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Method and device for preparing ZnO nano-particles by external electric-field induction

A nanoparticle and external electric field technology, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problems of poor crystallization effect and adjust product morphology, and achieve the effects of low cost, convenient control and low equipment requirements.

Inactive Publication Date: 2012-08-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing technology cannot conveniently and quickly adjust the morphology of the product, and the crystallization effect is poor

Method used

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  • Method and device for preparing ZnO nano-particles by external electric-field induction
  • Method and device for preparing ZnO nano-particles by external electric-field induction
  • Method and device for preparing ZnO nano-particles by external electric-field induction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Place 100mL of 0.2mol / L NaOH solution in reaction vessel 2, heat the constant temperature water bath 1 to a predetermined temperature of 80°C, and drop 120mL of 0.1mol / L zinc acetate solution from the addition funnel 3 at a rate of 6mL / min. Into the NaOH solution, use the adjustable speed stirrer 4 to stir at a constant speed, and at the same time turn on the high-voltage electrostatic generator 7 to generate an electric field (the electric field strength is 50KV), and the zinc salt aqueous solution is added dropwise to complete the reaction. The temperature is maintained in the water bath for 4 hours. After 4 hours of reaction, a milky white suspension was obtained, and then the milky white suspension was washed with deionized water for 5 times, and then washed with ethanol for 5 times, centrifuged, and vacuum dried at 60°C for 24 hours to obtain a sample ---ZnO nanoparticles . Such as figure 2 As shown, the morphology of the obtained product is a long columnar structu...

Embodiment 2

[0035] Place 100mL of 0.2mol / L NaOH solution in reaction vessel 2, heat the constant temperature water bath 1 to a predetermined temperature of 80°C, and drop 120mL of 0.1mol / L zinc acetate solution from the addition funnel 3 at a rate of 6mL / min. Into the NaOH solution, use the adjustable speed stirrer 4 to stir at a constant speed, the high-voltage electrostatic generator 7 is not energized, and the zinc salt aqueous solution is added dropwise to complete the reaction. The temperature is kept in the water bath for 4 hours. After 4 hours of reaction, a milky white suspension was obtained, and then the milky white suspension was washed with deionized water for 5 times, and then washed with ethanol for 5 times, centrifuged, and vacuum dried at 60°C for 24 hours to obtain a sample ---ZnO nanoparticles . Such as image 3 As shown, the morphology of the obtained product is a long columnar structure and a stacked flake structure, with some irregular polyhedral particles in the middl...

Embodiment 3

[0037] Place 100 mL of 1.5 mol / L NaOH solution in reaction vessel 2, heat the constant temperature water bath 1 to a predetermined temperature of 80°C, and drop 120 mL of 0.1 mol / L zinc acetate solution from the addition funnel 3 at a rate of 6 mL / min. Into the NaOH solution, use the adjustable speed stirrer 4 to stir at a constant speed, and at the same time turn on the high-voltage electrostatic generator 7 to generate an electric field (the electric field strength is 50KV), and the zinc salt aqueous solution is added dropwise to complete the reaction. The temperature is maintained in the water bath for 4 hours. After 4 hours of reaction, a milky white suspension was obtained, and then the milky white suspension was washed with deionized water for 5 times, and then washed with ethanol for 5 times, centrifuged, and vacuum dried at 60°C for 24 hours to obtain a sample ---ZnO nanoparticles . Such as Figure 4 As shown, the morphology of the obtained product is mostly a nano-flow...

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Abstract

The invention provides a method and a device for preparing ZnO nano-particles by external electric-field induction. The method comprises the following steps of: adding a NaOH solution into a reaction vessel under a constant-temperature water bath; constantly applying an external electric field to the reaction vessel; dripping a zinc acetate (Zn(Ac)2.2H2O) solution into the NaOH solution and mixing at the same time; insulating the heat of the solution water bath for a period of time after finishing the dripping step; centrifugally separating powder after finishing the reaction; drying the powder after being washing 5 times; and obtaining the nano zinc-oxide powder. The device comprises the constant-temperature water bath, the reaction vessel for containing reactants, a feed hopper, an adjustable-speed stirrer, two parallel electrodes and a high-voltage electrostatic generator. The device has the advantages of low equipment requirement, low cost, simple operation, high utilization efficiency and short reaction time.

Description

Technical field [0001] The invention belongs to the field of nano-material preparation, and specifically relates to a method and a device for preparing ZnO nano-particles induced by an external electric field. Background technique [0002] Nano-zinc oxide (ZnO) is a new type of multifunctional inorganic material. Due to its small particle size, large specific surface area, and obvious surface and interface effects, it has many unique advantages in chemistry, optics, biology and electricity. The physical and chemical properties. Nano zinc oxide has a wide range of uses. At present, there are many research reports on nano-ZnO at home and abroad. In the fine ceramic industry, the use of nano-ZnO's antibacterial, deodorizing and organic decomposition properties can be used to prepare high-end sanitary ceramic sanitary ware. With the function of shielding ultraviolet rays, adding nano-ZnO in daily cosmetics has a good skin care and beauty effect. Taking advantage of the large speci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G9/02
Inventor 梁秀娟胡小芳胡大为嵇海旭翁星星
Owner SOUTH CHINA UNIV OF TECH
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