Surface relaxation of lyotropic lamellar phases

H. Bary-Soroker; H. Diamant

doi:10.1209/epl/i2005-10476-4

All issues

Volume 73 / No 6 (March 2006)

Europhys. Lett., 73 6 (2006) 871-877

Abstract

Issue		Europhys. Lett. Volume 73, Number 6, March 2006


Page(s)		871 - 877
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2005-10476-4
Published online		08 February 2006

Europhys. Lett., 73 (6), pp. 871-877 (2006)

Surface relaxation of lyotropic lamellar phases

H. Bary-Soroker¹ and H. Diamant²

¹ School of Physics & Astronomy, Raymond & Beverly Sackler Faculty of Exact Sciences Tel Aviv University - Tel Aviv 69978, Israel
² School of Chemistry, Raymond & Beverly Sackler Faculty of Exact Sciences Tel Aviv University - Tel Aviv 69978, Israel

Corresponding author: hdiamant@tau.ac.il

Received: 19 July 2005
Accepted: 23 January 2006

Abstract

We study the relaxation modes of an interface between a lyotropic lamellar phase and a gas or a simple liquid. The response is found to be qualitatively different from those of both simple liquids and single-component smectic-A liquid crystals. At low rates it is governed by a non-inertial, diffusive mode whose decay rate increases quadratically with wave number, $|\omega|=Aq^2$ . The coefficient A depends on the restoring forces of surface tension, compressibility and bending, while the dissipation is dominated by the so-called slip mechanism, i.e., relative motion of the two components of the phase parallel to the lamellae. This surface mode has a large penetration depth which, for sterically stabilised phases, is of order $(dq^2)^{-1}$ , where d is the microscopic lamellar spacing.

PACS: 61.30.St – Lyotropic phases / 68.03.Kn – Gas-liquid and vacuum-liquid interfaces: Dynamics (capillary waves) / 82.70.Uv – Surfactants, micellar solutions, vesicles, lamellae, amphiphilic systems (hydrophilic and hydrophobic interactions)

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