DCD USANS and SESANS: a comparison of two neutron scattering techniques applicable for the study of large-scale structures

Rehm, Christine; Barker, J. G.; Bouwman, Wim G.; Pynn, R.

doi:10.1107/s0021889812050029

Cited by 23 publications

(14 citation statements)

References 26 publications

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“…Additionally, some sedimentation cannot be excluded for this sample as well. However, the uncertainties in the current results compare favourably with reported corresponding values presented in a study comparing the accuracy of ultra-small-angle neutron scattering measured with doublecrystal diffractometers and SESANS (Rehm et al, 2013). Fig.…”

Section: Resultssupporting

confidence: 87%

Wavelength-dispersive dark-field contrast: micrometre structure resolution in neutron imaging with gratings

et al. 2016

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Dark-field imaging using grating interferometers has been proven to have a high potential for applications in engineering, magnetism, and soft matter and biophysics, as well as in medicine with both neutrons and X-rays. The access to spatially resolved small-angle scattering information in neutron dark-field imaging provides information about structures beyond direct spatial image resolution. The dark-field contrast modality is hence a valuable tool for materials science based on neutron imaging. This is underlined by the success of the method, despite its current limitation to qualitative scattering information.Here it is demonstrated how a wavelength-dispersive approach allows such drawbacks to be overcome by providing quantitative structure size information and hence can introduce novel possibilities and insights for materials science.

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Section: Resultssupporting

confidence: 87%

Wavelength-dispersive dark-field contrast: micrometre structure resolution in neutron imaging with gratings

et al. 2016

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“…The SESANS technique is capable of examining much larger length scales (up to 10's of microns) than traditional SANS and is comparable in the upper range to the accessible length scales probed by ultra small angle neutron scattering (USANS). 19 The approach has a major advantage over the latter technique in that it can be applied to high concentration samples, as multiple neutron scattering effects may be taken into account exactly, 20 whereas USANS is a dilute solution measurement. The technique does not change the geometry of the sample, the scan ranges are determined by the applied magnetic fields and since the scattering is encoded in the beam polarisation rather than determined from angular deviations SESANS can also employ rather divergent beams, allowing efficient use of the available polarised neutron flux.…”

Section: Introductionmentioning

confidence: 99%

Porosity of silica Stöber particles determined by spin-echo small angle neutron scattering

et al. 2016

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Stöber silica particles are used in a diverse range of applications. Despite their widespread industrial and scientific uses, information on the internal structure of the particles is non-trivial to obtain and is not often reported. In this work we have used spin-echo small angle neutron scattering (SESANS) in conjunction with ultra small angle X-ray scattering (USAXS) and pycnometry to study an aqueous dispersion of Stöber particles. Our results are in agreement with models which propose that Stöber particles have a porous core, with a significant fraction of the pores inaccessible to solvent. For samples prepared from the same master sample in a range of H2O : D2O ratio solutions we were able to model the SESANS results for the solution series assuming monodisperse, smooth surfaced spheres of radius 83 nm with an internal open pore volume fraction of 32% and a closed pore fraction of 10%. Our results are consistent with USAXS measurements. The protocol developed and discussed here shows that the SESANS technique is a powerful way to investigate particles much larger than those studied using conventional small angle scattering methods.

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“…Another measure that can be used as a guide to evaluate the probability of multiple scattering, is the so-called T SAS value. This corresponds to the fraction of the beam that passes through the sample without being scattered [38,39]. The T SAS value of a sample is experimentally determined as the ratio between the transmission of the direct beam (T Rock , as measured on the main detector) and the overall transmission of the direct beam and scattering pattern (T Wide , as measured on the transmission detector) and it can also be theoretically estimated.…”

Section: Resultsmentioning

confidence: 99%

“…A T SAS value well above 0.9 indicates that the scattering signal is rather weak for USANS with a reduced probability of multiple scattering, while a decrease in a T SAS value below 0.9 indicates that there is an increased probability of multiple scattering. The T SAS value can be a very useful tool as a guide to the expected degree of multiple scattering [38][39][40]. Note however, that the effect of multiple scattering on scattering curves is q-dependent (see discussion below), and a higher degree of multiple scattering can be tolerated if the scattering curves do not show sharp features even in the single scattering regime.…”

Section: Resultsmentioning

confidence: 99%

H2O/D2O Contrast Variation for Ultra-Small-Angle Neutron Scattering to Minimize Multiple Scattering Effects of Colloidal Particle Suspensions

Otsuki

Campo

Garvey

et al. 2018

Colloids and Interfaces

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This study investigated the use of solvent contrast (H 2 O/D 2 O ratio) as a means to optimize the ultra-small-angle neutron scattering (USANS) signal. By optimizing the signal, it was possible to reduce the undesirable effects of coherent multiple scattering while still maintaining a measurable scattered intensity. This result will further enable the use of USANS as a probe of the interactions between colloidal particles and their structures within concentrated suspensions as well as particle dispersion/aggregation. As a model system, we prepared silica colloidal particle suspensions at different solid concentrations. USANS curves were measured using the classical Bonse-Hart double crystal diffractometer while varying the scattering length density of the aqueous phase, thus varying the contrast to the silica particles. As a means of assessing the impact of multiple scattering effects on different q-values, we analyzed the scattered intensity at different contrasts at three different q values. The data were then used to determine the match point of the silica particle suspensions from the expected square root dependence of the scattered intensity with solvent composition, to analyze any differences associated with the solid concentration change, and to determine the optimum H 2 O/D 2 O ratio in terms of high transmission (T SAS > 80%) and high enough scattering intensity associated with the contrast of the system. Through this investigation series, we confirmed that adjusting the contrast of the solvent (H 2 O/D 2 O) is a good methodology to reduce multiple scattering while maintaining a strong enough scattering signal from a concentrated suspension of silica particles for both USANS and rheometric USANS (rheo-USANS) experiments.

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DCD USANS and SESANS: a comparison of two neutron scattering techniques applicable for the study of large-scale structures

Cited by 23 publications

References 26 publications

Wavelength-dispersive dark-field contrast: micrometre structure resolution in neutron imaging with gratings

Wavelength-dispersive dark-field contrast: micrometre structure resolution in neutron imaging with gratings

Porosity of silica Stöber particles determined by spin-echo small angle neutron scattering

H2O/D2O Contrast Variation for Ultra-Small-Angle Neutron Scattering to Minimize Multiple Scattering Effects of Colloidal Particle Suspensions

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