Self-Diffusion of a Rodlike Virus in the Isotropic Phase

Cush, Randall C.; Russo, Paul S.

doi:10.1021/ma0205459

Cited by 19 publications

(22 citation statements)

References 40 publications

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“…In particular, most of the studies in this direction were devoted to analyze the anisotropy of the diffusion by the measurement of the self-diffusion coefficients in different mesophases [25][26][27][28]. For lyotropic LCs these results found good overall agreement with experiments based on techniques such as fluorescence recovery after photobleaching (FRAP) [29][30][31][32]. On the other hand, only few studies focused on the analysis of the dynamical phenomena at the single-particle level, where fluorescence microscopy was applied to investigate the LC phases in colloidal suspensions of fd virus [33,34].…”

Section: Introductionmentioning

confidence: 74%

“…[25][26][27][28] For lyotropic LCs, these results found good overall agreement with experiments based on techniques such as fluorescence recovery after photobleaching. [29][30][31][32] On the other hand, only few studies focused on the analysis of the dynamical phenomena at the single-particle level, where fluorescence microscopy was applied to investigate the LC phases in colloidal suspensions of the fd virus. 33,34 This approach allowed to observe for the first time the mechanism of interlayer diffusion, or permeation, which characterizes the dynamics of the system in the smectic phase.…”

Section: Introductionmentioning

confidence: 99%

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Heterogeneous dynamics in columnar liquid crystals of parallel hard rods

Belli

Patti

Roij

et al. 2010

The Journal of Chemical Physics

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In the wake of previous studies on the rattling-and-jumping diffusion in smectic liquid crystal phases of colloidal rods, we analyze here for the first time the heterogeneous dynamics in columnar phases. More specifically, we perform computer simulations to investigate the relaxation dynamics of a binary mixture of perfectly aligned hard spherocylinders. We detect that the columnar arrangement of the system produces free-energy barriers that the particles should overcome to jump from one column to another, thus determining a hopping-type diffusion. This phenomenon accounts for the non-Gaussian intercolumn diffusion and shows a two-step structural relaxation that is remarkably analogous to that of out-of-equilibrium glass-forming systems and gels. Surprisingly enough, slight deviations from the behavior of simple liquids due to transient cages is also observed in the direction perpendicular to this plane, where the system is usually referred to as liquidlike.

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Section: Introductionmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Heterogeneous dynamics in columnar liquid crystals of parallel hard rods

Belli

Patti

Roij

et al. 2010

The Journal of Chemical Physics

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“…These theories have been verified on a qualitative level in ref. 26 experimentally and in ref. 27-29 by simulations.…”

Section: Introductionmentioning

confidence: 75%

Hydrodynamic interactions in rod suspensions with orientational ordering

et al. 2010

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The effect of hydrodynamic interactions on the diffusion of rods in the nematic phase is studied, both experimentally by time-resolved fluorescence video microscopy and theoretically by mesoscalehydrodynamics simulations. The aspect ratio of the rods and the relative importance of hydrodynamic interactions-compared to direct interactions-are varied independently. This is achieved in experiments by using charged rod-like viruses (fd-virus) with varying ionic strength, both for the wildtype virus and viruses coated with a brush of polymers. In computer simulations, hydrodynamic interactions are incorporated by a particle-based mesoscopic simulation technique. It is found that translational long-time diffusion coefficients for parallel motion along the nematic director, scaled with the diffusion coefficient at infinite dilution, are significantly affected by hydrodynamic interactions, but are insensitive to the aspect ratio. In contrast, the diffusion anisotropy-defined as the ratio of the diffusion coefficients parallel and perpendicular to the nematic director-shows only a weak dependence on hydrodynamic interactions, but strongly varies with the aspect ratio.

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“…27 Also noteworthy is the only qualitative agreement of experimental results with the corresponding theoretical predictions for the rod's translational diffusion coefficient in the screened hydrodynamic theories. [28][29][30] Overall, these results suggest that the validity and the fundamental basis of the tube model for rods is still open to question.…”

Section: Introductionmentioning

confidence: 96%

Screening of hydrodynamic interactions in Brownian rod suspensions

Pryamitsyn¹,

Ganesan²

2008

The Journal of Chemical Physics

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We present the details and results of a simulation study addressing the dynamics and rheology of rod suspensions over a wide regime of concentrations ranging from dilute to concentrated systems. Our study compares the results of two complementary simulation methods. The first method adapts a recently proposed explicit solvent simulation strategy and incorporates both hydrodynamical effects and steric interactions between the rod units. We compare the results of such a method with those obtained from a Brownian dynamics simulation approach which retains the steric interactions but neglects the effects of hydrodynamic interactions. Overall, our results in the context of the translational and rotational diffusivities are in agreement with the hydrodynamical predictions in the dilute regime and the corresponding results of the tube model and its extensions thereof in the semidilute regimes. The latter results suggest that effects of hydrodynamic interactions on the translational and rotational diffusivities are secondary relative to the steric interactions and at best lead only to a small correction to the results of the classical tube model. Our results in the context of linear viscoelasticity also broadly confirms the predictions of the tube model for the storage and loss moduli and allows us to extract for the first time the independent hydrodynamic and Brownian contributions to the zero shear viscosity. While the relative magnitudes of these contributions are consistent with the theoretical predictions, the quantitative magnitudes are quite different from the theoretical predictions. Overall, these results confirm the validity of the hydrodynamic "screening" hypothesis and ratify the neglect of hydrodynamical stresses in quantifying the linear rheology of Brownian rod suspensions.

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Self-Diffusion of a Rodlike Virus in the Isotropic Phase

Cited by 19 publications

References 40 publications

Heterogeneous dynamics in columnar liquid crystals of parallel hard rods

Heterogeneous dynamics in columnar liquid crystals of parallel hard rods

Hydrodynamic interactions in rod suspensions with orientational ordering

Screening of hydrodynamic interactions in Brownian rod suspensions

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