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Surfactant-mediated desorption of polymer from the nanoparticle interface.

Authors
Type
Published Article
Journal
Langmuir
1520-5827
Publisher
American Chemical Society
Publication Date
Volume
28
Issue
5
Pages
2485–2492
Identifiers
DOI: 10.1021/la204512d
PMID: 22188133
Source
Medline

Abstract

The surfactant-mediated desorption of adsorbed poly(vinylpyrrolidone), PVP, from anionic silica surfaces by sodium dodecyl sulfate, SDS, was observed. While photon correlation spectroscopy shows that the size of the polymer-surfactant-particle ensemble grows with added SDS, a reduction in the near-surface polymer concentration is measured by solvent relaxation NMR. Volume fraction profiles of the polymer layer extracted from small-angle neutron scattering experiments illustrate that the adsorbed polymer layer has become more diffuse and the polymer chains more elongated as a result of the addition of SDS. The total adsorbed amount is shown to decrease due to Coulombic repulsion between the surfactant-polymer complexes and between the complexes and the anionic silica surface.

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