Electro-osmosis at the surface of phospholipid bilayer membranes |
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Authors: | Angarai Balasubramanian Stuart McLaughlin |
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Affiliation: | Department of Physiology and Biophysics, Health Sciences Center, State University of New York, Stony Brook, NY 11794 U.S.A. |
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Abstract: | The electro-osmotic velocity is the velocity of a fluid near an interface produced by an electric field parallel to a surface. The velocity adjacent to fixed phospholipid bilayer membranes was measured by observing the velocity of small vesicles suspended in the fluid. The charge densities of the bilayers ranged from 0 to 1 electronic charge per lipid and experiments were performed at temperatures above and below the transition temperature of the phospholipid bilayer in 1, 10 and 100 mM NaCl solutions. The Helmholtz-Smoluchowski equation correctly predicted the electro-osmotic velocity from the known value of zeta potential of the phospholipid bilayer. |
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Keywords: | Phospholipid bilayer Electro-osmotic velocity Charge density DMPC DMPG Mops |
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