Resonance-enhanced off-specular scattering from unstable polymer/polymer interfaces
Lately we have been developing off-specular neutron scattering for the study of soft buried interfaces on two model systems: an immiscible polymer bilayer with a single interface, destabilised by van der Waals forces and a three layer system where a polystyrene layer is sandwiched between two thick poly-methyl methacrylate layers. In order to improve the signal coming from these systems, we propose an optimised system of a "soft neutron guide" with the system of interest on top. A potential well will be created (Fabry-Perot configuration) by putting a polymer of low scattering length density between two deuterated polymers of high scattering density. By varying the thicknesses of the barriers and the well we will optimise the probability density for a neutron to tunnel through the barrier and then propagate in the low density material. System will then be annealed above glass transition temperature in order to observe dewetting of the lowest layer. Because of the resonance effect in the potential well, the off-specular signal should improve considerably.
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SFERRAZZA Michele; GEOGHEGAN Mark; GUTFREUND Philipp and HAFNER Aljosa. (2018). Resonance-enhanced off-specular scattering from unstable polymer/polymer interfaces. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1873
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