Soft particles in an electric field – a zero average contrast study

Small-angle neutron scattering experiments on microgels provide information about the response of the individual particles to an external electric field.

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A temperature-controlled electric field sample environment for small-angle neutron scattering experiments

Review of Scientific Instruments ◽

10.1063/5.0040675 ◽

2021 ◽

Vol 92 (3) ◽

pp. 033903

Author(s):

Dominic W. Hayward ◽

Germinal Magro ◽

Anja Hörmann ◽

Sylvain Prévost ◽

Ralf Schweins ◽

...

Keyword(s):

Electric Field ◽

Neutron Scattering ◽

Small Angle ◽

Small Angle Neutron Scattering ◽

Field Sample ◽

Temperature Controlled ◽

Sample Environment

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Insight into neutron focusing: the out-of-focus condition

Journal of Applied Crystallography ◽

10.1107/s0021889813018633 ◽

2013 ◽

Vol 46 (5) ◽

pp. 1361-1371 ◽

Cited By ~ 1

Author(s):

B. Hammouda ◽

D. F. R. Mildner ◽

A. Brûlet ◽

S. Desert

Keyword(s):

Standard Deviation ◽

Neutron Scattering ◽

Small Angle ◽

Small Angle Neutron Scattering ◽

Neutron Wavelength ◽

Focus Condition ◽

The Mean ◽

The Individual ◽

Multiple Holes ◽

Good Agreement

Neutron focusing leads to significant gains in flux-on-sample in small-angle neutron scattering and very small angle neutron scattering instruments. Understanding the out-of-focus condition is necessary for less than optimal conditions such as for short instruments and low neutron wavelengths. Neutron focusing is investigated using a three-pronged approach. The three methods are analytical calculations, resolution measurements and computer simulations. A source aperture containing a single small-size hole and a sample aperture containing multiple holes are used to produce multiple spots on the high-resolution neutron detector. Lens focusing elongates off-axis spots in the radial direction. The standard deviation for the size of each spot is estimated using these three approaches. Varying parameters include the neutron wavelength, the number of focusing lenses and the location of holes on the sample aperture. Enough agreement for the standard deviation of the individual neutron beams was found between the calculations and the measurements to give confidence in this approach. Good agreement was found between the standard deviations obtained from calculations and simulations as well. Excellent agreement was found for the mean location of these individual spots.

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Determination of closed porosity in rocks by small-angle neutron scattering

Journal of Applied Crystallography ◽

10.1107/s1600576716014904 ◽

2016 ◽

Vol 49 (6) ◽

pp. 2021-2030 ◽

Cited By ~ 13

Author(s):

Jitendra Bahadur ◽

Cristian R. Medina ◽

Lilin He ◽

Yuri B. Melnichenko ◽

John A. Rupp ◽

...

Keyword(s):

Neutron Scattering ◽

Small Angle ◽

Pore Volume ◽

Small Angle Neutron Scattering ◽

Volume Fraction ◽

Significant Proportion ◽

Potential Candidate ◽

Deep Saline Aquifer ◽

Average Contrast ◽

Inaccessible Pore Volume

Small-angle neutron scattering (SANS) and ultra-small-angle neutron scattering (USANS) have been used to study a carbonate rock from a deep saline aquifer that is a potential candidate as a storage reservoir for CO2sequestration. A new methodology is developed for estimating the fraction of accessible and inaccessible pore volume using SANS/USANS measurements. This method does not require the achievement of zero average contrast for the calculation of accessible and inaccessible pore volume fraction. The scattering intensity at highQincreases with increasing CO2pressure, in contrast with the low-Qbehaviour where the intensity decreases with increasing pressure. Data treatment for high-Qscattering at different pressures of CO2is also introduced to explain this anomalous behaviour. The analysis shows that a significant proportion of the pore system consists of micropores (<20 Å) and that the majority (80%) of these micropores remain inaccessible to CO2at reservoir pressures.

