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@ARTICLE{Li:858722,
      author       = {Li, Run and Ripoll, Marisol and Reddy, Naveen and Dhont,
                      Jan K. G. and Dierick, Ruben and Hens, Zeger and Clasen,
                      Christian},
      title        = {{T}umbling of {Q}uantum {D}ots: {R}heo-{O}ptics},
      journal      = {Langmuir},
      volume       = {34},
      number       = {48},
      issn         = {1520-5827},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {FZJ-2018-07567},
      pages        = {14633 - 14642},
      year         = {2018},
      abstract     = {Linear flow dichroism is shown to be a powerful tool to
                      characterize the hydrodynamic dimensions of extremely small
                      nonspherical colloids in solution. Dispersions of prolate
                      and oblate quantum dots (QDs) are employed to investigate
                      the validity of flow dichroism as a characterization tool.
                      Shape-anisotropic QDs are important from an application
                      perspective, where it is necessary to have a good knowledge
                      of their hydrodynamic dimensions to predict and control
                      their orientation during solution processing. Flow dichroism
                      quantifies the tumbling motion of QDs in shear flow by
                      optical means, which provides a characteristic signature of
                      the particle shape, hydrodynamic friction, and size
                      distribution. The effects of particle size and shape, size
                      polydispersity, and shear rate on the temporal evolution of
                      the flow-induced alignment are discussed in detail on the
                      basis of numerical solutions of the Smoluchowski equation
                      that describes the motion for the probability of the
                      orientation of colloids in shear flow. It is shown that the
                      combination of flow-dichroism experiments and the
                      theoretical approach on the basis of the Smoluchowski
                      equation provides a means to measure hydrodynamic aspect
                      ratios and polydispersity, which for such small particles is
                      not feasible with standard methods similar to light
                      scattering. Flow dichroism will be useful not only for
                      shape-anisotropic colloidal QDs, but also for other
                      nanoscale systems.},
      cin          = {ICS-2 / ICS-3},
      ddc          = {540},
      cid          = {I:(DE-Juel1)ICS-2-20110106 / 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:30392379},
      UT           = {WOS:000452693100019},
      doi          = {10.1021/acs.langmuir.8b02498},
      url          = {https://juser.fz-juelich.de/record/858722},
}