Self-diffusion in two-dimensional hard ellipsoid suspensions.

@article{Zheng2010SelfdiffusionIT,
  title={Self-diffusion in two-dimensional hard ellipsoid suspensions.},
  author={Zhongyu Zheng and Yilong Han},
  journal={The Journal of chemical physics},
  year={2010},
  volume={133 12},
  pages={
          124509
        }
}
We studied the self-diffusion of colloidal ellipsoids in a monolayer near a flat wall by video microscopy. The image processing algorithm can track the positions and orientations of ellipsoids with subpixel resolution. The translational and rotational diffusions were measured in both the laboratory frame and the body frame along the long and short axes. The long-time and short-time diffusion coefficients of translational and rotational motions were measured as functions of the particle… Expand
Two-dimensional Brownian motion of anisotropic dimers.
TLDR
The two-dimensional motion of colloidal dimers by single-particle tracking is studied and the experimental observations obtained by bright-field microscopy are compared to theoretical predictions for anisotropic diffusion to find a of the time-dependent diffusion coefficients parallel and perpendicular to the long axis of the dimer which decays over the orientational relaxation time. Expand
Dynamics of Directional Drift in Self-Diffusion of Molecules with Broken Symmetry
We show by molecular dynamics simulations and theoretical analyses that the self-diffusion of molecules/particles with broken symmetry in infinitely dilute solution includes a time-dependentExpand
Long-time dynamics and hydrodynamic correlations in quasi-two-dimensional anisotropic colloidal mixtures
The physical properties of multicomponent anisotropic colloidal dispersions are still far from being fully understood. This is mainly due to the fact that dealing with nonspherical particles andExpand
Anisotropic dynamics and kinetic arrest of dense colloidal ellipsoids in the presence of an external field studied by differential dynamic microscopy
TLDR
This work combines DDM with small-angle x-ray scattering and rheological measurements to locate the glass transition and to relate the collective short- and long-time diffusion coefficients to the structural correlations and the evolution of the zero shear viscosity as the system approaches an arrested state. Expand
Diffusion of nano-rods
Diffusion behaviors in nano-rods suspension in the fluid are investigated by Stochastic Eulerian Lagrangian Methods, where the degrees of freedom for coarse-grained microstructure are coupled withExpand
Non-Gaussian, transiently anomalous and ergodic self-diffusion of flexible dumbbells in crowded two-dimensional environments: coupled translational and rotational motions
TLDR
L Langevin-dynamics simulations are employed to unveil non-Brownian and non-Gaussian center-of-mass self-diffusion of massive flexible dumbbell-shaped particles in crowded two-dimensional solutions and attribute these regimes to a crowding-induced transition from a viscous to a viscoelastic diffusion medium upon growing ϕ. Expand
Constrained Brownian Motion of a Single Ellipsoid in a Narrow Channel
We study the Brownian motion of a single ellipsoidal particle diffusing in a narrow channel by video-microscopy measurement. The experiments allow us to obtain the trajectories of ellipsoids andExpand
Structural signatures of dynamic heterogeneities in monolayers of colloidal ellipsoids
TLDR
These findings demonstrate that the particle shape anisotropy has important effects on the structure and dynamics of the glass, particularly in monolayers of colloidal ellipsoids with different aspect ratios. Expand
Diffusion of Anisotropic Colloids in Periodic Arrays of Obstacles.
TLDR
A new experimental model, consisting of colloidal ellipsoids in periodic array of obstacles, is proposed to investigate the confined diffusion of anisotropic colloids and suggests that the shape anisotropy and spatial confinements play a vital role in the diffusion dynamics. Expand
Self-Propulsion and Active Motion of Janus Ellipsoids.
TLDR
The physical origins of the observed categories of motion are considered and the forces and torques generated by the catalytically generated propulsion as a function of aspect ratio are extracted. Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 51 REFERENCES
Quasi-two-dimensional diffusion of single ellipsoids: aspect ratio and confinement effects.
TLDR
Video-microscopy measurements of the translational and rotational Brownian motions of isolated ellipsoidal particles in quasi-two-dimensional sample cells of increasing thickness found wall confinement was found to substantially alter diffusion anisotropy and substantially slow particle diffusion along the short axis compared to 3D. Expand
Experimental observations of non-Gaussian behavior and stringlike cooperative dynamics in concentrated quasi-two-dimensional colloidal liquids.
  • A. Marcus, J. Schofield, S. Rice
  • Physics, Medicine
  • Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
  • 1999
TLDR
These results are the first experimental verification of the existence of microscopic cooperativity and the predicted temporal evolution of the diffusion coefficient for Brownian motion in concentrated quasi-two-dimensional liquids. Expand
Long-Time Self-Diffusion of Rigid Rods at Low Concentrations: A Variational Approach
No theoretical predictions exist for the concentration dependence of long-time self-diffusion coefficients of rod-shaped Brownian particles with a finite aspect ratio. The reason for this is that theExpand
Diffusion of hard disks and rodlike molecules on surfaces.
TLDR
This work focuses on the behavior of the various diffusion coefficients as a function of the two-dimensional number density rho in the case where there are no explicit surface-particle interactions, and finds behavior very similar to the case of disks with the same repulsive interaction. Expand
Long-time translational self-diffusion in isotropic and nematic dispersions of colloidal rods
Long-time self-diffusion in dispersions of rigid colloidal rods with an aspect ratio of 19 is studied with fluorescence recovery after photobleaching (FRAP)in isotropic and nematic phases. TheExpand
Dynamics of concentrated hard-sphere colloids near a wall.
TLDR
A new analysis for the EWDLS short-time self- and collective diffusivities applicable to all volume fractions and a simple model for the self-diffusion describing the interplay between particle-wall and particle-particle HI is presented. Expand
Self-diffusion of rodlike and spherical particles in a matrix of charged colloidal spheres: a comparison between fluorescence recovery after photobleaching and fluorescence correlation spectroscopy.
TLDR
A comparison of the results that were obtained by FCS and FRAP, in combination with Brownian Dynamics simulations, gives insight into the time dependence of the self-diffusion coefficient of an interacting colloidal system. Expand
Rotational and Translational Diffusion of a Rodlike Virus in Random Coil Polymer Solutions
Depolarized dynamic light scattering was used to measure the translational and rotational diffusion of tobacco mosaic virus, TMV, in aqueous solutions of dextran (M ∼505 000). TMV is an electricallyExpand
Self-diffusion of a semiflexible polymer measured across the lyotropic liquid-crystalline-phase boundary
The self-diffusion of fluorescently tagged poly(γ-benzyl-α,L-glutamate), a helical, semiflexible synthetic homopolypeptide, has been measured in isotropic and cholesteric liquid-crystalline solutionsExpand
Phase behavior of two-dimensional hard rod fluids
Monte Carlo simulations are used to study two-dimensional hard rod fluids consisting of spherocylinders confined to lie in a plane. The phase behavior is mapped out as a function of the aspect ratioExpand
...
1
2
3
4
5
...