GISANS is the acronyme for Grazing Incidence Small-Angle Neutron Scattering.
By restricting the divergence of the incoming beam in the direction perpendicular to the scattering plane three dimensional information becomes accessible.
The picture shows the arrangement of polymer micelles with a diameter of about 180 Å close to a hydrophilic and a hydrophobic coated silicon wafer.
For the top panels the sample is in a liquid phase.
The ring of increased intensity corresponds to the liquid structure factor and the distance between two micelles. The bottom panels show the sample in a crystalline cubic phase.
Close to the hydrophilic interface a cubic close packed structure is formed whereas close to the hydrophobic interface a three dimensional powder with a cubic face centred structure is formed.