Volume 84, Number 4, November 2008
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||10 November 2008|
The effect of curvature and topology on membrane hydrodynamics
Department of Chemistry and Biochemistry, University of California - Los Angeles, CA 90095, USA
2 Department of Physics, University of Massachusetts - Amherst, MA 01003, USA
3 Department of Physics, Harvard University - Cambridge, MA 02138, USA
4 School of Physics, The University of Edinburgh - Edinburgh EH9 3JZ, UK, EU
5 California Nanosystems Institute, University of California - Los Angeles, CA 90095, USA
Accepted: 5 October 2008
We study the mobilities of point-like and extended objects (rods) on a spherical membrane to show how these quantities are modified in a striking manner by the curvature and topology of the membrane. We also present theoretical calculations and experimental measurements of the membrane fluid velocity field around a moving rod bound to the crowded interface of a water-in-oil droplet. By using different droplet sizes, membrane viscosities, and rod lengths, we show that the viscosity mismatch between the interior and exterior fluids leads to a suppression of the fluid flow on small droplets that cannot be captured by the flat-membrane predictions.
PACS: 87.16.dp – Transport, including channels, pores, and lateral diffusion / 47.63.-b – Biological fluid dynamics / 68.05.-n – Liquid-liquid interfaces
© EPLA, 2008
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