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@ARTICLE{Jacob:276277,
      author       = {Jacob, Alan R. and Poulos, Andreas S. and Kim, Sunhyung and
                      Vermant, Jan and Petekidis, George},
      title        = {{C}onvective {C}age {R}elease in {M}odel {C}olloidal
                      {G}lasses},
      journal      = {Physical review letters},
      volume       = {115},
      number       = {21},
      issn         = {1079-7114},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2015-06739},
      pages        = {218301},
      year         = {2015},
      abstract     = {The mechanism of flow in glassy materials is interrogated
                      using mechanical spectroscopy applied to model nearly hard
                      sphere colloidal glasses during flow. Superimposing a small
                      amplitude oscillatory motion orthogonal onto steady shear
                      flow makes it possible to directly evaluate the effect of a
                      steady state flow on the out-of-cage (α) relaxation as well
                      as the in-cage motions. To this end, the crossover frequency
                      deduced from the viscoelastic spectra is used as a direct
                      measure of the inverse microstructural relaxation time,
                      during flow. The latter is found to scale linearly with the
                      rate of deformation. The microscopic mechanism of flow can
                      then be identified as a convective cage release. Further
                      insights are provided when the viscoelastic spectra at
                      different shear rates are shifted to scale the alpha
                      relaxation and produce a strain rate-orthogonal frequency
                      superposition, the colloidal analogue of time temperature
                      superposition in polymers with the flow strength playing the
                      role of temperature. Whereas the scaling works well for the
                      α relaxation, deviations are observed both at low and high
                      frequencies. Brownian dynamics simulations point to the
                      origins of these deviations; at high frequencies these are
                      due to the deformation of the cages which slows down the
                      short-time diffusion, while at low frequency, deviations are
                      most probably caused by some mild hydroclustering.},
      cin          = {ICS-1 / Neutronenstreuung ; JCNS-1},
      ddc          = {550},
      cid          = {I:(DE-Juel1)ICS-1-20110106 / I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {551 - Functional Macromolecules and Complexes (POF3-551) /
                      6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
                      / 6215 - Soft Matter, Health and Life Sciences (POF3-621)},
      pid          = {G:(DE-HGF)POF3-551 / G:(DE-HGF)POF3-6G4 /
                      G:(DE-HGF)POF3-6215},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000364910500014},
      pubmed       = {pmid:26636876},
      doi          = {10.1103/PhysRevLett.115.218301},
      url          = {https://juser.fz-juelich.de/record/276277},
}