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@PHDTHESIS{July:17831,
      author       = {July, Christoph},
      title        = {{I}nfluence of a shear flow on colloidal depletion
                      interaction},
      volume       = {41},
      school       = {Heinrich-Heine-Universität Düsseldorf},
      type         = {Dr. (Univ.)},
      address      = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-17831},
      isbn         = {978-3-89336-791-7},
      series       = {Schriften des Forschungszentrums Jülich.
                      Schlüsseltechnologien / Key Technologies},
      pages        = {V, 105, XVIII S.},
      year         = {2011},
      note         = {Record converted from JUWEL: 18.07.2013;
                      Heinrich-Heine-Universität Düsseldorf, Diss., 2011},
      abstract     = {In this work colloidal depletion interactions are studied
                      in a quiescent state and under shear flow by means of total
                      internal reflection microscopy (TIRM). Depletion
                      interactions are very weak, entropy driven forces [1], which
                      arise when two or more colloidal particle species are mixed.
                      The first theoretical studies were done by Asakura and
                      Oosawa [2, 3]. The interest in depletion forces is driven by
                      the fact that they are able to influence phase behaviour and
                      self organisation of synthetic and natural colloidal systems
                      [4]. In general, depletion forces are so small that they are
                      difficult to measure by conventional methods such as atomic
                      force microscopy (AFM) [5, 6] or optical tweezers [7]. TIRM
                      is one of the most sensitive methods to probe depletion
                      interactions in colloidal systems [8–10]. This thesis
                      starts with an overview of the fundamental forces acting on
                      a colloid close to a wall (chapter 2). Electrostatic
                      interactions, gravitation, van der Waals forces, and a
                      simple depletion theory are derived for a colloidal sphere
                      in the vicinity of a surface. These theoretical foundations
                      are used as models to fit experimental potentials. Chapter 3
                      introduces the experimental methods used in this thesis and
                      provides an illustration of the nature of evanescent
                      illumination. The TIRM setup is explained in detail in
                      conjunction with the data evaluation. Sample preparation,
                      measurements of the properties of the used samples, as well
                      as advantages and drawbacks of the employed experimental
                      systems are further discussed in chapter 3. Methods for
                      characterizing samples and cleaning procedures are
                      discussed. In chapter 4, where the results of the thesis are
                      presented, first experiments suggest that using standard
                      TIRM methods result in artifacts when applying a shear flow
                      and trapping the probe particle with optical tweezers at the
                      same time. A significant advancement of this thesis is the
                      modification of the setup in order to remove the unwanted
                      influence of the tweezers when shearing the sample. [...]},
      cin          = {ICS-3},
      ddc          = {500},
      cid          = {I:(DE-Juel1)ICS-3-20110106},
      pnm          = {BioSoft: Makromolekulare Systeme und biologische
                      Informationsverarbeitung},
      pid          = {G:(DE-Juel1)FUEK505},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/17831},
}