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Science 6 April 1990:
Vol. 248. no. 4951, pp. 52 - 56
DOI: 10.1126/science.2321026
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Articles

Science, Vol 248, Issue 4951, 52-56
Copyright © 1990 by American Association for the Advancement of Science

articles

Diffuse-double layer at a membrane-aqueous interface measured with x-ray standing waves

MJ Bedzyk, GM Bommarito, M Caffrey, and TL Penner

Cornell High Energy Synchrotron Source, Cornell University, Ithaca, NY 14853.

The ion distribution in an electrolyte solution in contact with a charged polymerized phospholipid membrane was directly measured with long-period x-ray standing waves. The 27-angstrom-thick lipid monolayer was supported on a tungsten/silicon mirror. X-ray standing waves were generated above the mirror surface by total external reflection of a 9.8-kiloelectron volt x-ray beam from a synchrotron undulator. The membrane surface, which contained negatively charged phosphate headgroups, was bathed in a dilute ZnCl2 solution. The concentration of Zn2+ in the condensed layer at the membrane surface and the Zn2+ distribution in the diffuse layer were measured as a function of headgroup charge. The Debye length of the diffuse layer varied between 3 and 58 angstroms. The results qualitatively agree with the Gouy-Chapman-Stern model.


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