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Updated: Aug 9, 2026
Measuring Material Microstructure Under Flow Using 1-2 Plane Flow-Small Angle Neutron Scattering
Published on: February 6, 2014
Direct observation of shear-induced orientational phase coexistence in a lyotropic system using a modified x-ray
Y Golan1, A Martin-Herranz, Y Li
1Materials Department, Materials Research Laboratory, University of California, Santa Barbara, California, 93106, USA. ygolan@bgumail.bu.ac.il
Abstract:
The second generation x-ray surface forces apparatus (XSFA-II) allows for the first time simultaneous in situ small-angle x-ray scattering and surface force measurements. We have used the XSFA-II to monitor shear-induced orientational transitions in a lyotropic model lubricant system. Upon applying small shear amplitudes (approximately 20 micrometer) to a relatively thick (approximately 800 micrometer) film, we observed evidence for the formation of an orientational boundary layer at the shearing surface. Time-resolved x-ray diffraction revealed the gradual transition to shear-favored orientation by growth of the boundary layer.
