Title: X-ray scattering in the vorticity direction and rheometry from confined fluids
Authors: Pfleiderer, Patrick
Baik, Seung Jae
Zhang, Zhenkun
Vleminckx, Giovanni
Lettinga, Pavlik
Grelet, Eric
Vermant, Jan
Clasen, Christian # ×
Issue Date: 13-Jun-2014
Publisher: American Institute of Physics
Series Title: Review of Scientific Instruments vol:85 issue:6
Article number: 065108
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 possibil- ity 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 γ ̇ = 10^−3 – 10^3 s^−1 and strains in the range of 10^−4 – 10^2. 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.
ISSN: 0034-6748
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter, Rheology and Technology Section
Soft Matter and Biophysics
× corresponding author
# (joint) last author

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