spherical, homogeneous in size and good in dispersivity.

Description

technical field [0001] The invention relates to a method for manufacturing nano silver, that is, a method for preparing ultrafine silver particles, and belongs to the technical field of radiation chemical manufacturing nano material technology. Background technique [0002] The application prospect of nano-silver is very broad. It can be used as conductive silver paste in integrated circuits. If a small amount of nano-silver is added to chemical fibers, some properties of chemical fibers can be changed, and it has strong bactericidal ability. Nano-silver crystals The efficiency of the heat exchanger as a dilution refrigerator is 30% higher than that of traditional materials. In addition, nano-silver can also be used as a catalyst, photolithography, and enhanced Raman spectroscopy. When nano-silver is doped in a semiconductor or insulator, a larger The third-order nonlinear susceptibility can be used to make optoelectronic devices such as optical switches. At present, the pr...

Claims

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Application Information

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IPC IPC(8): B22F9/30
Inventor 周瑞敏辛立辉
Owner SHANGHAI UNIV
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