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Direct measurement of thermophoretic forces
Laurent Helden, Ralf Eichhorn, Clemens Bechinger
We study the thermophoretic motion of a micron sized single colloidal particle in front of a flat wall by evanescent light scattering. To quantify thermophoretic effects we analyse…
Probing linear and nonlinear microrheology of viscoelastic fluids
Juan Ruben Gomez-Solano, Clemens Bechinger
Bulk rheological properties of viscoelastic fluids have been extensively studied in macroscopic shearing geometries. However, little is known when an active microscopic probe is us…
Can the self-propulsion of anisotropic microswimmers be described by using forces and torques?
Borge ten Hagen, Raphael Wittkowski, Daisuke Takagi +3
The self-propulsion of artificial and biological microswimmers (i.e., active colloidal particles) has often been modelled by using a force and a torque entering into the overdamped…
Gravitaxis of asymmetric self-propelled colloidal particles
Borge ten Hagen, Felix Kümmel, Raphael Wittkowski +3
Many motile microorganisms adjust their swimming motion relative to the gravitational field and thus counteract sedimentation to the ground. This gravitactic behavior is often the…
Reply to Comment on "Circular Motion of Asymmetric Self-Propelling Particles"
Felix Kümmel, Borge ten Hagen, Raphael Wittkowski +6
In a Comment [Phys. Rev. Lett. 113, 029801 (2014)] on our Letter on self-propelled asymmetric particles [Phys. Rev. Lett. 110, 198302 (2013); arXiv:1302.5787], Felderhof claims tha…