Acta Phys. -Chim. Sin. ›› 1997, Vol. 13 ›› Issue (06): 564-568.doi: 10.3866/PKU.WHXB19970616

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Inflence of Phase Transformation on the Morphology and Aggregation of Uniform Colloidal Particles

Wei Yu,He Hui-Lan,Liu Xiao-Lin,Zheng Xue-Zhong   

  1. Department of Chemistry,Hebei Normal Universtiy,Shijiazhuang 050016
  • Received:1996-09-16 Revised:1996-12-05 Published:1997-06-15
  • Contact: Wei Yu

Abstract:

The inflence of the additives, NaH2PO4 and 1-hydroxyethylidene-1,1'-diphosphonic acid (HEDP), the concentration of HNO3 and the temperature of reaction on the phase transformation and aggregation of Fe2O3 particles obtained by the boiling reflux of 0.2mol-1 Fe(NO3)3 solution has been studied using TEM and XRD. Phosphate gave monodispersed spindle-shaped α-Fe2O3 perticles used as magnetic recording material. Nanowhiskers of α-Fe2O3 was formed in the presence of HEDP and HNO3. The method is provisionally referred to as the inhibitory subcrystal aggregation method.

Key words: Phase transformation, Uniform colloidal particle, Aggregation