Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지

The Characteristics of Water Based Ferrofluid of Magnetite Prepared by Air Oxidation

공기산화법으로 제조한 Magnetite의 물분산매 자성 유체의 특성

  • 신학기 (경남전문대학 화공과) ;
  • 장현명 (포항공과대학 재료공학과) ;
  • 한창덕 (부산대학교 무기재료공학과) ;
  • 김태옥 (부산대학교 무기재료공학과)
  • Published : 1990.01.01
Download PDF
⟨ Previous Next ⟩

Abstract

Magnetite for Water-based ferrofluid was synthesized by air oxidation of aqueous suspension in the pH range 7-12 at $65^{\circ}C$. The optimum condition of magneite formation was delineated by examining various physicochemcial properties such as Fe2+ content, phase characteristics, MHC and $\sigma$max. The point of zero charge of iron oxide powders obtained at various pH conditions were correlated with the oxidation state of Fe in the iron oxide. The magnetite powder prepared at pH 9 ws dispersed using sodium oleate and sodium dodecylbenzenesulfonate (SDBS) as dispersants, and the dispersion characteristics of the magnetite ferrofluid were examined by means of the fraction of solid dispersed, zeta potential data and FT-IR spectrum. A simple calculation on the potential energy of two interacting magnetite particles showed that the dispersion stability was directly correlated with height of the potential energy barrier or the shape of zeta potential.

Keywords

References

  1. Z. Electrochem. v.63 W. Feightnecht
  2. Bull. Soc. JPN. v.47 Conditions for the Formation of Fe₃O[sub 4] by the Air Oxidation of Fe(OH)₂ Suspensions M. Kiyama
  3. Water Res. v.13 The Fe₃O[sub 4] Formation by the Ferrie Process Oxidation of the Reactive Fe(OH)₂ Suspension induced by Sucrose Y. Tamura;G.S. Chyo;I. Katsura
  4. Corrosion Soc. v.11 The Mechanism of Atomospheric rusting and the Effect of Cu and P on the Rust Formation of Low Alloy Steels T. Misawa;T. Kyumo;W. Suetaka;S. Shimodara
  5. Ferrites no.Sep-Oct Formation of Mg, Zn, Pb, Cr, Ti or V-Bearing Ferrite by Air (NO₃[sum -])Oxidation of Aqueous Suspension Y. Tamura;T. Kanzaki;T. Katsura
  6. Process Chemistry for Water and Wastewater Treatment Larry D. Benefield;Barron L. Weand
  7. Bull. Chem . Soc. v.59 The Zero Point of Charge and the Isoelectric Point of y-Fe₂O₃ and α-Fe₂O₃ H. Watanabe;J. Seto
  8. J. of Coll. Sci. v.19 The Zero Point of Chage of Alpha Alumina J.A. Yopps;D.W. Fuerstenau
  9. IEE Trans. on Magnetics v.16 no.2 Progress in the Development of Ferromagnetic Liquid S.W. Charles;J. Popplewell
  10. J. of the Kor. Institute of Chem. Eng. v.25 no.5 Jeacheon Koh;Jungmin Lee;Bisung Rhee
  11. Colloidal Surfactants K. Shinoda
  12. Introduction to Organic Chemistry(2nd. Edition) A. Streitwieser, jr;C.H. Heathcock
  13. Feraday Disc. Chem. Soc. v.59 Effect of pH on the Adsorption of Sodium Dodecansulfonate at the Alumina/Water Interface D.W. Fuerstenau;T. Waklmatsu
  14. Colloid Science(Vol.1) J. Th. G. Overbeek;H.R. Kruyt(ed.)
  15. Ferromagnetic Materials(Vol.2) S.W. Charles;J. Popplewell;E.P. Wohlfarth(ed.)
  16. J. Colloid Interf. Sci. v.58 Recent Developments in the Understanding of Colloid Stability J.Th.G. Overbeek
  17. Polymeric Stabilization of Colloidal Dispersions D.H. Napper