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@ARTICLE{Renou:12073,
      author       = {Renou, F. and Stellbrink, J. and Petekidis, G.},
      title        = {{Y}ielding processes in a colloidal glass of soft star-like
                      micelles under large amplitude oscillatory shear ({LAOS})},
      journal      = {Journal of rheology online},
      volume       = {54},
      issn         = {0148-6055},
      address      = {Melville, NY [u.a.]},
      publisher    = {Inst.},
      reportid     = {PreJuSER-12073},
      pages        = {1219 - 1242},
      year         = {2010},
      note         = {We thank Nikos Koumakis and Andreas Poulos for valuable
                      discussions and technical assistance and Simon Rogers for
                      fruitful discussions. We also acknowledge Randy Ewoldt for
                      providing the MITLAOS software for the Chebyshev
                      decomposition. This work has been supported by the EU
                      funding through NoE Softcomp, ToK Cosines, and NMP SMALL
                      Nanodirect. J.S. acknowledges DFG for support via SFB-TR6.},
      abstract     = {The understanding of yielding and flow of a colloidal glass
                      under large amplitude oscillatory shear (LAOS) represents a
                      motivating challenge. Monitoring the higher harmonics in the
                      stress signal by Fourier-transform (FT) rheology may provide
                      useful insight on the progressive transition from linear to
                      nonlinear viscoelastic response. However, the physical
                      interpretation of FT-rheology data is still not obvious.
                      Here we study the process of yielding in a colloidal glass
                      formed by star-like block copolymer micelles with LAOS
                      experiments and interrogate the nonlinear intracycle stress
                      response by FT analysis and decomposition to an orthogonal
                      set of Chebyshev polynomials [Ewoldt, R. H., et al. J.
                      Rheol. 52(6), 1427-1458 (2008)]. Such approach provides a
                      robust framework enabling us to map out a rich phenomenology
                      of intracylce nonlinearities that may relate to distinct
                      physical mechanisms. We find that the nonlinearities during
                      yielding are represented by intracylce shear
                      thickening/thinning and strain hardening/softening of the
                      viscous and elastic response of the system, respectively. We
                      suggest that the underlying mechanisms are related to cage
                      breaking and reformation as well as stress storing and
                      relaxation within the period of oscillatory shear which are
                      affected by an interplay between shear and Brownian motions
                      and thus relate to Peclet number variation with strain and
                      frequency. (C) 2010 The Society of Rheology. [DOI:
                      10.1122/1.3483610]},
      keywords     = {J (WoSType)},
      cin          = {IFF-5 / IFF-4 / Jülich Centre for Neutron Science JCNS
                      (JCNS) ; JCNS},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB785 / I:(DE-Juel1)VDB784 /
                      I:(DE-Juel1)JCNS-20121112},
      pnm          = {BioSoft: Makromolekulare Systeme und biologische
                      Informationsverarbeitung / Großgeräte für die Forschung
                      mit Photonen, Neutronen und Ionen (PNI)},
      pid          = {G:(DE-Juel1)FUEK505 / G:(DE-Juel1)FUEK415},
      shelfmark    = {Mechanics},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000283505000004},
      doi          = {10.1122/1.3483610},
      url          = {https://juser.fz-juelich.de/record/12073},
}