Examining the mechanism of multilayer formation at interfaces of polyelectrolyte/surfactant mixtures
The formation of functionalized interfaces using multilayer assemblies, such as those self-assembled at surfaces of soft matter systems, attracts considerable interest. We have recently demonstrated that interfacial multilayers in a polyelectrolyte/surfactant system can result from the transport under gravity of bulk aggregates with internal molecular order. A strong Bragg peak and off-specular scattering were observed in neutron reflectivity measurements of Pdadmac/SDS mixtures only in the phase separation region and only when creaming or sedimentation occurred in the direction of the interface. The work was carried out on FIGARO using a combination of air/liquid and solid/liquid measurements, the latter exploiting a comparison of reflection up/down configurations. As spontaneous surface self-assembly and the transport of bulk aggregates would give rise to different surface properties we need to determine if the newly-demonstrated mechanism is widespread. We propose an assessment of PEI/SDS at two different pHs and PSS/CxTABs at two different chain lengths. Our results have the potential to impact on a range of studies in soft matter and biology on FIGARO and other reflectometers.
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Richard A. Campbell; NOSKOV Boris; NYLANDER Tommy; VARGA Imre and Marianna Yanez Arteta. (2012). Examining the mechanism of multilayer formation at interfaces of polyelectrolyte/surfactant mixtures. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1186
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