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@ARTICLE{Reddy:16099,
      author       = {Reddy, N.K. and Pérez-Juste, J. and Pastoriza-Santos, I.
                      and Lang, P.R. and Dhont, J.K.G. and Liz-Marzan, L. and
                      Vermant, J.},
      title        = {{F}low dichroism as a reliable method to measure the
                      hydrodynamic aspect ratio of gold nanoparticles},
      journal      = {ACS nano},
      volume       = {5},
      issn         = {1936-0851},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {PreJuSER-16099},
      pages        = {4935 - 4944},
      year         = {2011},
      note         = {The authors thank Dr. P. Holmqvist for useful discussions.
                      We thank the EU for funding through the project NANODIRECT
                      (Grant No. CP-FP 213948-2).},
      comment      = {ACS Nano, 2011, 5 (6), 4935 – 4944},
      booktitle     = {ACS Nano, 2011, 5 (6), 4935 – 4944},
      abstract     = {Particle shape plays an important role in controlling the
                      optical, magnetic, and mechanical properties of nanoparticle
                      suspensions as well as nanocomposites. However,
                      characterizing the size, shape, and the associated
                      polydispersity of nanoparticles is not straightforward.
                      Electron microscopy provides an accurate measurement of the
                      geometric properties, but sample preparation can be
                      laborious, and to obtain statistically relevant data many
                      particles need to be analyzed separately. Moreover, when the
                      particles are suspended in a fluid, it is important to
                      measure their hydrodynamic properties, as they determine
                      aspects such as diffusion and the rheological behavior of
                      suspensions. Methods that evaluate the dynamics of
                      nanoparticles such as light scattering and rheo-optical
                      methods accurately provide these hydrodynamic properties,
                      but do necessitate a sufficient optical response. In the
                      present work, three different methods for characterizing
                      nonspherical gold nanoparticles are critically compared,
                      especially taking into account the complex optical response
                      of these particles. The different methods are evaluated in
                      terms of their versatility to asses size, shape, and
                      polydispersity. Among these, the rheo-optical technique is
                      shown to be the most reliable method to obtain hydrodynamic
                      aspect ratio and polydispersity for nonspherical gold
                      nanoparticles for two reasons. First, the use of the
                      evolution of the orientation angle makes effects of
                      polydispersity less important. Second, the use of an
                      external flow field gives a mathematically more robust
                      relation between particle motion and aspect ratio,
                      especially for particles with relatively small aspect
                      ratios.},
      keywords     = {Gold: chemistry / Hydrodynamics / Light / Metal
                      Nanoparticles: chemistry / Microscopy, Electron: methods /
                      Microscopy, Electron, Transmission: methods / Models,
                      Statistical / Nanoparticles / Nanotechnology: methods /
                      Optics and Photonics / Particle Size / Rheology: methods /
                      Scattering, Radiation / Gold (NLM Chemicals) / J (WoSType) /
                      transmission electron microscopy / Brownian motion / Jeffery
                      orbits / depolarized dynamic light scattering},
      cin          = {ICS-3},
      ddc          = {540},
      cid          = {I:(DE-Juel1)ICS-3-20110106},
      pnm          = {BioSoft: Makromolekulare Systeme und biologische
                      Informationsverarbeitung / NANODIRECT - Toolbox for Directed
                      and Controlled Self-Assembly of nano-Colloids (213948)},
      pid          = {G:(DE-Juel1)FUEK505 / G:(EU-Grant)213948},
      shelfmark    = {Chemistry, Multidisciplinary / Chemistry, Physical /
                      Nanoscience $\&$ Nanotechnology / Materials Science,
                      Multidisciplinary},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:21545088},
      UT           = {WOS:000292055200079},
      doi          = {10.1021/nn201033x},
      url          = {https://juser.fz-juelich.de/record/16099},
}