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11 papers · 2 filters
Fission and fusion scenarios for magnetic microswimmer clusters
Francisca Guzmán-Lastra, Andreas Kaiser, Hartmut Löwen
Fission and fusion processes of particles clusters occur in many areas of physics and chemistry from subnuclear to astronomic length scales. Here we study fission and fusion of mag…
Dynamic mode locking in a driven colloidal system: experiments and theory
Michael P. N. Juniper, Urs Zimmermann, Arthur V. Straube +4
In this article we examine the dynamics of a colloidal particle driven by a modulated force over a sinusoidal optical potential energy landscape. Coupling between the competing fre…
Controlled assembly of single colloidal crystals using electro-osmotic micro-pumps
Ran Niu, Erdal C. Oğuz, Hannah Müller +4
We assemble charged colloidal spheres at deliberately chosen locations on a charged unstructured glass substrate utilizing ion exchange based electro-osmotic micro-pumps. Using mic…
Phototaxis of synthetic microswimmers in optical landscapes
Celia Lozano, Borge ten Hagen, Hartmut Löwen +1
Many microorganisms, with phytoplankton and zooplankton as prominent examples, display phototactic behaviour, that is, the ability to perform directed motion within a light gradien…
Hard rectangles near curved hard walls: tuning the sign of the Tolman length
Christoph E. Sitta, Frank Smallenburg, Raphael Wittkowski +1
Combining analytic calculations, computer simulations, and classical density functional theory we determine the interfacial tension of orientable two-dimensional hard rectangles ne…
Brownian motion of a circle swimmer in a harmonic trap
Soudeh Jahanshahi, Hartmut Löwen, Borge ten Hagen
We study the dynamics of a Brownian circle swimmer with a time-dependent self-propulsion velocity in an external temporally varying harmonic potential. For several situations, the…
Superelastic stress-strain behavior in ferrogels of different types of magneto-elastic coupling
Peet Cremer, Hartmut Löwen, Andreas M. Menzel
Colloidal magnetic particles embedded in an elastic polymer matrix constitute a smart material called ferrogel. It responds to an applied external magnetic field by changes in elas…
Dynamic Elastic Moduli in Magnetic Gels: Normal Modes and Linear Response
Giorgio Pessot, Hartmut Löwen, Andreas M. Menzel
In the perspective of developing smart hybrid materials with customized features, ferrogels and magnetorheological elastomers allow a synergy of elasticity and magnetism. The inter…
Following fluctuating signs: anomalous active superdiffusion of swimmers in anisotropic media
John Toner, Hartmut Löwen, Henricus H. Wensink
Active (i.e., self-propelled or swimming) particles moving through an isotropic fluid exhibit conventional diffusive behavior. We report anomalous diffusion of an active particle m…
Colloidal suspensions of C-particles: Entanglement, percolation and microrheology
Christian Hoell, Hartmut Löwen
We explore structural and dynamical behavior of concentrated colloidal suspensions made up by C-shape particles using Brownian dynamics computer simulations and theory. In particul…
Active Particles in Complex and Crowded Environments
Clemens Bechinger, Roberto Di Leonardo, Hartmut Löwen +3
Differently from passive Brownian particles, active particles, also known as self-propelled Brownian particles or microswimmers and nanoswimmers, are capable of taking up energy fr…