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Towards neutron scattering experiments with sub-millisecond time resolution
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
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2015 (English)In: Journal of applied crystallography, ISSN 0021-8898, E-ISSN 1600-5767, Vol. 48, p. 220-226Article in journal (Refereed) Published
Abstract [en]

Neutron scattering techniques offer several unique opportunities in materials research. However, most neutron scattering experiments suffer from the limited flux available at current facilities. This limitation becomes even more severe if time-resolved or kinetic experiments are performed. A new method has been developed which overcomes these limitations when a reversible process is studied, without any compromise on resolution or beam intensity. It is demonstrated that, by recording in absolute time the neutron detector events linked to an excitation, information can be resolved on sub-millisecond timescales. Specifically, the concept of the method is demonstrated by neutron reflectivity measurements in time-of-flight mode at the Liquids Reflectometer located at the Spallation Neutron Source, Oak Ridge National Laboratory, Tennessee, USA, combined with in situ rheometry. The opportunities and limitations of this new technique are evaluated by investigations of a micellar polymer solution offering excellent scattering contrast combined with high sensitivity to shear.

Place, publisher, year, edition, pages
2015. Vol. 48, p. 220-226
Keyword [en]
neutron scattering, in situ rheology, block copolymers, time-resolved studies, surface kinetics, large amplitude oscillatory shear (LAOS), time-of-flight reflectometry
National Category
Other Physics Topics
Identifiers
URN: urn:nbn:se:uu:diva-246826DOI: 10.1107/S1600576714027848ISI: 000349210700028OAI: oai:DiVA.org:uu-246826DiVA, id: diva2:794226
Available from: 2015-03-10 Created: 2015-03-10 Last updated: 2018-04-11Bibliographically approved
In thesis
1. Opportunities and challenges of surface scattering at next generation neutron sources
Open this publication in new window or tab >>Opportunities and challenges of surface scattering at next generation neutron sources
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
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.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2018. p. 51
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1666
Keyword
GISANS, data reduction, off-specular, neutron scattering, reflectometry, complex fluids, rheology
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-348348 (URN)978-91-513-0324-6 (ISBN)
Public defence
2018-05-25, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:30 (English)
Opponent
Available from: 2018-05-08 Created: 2018-04-11 Last updated: 2018-05-08

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Adlmann, Franz A.Wolff, Max

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