Single-Particle and Collective Slow Dynamics of Colloids in Porous Confinement

Kurzidim, Jan; Coslovich, Daniele; Kahl, Gerhard

doi:10.1103/physrevlett.103.138303

Cited by 73 publications

(113 citation statements)

References 23 publications

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“…46 and 51) but the total concentration (uid + obstacles) in these studies did not exceed 0.6. 49 Properties generated by the DLL model reected suitable dynamic behavior in several problems like simple liquid dynamics, 55 polymer-polymer interdiffusion, 56 reaction diffusion front problems, 61 polymer solution dynamics 62 and dynamics of the ATRP. [63][64][65][66][67][68] As depicted in Fig.…”

Section: The Dll Model and Simulation Conditionsmentioning

confidence: 99%

Simulation of diffusion in a crowded environment

Polanowski

Sikorski

2014

Soft Matter

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We performed extensive and systematic simulation studies of two-dimensional fluid motion in a complex crowded environment. In contrast to other studies we focused on cooperative phenomena that occurred if the motion of particles takes place in a dense crowded system, which can be considered as a crude model of a cellular membrane. Our main goal was to answer the following question: how do the fluid molecules move in an environment with a complex structure, taking into account the fact that motions of fluid molecules are highly correlated. The dynamic lattice liquid (DLL) model, which can work at the highest fluid density, was employed. Within the frame of the DLL model we considered cooperative motion of fluid particles in an environment that contained static obstacles. The dynamic properties of the system as a function of the concentration of obstacles were studied. The subdiffusive motion of particles was found in the crowded system. The influence of hydrodynamics on the motion was investigated via analysis of the displacement in closed cooperative loops. The simulation and the analysis emphasize the influence of the movement correlation between moving particles and obstacles.

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Section: The Dll Model and Simulation Conditionsmentioning

confidence: 99%

Simulation of diffusion in a crowded environment

Polanowski

Sikorski

2014

Soft Matter

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“…A series of non-trivial predictions have been made by a generalization of the mode-coupling theory accounting for the interaction with frozen obstacles [9][10][11]. The phase diagram for mixtures of mobile and frozen components has been explored by computer simulations and semi-quantitative agreement with mode-coupling theory has been reported [12][13][14]. If the density of the mobile component becomes very small, the interaction among the mobile particles can be ignored and the dynamics is governed solely by the excluded volume due to the frozen matrix.…”

Section: Introductionmentioning

confidence: 99%

Anomalous transport of a tracer on percolating clusters

Spanner¹,

Höfling²,

Schröder‐Turk³

et al. 2011

J. Phys.: Condens. Matter

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Abstract. We investigate the dynamics of a single tracer exploring a course of fixed obstacles in the vicinity of the percolation transition for particles confined to the infinite cluster. The mean-square displacement displays anomalous transport, which extends to infinite times precisely at the critical obstacle density. The slowing down of the diffusion coefficient exhibits power-law behavior for densities close to the critical point and we show that the mean-square displacement fulfills a scaling hypothesis. Furthermore, we calculate the dynamic conductivity as response to an alternating electric field. Last, we discuss the non-gaussian parameter as an indicator for heterogeneous dynamics.

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“…Taking for example binary mixtures with sufficiently disparate constituents, a glass can form where some (slow) species freeze, but a fast component is able to diffuse through the voids left in the amorphous packing. This scenario is particularly relevant for transport through heterogeneous disordered media [3][4][5][6][7] or glassy ion conductors [8,9]. The simplest model are binary hard-sphere mixtures with large size disparity, where experiments on colloidal suspensions indeed found, depending on relative concentration, a partially frozen "single glass" with mobile small particles, separate from a "double glass" where both particle species freeze [10,11].…”

Section: Pacs Numbers: Pacs Tbdmentioning

confidence: 99%

Multiple glasses in asymmetric binary hard spheres

Voigtmann

2011

EPL

127

112

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Multiple distinct glass states occur in binary hard-sphere mixtures with constituents of very disparate sizes according to the mode-coupling theory of the glass transition (MCT), distinguished by considering whether small particles remain mobile or not, and whether small particles contribute significantly to perturb the big-particle structure or not. In the idealized glass, the four different glasses are separated by sharp transitions that give rise to higher-order transition phenomena involving logarithmic decay laws, and to anomalous power-law-like diffusion. The phenomena are argued to be expected generally in glass-forming mixtures. PACS numbers: pacs tbdMany glass formers and virtually all simple model systems for slow dynamics are mixtures of some sort. Close to a glass transition generic mixing effects appear, such as dramatic changes in viscosity induced by small composition changes [1,2], that are relevant for applications and may help to shed light on the microscopic processes driving glass formation.Even more interesting is the possibility to form qualitatively distinct types of glass, depending on mixture composition and constituents. Taking for example binary mixtures with sufficiently disparate constituents, a glass can form where some (slow) species freeze, but a fast component is able to diffuse through the voids left in the amorphous packing. This scenario is particularly relevant for transport through heterogeneous disordered media [3][4][5][6][7] or glassy ion conductors [8,9]. The simplest model are binary hard-sphere mixtures with large size disparity, where experiments on colloidal suspensions indeed found, depending on relative concentration, a partially frozen "single glass" with mobile small particles, separate from a "double glass" where both particle species freeze [10,11]. In mixtures of star polymers [12][13][14] yet another kind of glass emerged, termed "asymmetric" because it is characterized by few big particles frozen in a small-particle matrix, rendering the big-particle nearestneighbor cages highly nonspherical. It was, however, argued to be a hallmark of the ultra-soft interactions typical for the star polymers.Another kind of glass intuitively argued for is the "attractive glass" famous from colloid-polymer mixtures where free polymer induces depletion attraction among the colloids. If that attraction is weak, the glass that forms is essentially hard-sphere like or "repulsive", while at sufficiently strong and short-ranged attraction, a new glass driven by bonding and not nearest-neighbor cageing appears. Based on extensively tested predictions of the mode-coupling theory of the glass transition (MCT) for a square-well model system [15][16][17][18][19][20], one expects the two glasses to be separated by a glass-glass transition crossing which, for example, the elastic moduli of the glass exhibit sharp changes. Considering the generality of the depletion-interaction mechanism [21], one may indeed expect a similar glass-glass transition to be present in binary mixtures quite ge...

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Single-Particle and Collective Slow Dynamics of Colloids in Porous Confinement

Cited by 73 publications

References 23 publications

Simulation of diffusion in a crowded environment

Simulation of diffusion in a crowded environment

Anomalous transport of a tracer on percolating clusters

Multiple glasses in asymmetric binary hard spheres

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