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Citation:
Zhang Yu-Ting. Effects of Alcohols on the Formation of Uniform Colloidal Particles[J]. Acta Physico-Chimica Sinica,
;1994, 10(01): 50-53.
doi:
10.3866/PKU.WHXB19940112
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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.
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Keywords:
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Alcohols
, - Hydrolysis,
- Supersaturation,
- Nucleation,
- Particle morphology
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