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@INPROCEEDINGS{Lang:849730,
      author       = {Lang, Peter R. and Liu, Yi and De Sio, Silvia and Dhont,
                      Jan K.G.},
      title        = {{P}article {W}all {I}nteractions and {N}ear-{W}all
                      {D}ynamics of {C}olloidal {S}pheres in {C}rowded
                      {E}nvironments},
      reportid     = {FZJ-2018-03862},
      year         = {2018},
      abstract     = {Over the last decade we developed instrumental equipment,
                      based on evanescent wave light scattering, to investigate
                      the static interaction of colloidal particles with an
                      adjacent wall, as well as the near wall dynamics of these
                      particles. In this presentation, I will give an introduction
                      to the techniques, before discussing several
                      experiments.Using Total internal Reflection Microscopy
                      (TIRM), we investigated the depletion interaction between a
                      colloidal probe sphere and a flat wall, induced by rod–
                      and disc– shaped particles at rest [1,2] and under the
                      influence of flow fields. There we could show that the
                      strength of these depletion potentials can be tuned by the
                      applied shear rate [2].Further we studied the near wall
                      dynamics of a single probe sphere in a crowded environment
                      of rods by TIRM. The standard approach extract dynamic
                      information from TIRM data is extracting the probe
                      particle’s diffusion coefficient normal to the wall from
                      the mean square displacement (MSD) vs. time curves. However,
                      in the course of our investigation we discovered that it is
                      more reliable to determine the particle’s drift velocity
                      from the mean displacement (MD) vs. time curves [3,4]. Using
                      Evanescent Wave Dynamic Light Scattering (EWDLS) we studied
                      the near-wall dynamics of spherical particles as a function
                      of concentration, providing experimental prove for the long
                      standing theoretical prediction that particle dynamics near
                      walls are slowed down and are anisotropic [5]. Upon
                      increasing particle concentration the slowing down is
                      diminished, where the diminishment is again different in the
                      directions parallel and normal to the interface
                      [6].References[1] C. July, D. Kleshchanok, P. R. Lang Eur.
                      Phys. J. E 35, 60 (2012). DOI 10.1140 epje/i2012-12060-7[2]
                      S. De Sio and P. R. Lang, Z. Phys. Chem. 229, 1161
                      (2015).[3] S. Desio, PhD-Thesis Heinrich-Heine-Universitaet
                      Duesseldorf, Germany[4] S. De Sio, Y. Liu, J.K.G. Dhont and
                      P. R. Lang manuscript in preparation[5] P. Holmqvist, J. K.
                      G. Dhont, P. R. Lang J. Chem. Phys. 126, 044707 (2007).[6]
                      Y. Liu et al. Soft Matter 11, 7316 (2015).},
      month         = {Jun},
      date          = {2018-06-18},
      organization  = {30th International Conference on
                       Science and Technology of Complex
                       Fluids, San Luis Potosí (Mexico), 18
                       Jun 2018 - 22 Jun 2018},
      subtyp        = {Invited},
      cin          = {ICS-3},
      cid          = {I:(DE-Juel1)ICS-3-20110106},
      pnm          = {551 - Functional Macromolecules and Complexes (POF3-551) /
                      ESMI - European Soft Matter Infrastructure (262348) /
                      SOMATAI - Soft Matter at Aqueous Interfaces (316866) / EUSMI
                      - European infrastructure for spectroscopy, scattering and
                      imaging of soft matteer (731019)},
      pid          = {G:(DE-HGF)POF3-551 / G:(EU-Grant)262348 /
                      G:(EU-Grant)316866 / G:(EU-Grant)731019},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/849730},
}