Publikation: Active and passive particle transport in dense colloidal suspensions
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Zusammenfassung
This thesis deals with nonlinear active transport of single colloidal particles in a colloidal suspension near the glass transition. We present a generalization of the mode-coupling theory of the glass transition to the case of a particle actively pulled by means of a time-and space constant external force. We predict such typical nonlinear effects like yielding (existence of a critical force needed to pull the particle free out of the cage of its nearest neighbors) and thinning (the decay of the friction coefficient with increasing external force). For the case of a hard sphere suspension, we succeeded to evaluate the value of the critical force, which is in semi-quantitative agreement with simulations and experiments. We present also simplified schematic versions of the microscopic equations of the theory, which retain some crucial properties of the whole equations, but are more easily treatable.
Zusammenfassung in einer weiteren Sprache
Die Doktorarbeit beschaeftigt sich mit dem aktiven Transport einzlelner kolloidaler Teilchen in dichten kolloidalen Suspensionen. Die Modenkopplungstheorie des Glasuebergangs wird verallgemeinert fuer den Fall von aktiv gezogenen Teilchen (die Kraft auf das Teilchen wird als raeumlich und zeitlich konstant angenommen). Die Theorie sagt solche typisch nichtlinearen Phaenomene voraus wie die Existenz einer kritischen Kraft, die benoetigt wird um das Teilchen aus dem Kaefig seiner naechsten Nachbarn herauszuziehen sowie das Abklingen des Reibungskoeffizienten mit der ansteigenden Kraft auf das Teilchen.
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GAZUZ, Igor, 2008. Active and passive particle transport in dense colloidal suspensions [Dissertation]. Konstanz: University of KonstanzBibTex
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