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000017831 1001_ $$0P:(DE-Juel1)VDB88917$$aJuly, Christoph$$b0$$eCorresponding author$$gmale$$uFZJ
000017831 245__ $$aInfluence of a shear flow on colloidal depletion interaction
000017831 260__ $$aJülich$$aForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2011
000017831 300__ $$aV, 105, XVIII S.
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000017831 4900_ $$0PERI:(DE-600)2445293-2$$aSchriften des Forschungszentrums Jülich. Schlüsseltechnologien / Key Technologies$$v41
000017831 502__ $$aHeinrich-Heine-Universität Düsseldorf, Diss., 2011$$bDr. (Univ.)$$cHeinrich-Heine-Universität Düsseldorf$$d2011
000017831 500__ $$3POF3_Assignment on 2016-02-29
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000017831 520__ $$aIn 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. [...]
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000017831 9132_ $$0G:(DE-HGF)POF3-559H$$1G:(DE-HGF)POF3-550$$2G:(DE-HGF)POF3-500$$aDE-HGF$$bKey Technologies$$lBioSoft – Fundamentals for future Technologies in the fields of Soft Matter and Life Sciences$$vAddenda$$x0
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