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Spherical and microporous composite zine oxide-SiO2 particles and preparing process and usage thereof

A technology of silica and composite particles, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of low product quality, high cost of ZnO and power consumption It is easy to popularize and apply, easy to prepare, and widely used.

Inactive Publication Date: 2004-03-03
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are some disadvantages, and it is not easy to obtain monodisperse and uniform ZnO particles with controllable particle size.
The direct method uses zinc oxide as a raw material, reduces the zinc oxide to gaseous zinc, and then introduces air to oxidize and shape the product, but the product quality is not high, especially the content of low melting point impurities is high; the indirect method uses zinc ingots As a raw material, zinc vapor is passed into the air to oxidize to obtain zinc oxide, but the cost is high and the total power consumption is large; the liquid phase chemical method uses a soluble metal salt solution to prepare ultrafine powder, but the particle size prepared by the previous liquid phase method is difficult control, difficult to redistribute
[0009] When ZnO particles are used as excellent pigments and some special purposes, it is usually the outer surface of the particles that can actually be utilized and function, while the inner core of the particles does not play a role, so the cost of ZnO in the form of ZnO as the core is high, in fact is a huge waste of resources

Method used

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  • Spherical and microporous composite zine oxide-SiO2 particles and preparing process and usage thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Commercially available SiO with a particle size of about 170 nm 2 Particles are ultrasonically dispersed into an ethanol-water solution with a volume ratio of 2:3, and triethanolamine and zinc acetate solutions with a molar concentration ratio of 33:1 are added dropwise to this mixed solution at the same time to make the silica-triethanolamine- The initial molar ratio of zinc acetate is 22:100:3, and the dropping time is 20 minutes. After heating up to 90°C, the reaction is stirred for 30 minutes, aged for 2.0 hours, and a white turbid solution is obtained, which is centrifuged and vacuum-dried. , to obtain spherical and microporous zinc oxide and silicon dioxide composite particles with a particle size of 190 nanometers, that is, coating zinc oxide particles with a thickness of about 20 nanometers. See attached figure 1 .

Embodiment 2

[0038] In the dispersed silicon dioxide (particle size is 500 nanometers) ethanol-water mixed solution, at the same time, double-injection drips triethanolamine and zinc acetate solution with a molar concentration ratio of 66:1 to make silicon dioxide-triethanolamine-acetic acid The initial molar ratio of zinc is 11:300:8, and the dropping time is 80 minutes. After the temperature is raised to 85° C., the reaction is stirred for 90 minutes, aged for 8.0 hours, and a white turbid solution is obtained, which is centrifuged, and the obtained centrifuged product is vacuum-dried. Composite particles of zinc oxide and silicon dioxide with a spherical shape and micropores were obtained, with a particle diameter of 560 nanometers, that is, zinc oxide particles coated with a thickness of about 60 nanometers.

Embodiment 3

[0040] (1). 0.2 g of the particles prepared according to Example 1 were ultrasonically dispersed into a 1:1 mixed solvent of ethanol-water.

[0041] (2). Simultaneously double-injection dripping molar concentration ratio is 66: 1 triethanolamine and zinc acetate solution again, makes the initial molar ratio of silicon dioxide-triethanolamine-zinc acetate be 11: 100: 2, and its dropping time is For 40 minutes, heat up to 80°C and react under stirring for 90 minutes, age for 6.0 hours to obtain a white turbid solution, centrifuge, and vacuum-dry the obtained centrifuged product to obtain spherical and microporous zinc oxide and silicon dioxide composite particles , with a particle size of 220 nanometers, that is, zinc oxide particles coated with a thickness of about 50 nanometers.

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Abstract

A composite particle material containing spherical and miniporous zine oxide and SiO2 is prepared through such steps as dispersing SiO2 particles in the alcohol-water mixed solvent, preparing the aqueous solution of zine salt, preparing the aqueous solution of hydramine compound, adding the last two solutions to the first one, ageing, and centrifugal separation. The said material can be used for photon crystal assembly, electrorheopectic material and high-grade paint.

Description

technical field [0001] The invention belongs to the field of semiconductor inorganic nanomaterials, in particular to spherical and microporous zinc oxide (ZnO) and silicon dioxide (SiO 2 ) composite particle and its preparation method and application. Background technique [0002] ZnO, commonly known as zinc white, is a highly functional fine inorganic material that has been studied more. It is an important ceramic, semiconductor and catalytic material, and nano-ZnO is widely used due to its excellent optical, electrical, chemical and biological effects. Used in chemical industry, electronics, biology, coatings, sensors, dielectric materials, plastics, ink, paper, chemical fiber, rubber and other fields, such as: [0003] (1) Application in cosmetics—a new type of sunscreen and antibacterial agent. In recent years, various countries have actively carried out research and development of sunscreen agents. Such as ZnO, TiO 2 Sunscreen agents such as a bat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/06B01J37/02C04B35/628C09C1/04C09C3/00
Inventor 唐芳琼夏海龙
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI