<報文>エマルションを利用する超微粒酸化物の分散

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Preparation of a stable aqueous dispersion of fine particles of hematite and magnetite was investigated utilizing an oil (n-decane)-in-water emulsion. The experiment involves (1) preparation of a stable suspension of oxide particles in n-decane (oxide decane suspension) and (2) preparation of oil-in-water (O/W) emulsion using the oxide decane suspension and water in the presence of sodium dodecyl sulfate (SDS) as an emulsifier. In process (1), the oxide decane suspension was prepared by two different methods. First, oxide particles were made hydrophobic with sodium oleate in an aqueous suspension at about pH 6. After dewatering and drying, the oxide particles were dispersed into n-decane. The alternative is dispersing the oxide particles into n-decane with the aid of an oil-soluble surfactant (Aerosol OT). In process (2), O/W emulsion was prepared ultrasonically from a mixture of a hematite decane suspension and water (about 1 : 10 by volume) in the presence of 1×10^<-3> mol/l SDS, whereby the oxide particles were included in the oil particles. Oxide-included O/W emulsions prepared by the sodium oleate method revealed better stability than by the Aerosol OT method, while the more stable oxide decane suspension was available by the latter method. A similar experiment was undertaken in which the O/W emulsion was changed to a microemulsion by the addition of an appropriate amount of n-butanol. However, it was difficult to obtain a stable oxide dispersion, because the oxide fine particles were excluded from the aqueous phase upon the formation of the O/W microemulsion.dispersionultrafine particlesemulsionmicroemulsionn-decanesodium oleateAerosol OT
1990-09-29

<報文>エマルションを利用する超微粒酸化物の分散

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