Swelling and shrinking kinetics of a lamellar gel phase

Details Swelling and shrinking kinetics of a lamellar gel phase Swelling and shrinking kinetics of a lamellar gel phase

2008-04-07

arxiv.org/abs/0804.1052v1

Applied Physics Letters, 92, 174105, 2008

Physics

Condensed Matter

Soft Condensed Matter

3 pages, 4 figures to appear in Applied Physics Letters

Scientific paper

10.1063/1.2913762

We investigate the swelling and shrinking of L_beta lamellar gel phases composed of surfactant and fatty alcohol after contact with aqueous poly(ethylene-glycol) solutions. The height change $\Delta h(t)$ is diffusion-like with a swelling coefficient, S: $\Delta h = S \sqrt{t}$. On increasing polymer concentration we observe sequentially slower swelling, absence of swelling, and finally shrinking of the lamellar phase. This behavior is summarized in a non-equilibrium diagram and the composition dependence of S quantitatively described by a generic model. We find a diffusion coefficient, the only free parameter, consistent with previous measurements.

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