Gruijthuijsen, Kitty van Herle, Vishweshwara Tuinier, Remco Schurtenberger, Peter Stradner, Anna 2011-12-12 We explore the properties of casein/xanthan mixtures for xanthan concentrations beyond those inducing phase separation. Previous work has successfully described the onset of demixing by depletion theory in the protein limit, where the xanthan polysaccharides , the polymers , are larger than the caseins from skim milk powder, the colloids (S. Bhat et al., J. Phys.: Condens. Matter, 2006, L339). We now extend these studies to xanthan concentrations in a range of c/c* = 13–88, aiming to arrest the phase separation via a (transiently) arrested casein-rich phase. Surprisingly, we find that the casein-rich phase remains fluidic deep into the two-phase region, with an equilibrium composition that significantly differs from predictions for mixtures of hard spheres plus flexible polymer chains in a good solvent . Furthermore, we show that macroscopic phase separation is arrested for c/c* > 60. Our investigations reveal that the rheological properties of the mixtures are fully determined by the xanthan-rich phase with characteristic long relaxation times that depend remarkably strongly on the xanthan concentration. application/pdf https://folia.unifr.ch/global/documents/302556 https://folia.unifr.ch/documents/302556/files/her_osd.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1039/C1SM06761C info:eu-repo/semantics/openAccess License undefined Soft Matter. - 2012, vol. 8, no. 5, p. 1547-1555 info:eu-repo/classification/udc/53 Origin of suppressed demixing in casein/xanthan mixtures http://purl.org/coar/resource_type/c_6501