Structure Factor of a Lamellar Smectic Phase with Inclusions

Details Structure Factor of a Lamellar Smectic Phase with Inclusions Structure Factor of a Lamellar Smectic Phase with Inclusions

2000-03-09

arxiv.org/abs/cond-mat/0003154v1

Physics

Condensed Matter

Soft Condensed Matter

11 pages, 2 figures

Scientific paper

10.1007/s101890170149

Motivated by numerous X-ray scattering studies of lamellar phases with membrane proteins, amphiphilic peptides, polymers, or other inclusions, we have determined the modifications of the classical Caille law for a smectic phase as a function of the nature and concentration of inclusions added to it. Besides a fundamental interest on the behavior of fluctuating systems with inclusions, a precise characterization of the action of a given protein on a lipid membrane (anchoring, swelling, stiffening ...) is of direct biological interest and could be probed by way of X-ray measurements. As a first step we consider three different couplings involving local pinching (or swelling), stiffening or tilt of the membrane. In the first two cases we predict that independent inclusions induce a simple renormalization of the bending and compression modulii of the smectic phase. The X-ray experiments may also be used to probe correlations between inclusions. Finally we show that asymmetric coupling (such as a local tilt of the membrane) results in a modification of the usual Caille law.

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