Micellar hexagonal phases in lyotropic liquid crystals

L. Q. Amaral, A. Gulik, R. Itri, and P. Mariani
Phys. Rev. A 46, 3548 – Published 1 September 1992
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Abstract

The hexagonal cell parameter a of the system sodium dodecyl lauryl sulfate and water as a function of volume concentration cv in phase Hα shows the functional behavior expected for micelles of finite length: acv1/3. The interpretation of x-ray data based on finite micelles leads to an alternative description of the hexagonal phase Hα: spherocylindrical micelles of constant radius with length that may grow along the range of the Hα phase. Results are compared with recent statistical-mechanical calculations for the isotropic I-Hα transition. The absence of diffraction in the direction perpendicular to the hexagonal plane is ascribed to polydispersity of micellar length, which also is a necessary condition for the occurrence of direct I-Hα transitions.

  • Received 13 December 1991

DOI:https://doi.org/10.1103/PhysRevA.46.3548

©1992 American Physical Society

Authors & Affiliations

L. Q. Amaral

  • Instituto de Física, Universidade de São Paulo, Caixa Postal 20516, 01498 São Paulo, Brazil

A. Gulik

  • Centre de Genetique Moleculaire, 91198 Gif-sur-Yvette, France

R. Itri

  • Instituto de Física, Universidade de São Paulo, Caixa Postal 20516, 01498 São Paulo, Brazil

P. Mariani

  • Istituto di Física Medica, Universitá di Ancona, I-60131 Ancona, Italy

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Vol. 46, Iss. 6 — September 1992

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