Active responsive colloids driven by intrinsic dichotomous noise

Abstract

We study the influence of intrinsic noise on the structure and dynamics of responsive colloids (RCs) which actively change their size and mutual interactions. The colloidal size is explicitly resolved in our RC model as an internal degree of freedom (DOF) in addition to the particle translation. A Hertzian pair potential between the RCs leads to repulsion and shrinking of the particles, resulting in an explicit responsiveness of the system to self-crowding. To render the colloids active, their size is internally driven by a dichotomous noise, randomly switching ('breathing') between growing and shrinking states with a predefined rate, as motivated by recent experiments on synthetic active colloids. The polydispersity of this dichotomous active responsive colloid (D-ARC) model can be tuned by the parameters of the noise. Utilizing stochastic computer simulations, we study crowding effects on the spatial distributions, relaxation times, and self-diffusion of dense suspensions of the D-ARCs. We find a substantial influence of the 'built-in' intrinsic noise on the system's behavior, in particular, transitions from unimodal to bimodal size distributions for an increasing colloid density as well as intrinsic noise-modified diffusive translational dynamics. We conclude that controlling the noise of internal DOFs of a macromolecule or cell is a powerful tool for active colloidal materials to enable autonomous changes in the system's collective structure and dynamics towards the adaption of macroscopic properties to external perturbations.

arXiv comment13 pages with 6 figures

References in corpus (21)

• Active Particles in Complex and Crowded Environments
• Active Brownian Particles. From Individual to Collective Stochastic Dynamics
• Effective Interactions in Active Brownian Suspensions
• Elucidating the Origin of Heterogeneous Anomalous Diffusion in the Cytoplasm of Mammalian Cells
• Numerical modelling of non-ionic microgels: an overview
• Two-temperature Langevin dynamics in a parabolic potential
• Efficient swap algorithms for molecular dynamics simulations of equilibrium supercooled liquids
• Fast generation of ultrastable computer glasses by minimization of an augmented potential energy
• Swelling, Structure, and Phase Stability of Compressible Microgels
• The Parental Active Model: a unifying stochastic description of self-propulsion
• Catalysis by metallic nanoparticles in solution: Thermosensitive microgels as nanoreactors
• Discontinuous fluidisation transition in assemblies of actively-deforming particles: A new paradigm for collective motion in dense active materials
• Soft particles at liquid interfaces: From molecular particle architecture to collective phase behavior
• Intermittent Attractive Interactions Lead to Microphase Separation in Non-motile Active Matter
• Approach to equilibrium and non-equilibrium stationary distributions of interacting many-particle systems that are coupled to different heat baths
• Modeling of stimuli-responsive nanoreactors: rational rate control towards the design of colloidal enzymes
• Non-Gaussian noise without memory in active matter
• Active interaction switching controls the dynamic heterogeneity of soft colloidal dispersions
• Structure and dynamics of responsive colloids with dynamical polydispersity
• Structure and position-dependent properties of inhomogeneous suspensions of responsive colloids
• Effective temperatures for single particle system under dichotomous noise