Acta Phys. -Chim. Sin. ›› 1994, Vol. 10 ›› Issue (01): 50-53.doi: 10.3866/PKU.WHXB19940112

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Effects of Alcohols on the Formation of Uniform Colloidal Particles

Zhang Yu-Ting   

  1. Tianjin College of Textile Technology, Tianjin 300160
  • Received:1992-05-21 Revised:1992-09-15 Published:1994-01-15
  • Contact: Zhang Yu-Ting

Abstract:

Alcohols extremely affect the formation of uniform colloidal particles in the hydrolysis of ferric ions for Fe(NO_3)_3-HNO_3 system. The affecting ability of the alcohols decreases by the order: 2-propanol, ethanol, t-butylalcohol, 1-propanol and n-butanol. The uniform colloidal particles could prepare in the aging solutions containing lower concentration of Fe(NO_3)_3 and higher concentration of HNO_3 in the presence of alcohols comparing with that in the absence of alcohols. The shapes and sizes of the particles formed depend not only on the concentrations of Fe(NO_3)_3 and HNO_3, but also the content of alcohols. In general, lower saturation of precipitating species favours the formation of spherical particles, and high saturation for the elliptic ones.

Key words: Alcohols, Hydrolysis, Supersaturation, Nucleation, Particle morphology