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Överlåtaren: a fast way to transfer and orthogonalize two-dimensional off-specular reflectivity data
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialfysik.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialfysik.
Oak Ridge Natl Lab, Spallat Neutron Source, Oak Ridge, TN USA..
Oak Ridge Natl Lab, Spallat Neutron Source, Oak Ridge, TN USA..
Vise andre og tillknytning
2016 (engelsk)Inngår i: Journal of applied crystallography, ISSN 0021-8898, E-ISSN 1600-5767, Vol. 49, s. 2091-2099Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Reflectivity measurements offer unique opportunities for the study of surfaces and interfaces, and specular reflectometry has become a standard tool in materials science to resolve structures normal to the surface of a thin film. Off-specular scattering, which probes lateral structures, is more difficult to analyse, because the Fourier space being probed is highly anisotropic and the scattering pattern is truncated by the interface. As a result, scattering patterns collected with (especially time-of-flight) neutron reflectometers are difficult to transform into reciprocal space for comparison with model calculations. A program package is presented for a generic two-dimensional transformation of reflectometry data into q space and back. The data are represented on an orthogonal grid, allowing cuts along directions relevant for theoretical modelling. This treatment includes background subtraction as well as a full characterization of the resolution function. The method is optimized for computational performance using repeatable operations and standardized instrument settings.

sted, utgiver, år, opplag, sider
2016. Vol. 49, s. 2091-2099
Emneord [en]
off-specular scattering, neutron reflectometry, interfaces, surfaces
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-315086DOI: 10.1107/S1600576716014382ISI: 000391195900025OAI: oai:DiVA.org:uu-315086DiVA, id: diva2:1073217
Forskningsfinansiär
Swedish Research Council, C0511501The Swedish Foundation for International Cooperation in Research and Higher Education (STINT), IG-2011-2067Tilgjengelig fra: 2017-02-09 Laget: 2017-02-09 Sist oppdatert: 2018-04-11bibliografisk kontrollert
Inngår i avhandling
1. Opportunities and challenges of surface scattering at next generation neutron sources
Åpne denne publikasjonen i ny fane eller vindu >>Opportunities and challenges of surface scattering at next generation neutron sources
2018 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Complex fluids and soft matter are ubiquitously found in the world and all contacts in life are made over surfaces. To describe the mechanical behavior of such substances, rheological methods are used. Flow instabilities are a big challenge in rheology since they will be reflected in the macroscopic variables probed, like e. g. the viscosity. Many such discontinuities may actually originate at the surface. Investigating the properties of liquids in contact with the surface under mechanical load is the main course of the thesis. Neutron reflectometry and GISANS are perfect tools in this context to access the solid liquid interfaces, since they can penetrate many engineering materials and show a comparably large scattering potential at deuterated samples. In this thesis shear was applied on a model solution and neutron scattering techniques were used to investigate the structure under load. The focus was set on the development of the measurement methods themselves to enable new scientific insights in the future. First, by stroboscopic measurements the flux limitations are overcome for oscillatory rheology. By reintegration in the post processing it is shown that kinetic measurements with neutrons are possible with a time resolution below one millisecond. Second, the transformation of grazing incidence data from the laboratory system into q-space is strongly non-linear resulting in a need for re-binning. In this thesis a universal tool has been developed for this purpose. Finally, there is an ongoing discussion on depth sensitive neutron scattering experiments from solid-liquid boundaries. By using emission densities we show that such experiments face severe limitations due to the low absorption cross section of the neutron.

sted, utgiver, år, opplag, sider
Uppsala: Acta Universitatis Upsaliensis, 2018. s. 51
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1666
Emneord
GISANS, data reduction, off-specular, neutron scattering, reflectometry, complex fluids, rheology
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-348348 (URN)978-91-513-0324-6 (ISBN)
Disputas
2018-05-25, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:30 (engelsk)
Opponent
Tilgjengelig fra: 2018-05-08 Laget: 2018-04-11 Sist oppdatert: 2018-10-08

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