Developing off-specular neutron reflection to study the instability at the buried soft interface - continuation proposal
A bilayer system of two immiscible polymers of certain thickness is destabilised by the van der Waals forces at the interface via spinodal dewetting. We observed that during the first beamtime and obtained new high quality and novel results but the data are not complete due to technical reasons connected to the optimisation of the samples: in order to get a quantitative understanding of the phenomenon and to publish the results, more data are needed. Further measurements of the thickness dependence need to be performed since only one thickness was fully measured at different annealing times. This can easily be accomplished with an additional beamtime. We plan to measure 4 additional samples of the bilayer system Si/dPS/hPMMA of Mw = 60k for dPS and Mw = 298k for hPMMA with varied thickness of dPS: 110, 130, 150, 180 Å at 5 annealing times in order to observe the change in characteristic spinodal dewetting wavelength as a function of the dPS layer thickness. For these systems we can accurately predict the time it takes for the spinodal dewetting to occur.
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HAFNER Aljosa; GEOGHEGAN Mark; GUTFREUND Philipp; SFERRAZZA Michele and WILDES Andrew. (2018). Developing off-specular neutron reflection to study the instability at the buried soft interface - continuation proposal. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1842
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