Axial Thermal Rotation of Slender Rods

Li, Dichuan; Fakhri, Nikta; Pasquali, Matteo; Biswal, Sibani Lisa

doi:10.1103/physrevlett.106.188302

Cited by 10 publications

(9 citation statements)

References 21 publications

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“…For qualitative study, we make a Rouse dynamics simplification and assume local isotropic drag using slender-body theory [34] ~2 /log 2 / ~ , and ignore long range hydrodynamic interactions. The fluid viscosity, measured to be η = 0.0022 kg/m•s, is used to account for the near wall effect [35]. To calculate the internal stresses caused by the conservative forces, we utilize the principle of virtual work [36,37].…”

Section: Theorymentioning

confidence: 99%

Nonlinear multimode buckling dynamics examined with semiflexible paramagnetic filaments

Zhao

Biswal

2018

Phys. Rev. E

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We present the contractile buckling dynamics of superparamagnetic filaments using experimental, theoretical, and simulation approaches. Under the influence of an orthogonal magnetic field, flexible magnetic filaments exhibit higher-order buckling dynamics that can be identified as occurring in three stages: initiation, development, and decay. Unlike initiation and decay stages where the balance between magnetic interactions and elastic forces is dominant, in the development stage, the influence of hydrodynamic drag results in transient buckling dynamics that is nonlinear along the filament contour. The inhomogeneous temporal evolution of the buckling wavelength is analyzed and the contractions under various conditions are compared.

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Section: Theorymentioning

confidence: 99%

Nonlinear multimode buckling dynamics examined with semiflexible paramagnetic filaments

Zhao

Biswal

2018

Phys. Rev. E

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“…Rotational diffusion of micrometersized ellipsoids can be monitored through their orientation, where it is found that in quasi two-dimensional confinement, the anisotropy of diffusion is strongly affected [16]. Two-dimensional rotational diffusion of micron-sized rods consisting of DNA-linked spherical colloids has been probed by direct imaging [17]. The measurement of rotational diffusion of spheres is much more complicated.…”

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confidence: 99%

Rotational Diffusion of Spherical Colloids Close to a Wall

et al. 2012

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There is currently no experimental technique available to probe spatially resolved rotational diffusion of nanoparticles in the vicinity of a wall. We present the first experimental study of rotational diffusion of small spherical colloids, using dynamic evanescent wave scattering. A setup is used where the wave vector components parallel and perpendicular to the wall can be varied independently, and an expression is derived for the first cumulant of the intensity correlation function in VH evanescent wave geometry for optically anisotropic spheres. The experimental results are in agreement with theoretical predictions that take particle-wall hydrodynamic interactions into account.

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“…Experimentally, it is difficult to observe the near-wall Brownian motion of the slender particle with conventional optical methods because of complicated light scatterings. Particularly, a direct visualization of the minute change of the inclined angle between the moving particle and the surface has been elusive [14,17] and previous works typically assumed the particle being parallel to the wall [12,25]. In this work, we report an experimental study of the Brownian motion of nanowires tethered on a substrate.…”

Section: Introductionmentioning

confidence: 99%

Brownian motion of tethered nanowires

Ota

et al. 2014

Phys. Rev. E

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Brownian motion of slender particles near a boundary is ubiquitous in biological systems and in nanomaterial assembly, but the complex hydrodynamic interaction in those systems is still poorly understood. Here, we report experimental and computational studies of the Brownian motion of silicon nanowires tethered on a substrate. An optical interference method enabled direct observation of microscopic rotations of the slender bodies in three dimensions with high angular and temporal resolutions. This quantitative observation revealed anisotropic and angle-dependent hydrodynamic wall effects: rotational diffusivity in inclined and azimuth directions follows different power laws as a function of the length, ∼ L(-2.5) and ∼ L(-3), respectively, and is more hindered for smaller inclined angles. In parallel, we developed an implicit simulation technique that takes the complex wire-wall hydrodynamic interactions into account efficiently, the result of which agreed well with the experimentally observed angle-dependent diffusion. The demonstrated techniques provide a platform for studying the microrheology of soft condensed matters, such as colloidal and biological systems near interfaces, and exploring the optimal self-assembly conditions of nanostructures.

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Axial Thermal Rotation of Slender Rods

Cited by 10 publications

References 21 publications

Nonlinear multimode buckling dynamics examined with semiflexible paramagnetic filaments

Nonlinear multimode buckling dynamics examined with semiflexible paramagnetic filaments

Rotational Diffusion of Spherical Colloids Close to a Wall

Brownian motion of tethered nanowires

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