Dynamic heterogeneities and non-Gaussian behavior in two-dimensional randomly confined colloidal fluids
arXiv:1608.04853 · doi:10.1103/PhysRevE.95.032602
Abstract
A binary mixture of super-paramagnetic colloidal particles is confined between glass plates such that the large particles become fixed and provide a two-dimensional disordered matrix for the still mobile small particles, which form a fluid. By varying fluid and matrix area fractions and tuning the interactions between the super-paramagnetic particles via an external magnetic field, different regions of the state diagram are explored. The mobile particles exhibit delocalized dynamics at small matrix area fractions and localised motion at high matrix area fractions, and the localization transition is rounded by the soft interactions [T. O. E. Skinner et al, Phys. Rev. Lett. {\bf 111}, 128301 (2013)]. Expanding on previous work, we find the dynamics of the tracers to be strongly heterogeneous and show that molecular dynamics simulations of an ideal gas confined in a fixed matrix exhibit similar behavior. The simulations show how these soft interactions make the dynamics more heterogenous compared to the disordered Lorentz gas and lead to strong non-Gaussian fluctuations.
References in corpus (22)
- Theoretical perspective on the glass transition and amorphous materials
- Anomalous transport in the crowded world of biological cells
- Dynamical heterogeneities in a supercooled Lennard-Jones liquid
- Supercooled Liquids for Pedestrians
- Heterogeneous Diffusion in Highly Supercooled Liquids
- Molecular Dynamics Simulations
- Localization Transition of the Three-Dimensional Lorentz Model and Continuum Percolation
- Liquid-glass transition of a fluid confined in a disordered porous matrix: A mode-coupling theory
- Observation of condensed phases of quasi-planar core-softened colloids
- Mode-coupling theory for the slow collective dynamics of fluids adsorbed in disordered porous media
- Single-particle and collective slow dynamics of colloids in porous confinement
- Crossover in the Slow Decay of Dynamic Correlations in the Lorentz Model
- Dynamic heterogeneity and non-Gaussian behavior in a model supercooled liquid
- The Localization Transition of the Two-Dimensional Lorentz Model
- Slow dynamics in random media: Crossover from glass to localization transition
- Critical dynamics of ballistic and Brownian particles in a heterogeneous environment
- Tagged-particle dynamics in a fluid adsorbed in a disordered porous solid: interplay between the diffusion-localization and liquid-glass transitions
- Localization dynamics of fluids in random confinement
- Rounding of the localization transition in model porous media
- Impact of random obstacles on the dynamics of a dense colloidal fluid
- Dynamic arrest of colloids in porous environments: disentangling crowding and confinement
- Anomalous transport of a tracer on percolating clusters
Cited by in corpus (8)
- Crowding of interacting fluid particles in porous media through molecular dynamics: breakdown of universality for soft interactions
- Fickian yet non-Gaussian diffusion in two-dimensional Yukawa liquids
- Anomalous transport in the soft-sphere Lorentz model
- Dynamics of fluids in quenched-random potential energy landscapes: a mode-coupling theory approach
- Brownian Yet Non-Gaussian Diffusion of a Light Particle in Heavy Gas: Lorentz Gas Based Analysis
- Dynamics of a noninteracting colloidal fluid in a quenched Gaussian random potential: A time-reversal-symmetry-preserving field-theoretic approach
- Rheological response of a glass-forming liquid having large bidispersity
- Non Gaussian information of heterogeneity in Soft Matter