Preparation of monodisperse peanut-type α-Fe2O3 particles from condensed ferric hydroxide gel

Tadao Sugimoto, Mohammad M. Khan, Atsushi Muramatsu

Research output: Contribution to journalArticlepeer-review

154 Citations (Scopus)


Recently, it has been found that monodisperse pseudocubic hematite particles 1.65 μm in mean edge length can be obtained in large quantities of the order of the molality with a yield close to 100%, by adding 100 ml of 5.4 N NaOH to 100 ml of well-stirred 2.0 M FeCl3 and aging the resulting condensed gel of Fe(OH)3 for 8 days at 100°C. The method was provisionally referred to as the gel-sol method. As an application of this technique, when 90 ml of 6.0 N NaOH and 10 ml of sulfate or phosphate solution were added instead of 100 ml of 5.4 N NaOH, the pseudocubic particles turned into peanut-type particles via an ellipsoidal shape with increasing concentration of the additives.

Original languageEnglish
Pages (from-to)167-169
Number of pages3
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Issue number2
Publication statusPublished - 1993 Mar 17


  • Ferric hydroxide
  • gel-sol method
  • hematite particles
  • monodisperse colloid
  • monodisperse particles.

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry


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