Volume 79, Number 1, July 2007
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||19 June 2007|
Counterion distribution near a monolayer of variable charge density
Institut für Röntgenphysik - Friedrich-Hund Platz 1, 37077 Göttingen, Germany
Accepted: 21 May 2007
We study the bromide counterion distribution near a solid-supported monolayer in the case of vanishing bulk electrolyte concentration by resonant X-ray reflectivity. The surface charge density of the monolayer was varied by using different molar ratios of the cationic Di-Octadecyl-Di-methyl-Ammonium-Bromide (DODAB) and the neutral Di-Palmitoyl-Glycero-Phosphocholine (DPPC). The analysis, either based on a conventional box model with an additional counterion contribution, or based on an independent unbiased global optimization approach, yields a good agreement with the classical Poisson-Boltzmann theory for the salt-free case.
PACS: 87.16.Dg – Membranes, bilayers, and vesicles / 83.85.Hf – X-ray and neutron scattering / 68.08.-p – Liquid-solid interfaces
© Europhysics Letters Association, 2007
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