• Dynamical Theory:
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A tool for probing the structure of matter in Nano-confinement
• Introduction
The self-assembly of matter in Nano-confinement is a potential cost-effective method for fabricating highly ordered Nano-materials. To better control the assembly it is necessary to understand the behavior of confined matter and so a 3D structural characterization is crucial. Non-destructive probing of such samples challenges conventional microscopy techniques. On the other hand, the submicron size of a single confinement is impractical for neutron and x-ray scattering experiments but this dilemma can be overcome by using a confining matrix made up of an array of identical confinements such as the grooves of a diffraction grating. The caveat is that the periodicity of the sample amplifies dynamical scattering effects that are not accounted for in approximate scattering theories and a complete dynamical theory (DT) calculation becomes unavoidable. On the other hand, the Spin-Echo Scattering Angle Measurement (SESAME) technique allows access to length scales of interest (few-tens-of-nanometers to several-microns) and is ideal for such systems. The combination of DT and SESAME has been successfully tested on periodic nanostructures and is being implemented in the study of matter in confinement and of soft membranes on corrugated substrates. Recent DT/SESAME results on a colloidal silica suspension in contact with a diffraction grating with submicron channels show colloidal jamming in the channels.
• Dynamical Theory
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• Conlcusions
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