Micellar-shape anisometry near isotropic–liquid-crystal phase transitions

R. Itri and L. Q. Amaral
Phys. Rev. E 47, 2551 – Published 1 April 1993; Erratum Phys. Rev. E 58, 1173 (1998)
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Abstract

Micellar phases of the sodium dodecyl (lauryl) sulfate (SLS)–water–decanol system have been studied by x-ray scattering in the isotropic (I) phase, with emphasis on the I→hexagonal (Hα) and I→nematic-cylindrical (Nc) lyotropic liquid-crystal phase transitions. Analysis of the scattering curves is made through modeling of the product P(q)S(q), where P(q) is the micellar form factor and S(q) is the intermicellar interference function, calculated from screened Coulombic repulsion in a mean spherical approximation. Results show that micelles grow more by decanol addition near the INc transition (anisometry ν≃3) than by increased amphiphile concentration in the binary system near the IHα phase transition (ν≃2.4). These results compare well with recent theories for isotropic–liquid-crystal phase transitions.

  • Received 8 September 1992

DOI:https://doi.org/10.1103/PhysRevE.47.2551

©1993 American Physical Society

Erratum

Authors & Affiliations

R. Itri and L. Q. Amaral

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

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Vol. 47, Iss. 4 — April 1993

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