X-ray scattering in the vorticity direction and rheometry from confined fluids
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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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PFLEIDERER, Patrick, Seung Jae BAIK, Zhenkun ZHAMG, Giovanni VLEMINCKX, Minnie Paul LETTINGA, Eric GRELET, Jan VERMANT, Christian CLASEN, 2014. X-ray scattering in the vorticity direction and rheometry from confined fluids. In: Review of Scientific Instruments. 2014, 85, 065108. ISSN 0034-6748. eISSN 1089-7623. Available under: doi: 10.1063/1.4881796BibTex
@article{Pfleiderer2014scatt-29868, year={2014}, doi={10.1063/1.4881796}, title={X-ray scattering in the vorticity direction and rheometry from confined fluids}, volume={85}, issn={0034-6748}, journal={Review of Scientific Instruments}, author={Pfleiderer, Patrick and Baik, Seung Jae and Zhamg, Zhenkun and Vleminckx, Giovanni and Lettinga, Minnie Paul and Grelet, Eric and Vermant, Jan and Clasen, Christian}, note={Article Number: 065108} }
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