Acta Phys. -Chim. Sin. ›› 1997, Vol. 13 ›› Issue (05): 395-400.doi: 10.3866/PKU.WHXB19970503

• ARTICLE • Previous Articles     Next Articles

Self-Induced Complex Interfacial Instability in the System of 2-Butanol/Water/Nitroethane

Hu Xue-Zheng,Yu Xue-Jun,Liu Jun-Kang,Vignes-Adler M   

  1. Department of Chemical Engineering,Wuxi University of Light Industry,Wuxi 214036|Vignes-Adler M(CNRS,FRANCE)
  • Received:1996-08-15 Revised:1996-12-10 Published:1997-05-15
  • Contact: Hu Xue-Zheng

Abstract:

A complex solute Marangoni instability phenomena is observed by analysing the motion of a nitroethane droplet located at the surface of an aqueous solution of 2-butanol. It is shown that the motion in the first five minutes is composed of three successive phases with different dynamic properties-oscillatory, stationary and spiral.
A self-induced complex mechanism is used to explain this phenomena. It is proposed that the basic origin of this instability is the transfer of the surface-active 2-butanol, but this transfer diminishes the subsurface concentration of 2-butanol in the aqueous phase and induces the restoration of the equilibrium of mutual solubility of the two solvents-nitroethane and water, which has a complex effect on this interfacial phenomena.

Key words: Interfacial instability, Marangoni effect, Interfacial tension gradient, 2-butanol;Nitroethane