High bandwidth microrheology of complex fluids and biopolymer networks
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The aim of this thesis is to study the microrheology of complex fluids at high frequencies (up to 100kHz) with high spatial resolution (subnanometer). We address different technical developments in building a high frequency one- and two-particle microrheology method based on laser tracking and optical interferometric. Then we apply these methods to study the frequency-dependent viscoelastic properties of solutions of wormlike micelles and cytoskeleton actin networks. Using the same methods we are able to map the flow patterns at high frequencies and resolve the inertial induced vortex propagation in simple and viscoelastic fluids.