Acta Phys. -Chim. Sin. ›› 1995, Vol. 11 ›› Issue (09): 831-835.doi: 10.3866/PKU.WHXB19950914

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Liquid Crystal and Spontaneous Emulsification in Nonionic Surfactant System(I)

Dai Le-Rong,Su Xiao-Yan   

  1. Institute of Physical Chemistry,Peking University,Beijing 100871
  • Received:1994-07-13 Revised:1994-11-29 Published:1995-09-15
  • Contact: Dai Le-Rong


The formation and structure of liquid crystal in Tween 80, Tween 85, Tween 85-Span 80 and H2O systems were studied. At room temperature, the results of low angle X-ray diffraction showed that hexagonal liquid crystal was formed in Tween 80-H2O system, whereas in Tween 85- H2O and Tween 80-Span 80 (7:3)-H2O systems lamellar liquid crystal was formed. In two lamellar crystal phases the thickness of amphiphilic layer was 66.8Å and 68.0Å respectively. The penetration of water in Tween 85 liquid crystal phase was higher than in Tween 80-Span 80 liquid crystal phase.

Key words: Nonionic surfactant, Lyotropic liquid crystal