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Slow Dynamics at Rigid Interfaces: New Insights with Grazing Incidence Neutron Spin Echo Spectroscopy; NOP & D-Konferenz für “IOP Conference Series”
Citation key hold14
Author Holderer, O. and Frielinghaus, H. and Wellert, S. and Lipfert, F. and Monkenbusch, M. and von Klitzing, R. and Richter, D.
Year 2014
DOI 10.1088/1742-6596/528/1/012025
Journal Journal of Physics: Conference Series
Volume 528
Number 012025
Abstract Grazing Incidence Neutron Spin Echo Spectroscopy (GINSES) opens new possibilities for observing the thermally driven dynamics of macromolecules close to a rigid interface. The information about the dynamics can be retrieved as a function of scattering depth of the evanescent neutron wave, on the length scale in the range of some 10-100 nm. Using a classical neutron spin echo spectrometer with a laterally collimated beam, dynamics can be measured in grazing incidence geometry. We show examples of how the interface modifies the dynamics of microemulsions, membranes and microgels. Instrumental details and possible improvements for this technique will be presented. The key issue is the low intensity for dynamics measurements with an evanescent neutron wave. Conceptual questions how a specialised instrument could improve the experimental technique will be discussed.
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