Hydrodynamic interactions in rod suspensions with orientational ordering

Lettinga, M. P.; Dhont, Jan K. G.; Zhang, Zhenkun; Meßlinger, Sebastian; Gompper, Gerhard

doi:10.1039/c0sm00081g

Cited by 37 publications

(33 citation statements)

References 46 publications

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“…The same observation has been made for apoferritin by Gapinski et al 51 Only for very high volume fractions the situation might be inversed since then the hydrodynamic interactions dominate the behavior. 52 Regarding the Soret coefficient, in general, an increase of the ionic strength decreases the value of S T , although increasing temperature and fd-Y21M concentration makes the differences smaller.…”

Section: Ionic Strength Dependencementioning

confidence: 99%

Thermal Diffusion of a Stiff Rod-Like Mutant Y21M fd-Virus

et al. 2011

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We investigated the thermal diffusion phenomena of a rod-like mutant filamentous fd-Y21M virus in the isotropic phase, by means of an improved infrared thermal diffusion forced Rayleigh scattering (IR-TDFRS) set-up crucial for measurements of slowly diffusing systems.Since this is the first thermal diffusion study of a stiff anisotropic solute, we investigate the influence of the shape anisotropy on the thermal diffusion behavior. The influence of temperature, fd-Y21M concentration and ionic strength in relation with the thermodiffusion properties is discussed. We characterize and eliminate the effect of these parameters on the absolute diffusion of the rods and show that diffusion determines the behavior of the Soret coefficient because the thermal diffusion coefficient is constant in the investigate regime. Our results indicate that for the thermal diffusion behavior structural changes of the surrounding water are more important than structural changes between the charged macroions. In the investigated temperature and concentration range, the fd-Y21M virus is thermophobic for the low salt content, while the solutions with the high salt content change from thermophobic to thermophilic behavior with decreasing the temperature. A comparison with recent measurements of other charged soft and biological matter systems shows that the shape anisotropy of the fd-virus becomes not visible in the results.

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Section: Ionic Strength Dependencementioning

confidence: 99%

Thermal Diffusion of a Stiff Rod-Like Mutant Y21M fd-Virus

et al. 2011

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“…In literature, only few studies where dynamical phenomena are tracked at the scale of the individual anisotropic particles are known. Sofar, the most versatile rodlike model systems have been the filamentous bacteriophages fd-wt [12,[15][16][17]. These biological rods have an aspect ratio larger than 100, and each virus is essentially identical to each other in diameter and contour length, allowing for the formation of the smectic phase [13].…”

Section: Introductionmentioning

confidence: 99%

Dynamics in the smectic phase of stiff viral rods

2011

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We report on the dynamics in colloidal suspensions of stiff viral rods, called fd-Y21M. This mutant filamentous virus exhibits a persistence length 3.5 times larger than the wild-type fd-wt. Such a virus system can be used as a model system of rodlike particles for studying their self-diffusion. In this paper, the physical features, such as rod contour length and polydispersity have been determined for both viruses. The effect of viral rod flexibility on the location of the nematic-smectic phase transition has been investigated, with a focus on the underlying dynamics studied more specifically in the smectic phase. Direct visualization of the stiff fd-Y21M at the scale of a single particle has shown the mass transport between adjacent smectic layers, as found earlier for the more flexible rods. We could relate this hindered diffusion with the smectic ordering potentials for varying rod concentrations. The self-diffusion within the layers is far more pronounced for the stiff rods as compared to the more flexible fd-wt viral rod.

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“…Hence, we ignore hydrodynamic interactions that might be important. 26 We use the final state of a relaxed system obtained from a NPT molecular dynamics simulation at a given pressure as the initial state for a BD simulation at a particle density corresponding to that pressure. This way we make certain that the systems are relaxed at the given densities.…”

Section: Model and Simulation Methodsmentioning

confidence: 99%

“…The discrepancy might be due to the small aspect ratio of our particles compared to that of fd virus or the impact of hydrodynamic interactions that we ignore completely. 26 …”

Section: Dynamics On Both Sides Of N-sm-a Phase Transitionmentioning

confidence: 99%

“…The study of kinetics at the level of an individual particle in suspensions of colloidal particles has been made possible by the recent advances in experimental techniques, such as fluorescence microscopy. [22][23][24][25] Lettinga et al 25,26 measured the self-diffusion of semi-flexible fd virus particles in isotropic and nematic phases. In qualitative agreement with simulations of hard spherocylinders 27 and ellipsoids, 28 they found that the ratio of the diffusion constant parallel to the director (D ) and the one perpendicular to it (D ⊥ ) increases as the nematic order parameter increases.…”

Section: Introductionmentioning

confidence: 99%

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Effect of bending flexibility on the phase behavior and dynamics of rods

Naderi

Schoot

2014

The Journal of Chemical Physics

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Articles you may be interested inThe phase behavior, structure, and dynamics of rodlike mesogens with various flexibility using dissipative particle dynamics simulation J. Chem. Phys. 133, 144911 (2010) Effect of bending flexibility on the phase behavior and dynamics of rods Saber Naderi 1,2,a) and Paul van der Schoot 1,3 We study by means of molecular and Brownian dynamics simulations the influence of bending flexibility on the phase behavior and dynamics of monodisperse hard filamentous particles with an aspect ratio of 8 and persistence lengths equal to 3 and 11 times the particle length. Although our particles are much shorter, the latter corresponds to the values for wild-type and mutant fd virus particles that have been subject of a recent experimental study, where the diffusion of these particles in the nematic and smectic-A phase was investigated by means of video fluorescence microscopy [E. Pouget, E. Grelet, and M. P. Lettinga, Phys. Rev. E 84, 041704 (2011)]. In agreement with theoretical predictions and simulations, we find that for the more flexible particles (shorter persistence length) the nematic (N) to smectic-A (Sm-A) phase transition shifts to larger values of the particle density. Interestingly, we find that for the more rigid particles (larger persistence length), the smectic layer-tolayer distance decreases monotonically with increasing density, whereas for the more flexible ones, it first increases, reaches a maximum and then decreases. For our more flexible particles, we find a smectic-B phase at sufficiently high densities. Moreover, in line with experimental observations and theoretical predictions, we find heterogeneous dynamics in the Sm-A phase, in which particles hop between the smectic layers. We compare the diffusion of our two types of particle at identical values of smectic order parameter, and find that flexibility does not change the diffusive behavior of particles along the director yet significantly slows down the diffusion perpendicular to it. In our simulations, the ratio of diffusion constants along and perpendicular to the director decreases just beyond the N-Sm-A phase transition for both our stiff and more flexible particles. © 2014 AIP Publishing LLC.

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Hydrodynamic interactions in rod suspensions with orientational ordering

Cited by 37 publications

References 46 publications

Thermal Diffusion of a Stiff Rod-Like Mutant Y21M fd-Virus

Thermal Diffusion of a Stiff Rod-Like Mutant Y21M fd-Virus

Dynamics in the smectic phase of stiff viral rods

Effect of bending flexibility on the phase behavior and dynamics of rods

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