- Non-uniform hydration and odd-even effects in confined polyelectrolyte multilayers (keynote talk). WM de Vos, LLE Mears, R Barker, T Cosgrove, RM Richardson and SW Prescott. International Association of Colloids and Interface Scientists Conference, Sendai, Japan, May 2012.
Polyelectrolyte multilayer (PEM) structures consisting of bilayers of poly(styrene sulfonate) (PSS) and poly(allyl amine) (PAH) on a silicon substrate were compressed in our recently developed confinement cell. The structure of the PEM stack was measured by neutron reflection while a confining pressure was varied from 0 to 5 bar. The volume fraction of water in the multilayer decreased with applied pressure and PSS-terminated PEMs remained more swollen than PAH-terminated PEMs. Surprisingly, the compression-induced deswelling of the PAH-terminated PEMs is uneven (with the layers closer to the silicon substrate being preferentially dehydrated) while in the PSS-terminated PEM, the water is more evenly distributed.
Last edited: Friday September 10, 2010
Copyright © 1996-2014 Stuart Prescott