Two-dimensional Brownian motion of anisotropic dimers
arXiv:2108.00741 · doi:10.1103/PhysRevE.104.014605
Abstract
We study the 2D motion of colloidal dimers by single-particle tracking and compare the experimental observations obtained by bright-field microscopy to theoretical predictions for anisotropic diffusion. The comparison is based on the mean-square displacements in the laboratory and particle frame as well as generalizations of the self-intermediate scattering functions, which provide insights into the rotational dynamics of the dimer. The diffusional anisotropy leads to a measurable translational-rotational coupling that becomes most prominent by aligning the coordinate system with the initial orientation of the particles. In particular, we find a splitting of the time-dependent diffusion coefficients parallel and perpendicular to the long axis of the dimer which decays over the orientational relaxation time. Deviations of the self-intermediate scattering functions from pure exponential relaxation are small but can be resolved experimentally. The theoretical predictions and experimental results agree quantitatively.
References in corpus (30)
- Circular motion of asymmetric self-propelling particles
- Differential Dynamic Microscopy: Probing wave vector dependent dynamics with a microscope
- Brownian motion of a self-propelled particle
- Dynamics of a Brownian circle swimmer
- Gravitaxis of asymmetric self-propelled colloidal particles
- Differential Dynamic Microscopy of Bacterial Motility
- Universal relation between instantaneous diffusivity and radius of gyration of proteins in aqueous solution
- Anomalous dynamics of intruders in a crowded environment of mobile obstacles
- Confocal microscopy of colloidal particles: towards reliable, optimum coordinates
- Diffusion of an ellipsoid in bacterial suspensions
- Probing the spatiotemporal dynamics of catalytic Janus particles with single-particle tracking and differential dynamic microscopy
- Intermediate scattering function of an anisotropic active Brownian particle
- Highly accelerated simulations of glassy dynamics using GPUs: caveats on limited floating-point precision
- Anisotropic memory effects in confined colloidal diffusion
- Brownian Motion of Boomerang Colloidal Particles
- Self-diffusion in two-dimensional hard ellipsoid suspensions
- Intermediate scattering function of an anisotropic Brownian circle swimmer
- Brownian Motion of Arbitrarily Shaped Particles in Two-Dimensions
- Effective Perrin theory for the anisotropic diffusion of a strongly hindered rod
- Crowding-Enhanced Diffusion: An Exact Theory for Highly Entangled Self-Propelled Stiff Filaments
- Characterization of anisotropic nano-particles by using depolarized dynamic light scattering in the near field
- Mode-coupling theory for multiple decay channels
- Dark Field Differential Dynamic Microscopy enables the accurate characterization of the roto-translational dynamics of bacteria and colloidal clusters
- Decoupling of translational and rotational diffusion in quasi-2D colloidal fluids
- Microscopic dynamics of thin hard rods
- Short-time dynamics of monomers and dimers in quasi-two-dimensional colloidal mixtures
- Exact solution for the force-extension relation of a semiflexible polymer under compression
- Flexibility-induced effects in the Brownian motion of colloidal trimers
- Tube Concept for Entangled Stiff Fibers Predicts Their Dynamics in Space and Time
- The non-Gaussian tops and tails of diffusing boomerangs
Cited by in corpus (6)
- Brownian motion of droplets induced by thermal noise
- Self-propulsion with speed and orientation fluctuation: exact computation of moments and dynamical bistabilities in displacement
- Intermediate scattering function of a gravitactic circle swimmer
- Two-dimensional Brownian motion with dependent components: turning angle analysis
- Intermediate scattering function of colloids in a periodic laser field
- Non-Gaussian Rotational Diffusion and Swing Motion of Dumbbell Probes in Two Dimensional Colloids