Off-specular neutron scattering from multilayer systems: destabilised and stabilised interfaces
With the increase in beam intensity, the use of off-specular neutron reflection (OS NR) to study interfaces is the next step in the evolution of reflectometry. In the case of ILL, the D17 is an ideal instrument to perform OS NR because of a good area detector. Recently we have started a research program with a focus on model soft matter systems for OS NR. One of such systems is a three layer system of immiscible polymers of a deuterated polymer (dPMMA) sandwiched between thick hydrogenated polymers (hPS) of the same kind. The thin layer in this case dewets via peristalsis process which gives a characteristic grating-like OS intensity. Scientifically, this kind of process is impossible to observe with any other experimental technique. We wish to explore the combined effect of the instabillity of the two interfaces by stacking five three layers on top of each other, creating multilayers for a combined signal from ten dewetting interfaces. We will vary the thickness of dPMMA sandwiched between hPS and measure the OS scattering. Additionaly we will measure reference samples which will not dewet to isolate the pure OS signal: inverse hPMMA/dPS/hPMMA and a miscible hPS/dPS/hPS.
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SFERRAZZA Michele; GEOGHEGAN Mark; GUTFREUND Philipp and HAFNER Aljosa. (2018). Off-specular neutron scattering from multilayer systems: destabilised and stabilised interfaces. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1841
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