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@ARTICLE{Tang:844896,
      author       = {Tang, H. and Kochetkova, T. and Kriegs, H. and Dhont, Jan
                      K.G. and Lettinga, M. P.},
      title        = {{S}hear-banding in entangled xanthan solutions: tunable
                      transition from sharp to broad shear-band interfaces},
      journal      = {Soft matter},
      volume       = {14},
      number       = {5},
      issn         = {1744-6848},
      address      = {London},
      publisher    = {Royal Soc. of Chemistry},
      reportid     = {FZJ-2018-02238},
      pages        = {826 - 836},
      year         = {2018},
      abstract     = {We report on the smooth transition between gradient-banded
                      velocity profiles with a sharp interface and curved velocity
                      profiles, both resulting from strong shear-thinning
                      dispersions of concentrated xanthan (a highly charged
                      poly-saccharide). Pronounced shear-banded flow, where two
                      extended shear-bands are separated by a relatively sharp
                      interface, is observed in a limited range of shear rates, at
                      very low ionic strength and at a high concentration, using
                      heterodyne light scattering to measure spatially resolved
                      velocity profiles. The width of the interface between the
                      coexisting shear-bands broadens to span a sizable fraction
                      of the gap of the shear cell, either by changing the shear
                      rate, by lowering the concentration, or by increasing the
                      ionic strength. The broadening results in a smooth
                      transition to highly curved velocity profiles and is
                      connected to a disappearing flow birefringence. Thus, these
                      experiments show that the classic shear-banding instability
                      can give rise to highly curved velocity profiles, due to the
                      existence of broad interfaces between the bands, with an
                      extent of the order or larger than the cell gap width. This
                      observation may aid to resolve the ongoing dispute
                      concerning shear-banding of highly entangled polymeric
                      systems, suggesting that the curved velocity profiles that
                      have been observed in the past are in fact shear-banded
                      states with an unusually broad interface.},
      cin          = {ICS-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)ICS-3-20110106},
      pnm          = {551 - Functional Macromolecules and Complexes (POF3-551)},
      pid          = {G:(DE-HGF)POF3-551},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:29308827},
      UT           = {WOS:000423996300017},
      doi          = {10.1039/C7SM01734K},
      url          = {https://juser.fz-juelich.de/record/844896},
}