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000021090 084__ $$2WoS$$aBiochemistry & Molecular Biology
000021090 084__ $$2WoS$$aBiophysics
000021090 1001_ $$0P:(DE-Juel1)VDB97674$$aCherstvy, A.G.$$b0$$uFZJ
000021090 245__ $$aCritical Polyelectrolyte Adsorption under Confinement: Planar Slit, Cylindrical Pore, and Spherical Cavity
000021090 260__ $$aNew York, NY$$bWiley$$c2012
000021090 300__ $$a311 - 317
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000021090 440_0 $$011661$$aBiopolymers$$v97$$x0006-3525$$y5
000021090 500__ $$aContract grant sponsor: Deutsche Forschungsgemeinschaft (DFG)Contract grant number: CH 707/5-1
000021090 520__ $$aWe explore the properties of adsorption of flexible polyelectrolyte chains in confined spaces between the oppositely charged surfaces in three basic geometries. A method of approximate uniformly valid solutions for the Green function equation for the eigenfunctions of polymer density distributions is developed to rationalize the critical adsorption conditions. The same approach was implemented in our recent study for the "inverse" problem of polyelectrolyte adsorption onto a planar surface, and on the outer surface of rod-like and spherical obstacles. For the three adsorption geometries investigated, the theory yields simple scaling relations for the minimal surface charge density that triggers the chain adsorption, as a function of the Debye screening length and surface curvature. The encapsulation of polyelectrolytes is governed by interplay of the electrostatic attraction energy toward the adsorbing surface and entropic repulsion of the chain squeezed into a thin slit or small cavities. Under the conditions of surface-mediated confinement, substantially larger polymer linear charge densities are required to adsorb a polyelectrolyte inside a charged spherical cavity, relative to a cylindrical pore and to a planar slit (at the same interfacial surface charge density). Possible biological implications are discussed briefly in the end.
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000021090 65320 $$2Author$$apolymers
000021090 65320 $$2Author$$aadsorption
000021090 65320 $$2Author$$aelectrostatics
000021090 65320 $$2Author$$aconfinement
000021090 650_2 $$2MeSH$$aAdsorption
000021090 650_2 $$2MeSH$$aComputer Simulation
000021090 650_2 $$2MeSH$$aElectrolytes: chemistry
000021090 650_2 $$2MeSH$$aPolymers: chemistry
000021090 650_2 $$2MeSH$$aSurface Properties
000021090 650_7 $$00$$2NLM Chemicals$$aElectrolytes
000021090 650_7 $$00$$2NLM Chemicals$$aPolymers
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