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Effective Cahn-Hilliard equation for the phase separation of active Brownian particles
Thomas Speck, Julian Bialké, Andreas M. Menzel +1
The kinetic separation of repulsive active Brownian particles into a dense and a dilute phase is analyzed using a systematic coarse-graining strategy. We derive an effective Cahn-H…
The effect of boundary adaptivity on hexagonal ordering and bistability in circularly confined quasi hard discs
Ian Williams, Erdal C. Oğuz, Robert L. Jack +3
The behaviour of materials under spatial confinement is sensitively dependent on the nature of the confining boundaries. In two dimensions, confinement within a hard circular bound…
Two-dimensional colloidal mixtures in magnetic and gravitational fields
Hartmut Löwen, Tobias Horn, Tim Neuhaus +1
This mini-review is concerned with two-dimensional colloidal mixtures exposed to various kinds of external fields. By a magnetic field perpendicular to the plane, dipole moments ar…
Introduction to colloidal dispersions in external fields
Hartmut Löwen
Progress in the research area of colloidal dispersions in external fields within the last years is reviewed. Colloidal dispersions play a pivotal role as model systems for phase tr…
Differently Shaped Hard Body Colloids in Confinement: From passive to active particles
Henricus H. Wensink, Hartmut Löwen, Matthieu Marechal +5
We review recent progress in the theoretical description of anisotropic hard colloidal particles. The shapes considered range from rods and dumbbells to rounded cubes, polyhedra an…
Coupling between bulk- and surface chemistry in suspensions of charged colloids
Marco Heinen, Thomas Palberg, Hartmut Löwen
The ionic composition and pair correlations in fluid phases of realistically salt-free charged colloidal sphere suspensions are calculated in the primitive model. We obtain the num…
Confined colloidal crystals in and out of equilibrium
A. Reinmüller, E. C. Oğuz, R. Messina +3
Recent studies on confined crystals of charged colloidal particles are reviewed, both in equilibrium and out of equilibrium. We focus in particular on direct comparisons of experim…
Non-Gaussian statistics for the motion of self-propelled Janus particles: experiment versus theory
Xu Zheng, Borge ten Hagen, Andreas Kaiser +4
Spherical Janus particles are one of the most prominent examples for active Brownian objects. Here, we study the diffusiophoretic motion of such microswimmers in experiment and in…
Dynamics of a deformable active particle under shear flow
Mitsusuke Tarama, Andreas M. Menzel, Borge ten Hagen +3
The motion of a deformable active particle in linear shear flow is explored theoretically. Based on symmetry considerations, in two spatial dimensions, we propose coupled nonlinear…
Capturing self-propelled particles in a moving microwedge
A. Kaiser, K. Popowa, H. H. Wensink +1
Catching fish with a fishing net is typically done either by dragging a fishing net through quiescent water or by placing a stationary basket trap into a stream. We transfer these…
Scaling of cluster growth for coagulating active particles
P. Cremer, H. Löwen
Cluster growth in a coagulating system of active particles (such as microswimmers in a solvent) is studied by theory and simulation. In contrast to passive systems, the net velocit…
Microscopic theory for the phase separation of self-propelled repulsive disks
Julian Bialké, Hartmut Löwen, Thomas Speck
Motivated by recent experiments on colloidal suspensions, we study analytically and numerically a microscopic model for self-propelled particles lacking alignment interactions. In…
Highly asymmetric electrolytes in the primitive model: Hypernetted chain solution in arbitrary spatial dimensions
Marco Heinen, Elshad Allahyarov, Hartmut Löwen
The pair-correlation functions for fluid ionic mixtures in arbitrary spatial dimensions are computed in hypernetted chain (HNC) approximation. In the primitive model, all ions are…
Compatibility waves drive crystal growth on patterned substrates
Tim Neuhaus, Michael Schmiedeberg, Hartmut Löwen
We explore the crystallization in a colloidal monolayer on a structured template starting from a few-particle nucleus. The competition between the substrate structure and that of t…
Hardening transition in a one-dimensional model for ferrogels
M. A. Annunziata, A. M. Menzel, H. Löwen
We introduce and investigate a coarse-grained model for quasi one-dimensional ferrogels. In our description the magnetic particles are represented by hard spheres with a magnetic d…
Dynamical clustering and phase separation in suspensions of self-propelled colloidal particles
Ivo Buttinoni, Julian Bialké, Felix Kümmel +3
We study experimentally and numerically a (quasi) two dimensional colloidal suspension of self-propelled spherical particles. The particles are carbon-coated Janus particles, which…
Two-dimensional melting under quenched disorder
Sven Deutschländer, Tobias Kruppa, Hartmut Löwen +2
We study the influence of quenched disorder on the two-dimensional melting behavior by using both video-microscopy of superparamagnetic colloidal particles and computer simulations…
Brownian motion and the hydrodynamic friction tensor for colloidal particles of complex shape
Daniela J. Kraft, Raphael Wittkowski, Borge ten Hagen +3
We synthesize colloidal particles with various anisotropic shapes and track their orientationally resolved Brownian trajectories using confocal microscopy. An analysis of appropria…
Rhombic preordering on a square substrate
T. Neuhaus, M. Marechal, M. Schmiedeberg +1
A competition of incommensurate symmetries occurs whenever a system is forced to conform to an ordering that is different from the intrinsically preferred structure of the system i…
Vacancy diffusion in colloidal crystals as determined by dynamical density-functional theory and the phase-field-crystal model
Sven van Teeffelen, Cristian Vasile Achim, Hartmut Löwen
A two-dimensional crystal of repulsive dipolar particles is studied in the vicinity of its melting transition by using Brownian dynamics computer simulation, dynamical density func…
Circular motion of asymmetric self-propelling particles
Felix Kümmel, Borge ten Hagen, Raphael Wittkowski +5
Micron-sized self-propelled (active) particles can be considered as model systems for characterizing more complex biological organisms like swimming bacteria or motile cells. We pr…
Structure and dynamics of interfaces between two coexisting liquid crystalline phases
Simon Praetorius, Axel Voigt, Raphael Wittkowski +1
The phase-field-crystal model is used to access the structure and thermodynamics of interfaces between two coexisting liquid crystalline phases in two spatial dimensions. Depending…