X-ray scattering in the vorticity direction and rheometry from confined fluids

Pfleiderer, P.; Zhang, Z.; Grelet, E.; Baik, S. J.; Clasen, C.; Lettinga, M.P.; Vleminckx, G.; Vermant, J.

doi:10.1063/1.4881796

Journal Article

FZJ-2014-04807

X-ray scattering in the vorticity direction and rheometry from confined fluids

Pfleiderer, P. ; Baik, S. J. ; Zhang, Z. ; Vleminckx, G. ; Lettinga, M. P.FZJ* ; Grelet, E. ; Vermant, J. ; Clasen, C.

2014
Inst. London

Journal of scientific instruments 85(6), 065108 (2014) [10.1063/1.4881796]

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Please use a persistent id in citations: doi:10.1063/1.4881796

Abstract: An X-ray flexure-based microgap rheometer (X-FMR) has been designed for combining rheology and in situ small-angle X-ray scattering from the vorticity plane. The gap distance can be varied continuously from 500 μm down to several μm, which provides the unique possibility to generate a strong confinement for many complex fluids. A singular advantage of this setup is the possibility to directly probe the vorticity direction of the flow field with a microfocus X-ray beam and to probe the structural response of the fluid to combined shear and confinement in the vorticity plane. The sliding-plate setup operates over a wide range of shear rates of γ̇ = 10−3–103 s−1 and strains in the range of 10−4–102. The flexure-based bearing maintains the plate parallelism within 10−5 rad. The X-FMR requires very small sample volumes on the order of 10 μl. The applicability of the device is demonstrated here with limited examples of a nematic suspension of fd virus (rods), and a crystalline suspension containing sterically stabilized polystyrene-butylacrylate latex particles.

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