Surfaces with quenched and annealed disordered charge distributions |
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Authors: | C C Fleck R R Netz |
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Institution: | (1) Physics Institute, University of Freiburg, 79104 Freiburg, Germany;(2) Physics Department, Technical University Munich, 85748 Garching, Germany |
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Abstract: | We consider surfaces with disordered charge distribution. The disorder can be caused by mobile charges, as for example in
mixed lipid bilayers, or by weakly charged surfaces where charge regulation takes place (e.g. carboxyl groups). Using Monte-Carlo
simulation methods we find for quenched as well as annealed disordered charge distributions counterion densities close to
the surface that are significantly larger than for ordered regularly spaced surface ions. Our field-theoretic results agree
well with results obtained from Monte-Carlo simulations of the system. Furthermore, we obtain expressions for the effective
interaction between charged colloids and charged rods close to a charged surface and discuss the effect of the surface-ion
mobility and polarization charges on the interaction. In general, polarization effects as well as surface-ion mobility lead
to a weakening of the effective interaction between charged objects. |
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Keywords: | 61 20 Qg Structure of associated liquids: electrolytes molten salts etc 61 20 Ja Computer simulation of liquid structure 87 16 Dg Membranes bilayers and vesicles 87 15 Kg Molecular interactions membrane-protein interaction |
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