Decoupling of translational and rotational diffusion in quasi-2D colloidal fluids

Vivek, Skanda; Weeks, Eric R.

doi:10.1063/1.4996733

Cited by 18 publications

(13 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Colloidal experiments have been very important for the understanding of the dynamics and phase behavior of twodimensional (2D) systems. Examples are experiments on the nature of the two-stage melting scenario [1][2][3][4][5], the structure and diffusion in 2D fluids [6][7][8][9][10][11][12][13][14][15][16][17][18][19], the diffusion through 2D random energy landscapes and porous media [20][21][22][23][24], or the glass transition in 2D [25][26][27][28][29][30][31][32]. These experimental studies have been performed on well-characterized model systems in a quasi-2D geometry, which is realized by either sedimenting a monolayer of colloidal particles on a glass plate [13][14][15][16][17], confining the particles between closely spaced glass plates [8,9,33,34], or suspending them on the waterair interface of a water drop [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Long-time self-diffusion in quasi-two-dimensional colloidal fluids of paramagnetic particles

et al. 2020

View full text Add to dashboard Cite

The effect of hydrodynamic interactions (HI) on the long-time self-diffusion in quasi-two-dimensional fluids of paramagnetic colloidal particles is investigated using a combination of experiments and Brownian dynamics (BD) simulations. In the BD simulations, the direct interactions (DI) between the particles consist of a shortranged repulsive part and a long-ranged part that is proportional to 1/r 3 , with r the interparticle distance. By studying the equation of state, the simulations allow for the identification of the regime where the properties of the fluid are fully controlled by the long-ranged interactions, and the thermodynamic state solely depends on the dimensionless interaction strength. In this regime, the radial distribution functions from the simulations are in quantitative agreement with those from the experiments for different fluid area fractions. This agreement confirms that the DI in the experiments and simulations are identical, which thus allows us to isolate the role of HI, as these are not taken into account in the BD simulations. Experiment and simulation fall onto a master curve with respect to the dependence of D L = D L /(D 0 1/2), with D 0 the self-diffusion coefficient at infinite dilution and D L the long-time self-diffusion coefficient. Our results thus show that, although HI affect the short-time selfdiffusion, for a quasi-two-dimensional system with 1/r 3 long-ranged DI, the reduced quantity D L is effectively not affected by HI. Interestingly, this is in agreement with prior work on quasi-two-dimensional colloidal hard spheres.

show abstract

Section: Introductionmentioning

confidence: 99%

Long-time self-diffusion in quasi-two-dimensional colloidal fluids of paramagnetic particles

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Vivek et al . studied coupling and decoupling between translation and rotation of two different types of dimers by comparing the ratios of translational to rotational diffusion coefficients 48 . Coupling can be measured from calculating the coupling diffusion coefficients from the fit to the slope in Fig.…”

Section: Resultsmentioning

confidence: 99%

Diffusion Tensors of Arbitrary-Shaped Nanoparticles in Fluid by Molecular Dynamics Simulation

Zhang

Zhao

Cao

2019

Sci Rep

View full text Add to dashboard Cite

The anisotropic diffusive behavior of nanoparticles with complex shapes attracts great interest due to its potential applications in many fields ranging from bionics to aeronautic industry. Although molecular dynamics (MD) simulations are used widely to investigate nanoparticle diffusion properties, universal methods to describe the diffusion process comprehensively are still lacking. Here, we address this problem by introducing diffusion tensor as it can describe translational and rotational diffusion in three dimensions both individually and their coupling. We take carbon triple sphere suspended in argon fluid as our model system. The consistency of our results and velocity autocorrelation function(VAF) method validates our simulations. The coupling between translational and rotational diffusion is observed directly from analyzing diffusion tensor, and quantified by coupling diffusion coefficient. Our simulation reveals non-trivial effect of some factors in diffusion at nanoscale, which was not considered in previous theories. In addition to introducing an effective method to calculate the diffusion tensor in MD simulations, our work also provides insights for understanding the diffusion process of arbitrary-shaped particles in nanoengineering.

show abstract

“…To experimentally study rotational diffusion in-situ requires the individual particles to have a reference axis. Therefore, initial in-situ studies on rotational diffusion used anisotropic particles [57][58][59][60][61] or Janus spheres (i.e. with a chemically modified hemisphere) [62][63][64][65].…”

Section: Application Of Mptms*/mptms* Engulfed-spheres: Self-assembly and Rotational Diffusionmentioning

confidence: 99%

Contact angle as a powerful tool in anisotropic colloid synthesis

Kamp

Nijs

Baumberg

et al. 2021

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

Decoupling of translational and rotational diffusion in quasi-2D colloidal fluids

Cited by 18 publications

References 38 publications

Long-time self-diffusion in quasi-two-dimensional colloidal fluids of paramagnetic particles

Long-time self-diffusion in quasi-two-dimensional colloidal fluids of paramagnetic particles

Diffusion Tensors of Arbitrary-Shaped Nanoparticles in Fluid by Molecular Dynamics Simulation

Contact angle as a powerful tool in anisotropic colloid synthesis

Contact Info

Product

Resources

About