Nonionic surfactant systems above the PIT Part I. Phase behaviour

Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 73)


“New Trends in Colliod Science” contains the proceedings of the foundation meeting of the European Colloid and Interface Society (ECIS), October 1–3, 1986. Representatives from the major European groups working in this field contributed to the conference. The volume contains an up-to-date account of present developments in Colloid Science. The contributions cover a wide scope of subjects, and provide encouragement that structures and transport processes in dense colloidal systems can be understood on basic principles. The main subjects are include:
  • phase diagrams of new surfactant systems

  • microemulsions and their applications

  • vesicles and bilayers

  • transport properties of colloidal systems.


Just above the PIT for long nonionic amphiphiles CmEOn, the surfactant phase region (microemulsion area) and the water-poor domain tend to constitute a single oneisotropic phase region. According to the chemical nature of the oil (the third component), this phase domain coalescence takes place either directly toward the oil corner or for much larger surfactant/oil ratios, and give rise to typical phase diagram outlooks. Therefore, for intermediate water/surfactant ratio, a gap of solubility exists respectively for low or large oil contents, i. e. the molecular structures can be stable only in dilute or in concentrated solutions. The results are discussed in terms of the length/bulkiness and free volume of the oil molecules. We have also noted the absence of direct correlation between water solubilization and binary apolar phase behaviour.

Key words

Nonionic surfactant phase behaviour free volume 


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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1987

Authors and Affiliations

  1. 1.Laboratoire de Physico-Chimie des Colloides UA 406 CNRS LESOCUniversité de Nancy I, Centre de 2éme cycle Faculte des SciencesVandoeuvre-lès-Nancy CedexFrance

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