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Viscotaxis: microswimmer navigation in viscosity gradients
Benno Liebchen, Paul Monderkamp, Borge ten Hagen +1
The survival of many microorganisms, like \textit{Leptospira} or \textit{Spiroplasma} bacteria, can depend on their ability to navigate towards regions of favorable viscosity. Whil…
Tunable dynamic moduli of magnetic elastomers: from X-CT characterization to mesoscopic modeling
Giorgio Pessot, Malte Schümann, Thomas Gundermann +3
Ferrogels and magnetoelastomers are composite materials obtained by embedding magnetic particles of mesoscopic size in a crosslinked polymeric matrix. They combine the reversible e…
Liquid crystals of hard rectangles on flat and cylindrical manifolds
Christoph E. Sitta, Frank Smallenburg, Raphael Wittkowski +1
Using the classical density functional theory of freezing and Monte Carlo computer simulations, we explore the liquid-crystalline phase behavior of hard rectangles on flat and cyli…
Nematic liquid crystals on curved surfaces - a thin film limit
Ingo Nitschke, Michael Nestler, Simon Praetorius +2
We consider a thin film limit of a Landau-de Gennes Q-tensor model. In the limiting process we observe a continuous transition where the normal and tangential parts of the Q-tensor…
Triple junction at the triple point resolved on the individual particle level
M. Chaudhuri, E. Allahyarov, H. Löwen +2
At the triple point of a repulsive screened Coulomb system, a face-centered-cubic (fcc) crystal, a body-centered-cubic (bcc) crystal and a fluid phase coexist. At their intersectio…
Climbing two hills is faster than one: collective barrier-crossing by colloids driven through a microchannel
Urs Zimmermann, Hartmut Löwen, Christian Kreuter +3
Ohm's law is one of the most central transport rules stating that the total resistance of sequential single resistances is additive. While this rule is most commonly applied to ele…
Spontaneous membrane formation and self-encapsulation of active rods in an inhomogeneous motility field
Jens Grauer, Hartmut Löwen, Liesbeth M. C. Janssen
We study the collective dynamics of self-propelled rods in an inhomogeneous motility field. At the interface between two regions of constant but different motility, a smectic rod l…
Simulation Study of Ion Diffusion in Charged Nanopores with Anchored Terminal Groups
Elshad Allahyarov, Hartmut Löwen, Philip L. Taylor
We present coarse-grained simulation results for enhanced ion diffusion in a charged nanopore grafted with ionomer sidechains. The pore surface is hydrophobic and its diameter is v…
A density functional approach to ferrogels
P. Cremer, M. Heinen, A. M. Menzel +1
Ferrogels consist of magnetic colloidal particles embedded in an elastic polymer matrix. As a consequence, their structural and rheological properties are governed by a competition…
Helical paths, gravitaxis, and separation phenomena for mass-anisotropic self-propelling colloids: experiment versus theory
Andrew I. Campbell, Raphael Wittkowski, Borge ten Hagen +2
The self-propulsion mechanism of active colloidal particles often generates not only translational but also rotational motion. For particles with an anisotropic mass density under…