Small-angle scattering features of lyotropic smectics A

Issue		J. Phys. France Volume 51, Number 20, octobre 1990


Page(s)		2333 - 2346
DOI		10.1051/jphys:0199000510200233300

J. Phys. France 51, 2333-2346 (1990)
DOI: 10.1051/jphys:0199000510200233300

Small-angle scattering features of lyotropic smectics A

F. Nallet¹, D. Roux¹ et S.T. Milner²

¹ CNRS, Centre de recherche Paul-Pascal, avenue du Docteur-Schweitzer, F-33600 Pessac, France
² Corporate Research Science Laboratories, Exxon Research and Engineering Company, Annandale, NJ 08801, USA

Abstract
Small-angle neutron scattering experiments on dilute lyotropic smectics A have been performed on oriented samples. The structure factor of a two-component smectic A is derived theoretically, taking explicitly into account the anisotropic coupling between concentration and layer displacement fluctuations. The anisotropic small-angle signal and other characteristic features of the spectra, and their evolutions with dilution, are predicted. The differences between electrostatically and sterically stabilized dilute lamellar phases are emphasized. Experiments are consistently described by the theory.

Résumé
La phase smectique A lyotrope diluée a été étudiée par une expérience de diffusion de neutrons aux petits angles réalisée sur des échantillons orientés. Le facteur de structure d'un smectique A binaire est établi théoriquement en considérant explicitement le couplage anisotrope entre les fluctuations de concentration et celles de déplacement des couches. La diffusion aux petits angles ainsi que d'autres caractéristiques remarquables des spectres, de même que leur devenir au cours de la dilution, sont prévus. L'accent est mis sur les différences entre phases lamellaires diluées suivant que leur stabilité a pour cause l'interaction électrostatique non amoindrie ou l'interaction stérique d'ondulation. La théorie fournit un cadre cohérent pour l'interprétation de l'éxperience.

PACS
6130E - Experimental determinations of smectic, nematic, cholesteric, and other structures.

Key words
neutron diffraction examination of liquids -- smectic liquid crystals

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