Myelin figures: the buckling and flow of wet soap

Details Myelin figures: the buckling and flow of wet soap Myelin figures: the buckling and flow of wet soap

2009-03-28

arxiv.org/abs/0903.4927v2

Phys. Rev. E 79, 061502 (2009)

Physics

Condensed Matter

Soft Condensed Matter

11 pages, 10 figures, to appear in Phys. Rev. E. Corrected figures/typos

Scientific paper

10.1103/PhysRevE.79.061502

Myelin figures are interfacial structures formed when certain surfactants swell in excess water. Here, I present data and model calculations suggesting myelin formation and growth is due to the fluid flow of surfactant, driven by the hydration gradient at the dry surfactant/water interface; a simple model based on this idea qualitatively reproduces the various myelin growth behaviors observed in different experiments. From a detailed experimental observation of how myelins develop from a planar precursor structure, I identify a mechanical instability that may underlie myelin formation. These results indicate the mixed mechanical character of the surfactant lamellar structure, where fluid and elastic properties coexist, is what enables the formation and growth of myelins.

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