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Issue 28, 2011
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Molecular mass dependence of adsorbed amount and hydrodynamic thickness of polyelectrolyte layers

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Abstract

Highly charged polyelectrolytes adsorbed on oppositely charged colloidal particles are investigated by electrophoresis and dynamic light scattering. The dependence of the adsorbed amount and of the hydrodynamic layer thickness on the molecular mass and the salt level is analyzed. The adsorbed amount increases with increasing salt level and decreases with increasing molecular mass. The hydrodynamic layer thickness is independent of the molecular mass at low salt levels, but increases with the molecular mass as a power law with an exponent 0.10 ± 0.01 at high salt. The same behavior was observed for different polyelectrolytes and substrates and therefore is suspected to be generic. Due to semi-quantitative agreement with computer simulations carried out by Kong and Muthukumar in 1998, the observed behavior is interpreted with conformational changes of single adsorbed polyelectrolyte chains.

Graphical abstract: Molecular mass dependence of adsorbed amount and hydrodynamic thickness of polyelectrolyte layers

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Publication details

The article was received on 07 Mar 2011, accepted on 07 Jun 2011 and first published on 20 Jun 2011


Article type: Communication
DOI: 10.1039/C1CP20654K
Citation: Phys. Chem. Chem. Phys., 2011,13, 12716-12719
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    Molecular mass dependence of adsorbed amount and hydrodynamic thickness of polyelectrolyte layers

    E. Seyrek, J. Hierrezuelo, A. Sadeghpour, I. Szilagyi and M. Borkovec, Phys. Chem. Chem. Phys., 2011, 13, 12716
    DOI: 10.1039/C1CP20654K

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