Translational and rotational friction on a colloidal rod near a wall

Padding, JT Johan; Briels, Willem J.

doi:10.1063/1.3308649

Cited by 46 publications

(48 citation statements)

References 38 publications

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“…The dynamics is microcanonical, satisfies mass, momentum, and energy conservation, and also preserves phase space volumes. As a result, hydrodynamic interactions both among dimer monomers [52] and with the walls [53] are automatically taken into account. In some cases, in order to assess the importance of hydrodynamic interactions on the collective dynamics, the dynamical simulation algorithm was modified [51] by replacing the multiparticle collision step with choosing the solvent particle postcollision velocities in a cell from a Maxwell-Boltzmann distribution.…”

Section: Mesoscopic Dynamical Modelmentioning

confidence: 99%

Collective dynamics of self-propelled sphere-dimer motors

Thakur

Kapral

2012

Phys. Rev. E

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The collective dynamics of ensembles of chemically powered sphere dimer motors is investigated. Sphere dimers are self-propelled nanomotors built from linked catalytic and noncatalytic spheres. They consume fuel in the environment and utilize the resulting self-generated concentration gradients to produce directed motion along their internuclear axes. In collections of such motors, the individual motors interact through forces that arise from concentration gradients, hydrodynamic coupling, and direct intermolecular forces. Under nonequilibrium conditions it is found that the sphere dimer motors self-assemble into transient aggregates with distinctive structural correlations and exhibit swarming where the aggregates propagate through the system. The mean square displacement of a dimer motor in the ensemble displays short-time ballistic and long-time diffusive regimes and, for ensembles containing many motors, an increasingly prominent intermediate regime. The self-diffusion coefficient of a motor in a many-motor system behaves differently from that of an isolated motor, and the decay of orientational correlations is a nonmonotonic function of the number of motors. The results presented here illustrate the phenomena to be expected in applications, such as cargo transport, where many motors may act in consort.

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Section: Mesoscopic Dynamical Modelmentioning

confidence: 99%

Collective dynamics of self-propelled sphere-dimer motors

Thakur

Kapral

2012

Phys. Rev. E

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“…The inclusion of hydrodynamic interactions gives rise to "corrective terms" in the Brownian dynamics. 31,32 In this regard, Padding and Briels 33 recently computed the friction of a rod immersed in a Newtonian liquid near a single planar wall. A stochastic rotation dynamics method was employed, 34 and a shish-kebab model was used to describe the rodlike particle.…”

Section: Introductionmentioning

confidence: 99%

“…The translational and rotational friction tensors were calculated for different orientations and particle-wall distances. Due to computational limitations, however, a relatively small simulation box was used that, according to the authors themselves, 33 induces some spurious self-interaction with periodic images of the rod and hydrodynamic interactions with the second (far) wall.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics and Brownian motions of a spheroid near a rigid wall

Corato

Greco

D’Avino

et al. 2015

The Journal of Chemical Physics

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Articles you may be interested in PHYSICS 142, 194901 (2015) Hydrodynamics and Brownian motions of a spheroid near a rigid wall In this work, we study in detail the hydrodynamics and the Brownian motions of a spheroidal particle suspended in a Newtonian fluid near a flat rigid wall. We employ 3D Finite Element Method (FEM) simulations to compute how the mobility tensor of the spheroid varies with both the particle-wall separation distance and the particle orientation. We then study the Brownian motion of the spheroid by means of a discretized Langevin equation. We specifically focus on the additional drift terms arising from the position and orientational dependence of the mobility matrix. In this respect, we also propose a numerically convenient approximation of the orientational divergence of the mobility matrix that is required in the solution of the Langevin equation. Our results illustrate that both hydrodynamics and Brownian motions of a spheroidal particle near a confining wall display novel features from those of a sphere in the same type of confinement. C 2015 AIP Publishing LLC. [http://dx

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“…For non spherical particles there is neither theoretical nor experimental work available. It is however expected from computer simulations that rotational dynamics of rods are slowing down drastically in the vicinity of a flat wall [36]. It is therefore a fair assumption that the rotational dynamics of disc-shaped colloids will be much slower in the vicinity of a wall and the surface of a large sphere.…”

Section: Resultsmentioning

confidence: 99%

Shear-affected depletion interaction

2012

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Abstract.We investigate the influence of flow fields on the strength of the depletion interaction caused by disc-shaped depletants. At low mass concentration of discs, it is possible to continuously decrease the depth of the depletion potential by increasing the applied shear rate until the depletion force is not perceivable experimentally. Above a threshold in the platelet mass concentration, the depletion potential can no longer be affected by flow in the accessible range of shear rates. While the observed decrease of depletion strength at low depletant concentration may be ascribed to flow alignment of the discs, it is not clear why the influence of flow is vanishing at high concentrations. In order to observe these effects, a modification of the established total internal reflexion microscopy (TIRM) technique is be implemented. We show the suitability of these modifications to measure particle-wall interaction potentials under non-equilibrium conditions for systems where particles are exposed to a shear.

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Translational and rotational friction on a colloidal rod near a wall

Cited by 46 publications

References 38 publications

Collective dynamics of self-propelled sphere-dimer motors

Collective dynamics of self-propelled sphere-dimer motors

Hydrodynamics and Brownian motions of a spheroid near a rigid wall

Shear-affected depletion interaction

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