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@ARTICLE{Dhont:27208,
      author       = {Dhont, J. K. G. and Wagner, N. J.},
      title        = {{S}uperposition rheology},
      journal      = {Physical review / E},
      volume       = {63},
      number       = {2},
      issn         = {1063-651X},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-27208},
      pages        = {021406},
      year         = {2001},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The interpretation of superposition rheology data is still
                      a matter of debate due to lack of understanding of
                      viscoelastic superposition response on a microscopic level.
                      So far, only phenomenological approaches have been
                      described, which do not capture the shear induced
                      microstructural deformation, which is responsible for the
                      viscoelastic behavior to the superimposed flow.
                      Experimentally there are indications that there is a
                      fundamental difference between the viscoelastic response to
                      an orthogonally and a parallel superimposed shear flow. We
                      present theoretical predictions, based on microscopic
                      considerations, for both orthogonal and parallel
                      viscoelastic response functions for a colloidal system of
                      attractive particles near their gas-liquid critical point.
                      These predictions extend to values of the stationary shear
                      rate where the system is nonlinearly perturbed, and are
                      based on considerations on the colloidal particle level. The
                      difference in response to orthogonal and parallel
                      superimposed shear flow can be understood entirely in terms
                      of microstructural distortion, where the anisotropy of the
                      microstructure under shear flow conditions is essential. In
                      accordance with experimental observations we find pronounced
                      negative values for response functions in case of parallel
                      superposition for an intermediate range of frequencies,
                      provided that microstructure is nonlinearly perturbed by the
                      stationary shear component. For the critical colloidal
                      systems considered here, the Kramers-Kronig relations for
                      the superimposed response Functions are found to be valid.
                      It is argued, however, that the Kramers-Kronig relations may
                      be violated for systems where the stationary shear flow
                      induces a considerable amount of new microstructure.},
      keywords     = {J (WoSType)},
      cin          = {IFF-WM},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB36},
      pnm          = {Polymere, Membranen und komplexe Flüssigkeiten},
      pid          = {G:(DE-Juel1)FUEK53},
      shelfmark    = {Physics, Fluids $\&$ Plasmas / Physics, Mathematical},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000167022300044},
      doi          = {10.1103/PhysRevE.63.021406},
      url          = {https://juser.fz-juelich.de/record/27208},
}