Depth-resolved grazing-incidence time-of-flight neutron scattering from a solid–liquid interface

Wolff, Max; Herbel, Jörg; Adlmann, Franz A.; Dennison, Andrew J. C.; Liesche, G.; Gutfreund, Philipp; Rogers, Sarah E.

doi:10.1107/s1600576713028665

Cited by 15 publications

(16 citation statements)

References 22 publications

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“…Temperatures close to ambient also avoid excessive evaporation or condensation of the water, which would change the polymer concentration during the measurements. It has been reported that the properties of the interfacial layer of the polymer solution depend strongly on the surface treatment of the substrate (Wolff et al, 2005(Wolff et al, , 2014. Additionally, pre-crystallization at the liquid-solid interface has been observed (Gerstenberg et al, 1998).…”

Section: Samplementioning

confidence: 99%

“…The sample was stirred by a magnetic stirrer at this low temperature until a homogeneous transparent solution formed (Song et al, 2000). It is important to note that this sample is known to have a large scattering contrast for neutron scattering studies if solved in heavy water (Mortensen, 1996;Jiang et al, 2007;Wolff et al, 2013), together with interesting surface and shear properties (Hyun et al, 2006;Wolff et al, 2014).…”

Section: Samplementioning

confidence: 99%

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Towards neutron scattering experiments with sub-millisecond time resolution

et al. 2015

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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.

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Section: Samplementioning

confidence: 99%

Section: Samplementioning

confidence: 99%

Towards neutron scattering experiments with sub-millisecond time resolution

et al. 2015

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“…Figure 6. Left panel: GISANS scattering pattern plotted on the surface of the Ewald sphere in three dimensions [18]. Right panel: Reciprocal lattice for a cubic close packing (ccp).…”

Section: Off-specular and Gisansmentioning

confidence: 99%

“…0.175 mm for a 5 cm sample under the angle of 0.2 • is small. Figure 11 depicts patterns of intensity measured on SANS-2D (Rutherford Institute, Didcot, England) for the polymer solution discussed above but now in contact to two silicon wafers with distinct surface energies [18]. The incident beam was collimated to provide a divergence of 0.29 • and 0.04 • along y and z direction, respectively.…”

Section: Modes Of Measurementmentioning

confidence: 99%

Grazing incidence scattering

Wolff

2018

EPJ Web of Conferences

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Reflectometry experiments probe the scattering length density along the normal of interfaces by analysing the specularly scattered intensity. Lateral fluctuations result in intensity scattered away from the specular condition. In this paper the principles and peculiarities of grazing incidence scattering experiments are explained. One specific example, the self assembly of polymer micelles close to interfaces, is taken as a show case in order to introduce the scattering geometry and accessible length scales. The basic idea of the distorted wave Born approximation is lined out and some scientific examples are summarized.

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“…In the majority of the studies (Mü ller-Buschbaum et al, 2008;Als-Nielsen et al, 1994;Prieve & Walz, 1993;Dosch et al, 1986;Wolff et al, 2014;Al-Hussein et al, 2013;Parratt, 1954;Dietrich & Wagner, 1984;Gutfreund, 2011), the penetration depth can be expressed as…”

Section: Theorymentioning

confidence: 99%

Grazing-incidence small-angle neutron scattering from structures below an interface

et al. 2017

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Changes of scattering are observed as the grazing angle of incidence of an incoming beam increases and probes different depths in samples. A model has been developed to describe the observed intensity in grazing-incidence smallangle neutron scattering (GISANS) experiments. This includes the significant effects of instrument resolution, the sample transmission, which depends on both absorption and scattering, and the sample structure. The calculations are tested with self-organized structures of two colloidal samples with different size particles that were measured on two different instruments. The model allows calculations for various instruments with defined resolution and can be used to design future improved experiments. The possibilities and limits of GISANS for different studies are discussed using the model calculations.

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Depth-resolved grazing-incidence time-of-flight neutron scattering from a solid–liquid interface

Cited by 15 publications

References 22 publications

Towards neutron scattering experiments with sub-millisecond time resolution

Towards neutron scattering experiments with sub-millisecond time resolution

Grazing incidence scattering

Grazing-incidence small-angle neutron scattering from structures below an interface

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