402 citations · 2.9k across the 32 of their papers we have counts for
29 papers · 1 filter
Pseudo-giant number fluctuations and nematic order in microswimmer suspensions
Ismail El Korde, Dóra Bárdfalvy, Jason M. Lewis +3
Giant number fluctuations (GNFs), whereby the standard deviation in the local number of particles grows faster than , are a hallm…
Collective motion in a sheet of microswimmers
Dóra Bárdfalvy, Viktor Škultéty, Cesare Nardini +2
Self-propelled micron-size particles suspended in a fluid, like bacteria or synthetic microswimmers, are strongly non-equilibrium systems where particle motility breaks the microsc…
Pair-distribution function of active Brownian spheres in three spatial dimensions: simulation results and analytical representation
Stephan Bröker, Michael te Vrugt, Julian Jeggle +2
The pair-distribution function, which provides information about correlations in a system of interacting particles, is one of the key objects of theoretical soft matter physics. In…
Hydrodynamic instabilities in a 2-D sheet of microswimmers embedded in a 3-D fluid
Viktor Škultéty, Dóra Bárdfalvy, Joakim Stenhammar +2
A collection of microswimmers immersed in an incompressible fluid is characterised by strong interactions due to the long-range nature of the hydrodynamic fields generated by indiv…
Interplay between Brownian and hydrodynamic tracer diffusion in suspensions of swimming microorganisms
Henrik Nordanger, Alexander Morozov, Joakim Stenhammar
The general problem of tracer diffusion in non-equilibrium baths is important in a wide range of systems, from the cellular level to geographical lengthscales. In this paper, we re…
Thermal fluctuations and osmotic stability of lipid vesicles
Håkan Wennerström, Emma Sparr, Joakim Stenhammar
Biological membranes constantly change their shape in response to external stimuli, and understanding the remodeling and stability of vesicles in heterogeneous environments is ther…
Collective guiding of acoustically propelled nano- and microparticles for medical applications
Tobias Nitschke, Joakim Stenhammar, Raphael Wittkowski
One of the most important potential applications of self-propelled nano- and microdevices is targeted drug delivery. To realize this, biocompatible particles that can be guided col…
An Introduction to Motility-Induced Phase Separation
Joakim Stenhammar
Motility-induced phase separation, MIPS, is arguably the most well-studied collective phenomenon occurring in active matter without alignment interactions (scalar active matter). I…
ArGSLab: A tool for analyzing experimental or simulated particle networks
Jasper N. Immink, J. J. Erik Maris, Ronja F. Capellmann +3
Microscopy and particle-based simulations are both powerful techniques to study aggregated particulate matter such as colloidal gels. The data provided by these techniques often co…
Crystal-to-Crystal Transitions in Binary Mixtures of Soft Colloids
Jasper N. Immink, Maxime J. Bergman, J. J. Erik Maris +2
In this article, we demonstrate a method for inducing reversible crystal-to-crystal transitions in binary mixtures of soft colloidal particles. Through a controlled decrease of sal…
Anisotropic diffusion of ellipsoidal tracers in microswimmer suspensions
Henrik Nordanger, Alexander Morozov, Joakim Stenhammar
Tracer particles immersed in suspensions of biological microswimmers such as E. coli or C. reinhardtii display phenomena unseen in conventional equilibrium systems, including stron…
Derivation of the Derjaguin approximation for the case of inhomogeneous solvents
Håkan Wennerström, Joakim Stenhammar
The Derjaguin approximation (DA) relates the force between curved surfaces to the interaction free energy between parallel planes. It is typically derived by considering the direct…
Symmetric mixtures of pusher and puller microswimmers behave as noninteracting suspensions
Dóra Bárdfalvy, Shan Anjum, Cesare Nardini +2
Suspensions of rear- and front-actuated microswimmers immersed in a fluid, known respectively as ``pushers'' and ``pullers'', display qualitatively different collective behaviours:…
Anisotropic dynamics of a self-assembled colloidal chain in an active bath
Mehdi Shafiei Aporvari, Mustafa Utkur, Emine Ulku Saritas +2
Anisotropic macromolecules exposed to non-equilibrium (active) noise are very common in biological systems, and an accurate understanding of their anisotropic dynamics is therefore…
Swimming suppresses correlations in dilute suspensions of pusher microorganisms
Viktor Škultéty, Cesare Nardini, Joakim Stenhammar +2
Active matter exhibits various forms of non-equilibrium states in the absence of external forcing, including macroscopic steady-state currents. Such states are often too complex to…
Pair-distribution function of active Brownian spheres in two spatial dimensions: simulation results and analytic representation
Julian Jeggle, Joakim Stenhammar, Raphael Wittkowski
We investigate the full pair-distribution function of a homogeneous suspension of spherical active Brownian particles interacting by a Weeks-Chandler-Andersen potential in two spat…
Using patchy particles to prevent local rearrangements in models of non-equilibrium colloidal gels
Jasper N. Immink, J. J. Erik Maris, Peter Schurtenberger +1
Simple models based on isotropic interparticle attractions often fail to capture experimentally observed structures of colloidal gels formed through spinodal decomposition and subs…
Reversible Formation of Thermoresponsive Binary Particle Gels with Tunable Structural and Mechanical Properties
Jasper N. Immink, J. J. Erik Maris, Jérôme J. Crassous +2
We investigate the collective behavior of suspended thermoresponsive microgels, that expel solvent and subsequently decrease in size upon heating. Using a binary mixture of differe…
Particle-resolved lattice Boltzmann simulations of 3-dimensional active turbulence
Dora Bardfalvy, Henrik Nordanger, Cesare Nardini +2
Collective behaviour in suspensions of microswimmers is often dominated by the impact of long-ranged hydrodynamic interactions. These phenomena include active turbulence, where sus…
Directed Self-Assembly of Polarizable Ellipsoids in an External Electric Field
Arash Azari, Jérôme J. Crassous, Adriana M. Mihut +4
The interplay between shape anisotropy and directed long-range interactions enables the self-assembly of complex colloidal structures. As a recent highlight, ellipsoidal particles…
Nonequilibrium dynamics of mixtures of active and passive colloidal particles
Raphael Wittkowski, Joakim Stenhammar, Michael E. Cates
We develop a mesoscopic field theory for the collective nonequilibrium dynamics of multicomponent mixtures of interacting active (i.e., motile) and passive (i.e., nonmotile) colloi…
The role of correlations in the collective behaviour of microswimmer suspensions
Joakim Stenhammar, Cesare Nardini, Rupert W. Nash +2
In this Letter, we study the collective behaviour of a large number of self-propelled microswimmers immersed in a fluid. Using unprecedently large-scale lattice Boltzmann simulatio…
Stirring by Periodic Arrays of Microswimmers
Joost de Graaf, Joakim Stenhammar
The interaction between swimming microorganisms or artificial self-propelled colloids and passive (tracer) particles in a fluid leads to enhanced diffusion of the tracers. This enh…
Light-induced self-assembly of active rectification devices
J. Stenhammar, R. Wittkowski, D. Marenduzzo +1
Self-propelled colloidal objects, such as motile bacteria or synthetic microswimmers, have microscopically irreversible individual dynamics - a feature they share with all living s…