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Preparation of minute particle using supercritical fluid; Chorinkai ryutai wo mochiita biryushi no chosei

Journal Article:

Abstract

The metal oxide minute particle synthesis method according to the water-heat reaction in supercritical water was described. Metal salt liquid solution was subjected to hydrolysis when heated to become metal hydroxide but dehydration reaction was generated at a high temperature to generate metal oxide minute particle. Metal salt aqueous solution was supplied to a circulation system unit to contact heated water and was rapidly heated to supercritical state and then was subjected to hydrolysis/dehydration reaction, thus continuously collecting metal oxide minute particles. The hydrolysis speed was in first order for the metal ion concentration and the reaction speed was accelerated by several tens of times when entering supercritical region from subcritical region. When the temperature was rapidly increased to the supercritical state, a radical hydrolysis was generated and a high saturation was instantly reached and minute particles tended to be generated easily since the dissolution force of supercritical water for a product was small. A minute particle with a crystallizability of 5 nm was obtained by synthesizing ceria super-minute particle which was the abrasive of an optical glass material. A single phase of a high magnetization characteristic was synthesized continuously and quickly (faster than a conventional method by two orders  More>>
Authors:
Ajiri, T [1] 
  1. Tohoku University, Sendai (Japan). Faculty of Engineering
Publication Date:
Mar 05, 1995
Product Type:
Journal Article
Reference Number:
SCA: 360201; 400201; PA: NEDO-95:911901; EDB-95:142988; SN: 95001474144
Resource Relation:
Journal Name: Kagaku Kogaku (Chemical Engineering); Journal Volume: 59; Journal Issue: 3; Other Information: PBD: 5 Mar 1995
Subject:
36 MATERIALS SCIENCE; 40 CHEMISTRY; MICROSPHERES; PARTICLES; METALS; OXIDES; SYNTHESIS; HYDROTHERMAL SYNTHESIS; SUPERCRITICAL STATE; FLUIDS; AQUEOUS SOLUTIONS; SALTS; HYDROLYSIS; HYDROXIDES; DEHYDRATION; FLASH HEATING; CHEMICAL REACTION KINETICS; SOLUBILITY; SUPERSATURATION; CERIUM OXIDES; FERRITE; SOLID SOLUTIONS; BARIUM
OSTI ID:
112573
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Journal ID: KKGKA4; ISSN 0375-9253; TRN: 95:911901
Submitting Site:
NEDO
Size:
pp. 19-21
Announcement Date:

Journal Article:

Citation Formats

Ajiri, T. Preparation of minute particle using supercritical fluid; Chorinkai ryutai wo mochiita biryushi no chosei. Japan: N. p., 1995. Web.
Ajiri, T. Preparation of minute particle using supercritical fluid; Chorinkai ryutai wo mochiita biryushi no chosei. Japan.
Ajiri, T. 1995. "Preparation of minute particle using supercritical fluid; Chorinkai ryutai wo mochiita biryushi no chosei." Japan.
@misc{etde_112573,
title = {Preparation of minute particle using supercritical fluid; Chorinkai ryutai wo mochiita biryushi no chosei}
author = {Ajiri, T}
abstractNote = {The metal oxide minute particle synthesis method according to the water-heat reaction in supercritical water was described. Metal salt liquid solution was subjected to hydrolysis when heated to become metal hydroxide but dehydration reaction was generated at a high temperature to generate metal oxide minute particle. Metal salt aqueous solution was supplied to a circulation system unit to contact heated water and was rapidly heated to supercritical state and then was subjected to hydrolysis/dehydration reaction, thus continuously collecting metal oxide minute particles. The hydrolysis speed was in first order for the metal ion concentration and the reaction speed was accelerated by several tens of times when entering supercritical region from subcritical region. When the temperature was rapidly increased to the supercritical state, a radical hydrolysis was generated and a high saturation was instantly reached and minute particles tended to be generated easily since the dissolution force of supercritical water for a product was small. A minute particle with a crystallizability of 5 nm was obtained by synthesizing ceria super-minute particle which was the abrasive of an optical glass material. A single phase of a high magnetization characteristic was synthesized continuously and quickly (faster than a conventional method by two orders or more) in the continuous synthesis of Ba ferrite as a magnetic recording material. 12 refs., 3 figs., 1 tab.}
journal = {Kagaku Kogaku (Chemical Engineering)}
issue = {3}
volume = {59}
journal type = {AC}
place = {Japan}
year = {1995}
month = {Mar}
}