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000893818 1001_ $$0P:(DE-HGF)0$$aChen, Y.$$b0
000893818 245__ $$aProbing nonlinear velocity profiles of shear-thinning, nematic platelet dispersions in Couette flow using x-ray photon correlation spectroscopy
000893818 260__ $$a[S.l.]$$bAmerican Institute of Physics$$c2021
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000893818 520__ $$aWe report experiments employing x-ray photon correlation spectroscopy (XPCS) to characterize the velocity profiles of complex fluids in Couette flow.  The approach involves modeling the XPCS correlation functions obtained with the incident x-ray beam passing tangentially through the Couette cell gap at various distances from the inner wall.  We first demonstrate the technique with measurements on a dilute colloidal dispersion in the Newtonian liquid glycerol, where the expected linear velocity profiles are recovered.  We then employ the technique to map the shear-rate-dependent velocity profiles of a shear-thinning dispersion of nematically ordered Gibbsite platelets.  The nonlinear velocity profiles of the Gibbsite dispersion include a narrow slip region adjacent to the outer wall and a band with small velocity gradient in the interior of the gap that evolves into a region increasingly resembling plug flow with increasing shear rate.  Variations in the velocity profile along the vorticity direction indicate an instability in the interface between this region of small velocity gradient and a region of high velocity gradient near the inner wall.  Analysis of the small-angle scattering patterns provides information about the spatial and temporal variations in the nematic order of the Gibbsite dispersion and their coupling to the velocity profile.  Additional potential applications of this XPCS-based technique and comparisons with established methods for characterizing velocity profiles are discussed.
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000893818 7001_ $$0P:(DE-Juel1)188512$$aKorculanin, Olivera$$b1
000893818 7001_ $$00000-0002-2888-5379$$aNarayanan, S.$$b2
000893818 7001_ $$0P:(DE-Juel1)130577$$aBuitenhuis, J.$$b3
000893818 7001_ $$00000-0002-3432-5044$$aRogers, S. A.$$b4
000893818 7001_ $$00000-0002-8924-1622$$aLeheny, R. L.$$b5
000893818 7001_ $$0P:(DE-Juel1)130797$$aLettinga, M. P.$$b6$$eCorresponding author
000893818 773__ $$0PERI:(DE-600)1472743-2$$a10.1063/5.0050942$$gVol. 33, no. 6, p. 063102 -$$n6$$p063102 -$$tPhysics of fluids$$v33$$x1089-7666$$y2021
000893818 8564_ $$uhttps://juser.fz-juelich.de/record/893818/files/5.0050942.pdf$$yPublished on 2021-06-03. Available in OpenAccess from 2022-06-03.
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