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SANS

10.1093/oso/9780199670871.003.0011 ◽

2018 ◽

Author(s):

Eaton E. Lattman ◽

Thomas D. Grant ◽

Edward H. Snell

Keyword(s):

Neutron Scattering ◽

Small Angle ◽

Biological Samples ◽

Small Angle Neutron Scattering ◽

Structural Studies ◽

Unique Information ◽

The Individual ◽

Contrast Matching

Small angle neutron scattering (SANS) is a specialized application of solution scattering limited by source availability and intensity. While not routinely used for structural studies of biological samples in general, it does have unique characteristics that make it attractive to determining the individual positions of components of complexes. This is due to the scattering properties of hydrogen and deuterium allowing the technique of contrast matching. SANS is highly complementary to SAXS and provides unique information not available by other techniques. This chapter discussed SANS, instrumentation, and application.

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Influence of Hydrogen on the Structure of Amorphous Sputtered Fe-Co-Tb Films by Means of Wide- and Small Angle Neutron Scattering

Zeitschrift für Naturforschung A ◽

10.1515/zna-1991-1203 ◽

1991 ◽

Vol 46 (12) ◽

pp. 1015-1020 ◽

Cited By ~ 1

Author(s):

M. Heckele ◽

R. Bellissent ◽

A. Brunseh ◽

P. Lamparter ◽

S. Steeb

Keyword(s):

Neutron Scattering ◽

Small Angle ◽

Small Angle Neutron Scattering ◽

Short Range ◽

Short Range Order ◽

Pair Correlation ◽

Range Order ◽

Hydrogen Incorporation ◽

Plane Anisotropy ◽

The Individual

Abstract Sputtered amorphous Fe-Co Tb-films with perpendicular and in-plane magnetic anisotropy were investigated by wide- and small angle neutron scattering. By combination with X-ray data the maxima in the pair correlation function could be attributed to the individual atomic pairs. Thus also partial coordination numbers and a short range order parameter could be determined. Wide angle diffraction revealed that the film with magnetic in-plane anisotropy contained 13 atomic percent hydrogen. The hydrogen incorporation causes substantial changes in the short range order, associated with enhanced formation of Tb-rich clusters, and the in-plane anisotropy. The clustering effect was confirmed by results from small angle scattering with polarized neutrons

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Interpenetrated biosurfactant-silk fibroin networks – a SANS study

Soft Matter ◽

10.1039/d0sm01869d ◽

2021 ◽

Author(s):

Andrea Lassenberger ◽

Anne Martel ◽

Lionel Porcar ◽

Niki Baccile

Keyword(s):

Neutron Scattering ◽

Silk Fibroin ◽

Small Angle ◽

Small Angle Neutron Scattering ◽

Scattering Study ◽

Neutron Scattering Study ◽

The Individual

A small angle neutron scattering study reveals the structure of silk-fibroin sophorolipid composites to be interpenetrated, fibrous networks with the individual components retaining their initial structures.

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The small-angle neutron scattering instrument D33 at the Institut Laue–Langevin

Journal of Applied Crystallography ◽

10.1107/s1600576715021792 ◽

2016 ◽

Vol 49 (1) ◽

pp. 1-14 ◽

Cited By ~ 44

Author(s):

C. D. Dewhurst ◽

I. Grillo ◽

D. Honecker ◽

M. Bonnaud ◽

M. Jacques ◽

...

Keyword(s):

