Journal Article

PreJuSER-21090

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Critical Polyelectrolyte Adsorption under Confinement: Planar Slit, Cylindrical Pore, and Spherical Cavity

Cherstvy, A. G.FZJ*

2012
Wiley New York, NY

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Please use a persistent id in citations: doi:10.1002/bip.22023

Abstract: We 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.

Keyword(s): Adsorption (MeSH) ; Computer Simulation (MeSH) ; Electrolytes: chemistry (MeSH) ; Polymers: chemistry (MeSH) ; Surface Properties (MeSH) ; Electrolytes ; Polymers ; J ; polymers (auto) ; adsorption (auto) ; electrostatics (auto) ; confinement (auto)

Note: Contract grant sponsor: Deutsche Forschungsgemeinschaft (DFG)Contract grant number: CH 707/5-1

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Contributing Institute(s):

1. Theorie der weichen Materie und Biophysik (ICS-2)

Research Program(s):

1. BioSoft: Makromolekulare Systeme und biologische Informationsverarbeitung (P45)

Appears in the scientific report 2012

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Database coverage:
; BIOSIS Previews ; Current Contents - Life Sciences ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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