Abstract
Grazing incidence small-angle neutron scattering (GISANS) provides access to interfacial properties, e.g., in soft matter on polymers adsorbed at a solid substrate. Simulations in the frame of the distorted wave Born approximation using the BornAgain software allow to understand and quantify the scattering pattern above and below the sample horizon, in reflection and transmission, respectively. The small-angle scattering from the interfacial layer, visible around the transmitted beam, which might contribute also on the side of the reflected beam, can be understood in this way and be included into the analysis. Background reduction by optimized sample cell design is supported by simulations, paving the way for an optimized GISANS cell.
Highlights
In the field of soft matter, interface coatings and interface layers consisting of polymers, polymer microgels, brushes or lipid bilayers are very promising in context of practical application in medicine, smart coatings or switching devices [1,2,3,4]
In the first part of this paper, we present an example where Grazing incidence small-angle neutron scattering (GISANS) experiments together with simulations help to understand the scattering signal and background contributions on the side of reflection and transmission of the GISANS cell
We propose a simple version of sample cell for GISANS experiment aiming decrease the background scattering from the cell parts
Summary
In the field of soft matter, interface coatings and interface layers consisting of polymers, polymer microgels, brushes or lipid bilayers are very promising in context of practical application in medicine, smart coatings or switching devices [1,2,3,4]. Neutron reflectometry allows to study the scattering length density with sub-nanometer resolution in normal direction to the interface [5], while the grazing incidence geometry gives access to the in-plane direction, i.e. to the lateral correlations within the interfacial layers. Grazing incidence small-angle neutron scattering (GISANS) allows a unique access to the interfacial regions, e.g., solid-liquid or liquid-liquid interfaces. Additional information can be obtained by combining grazing incidence neutron scattering and contrast variation via
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