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MM: Metall- und Materialphysik
MM 25: Poster Session
MM 25.31: Poster
Mittwoch, 29. März 2006, 15:30–17:30, P4
Very Cold Neutrons Reflection from surface of various materials — •Andrey Udovenko1, Sergey Kuznetsov1, Yurii Lapushkin1, Anatolii Shelagin2, Vitalii Grinev3, Nataliya Kovaleva3, and Liudmila Novokshonova3 — 1Lebedev Physics Institute, Moscow, Russian Federation — 2Moscow Physics Technical Institute, Moscow, Russian Federation — 3Semenov Chemical Physics Institute, Moscow, Russian Federation
Very cold neutron scattering and reflection were used to study the nano structure and the surface roughness of various materials. The dependence of the reflectivity coefficient vs. neutron wavelength for thermo pressed beryllium was obtained. The dimensions and concentrations of pores inside the sample, and the surface roughness were determined simultaneously. The average size and concentration of pores are in good agreement with the date obtained earlier by VCN transition method. The structural properties of Deuterated Polyethylene (DPE) covering grown on Si single-crystal surface activated previously by catalyst were studied by this technique. In particular, it was shown that the structure of the DPE layer near the Si substrate is more ordered than usual semi crystalline structure on the top of the DPE layer. This information can be of use for the development of the polymer composites with high polymer density around the filler particles. The results obtained are consistent with the observations made by optical and electron microscopy that suggests about the applicability of VCN reflectometry to the structural studies of the wide class of materials.