Swelling and shrinking kinetics of a lamellar gel phase
| Autor: | Fairhurst, David J, Baker, Mark E, Shaw, Neil, Egelhaaf, Stefan U. |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Applied Physics Letters, 92, 174105, 2008 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/1.2913762 |
| Popis: | 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. Comment: 3 pages, 4 figures to appear in Applied Physics Letters |
| Databáze: | arXiv |
| Externí odkaz: |
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