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ACS Macro Lett. 2011 Nov 30;2012(1):127-130.

Anisotropic Diffusion of Polyelectrolyte Chains within Multilayer Films.

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  • 1Department of Chemistry, Chemical Biology and Biomedical Engineering, Stevens Institute of Technology, Hoboken, New Jersey 07030.

Abstract

We have found diffusion of polyelectrolyte chains within multilayer films to be highly anisotropic, with the preferential chain motion parallel to the substrate. The degree of anisotropy was quantified by a combination of fluorescence recovery after photobleaching and neutron reflectometry, probing chain diffusion in directions parallel and perpendicular to the substrate, respectively. Chain mobility was controlled by ionic strength of annealing solutions and steric hindrance to ionic pairing of interacting polyelectrolytes.

PMID:
23019538
[PubMed]
PMCID:
PMC3454581
Free PMC Article
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