000834305 001__ 834305 000834305 005__ 20240619083539.0 000834305 0247_ $$2doi$$a10.1103/PhysRevE.95.062601 000834305 0247_ $$2ISSN$$a1063-651X 000834305 0247_ $$2ISSN$$a1095-3787 000834305 0247_ $$2ISSN$$a1539-3755 000834305 0247_ $$2ISSN$$a1550-2376 000834305 0247_ $$2ISSN$$a2470-0045 000834305 0247_ $$2ISSN$$a2470-0053 000834305 0247_ $$2Handle$$a2128/14753 000834305 0247_ $$2WOS$$aWOS:000402676300008 000834305 037__ $$aFZJ-2017-04287 000834305 082__ $$a530 000834305 1001_ $$0P:(DE-HGF)0$$aNygard, Kim$$b0$$eCorresponding author 000834305 245__ $$aAnisotropic hydrodynamic function of dense confined colloids 000834305 260__ $$aWoodbury, NY$$bInst.$$c2017 000834305 264_1 $$2Crossref$$3online$$bAmerican Physical Society (APS)$$c2017-06-02 000834305 264_1 $$2Crossref$$3print$$bAmerican Physical Society (APS)$$c2017-06-01 000834305 3367_ $$2DRIVER$$aarticle 000834305 3367_ $$2DataCite$$aOutput Types/Journal article 000834305 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1498497224_10860 000834305 3367_ $$2BibTeX$$aARTICLE 000834305 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000834305 3367_ $$00$$2EndNote$$aJournal Article 000834305 520__ $$aDense colloidal dispersions exhibit complex wave-vector-dependent diffusion, which is controlled by both direct particle interactions and indirect nonadditive hydrodynamic interactions mediated by the solvent. In bulk the hydrodynamic interactions are probed routinely, but in confined geometries their studies have been hitherto hindered by additional complications due to confining walls. Here we solve this issue by combining high-energy x-ray photon correlation spectroscopy and small-angle x-ray-scattering experiments on colloid-filled microfluidic channels to yield the confined fluid's hydrodynamic function in the short-time limit. Most importantly, we find the confined fluid to exhibit a strongly anisotropic hydrodynamic function, similar to its anisotropic structure factor. 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