Surfactant-Water Systems with Small Layer Rigidity Phase Stability, Defects Models and Defects Mobility in Polyoxyethylene Surfactant with Water

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Abstract
Starting from recent experiments in non-ionic surfactants, we discuss various topics characteristic of low rigidity K 1 materials. (1) The stability of the lamellar and cubic phases is studied in a simple model involving K 2 the saddle-splay constant K 2, and entropy terms due to the chains. We expect the lamellar phase to have a large range of existence, and the cubic phase to be of small extent. (2) We compare to cubic phases stability in large K 1 materials. We discuss the mobility of edge dislocations on the basis of a new model of the core which involves stretching of the core layers in one dimension, and easy nucleation of pores in this region. The core extension is a characteristic length of low K 1 materials which is much larger than de Gennes' length for microemulsions with a similar low K 1.
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