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Adding a non-adsorbing polymer to passive colloids induces an attraction between the particles via the `depletion' mechanism. High enough polymer concentrations lead to phase separation. We combine experiments, theory and simulations to…

软凝聚态物质 · 物理学 2016-07-13 J. Schwarz-Linek , C. Valeriani , A. Cacciuto , M. E. Cates , D. Marenduzzo , A. N. Morozov , W. C. K. Poon

Motility-induced phase separation (MIPS) leads to cohesive active matter in the absence of cohesive forces. We present, extend and illustrate a recent generalized thermodynamic formalism which accounts for its binodal curve. Using this…

We computationally study suspensions of slow and fast active Brownian particles that have undergone motility induced phase separation and are at steady state. Such mixtures, of varying non-zero activity, remain largely unexplored even…

软凝聚态物质 · 物理学 2024-07-11 Nicholas J Lauersdorf , Ehssan Nazockdast , Daphne Klotsa

Proliferation and motility are ubiquitous drivers of activity in biological systems. Here, we study a dense binary mixture of motile and proliferating particles with exclusively repulsive interactions, where homeostasis in the proliferating…

软凝聚态物质 · 物理学 2025-06-11 Lukas Hupe , Joanna M. Materska , David Zwicker , Ramin Golestanian , Bartlomiej Waclaw , Philip Bittihn

We consider stochastic dynamics of self-propelled particles with nonlocal normalized alignment interactions subject to phase lag. The role of the lag is to indirectly generate chirality into particle motion. To understand large scale…

适应与自组织系统 · 物理学 2020-08-12 Nikita Kruk , José A. Carrillo , Heinz Koeppl

Repulsive self-propelled particles tend to cluster, leading to Motility-Induced Phase Separation (MIPS). By analogy with equilibrium phase separation, the onset of MIPS has been associated with a transition to effective attraction between…

Active matter exhibits many intriguing non-equilibrium character, \emph{e.g.}, the active Brownian particles (ABP) without any attractive and aligned interactions can occur the mobility-induced phase transition to form some dense domains…

软凝聚态物质 · 物理学 2023-05-24 Cheng Yang , Ying Zeng , Shun Xu , Xin Zhou

Using Brownian dynamics (BD) simulations we investigate the self-organization of a monolayer of chiral active particles with dipolar interactions. Each particle is driven by both, translational and rotational self-propulsion, and carries a…

软凝聚态物质 · 物理学 2021-07-13 Guo-Jun Liao , Sabine H. L. Klapp

The clustering of self-motile and repulsive particles, so-called motility-induced phase separation (MIPS), is one of the clearest signatures of active physics. Typically, increasing the amplitude of self-motility increases the degree of…

软凝聚态物质 · 物理学 2026-02-12 Letian Chen , Luke K. Davis

A collection of self-propelled particles with volume exclusion interactions can exhibit the phenomenology of gas-liquid phase separation, known as motility-induced phase separation (MIPS). The non-equilibrium nature of the system is…

软凝聚态物质 · 物理学 2019-08-14 Benjamin Partridge , Chiu Fan Lee

Dynamical clustering represents a characteristic feature of active matter consisting of self-propelled agents that convert energy from the environment into mechanical motion. At the micron scale, typical of overdamped dynamics, particles…

软凝聚态物质 · 物理学 2024-06-04 Lorenzo Caprini , Davide Breoni , Anton Ldov , Christian Scholz , Hartmut Löwen

Motility induced phase separation is an efficient aggregation mechanism of active matter, yet biological systems exhibit richer organization through communication among constituents. We investigate suspensions of active particles that…

软凝聚态物质 · 物理学 2025-08-18 Yuxin Zhou , Qingqing Yin , Shubhadip Nayak , Poulami Bag , Pulak K. Ghosh , Yunyun Li , Fabio Marchesoni

To study the role of torque in motility-induced phase separation (MIPS), we simulate a system of self-propelled particles whose shape varies smoothly from isotropic (disks/spheres) to weakly elongated (rods). We construct the phase diagrams…

统计力学 · 物理学 2019-05-10 Robin van Damme , Jeroen Rodenburg , René van Roij , Marjolein Dijkstra

We present the Brownian dynamics simulation of active colloidal suspension in two dimensions, where the self-propulsion speed of a colloid is regulated according to the local density sensed by it. The role of concentration-dependent…

软凝聚态物质 · 物理学 2021-01-29 Francis Jose , Shalabh K. Anand , Sunil P. Singh

Active Brownian particles display self-propelled movement, which can be modelled as arising from a one-body force. Although their interparticle interactions are purely repulsive, for strong self propulsion the swimmers phase separate into…

软凝聚态物质 · 物理学 2021-03-25 Sophie Hermann , Daniel de las Heras , Matthias Schmidt

Motility-induced phase separation (MIPS) is a nonequilibrium phase separation that has a different origin from equilibrium phase separation induced by attractive interactions. Similarities and differences in collective behaviors between…

统计力学 · 物理学 2024-01-23 Hiroyoshi Nakano , Kyosuke Adachi

Systems comprised of self-steering active Brownian particles are studied via simulations for a minimal cognitive flocking model. The dynamics of the active Brownian particles is extended by an orientational response with limited…

软凝聚态物质 · 物理学 2024-06-04 Rajendra Singh Negi , Roland G. Winkler , Gerhard Gompper

Chiral active matter is enjoying a rapid increase of interest, spurred by the rich variety of asymmetries that can be attained in e.g. the shape or self-propulsion mechanism of active particles. Though this has already led to the observance…

软凝聚态物质 · 物理学 2023-02-15 Vincent E. Debets , Hartmut Löwen , Liesbeth M. C. Janssen

In this paper we provide high precision estimates of the phase diagram of active Brownian particles. We extract coexisting densities from simulations of phase separated states in an elongated box (slab geometry) which minimizes finite-size…

软凝聚态物质 · 物理学 2017-08-16 Jonathan Tammo Siebert , Janina Letz , Thomas Speck , Peter Virnau

Chiral active matter is a variant of active matter systems in which the motion of the constituent particles violates mirror symmetry. In this letter, we simulate two-dimensional chiral Active Brownian Particles, the simplest chiral model in…

软凝聚态物质 · 物理学 2025-12-03 Kangeun Jeong , Yuta Kuroda , Yuki Asatani , Takeshi Kawasaki , Kunimasa Miyazaki