SESANS

1-D ultra low Q Small angle neutron scattering

Spin-echo small-angle neutron scattering (SESANS), is a novel scattering technique which measures a projection of the real-space Debye correlation function. SESANS gives a real space two-particle correlation function with a number of advantages over the conventional SANS. It can access a wider range of length scales than SANS making it suitable for measuring length scales from a few tens of nm to a few microns. It overcomes the issue of multiple scattering in dense colloidal suspensions which hinders the application of dynamic light scattering, microscopy and SANS in surveying concentrated dispersions close to their phase transition points. 

A real space technique performs the Fourier transform of the conventional I(Q) function [1].

SESANS is also a magnetic interferometer, where the separation of the two spin states is denoted as spin echo length.

Multiple scattering thus concentrate sample can be allowed.

Specifications

Please refer to the “calculation” tab for more info.

Length scale

50- 1000nm

Magnetic sample

No

stronger scatter

Yes

Applications

Soft matter

  • Aggregation of colloidal dispersions
  • Structure of natural composites
  • Structure of complex fluids
  • Structure of polymer blends

Hard matter

  • Grandular materials
  • Structure of ceramics
  • Porosity of rocks
  • Grains of metal alloys

Pictures

Take a peek inside our work!

References

 
  1. Analysis of spin-echo small-angle neutron scattering measurements, R. Andersson and et al,  J. Appl. Cryst. (2008). 41, 868–885.
  2. Spin echo small angle neutron scattering using a continuously pumped 3He neutron polarization analyzer, S. Parnell and et al, Rev. of Sci. Instru., (2015), 86, 023902.
  3. Inter-particle correlations in a hard-sphere colloidal suspension with polymer additives investigated by Spin Echo Small Angle Neutron Scattering (SESANS), A. Washington and et al, Soft Matter, (2014), 10, 3016.
  4. Prospect for characterizing interacting soft colloidal structures using spin-echo small angle neutron scattering, X. Li and et al., J. Chem. Phys. (2011), 134, 09450.
  5. Porosity of silica Stober particles determined by spin-echo small angle neutron scattering, S. Parnell and et al, Soft Matter, 2016, 12, 4709.
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