Effects of Fe-AOT complex on the properties of iron oxide particles formed by an AOT isooctane/water emulsion system

J. Oshitani, I. Hatai, M. Yoshida, Kuniaki Gotoh

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Formation of iron oxide particles with aerosol-OT (AOT)/isooctane/water emulsion was carried out employing a coprecipitation reaction for Fe 3O4 particles. Emulsions containing Fe2+/ Fe3+ were mixed with those containing OH-. Iron oxide particles were formed by changing the concentration ratio of AOT to iron ions and maintaining the volume fraction of water in the emulsion at 0.25. Particle formation was also carried out using nonemulsified aqueous solutions as a reference. The morphology, crystal structure, magnetic property and hydration degree of the particles formed under various conditions were compared. The α-FeOOH or amorphous particles are formed instead of Fe3O 4 when the AOT concentration is comparable to, or higher than, the iron ion concentration. These particles contain an OH group and water, and are oxidized to become α-Fe2O3 by heating in N 2. The Fe-AOT complex as the origin of OH-rich particle formation was the focus of this investigation. The IR measurement was carried out for the Fe-AOT complex, separately prepared with the aqueous solution. It was found that the Fe-AOT complex was hydrated, indicating that hydration of the complex affects the properties of particles formed by the emulsion. A possible mechanism for formation of α-FeOOH or amorphous particles with emulsion is proposed.

Original languageEnglish
Pages (from-to)250-254
Number of pages5
JournalAsia-Pacific Journal of Chemical Engineering
Volume3
Issue number3
DOIs
Publication statusPublished - May 2008

Fingerprint

Dioctyl Sulfosuccinic Acid
emulsion
Emulsions
Iron oxides
iron oxide
Particles (particulate matter)
Aerosols
aerosol
Water
Hydration
water
Iron
Ions
hydration
Coprecipitation
aqueous solution
2,2,4-trimethylpentane
ferric oxide
effect
particle

Keywords

  • AOT
  • Emulsions
  • Hydrates
  • Iron oxide
  • Nanotechnology
  • Particles

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

Cite this

Effects of Fe-AOT complex on the properties of iron oxide particles formed by an AOT isooctane/water emulsion system. / Oshitani, J.; Hatai, I.; Yoshida, M.; Gotoh, Kuniaki.

In: Asia-Pacific Journal of Chemical Engineering, Vol. 3, No. 3, 05.2008, p. 250-254.

Research output: Contribution to journalArticle

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