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Process for production of surface-coated inorganic particles

A technology of surface coating and manufacturing method, which is applied in the field of surface coating inorganic particles, and can solve the problems of chemical instability of coated particles

Inactive Publication Date: 2010-06-30
TOKYO INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, it can be seen that the coated particles have a problem of chemical instability

Method used

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  • Process for production of surface-coated inorganic particles
  • Process for production of surface-coated inorganic particles
  • Process for production of surface-coated inorganic particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093]

[0094] In 180 mg of an octadecene suspension of oleic acid-coated ferrite particles with an average particle size of about 8 nm and a uniform particle size, 5 ml or more of 2-propanol (manufactured by KISHIDA Chemical Co., Ltd.) was added to agglomerate the particles, and then magnetically recovered and discarded. Remove the supernatant. Furthermore, this operation was performed 3 times using 10 ml of 2-propanol. It should be noted that the octadecene suspension of oleic acid-coated ferrite particles used here is prepared by reacting ferric chloride and sodium oleate to prepare iron-oleic acid complex salt. It is obtained by dissolving in octadecene, raising the temperature to 320°C at a certain speed over 90 minutes, reacting at 320°C for 30 minutes, and then cooling to room temperature.

[0095] The 2-propanol was removed, and 16 ml of toluene was added to disperse the particles. 0.324 g of thiomalic acid (manufactured by Tokyo Chemical Industry Co., Ltd., Mw=15...

Embodiment 2

[0101]

[0102] As the temporary coating material in Example 1, 0.737 g of 1-amino-8-naphthol-3,6-sodium disulfonate (manufactured by Tokyo Chemical Industry Co., Ltd., Mw=341.29) was used. 1 The same operation was performed instead of coating the particle surface to obtain a citric acid-coated ferrite particle dispersion.

[0103] The particle size in water of the particle dispersion liquid obtained when 1-amino-8-naphthol-3,6-disulfonate sodium was used as a temporary coating material was measured by a dynamic light scattering method to obtain the size of the particles dispersed in water, Results The particle size in water was 8.0±0.9nm. The obtained particles were observed using TEM, and the average particle diameter was determined, and a value of about 8 nm was obtained. In this particle dispersion liquid, the distribution in terms of particle weight was the largest at around 8 nm, and the particles of about 8 nm in water were in a single-particle dispersed state as in ...

Embodiment 3

[0104]

[0105] As the temporary coating material in Example 1, except that 0.394 g of meso-2,3-dimercaptosuccinic acid (manufactured by Tokyo Chemical Industry Co., Ltd., Mw=182.22) was used, it was replaced by the same operation as in Example 1. The particle surface was coated to obtain a citric acid-coated ferrite particle dispersion. It should be noted that at the stage of the ferrite particle dispersion coated with the meso-2,3-dimercaptosuccinic acid as a temporary coating material, the dispersion was colored and the concentration of iron ions in the ferrite particles was observed. A part dissolves.

[0106] The particle size in water of the particle dispersion liquid obtained when meso-2,3-dimercaptosuccinic acid was used as the temporary coating material was measured by dynamic light scattering method, and the size of the particles dispersed in water was obtained. As a result, the particle size in water was 9.0±4.6nm. The obtained particles were observed using TEM,...

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Abstract

Nano-sized inorganic particles having uniform particle sizes and precisely controlled particle diameters have already been produced by synthesis in an organic solvent, but these nano-sized inorganic particles are hindered from dispersing in a polar solvent because of the adsorption of a long-chain fatty acid on the surfaces of the particles. Further, it was difficult to form nano-sized inorganic particles dispersible in a polar solvent by replacing the long-chain fatty acid coats. According to the invention, various surface-coated inorganic particles dispersible in polar solvents can be produced from fatty acid-coated inorganic particles by adding a temporary coating substance such as thiomalic acid to a nonpolar solvent containing fatty acid-coated inorganic particles dispersed therein to replace the fatty acid coats by the temporary coating substance, dispersing the inorganic particles coated with the temporary coating substance in a polar solvent, and then adding a coating substance dispersible in a polar solvent, e.g., citric acid to the obtained dispersion to replace the temporary coating substance coats covering the inorganic particles by the coating substance dispersible ina polar solvent.

Description

technical field [0001] The present invention relates to a method for producing surface-coated inorganic particles and surface-coated inorganic particles, and more particularly to a surface-coated inorganic substance in which surface-coated inorganic particles are hydrophilic by substituting fatty acid on the surface of hydrophobic inorganic particles coated with fatty acid A method for producing particles, and surface-coated inorganic particles produced by the production method. Background technique [0002] The technology for producing so-called nanocrystal particles with a particle size of several nm to hundreds of nm is advanced, and it is possible to produce nanocrystals of various substances in a single-particle dispersed state. Among them, by synthesizing inorganic particles of metal oxides in an organic solvent, the particle size is precisely controlled, the particle diameter is very uniform, and the single-particle dispersion state of nanocrystals is obtained. Basic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00A61K49/00B22F1/02H01F1/20H01F1/34H01F1/36B22F1/0545B22F1/102
CPCC01P2006/42G01N33/53B82Y30/00C09C3/12B82Y25/00A61K49/1833B22F1/0022A61K49/1836C09C1/24A61K49/1854C01G49/00A61K49/1851B22F1/0062A61K49/183C09C3/08C09C3/10H01F1/0045A61K41/0052G01N33/54393H01F1/0054B22F1/0545B22F1/102
Inventor 半田宏畠山士阿部正纪坂本聪政池由佳西尾广介北善纪岸宽
Owner TOKYO INST OF TECH
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