Particle comprising core and shell and applications thereof

A particle and application technology, applied in the direction of transportation and packaging, nanotechnology for materials and surface science, fibrous fillers, etc., can solve the problems of no phase conversion, difficulty, and difficulty, and achieve low operating costs and use Simple, low-cost effect

Inactive Publication Date: 2011-01-26
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0033] However, it is currently very difficult or impossible to prepare particles that have a core and shell of different materials; and / or that are small but not too small for some applications, i.e. where the size of the core is preferably greater than 100 nm And preferably less than 100 μm; and / or the particles are stable, for example, do not automatically change over time, do not undergo phase transition, are stable in the use environment, etc.
[0034] In addition, it is difficult or impossible to prepare particles with approximately uniform core size and shell thickness, especially where the shell thickness is small

Method used

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  • Particle comprising core and shell and applications thereof
  • Particle comprising core and shell and applications thereof
  • Particle comprising core and shell and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0127] Example 1 Oxidation of TiN.

[0128] TiN powder in O 2 Heat treatment at 400-600°C for 1 hour. Both 1.45g and 0.25g TiN powders start to oxidize at 500°C. At 600°C the TiN powder is completely oxidized and the existing anatase phase transforms into a rutile phase. 500°C is the most suitable temperature for obtaining the maximum amount of anatase within the range.

[0129] Figure 1 shows the O in the mixed gas 2 (%) Influence on the crystal structure of the oxidized TiN powder. For 0.25 g of TiN powder, anatase is mainly formed at 4–19% O 2 , for 1.45 g of TiN powder, anatase is mainly formed in 2–6% O 2 . According to Figures 1 and 2, containing about 20% by weight (eg 15-25% by weight) of TiO 2 The samples of have anatase as the main phase on the surface of TiN powder.

[0130] Figure 3 shows the effect of the amount of TiN powder on the formation of TiO 2 Quantitative impact. The TiN powder was heated at 500°C for 1 hour in 2 different atmospheres. 5% O in...

Embodiment 2

[0133] Example 2TiN core-TiO 2 The absorption of light by the shell powder.

[0134] Figure 7 is the TiN core-TiO 2 Optical absorption spectrum of shell powder. Made of 4% TiN and 96% TiO 2 It is true that the composed powder absorbs light above UV light (wavelength (λ)2 The composed powder absorbs light below 850nm. Both powders, especially the one with high TiN content, absorb a wide range of visible light (λ > 387 nm).

Embodiment 3

[0135] Example 3TiN core-TiO 2 Photocatalytic activity of shell powders.

[0136]The photocatalytic activity of these powders was evaluated by photodegrading acid orange 7 (AO7), an organic compound commonly used as an azo dye, under a halogen lamp (4002 Shell powder-water solution mix. It is worth noting that azo dyes are generally difficult to break down due to their deliberate design resistance to degradation. However, Figure 8 shows that both powders can degrade AO7 particularly rapidly after one hour of exposure to the halogen lamp. This phenomenon shows the strong photocatalytic activity of the particles of the present invention.

[0137] Photocatalytic reactions strongly depend on the distance from the light source and the surface area of ​​the powder used. Solutions containing low concentrations of powder showed relatively high rates of photodegradation. This can be attributed to a reduction in powder surface area due to agglomeration, or to light scattering by the...

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Abstract

The present invention relates to particles comprising a core and a shell, a method of producing said particle, various uses of said particle as well as various products comprising said particle. The particle according to the invention may be used as photocatalyst, as antibacterial agent, as cleaning agent, as anti-fogging agent and as decomposing agent. Furthermore the particle is applicable as solar cells.

Description

field of invention [0001] The present invention relates to particles comprising a core and a shell, methods of making said particles, uses of said particles and products comprising said particles. Background of the invention [0002] Particles comprising a core and a shell are well known. [0003] US2007 / 187463A1 discloses nano-sized semiconductor particles having a core / shell structure, wherein each particle contains a core and a shell, and exhibits the following characteristics: the average particle size does not exceed 100 nm, and the coefficient of variation of the core size distribution does not exceed 30 %. [0004] However, these particles are typically much smaller than 100 nm and do not contain a conductive core and / or a dielectric or semiconducting shell. [0005] WO 2007 / 086267 A1 discloses semiconductor nanoparticles having a core / shell structure, wherein the ratio of the shell thickness to the particle diameter of the core portion is an optimum value for the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C1/00C09C1/62C09C1/64C09C3/06C09K11/08B01J35/00
CPCC09C1/627C01P2002/84C01P2002/72C09C1/00C09C1/36C01P2006/40C09C1/642B01J35/004C01P2004/04C01P2004/62C09C3/063B82Y30/00C01P2004/61Y10T428/25Y10T428/2991Y10T428/2993
Inventor 古川有纪子奥拉夫·温尼克罗伯图斯·A·M·沃尔特斯耐恩克·维尔哈德
Owner NXP BV
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