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신학기,신세건 한국환경과학회 2003 한국환경과학회지 Vol.12 No.1
Magnetite powder for kerosene-based ferrofluid was synthesize by air oxidation of waste acid containing Fe^2^+ and Fe^3^+ ions in the ph=11 at 60℃. stable kerosen-based ferrofluid was prepared by addition of polyoxyethylene nonyphencyl ether(POENPE) to the magnetite was examined by means of the fractionof solid dispersed FT-IR spectrum of an addition POENPE to the magnetite was examined by means of the fraction of solid dispersed FT-IR spectrum. And magnetic properties of kerosen-based ferrofluid were examined by method of Vibrating Sample Magnetometer. In order to oil on the water surface by an addition of kerosen-based ferrofluid, the optimum conditions were examined.
Steric Stabilization에 의한 석유분산매 자성유체의 제조
신학기,장현명,김태옥 한국세라믹학회 1990 한국세라믹학회지 Vol.27 No.5
Ultrafine magnetite powder for the ferromagnetic fluid was prepared by an addition of alkaline solution to the solution containing Fe2+ and Fe3+ ions at 6$0^{\circ}C$. The optimum condition of the magnetite synthesis was delineated by examining such various physico-chemical properties as Fe2+/Fe+3 ratio in the powder, phase characteristics, MHC and $\sigma$max. A new scheme for the steric stabilization of colloidal dispersion was proposed using the concept of the buffer group action for the increased interfacial density of the stabilizing moieties at colloid particle/dispersion medium interface. The proposed concept was successfully applied to the preparation of the kinetically stable kerosinebased ferrofluid using Tween and Span as dispersants. In the dispersion of magnetite particles in a kerosine, Tween(polyoxyethylene sorbitan oleate) acts as a primary stabilizer which provides an anchor group, whereas Span(sorbitan oleate) can be classified as a secondary stabilizer which adsorbs on the surface of magnetite particle through the action of the buffer group. Dispersion studies using various quantities of Tween and Span supported the concept of the buffer group action for increased dispersion characteristics of the kerosine based ferromagnetic fluid.