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Method for preparing nano silver solution by electrolysis

An electrolytic solution and nano-silver technology, which is applied in the field of preparation of nano-silver solution, can solve the problems that the properties of nano-silver are easily affected and nano-silver is difficult to preserve, and achieve the effects of wide application value, long stable time and high safety

Inactive Publication Date: 2011-09-14
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing nano-silver solution by electrolysis, which solves the problems in the prior art that the properties of nano-silver are easily affected by the chemical reduction method used in the preparation of nano-silver and that nano-silver is difficult to preserve.

Method used

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  • Method for preparing nano silver solution by electrolysis
  • Method for preparing nano silver solution by electrolysis
  • Method for preparing nano silver solution by electrolysis

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Embodiment 1

[0032] The preparation of embodiment 1 nano silver solution

[0033] Use a silver needle with a diameter of 2mm and a length of 90mm as an electrode, add 200mL of water to a 250mL beaker, weigh 2g of polyvinyl alcohol and dissolve it in the added water under magnetic stirring in a water bath to form a colorless and transparent solution. After the alcohol was completely dissolved, the temperature of the water bath was fixed at 95°C. After the temperature is constant, add a polytetrafluoroethylene stopper with a silver needle electrode fixed on the beaker, keep the distance between the electrodes at 2cm, and conduct electricity for 3min at a DC voltage of 25V to obtain a nano-silver solution. determined, as figure 1 with figure 2 Shown, the average particle diameter of nano-silver solution is 50nm.

Embodiment 2

[0034] The preparation of embodiment 2 nano-silver solution

[0035] Use a silver needle with a diameter of 2mm and a length of 90mm as an electrode, add 200mL of water to a 250mL beaker, weigh 2g of polyvinyl alcohol and dissolve it in the added water under magnetic stirring in a water bath to form a colorless and transparent solution. After the alcohol was completely dissolved, the temperature of the water bath was fixed at 75°C. After the temperature is constant, add a polytetrafluoroethylene stopper with a silver needle electrode fixed on the beaker, keep the distance between the electrodes at 2 cm, and energize for 4 minutes at a DC voltage of 25V to obtain a nano-silver solution. determined, as image 3 with Figure 4 Shown, the average particle diameter of nano-silver solution is 35nm.

Embodiment 3

[0036] The preparation of embodiment 3 nano-silver solution

[0037] Use a silver needle with a diameter of 2mm and a length of 90mm as an electrode, add 200mL of water to a 250mL beaker, weigh 2g of polyvinyl alcohol and dissolve it in the added water under magnetic stirring in a water bath to form a colorless and transparent solution. After the alcohol was completely dissolved, the temperature of the water bath was fixed at 50 °C. After the temperature is constant, add a polytetrafluoroethylene stopper with silver needle electrodes fixed on the beaker, keep the distance between the electrodes at 2cm, and energize for 5min at a DC voltage of 25V to obtain a nano-silver solution. determined, as Figure 5 with Image 6 Shown, the average particle diameter of nano-silver solution is 30nm.

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Abstract

The invention discloses a method for rapidly preparing nano silver with long-time stability and good monodisperse property, and provides a method for preparing nano silver with adjustable size, uniform grain particle and good monodisperse property. The method comprises the following steps: taking two silver needles with the diameter being 2-4mm, and the length being 80-100mm as an electrode, and adopting polyvinyl alcohol solution with the concentration being 5-15g / L, and the volume being 200mL as electrolyte, thus preparing the nano silver with uniform size, wherein the control voltage is 15-30V, and the galvanizing time is 2-10minutes. The nano silver prepared by the method has the advantages of being rapid and simple, high in safety, adjustable in size, long in stable time, being stored without shading and closing, and easy to film after being dried, and realizing the large-scale preparation.

Description

technical field [0001] The invention belongs to the technical field of nano-silver preparation, and in particular relates to a method for preparing a nano-silver solution through electrolysis. Background technique [0002] The good antibacterial effect of nano silver has been widely recognized, and nano silver has been widely studied because of its unique optical, electrical properties and potential catalytic properties. For example, it is used in biological and chemical sensing, surface-enhanced Raman scattering, molecular biology, and electronics. Moreover, nano-silver has excellent electrical conductivity and electrocatalytic properties, and its conductivity is at least 20 times higher than that of ordinary silver; nano-silver not only has a good surface-enhanced Raman scattering effect, but also has surface-enhanced two-photon absorption and fluorescence enhancement. Some optical phenomena related to the surface; nano-silver has a strong catalytic effect due to its smal...

Claims

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Application Information

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IPC IPC(8): C25C5/02C25C1/20
Inventor 顾宁汪清徐丽娜柳东芳柏婷婷
Owner SOUTHEAST UNIV
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