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Monodisperse pure rutile type or rutile type and anatase type composite phase titanic oxide hollow sub-micron ball and preparation method

A titanium dioxide, anatase type technology, applied in the field of nanomaterials, can solve the problems of discoloration of organic dye molecules, poor stability of white pigments, high density of white pigments, etc., and achieves the effects of mild conditions, controllable product size, and easy synthesis.

Inactive Publication Date: 2011-07-27
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the anatase-based titanium dioxide hollow spheres obtained by the above method can well solve the problem that the density of the white pigment is too large, but due to the A-TiO 2 The light stability is too poor, which often leads to the discoloration of organic dye molecules
Therefore, in order to better solve the problem of poor stability of white pigments, pure R-TiO 2 The synthesis of hollow submicron spheres is currently a great challenge

Method used

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  • Monodisperse pure rutile type or rutile type and anatase type composite phase titanic oxide hollow sub-micron ball and preparation method
  • Monodisperse pure rutile type or rutile type and anatase type composite phase titanic oxide hollow sub-micron ball and preparation method

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Effect test

Embodiment 1

[0039] (1). Monodisperse PS / TiO was prepared by the method in the invention patent application number: 200610011885.0 2 Submicron spheres, approximately 350nm in size. PS spheres with cores of 240 nm, TiO2 composed of titania nanoparticles 2 The shell thickness is 55nm.

[0040] (2). Disperse the colloidal particles coated with titanium dioxide on the surface of polystyrene microspheres obtained in step (1) into deionized water, the concentration range can be 1-50g / L, and transfer it to the hydrothermal reaction kettle after magnetic stirring , reacted at 80 °C for 24 hours, and its shell was composed of anatase-structured TiO nanoparticles. The obtained samples were centrifuged, dried and stored for further operation. Its crystal structure and morphology are as figure 1 , as shown in 2, the outer shell is composed of anatase structure titanium dioxide nanoparticles with a size of 5-50 nm, and the inner core is PS spheres. Since the amorphous titanium dioxide becomes nano...

Embodiment 2

[0043] (1). Monodisperse PS / TiO was prepared by the method in the invention patent application number: 200610011885.0 2 submicron spheres.

[0044] (2). The sample obtained in step (1) was sintered in a tube furnace at 900° C. for 2 hours, and then cooled to room temperature. The obtained sample is monodispersed, smooth and compact titanium dioxide hollow submicron spheres, and the mass content of rutile is 100%. It looks like Figure 5 Shown (the small figure is the local enlarged view of the obtained titanium dioxide hollow submicron sphere with smooth and compact surface). The size of the whole titanium dioxide hollow submicron sphere is about 315nm, and the inner cavity size is about 235nm. The density of titanium dioxide hollow submicron spheres is about 2.5g / cm 3 .

Embodiment 3

[0046] (1). Monodisperse PS / TiO was prepared by the method in the invention patent application number: 200610011885.0 2 submicron spheres.

[0047] (2). The sample obtained in step (1) was sintered in a tube furnace at 700° C. for 4 hours, and then cooled to room temperature. The obtained sample is monodisperse, smooth and dense titanium dioxide hollow submicron spheres, and the mass content of rutile is 50%.

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Abstract

The invention belongs to the field of nano-materials, and relates to monodisperse pure rutile type or rutile type and anatase type compound phase titanium dioxide hollow submicron spheres and submicron spheres with monodisperse and kernel / shell structure formed by polystyrene spheres wrapped by anatase type titanium dioxide nano particles. The submicron spheres with kernel / shell structure formed by polystyrene spheres wrapped by anatase type titanium dioxide nano particles are obtained by performing hydro-thermal treatment on PS / TiO2 submicron spheres, and then monodisperse pure rutile type or rutile type and anatase type compound phase titanium dioxide hollow submicron spheres with rough surfaces are obtained by high temperature sintering. By direct high temperature sintering, PS / TiO2 submicron spheres are synthesized into monodisperse pure rutile type or rutile type and anatase type compound phase titanium dioxide hollow submicron spheres with smooth and compact surfaces. The titanium dioxide hollow submicron spheres can be broadly applied in the fields of coating, sensors, chemical fiber, printing ink, functional ceramics, electronic paper, drug release and the like.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, in particular to monodisperse pure rutile type or rutile type and anatase type titanium dioxide hollow submicron spheres; Dispersed, core / shell structured submicron spheres. Background technique [0002] Titanium dioxide, commonly known as titanium dioxide, is one of the most important products of the titanium series, including anatase (hereinafter referred to as type A), brookite (hereinafter referred to as type B) and rutile (rutile, Hereinafter referred to as R type) three crystal forms. Type B titanium dioxide belongs to the orthorhombic crystal system, while titanium dioxide with A and R structures belongs to the tetragonal crystal system. Generally speaking, R-type titanium dioxide is a thermodynamically stable phase, while A-type is a metastable phase, and the phase transition from A to R is an irreversible phase transition from a metastable phase to a stable phase. The initial ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/047B82B3/00
Inventor 唐芳琼郑荣波孟宪伟陈东
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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