Spin echo small angle neutron scattering

Measure of structures from around 20 to 2000 nm in size

Science with neutrons

Foundations

* Neutron temperature
* Flux, Radiation, Transport
* Cross section, Absorption, Activation

Neutron scattering

* Neutron diffraction
* Small-angle neutron scattering
* GISANS
* Reflectometry
* Inelastic neutron scattering
* Triple-axis spectrometer
* Time-of-flight spectrometer
* Backscattering spectrometer
* Spin-echo spectrometer

Other applications

* Neutron tomography
* Activation analysis, Prompt gamma activation analysis
* Fundamental research with neutrons: Ultracold neutrons, Interferometry
* Fast neutron therapy
* Neutron capture therapy

Infrastructure

* Neutron sources: Research reactor, Spallation, Neutron moderator
* Neutron optics: Reflector, Supermirror
* Detection

Neutron facilities

* America: HFIR, LANSCE, NIST CNR -SNS
* Australia: OPAL
* Asia: J-PARC, HANARO
* Europe: BER II, FRM II, ILL, ISIS Neutron and Muon Source, JINR, SINQ
* Historic: IPNS, HFBR
* Under construction: ESS

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

Spin echo small angle neutron scattering (SESANS) measures structures from around 20 to 2000 nm in size. 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 over relatively long time scales, as data collection is often slow, but large length scales. 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

[edit]

1. ^ "Spin-echo small-angle neutron scattering SESANS". TUDelft.
2. ^ "Colloidal phase diagram studied by SESANS". TUDeltf.
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". Soft Matter. 15 (1): 17–21. Bibcode:2019SMat...15...17S. doi:10.1039/C8SM01425F. ISSN 1744-683X. PMID 30520930. S2CID 54561253.
4. ^ Parnell, S. R.; Washington, A. L.; Parnell, A. J.; Walsh, A.; Dalgliesh, R. M.; Li, F.; Hamilton, W. A.; Prevost, S.; Fairclough, J. P. A.; Pynn, R. (2016). "Porosity of silica Stöber particles determined by spin-echo small angle neutron scattering". Soft Matter. 12 (21): 4709–4714. Bibcode:2016SMat...12.4709P. doi:10.1039/C5SM02772A. ISSN 1744-683X. PMID 27021920.
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. Bibcode:2013JApCr..46..354R. doi:10.1107/S0021889812050029. ISSN 0021-8898.
6. ^ "SESANS". TU Delft. Retrieved 2019-10-28.
7. ^ "ISIS Larmor". www.isis.stfc.ac.uk. Retrieved 2019-10-28.

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