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1988 Fiscal Year Final Research Report Summary

Dispersion of Ultrafine Oxide Particles Utilizing Micromulsion

Research Project

Project/Area Number 62850112
Research Category

Grant-in-Aid for Developmental Scientific Research

Allocation TypeSingle-year Grants
Research Field 資源開発工学
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

USUI Shinnosuke  Research Institute of Mineral Dressing and Metallurgy, Tohoku University, 選鉱製錬研究所, 教授 (90006023)

Co-Investigator(Kenkyū-buntansha) MURAMATSU Atsushi  Research Institute of Mineral Dressing and Metallurgy, Tohoku University, 選鉱製錬研究所, 助手 (40210059)
SUKEGAWA Yuko  Research Institute of Mineral Dressing and Metallurgy, Tohoku University, 選鉱製錬研究所, 助手 (70196781)
Project Period (FY) 1987 – 1988
KeywordsO / W emulsion / Dispersion / Hematite / n-Decane / Sodium oleate / Aerosol OT
Research Abstract

It is of great significance to get stable dispersions of oxide fine particles in aqueous or non-aqueous media. In this study a trial was in which hematite fine particles (median diameter and BET specific surface area being 0.47 um and 5.6 m^2/g, respectively) are stabilized in aqueous media by utilizing O/W emulsions and O/W micro-emulsions. Experiments consist of two steps; 1) stabilization of hematite particles in n-decane and 2) preparation of stable O/W emulsions in which oil droplets contain hematite fine particles. Two different methods were employed to get stable decane suspensions of hematite. One method involves making hematite particles whose surfaces are made hydrophobic by monolayer coating of sodium oleate (Na-Ol) in aqueous media, followed by water washing and drying. The relatively stable hematite decane suspension was obtained with hematite particles which had been treated with 1x10^<-3> M Na-Ol at PH 6 in aqueous hematite suspensions of 1% by weight. Another method inv … More olves dispersing hematite particles directly into n-decane using Aerosol OT in a concentration range of 5x10^<-2> to 1x10^<-1> M. This suspension revealed much better stability than that obtained by Na-Ol method.
O/W emulsion was prepared by ultrasonic method using the hematite decane suspension and water, volume ratio being 1:10, where 1x10^<-3> M sodium dodecyl sulfate (SDS) was used as an emulsifier in both methods. Hematite-included O/W emulsions obtained by the Na-Ol methed revealed stable dispersion even after standing for 7 days or more, while less stability was indicated with those by the Aerosol OT method, in spite of the fact that the latter showed more stable dispersion in n-decane than the former.
O/W micro-emulsions were prepared by adding n-butanol (5-7 ml/20 ml eater) into ordinary O/W emulsion containing 0.5 M SDS. The same procedure was applied as used in preparing the hematite-included O/W emulsion in order to make hematite-included O/W micro emulsion. However, hematite particles included in emulsion droplets were squeezed out of the emulsion droplets and settled down within a short period of time after ordinary O/W emulsion had been changed to micro-emulsion with successive addition of sds. Less

  • Research Products

    (1 results)

All Other

All Publications (1 results)

  • [Publications] 臼井進之助: 資源・素材学会、1989年3月31日.

    • Description
      「研究成果報告書概要(和文)」より

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Published: 1990-12-19  

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