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.
|Number of pages||3|
|Journal||Colloids and Surfaces A: Physicochemical and Engineering Aspects|
|Publication status||Published - 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