Abstract
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 language | English |
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Pages (from-to) | 167-169 |
Number of pages | 3 |
Journal | Colloids and Surfaces A: Physicochemical and Engineering Aspects |
Volume | 70 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1993 Mar 17 |
Keywords
- 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