Neutron Scattering ◽

Small Angle ◽

Small Angle Neutron Scattering ◽

Soft Matter ◽

Materials Science ◽

Dynamic Range ◽

General Purpose ◽

Flexible System ◽

The Individual ◽

Sans Instrument

The D33 small-angle neutron scattering (SANS) instrument at the Institut Laue–Langevin (ILL) is the most recent SANS instrument to be built at the ILL. In a project beginning in 2005 and lasting seven years, the concept has been developed, and the instrument designed, manufactured and installed. D33 was commissioned with neutrons during the second half of 2012, fully entering the ILL user programme in 2013. The scientific case required that D33 should provide a wide dynamic range of measured scattering vector magnitudeq, flexibility with regard to the instrument resolution, and the provision of polarized neutrons and3He spin analysis to facilitate and expand studies in magnetism. In monochromatic mode, a velocity selector and a flexible system of inter-collimation apertures define the neutron beam. A double-chopper system enables a time-of-flight (TOF) mode of operation, allowing an enhanced dynamicqrange (qmax/qmin) and a flexible wavelength resolution. Two large multitube detectors extend the dynamicqrange further, givingqmax/qmin≃ 25 in monochromatic mode and a very largeqmax/qmin> 1000 in TOF mode. The sample zone is large and flexible in configuration, accommodating complex and bulky sample environments, while the position of D33 is such as to allow high magnetic fields at the sample position. The instrument is of general purpose with a performance rivalling that of D22, and is well adapted for SANS studies in scientific disciplines as diverse as solution scattering in biology and soft matter and studies of physics, materials science and magnetism. This article provides a detailed technical description of D33 and its performance and characterization of the individual components, and serves as a technical reference for users of the instrument.

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Small-Angle Neutron Scattering Study of Transformer Oil-Based Ferrofluids

Ukrainian Journal of Physics ◽

10.15407/ujpe65.8.729 ◽

2020 ◽

Vol 65 (8) ◽

pp. 729

Author(s):

M. Karpets ◽

M. Rajnak ◽

O. Ivankov ◽

K. Paulovicova ◽

M. Timko ◽

...

Keyword(s):

Electric Field ◽

Neutron Scattering ◽

Small Angle ◽

Small Angle Neutron Scattering ◽

Colloidal Particles ◽

Transformer Oil ◽

Particle Assembly ◽

Nanoparticle Aggregates ◽

Dc Electric Field ◽

Neutron Scattering Study

It is known that ferrofluids typically respond to magnetic fields and can be manipulated by such external fields. The particle assembly in magnetic nanofluids can be induced even by a direct current (dc) electric field. An experimental study of magnetic colloidal particles and their changes induced by an external electric field in a ferrofluid based on 2 transformer oils with different concentrations of nanoparticles is presented. By small-angle neutron scattering (SANS), we show the influence of the electric field intensity and the concentration on magnetic nanoparticle aggregates.

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Dependence of small-angle neutron scattering contrast on the difference in thermal expansions of phases in two-phase alloys

Journal of Applied Crystallography ◽

10.1107/s0021889809035353 ◽

2009 ◽

Vol 42 (6) ◽

pp. 981-989 ◽

Cited By ~ 1

Author(s):

Pavel Strunz ◽

Ralph Gilles ◽

Debashis Mukherji ◽

Michael Hofmann ◽

Dominique del Genovese ◽

...

Keyword(s):

Neutron Scattering ◽

Small Angle ◽

Small Angle Neutron Scattering ◽

Elevated Temperatures ◽

Base Alloy ◽

Integral Intensity ◽

Two Phase ◽

The Difference ◽

The Individual

Theoretical expressions describing small-angle neutron scattering (SANS) contrast dependence on temperature in the region where no phase-composition changes occur were derived for two-phase Ni superalloys. The theory is based on the difference in thermal expansion of the two primary phases, γ and γ′. The simulations show that the scattering contrast temperature evolution is significant enough to be considered inin situSANS experiments with superalloys at elevated temperatures. The simulations performed show that the magnitude of the scattering contrast at room temperature is firmly connected with the particular shape of the scattering contrast temperature dependence. This fact can be used for determination of the scattering contrast without a knowledge of the compositions of the individual phases. The theoretical expressions derived for scattering contrast were proven experimentally on an Ni–Fe-base alloy, DT706. The evolution of lattice parameters of both the matrix and the precipitate phases was obtained from anin situwide-angle neutron diffraction experiment. The theoretical scattering contrast dependence was then successfully fitted to the measured SANS integral intensity.

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