Spin echo small angle neutron scattering

Short description: Measure of structures from around 20 to 2000 nm in size

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* Neutron tomography
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For broader coverage of this topic, see Small-angle scattering.

Spin echo small angle neutron scattering (SESANS) is the small-angle version of neutron spin echo scattering. The information is presented as a real-space (similar to g(r)) as opposed to a reciprocal space (q(r)) mapping. This can simplify the interpretation for some systems.[1]

SESANS is useful for studying processes that occur for large structures over relatively long time scales, as data collection is often slow. It can achieve a resolution from around 20 to 2000 nm. Aggregation of colloids,[2] block copolymer micelles,[3] Stöber silica particles[4] being a prime examples.

The technique offers some advantages over SANS[5] but there are fewer SESANS instruments available than SANS instruments. Facilities for SESANS exist at TUDelft (Netherlands)[6] and Rutherford Appleton Laboratory (UK).[7]

## References

1. ↑ "Spin-echo small-angle neutron scattering SESANS". https://www.tudelft.nl/en/faculty-of-applied-sciences/about-faculty/departments/radiation-science-technology/research/research-groups/neutron-positron-methods-for-materials/research-facilities/spin-echo-small-angle-neutron-scattering-sesans/.
2. ↑ "Colloidal phase diagram studied by SESANS". https://www.tudelft.nl/en/faculty-of-applied-sciences/about-faculty/departments/radiation-science-technology/neutron-positron-methods-for-materials/research-facilities/spin-echo-small-angle-neutron-scattering-sesans/colloidal-phase-diagram-studied-by-sesans/.
3. ↑ Smith, Gregory N.; Cunningham, Victoria J.; Canning, Sarah L.; Derry, Matthew J.; Cooper, J. F. K.; Washington, A. L.; Armes, Steven P. (2019). "Spin-echo small-angle neutron scattering (SESANS) studies of diblock copolymer nanoparticles" (in en). Soft Matter 15 (1): 17–21. doi:10.1039/C8SM01425F. ISSN 1744-683X. PMID 30520930. Bibcode: 2019SMat...15...17S. http://xlink.rsc.org/?DOI=C8SM01425F.
4. ↑ Parnell, S. R.; Washington, A. L.; Parnell, A. J.; Walsh, A.; Dalgliesh, R. M.; Li, F.; Hamilton, W. A.; Prevost, S. et al. (2016). "Porosity of silica Stöber particles determined by spin-echo small angle neutron scattering" (in en). Soft Matter 12 (21): 4709–4714. doi:10.1039/C5SM02772A. ISSN 1744-683X. PMID 27021920. Bibcode: 2016SMat...12.4709P. http://xlink.rsc.org/?DOI=C5SM02772A.
5. ↑ Rehm, Christine; Barker, John; Bouwman, Wim G.; Pynn, Roger (2013-04-01). "DCD USANS and SESANS: a comparison of two neutron scattering techniques applicable for the study of large-scale structures". Journal of Applied Crystallography 46 (2): 354–364. doi:10.1107/S0021889812050029. ISSN 0021-8898. Bibcode: 2013JApCr..46..354R. http://scripts.iucr.org/cgi-bin/paper?S0021889812050029.
6. ↑ "SESANS" (in en). https://www.tudelft.nl/en/faculty-of-applied-sciences/business/facilities/reactor-institute-delft/research-instruments/sesans/.
7. ↑ "ISIS Larmor". https://www.isis.stfc.ac.uk/Pages/Larmor.aspx.

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