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Plasma synthesis of titanium dioxide nanopowder and powder doping and surface modification process

A nano-powder, plasma technology, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve problems such as difficult to achieve

Inactive Publication Date: 2004-08-11
TEKNA PLASMA SYST INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, developing a method to produce large quantities of titanium dioxide nanopowders has proven difficult to achieve

Method used

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  • Plasma synthesis of titanium dioxide nanopowder and powder doping and surface modification process
  • Plasma synthesis of titanium dioxide nanopowder and powder doping and surface modification process
  • Plasma synthesis of titanium dioxide nanopowder and powder doping and surface modification process

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Experimental program
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Embodiment approach

[0039] · Also included in TiCl 4 Before injecting the plasma, the TiCl 4 a step of mixing with a dopant;

[0040] · Also includes additional TiCl 4 the step of implanting dopants in the plasma after the reaction of the steam with the oxygen;

[0041] Also includes the additional coating of TiO with dopants 2 The steps of nanopowder.

[0042] Furthermore, according to another more preferred embodiment, an additional step of creating a highly turbulent gas quench zone is included, which includes injecting quench gas into the plasma.

[0043] According to another more preferred embodiment, the step of injecting the quench gas into the plasma comprises: generating jets in various directions having radial and tangential components, thereby creating turbulence of the quench gas.

[0044] Therefore, the method of the present invention advantageously provides the preparation of TiO 2 Nanopowder and TiO treated with suitable dopant or surface treatment agent 2 nanopowder method. ...

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Abstract

A process and apparatus for the synthesis of metal oxide nanopowder from a metal compound vapour is presented. In particular a process and apparatus for the synthesis of TiO2 nanopowder from TiCl4 is disclosed. The metal compound vapour is reacted with an oxidizing gas in electrically induced RF frequency plasma thus forming a metal oxide vapour. The metal oxide vapour is rapidly cooled using a highly turbulent gas quench zone which quickly halts the particle growth process, yielding a substantial reduction in the size of metal oxide particles formed compared with known processes. The metal compound vapour can also react with a doping agent to create a doped metal oxide nanopowder. Additionally, a process and apparatus for the inline synthesis of a coated metal oxide is disclosed wherein the metal oxide particles are coated with a surface agent after being cooled in a highly turbulent gas quench zone.

Description

field of invention [0001] The invention relates to a method and a device for synthesizing metal-containing powders. In particular, but not exclusively, it relates to the oxidation of titanium tetrachloride in the vapor phase by electrically induced plasma, followed by quenching, to synthesize nanoparticle-sized titanium dioxide. The invention also provides an online doping technology for improving the crystal structure and / or surface properties of the metal-containing powder. Background of the invention [0002] Pigments that can affect the light-scattering properties of a coating are usually white or hiding pigments. Due to their high refractive index, which scatter all wavelengths of light, they appear white to the naked eye. The most widely used white pigment is titanium dioxide (TiO 2 ), is a polymorphic substance that exists in three forms or crystal structures, rutile, anatase, and brookite. But only the anatase and rutile forms are of technical or commercial signi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B13/14B01J19/08B01J19/12C01B13/20C01B13/22C01B13/28C01B13/30C01G23/07C09C1/36
CPCC01B13/30C01G23/07C09C1/36B01J2219/0871B01J2219/0879B01J2219/0875C01P2002/50C01P2006/12C01G23/075C09C1/3607C01P2002/72B01J2219/0894C01P2004/64C01P2002/52B82Y30/00C09C1/3669B01J19/088B01J19/129B82B3/00
Inventor 马厄·I·博洛斯杰兹·W·朱尔威茨克里斯廷·A·A·M·内西姆
Owner TEKNA PLASMA SYST INC