SANS

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.

Porosity of the Marcellus Shale: A contrast matching small-angle neutron scattering study

2018 ◽  
Vol 188 ◽  
pp. 156-164 ◽  
Author(s):  
Jitendra Bahadur ◽  
Leslie F. Ruppert ◽  
Vitaliy Pipich ◽  
Richard Sakurovs ◽  
Yuri B. Melnichenko
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Marcellus Shale ◽  
Scattering Study ◽  
Neutron Scattering Study ◽  
Contrast Matching

scholarly journals Small Angle Neutron Scattering from Nanophase Titanium As A Function of Oxidation

1988 ◽  
Vol 132 ◽  
Author(s):  
J. A. Eastman ◽  
J. E. Epperson ◽  
H. Hahn ◽  
T. E. Klippert ◽  
A. Narayanasamy ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Scattering Length ◽  
Contrast Variation ◽  
Gas Condensation ◽  
Pressure Oxygen ◽  
Scattering Centers ◽  
Scattering Lengths ◽  
Contrast Matching

ABSTRACTNanophase titanium, prepared by the gas-condensation method both as aggregated powder and in lightly compacted discs, has been studied by conventional small angle neutron scattering, and by use of contrast variation methods. The contrast has been changed (a), isotopically, by means of deuterated/protonated solvents distilled into the specimen and (b) by progressive incremental oxidation of the Ti particles using fixed doses of low-pressure oxygen. It was shown that some evolution of the small angle pattern for lightly compacted nanophase Ti occurred over a period of several months at 300 K. Contrast matching by external solvent works well and has allowed the scattering lengths of oxidized and unoxidized specimens to be followed. The results imply that the scattering from metal and oxide can be separated under suitable conditions. The partial oxidation experiments indicate that there is both a fast and slow oxidation at 300 K. Also, during slow oxidation, high scattering length density scattering centers were formed whose number increased, but whose size remained the same at about 2 nm; these centers are tentatively assumed to be TiO2.

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

2013 ◽  
Vol 46 (5) ◽  
pp. 1361-1371 ◽  
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.

Phase contrast matching in lamellar structures composed of mixtures of labeled and unlabeled block copolymer for small-angle neutron scattering

1988 ◽  
Vol 21 (6) ◽  
pp. 1802-1806 ◽  
Author(s):  
Yushu Matsushita ◽  
Yasushi Nakao ◽  
Ryuichi Saguchi ◽  
Katsuaki Mori ◽  
Haruhisa Choshi ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Phase Contrast ◽  
Lamellar Structures ◽  
Contrast Matching

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

Soft Matter ◽  
2019 ◽  
Vol 15 (31) ◽  
pp. 6369-6374 ◽  
Author(s):  
Sofi Nöjd ◽  
Christopher Hirst ◽  
Marc Obiols-Rabasa ◽  
Julien Schmitt ◽  
Aurel Radulescu ◽  
...  
Keyword(s):  
Electric Field ◽  
Neutron Scattering ◽  
External Electric Field ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Contrast Study ◽  
Soft Particles ◽  
Average Contrast ◽  
The Individual ◽  
Individual Particles

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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