Translational viscous drags of an ellipsoid straddling an interface between two fluids

Boniello, Giuseppe; Stocco, Antonio; Gross, Michel; Martin, Ivar; Blanc, Christophe; Nobili, Maurizio

doi:10.1103/physreve.94.012602

Cited by 9 publications

(12 citation statements)

References 28 publications

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“…For hydrophobic particles ∥ strongly increases; translational drag at the interface overcomes the drag in the bulk despite the decreasing immersion in the liquid of the particles (and more exposure to the gas). The same qualitative behavior is observed for spheroidal particles too [68]. This study shows a significant dependency on the aspect ratio: for comparable wetting, the most anisotropic particles have the largest drag.…”

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confidence: 78%

Motion of micro- and nano- particles interacting with a fluid interface

Villa

Boniello

Stocco

et al. 2020

Advances in Colloid and Interface Science

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In this article, we review both theoretical models and experimental results on the motion of micro-and nanoparticles that are close to a fluid interface or move in between two fluids. Viscous drags together with dissipations due to fluctuations of the fluid interface and its physicochemical properties affect strongly the translational and rotational drags of colloidal particles, which are subjected to Brownian motion in thermal equilibrium. Even if many theoretical and experimental investigations have been carried out, additional scientific efforts in hydrodynamics, statistical physics, wetting and colloid science are still needed to explain unexpected experimental results and to measure particle motion in time and space scales, which are not accessible so far.

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supporting

confidence: 78%

Motion of micro- and nano- particles interacting with a fluid interface

Villa

Boniello

Stocco

et al. 2020

Advances in Colloid and Interface Science

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“…32 The slowing down of the rotational diffusion for passive Janus particles (ω = 0) agrees with measurements recently done on low aspect ratio ellipsoidal particles. 33,34 More detailed results on passive Janus particles will be given in a forthcoming paper in which the effect of partial wetting on the rotational and translational motion will be described.…”

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confidence: 99%

Janus Colloids Actively Rotating on the Surface of Water

et al. 2017

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Biological or artificial microswimmers move performing trajectories of different kinds such as rectilinear, circular, or spiral ones. Here, we report on circular trajectories observed for active Janus colloids trapped at the air-water interface. Circular motion is due to asymmetric and nonuniform surface properties of the particles caused by fabrication. Motion persistence is enhanced by the partial wetted state of the Janus particles actively moving in two dimensions at the air-water interface. The slowing down of in-plane and out-of-plane rotational diffusions is described and discussed.

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“…In practical situations, particle-laden interfaces are driven out of equilibrium by an external flow (Stancik et al 2002, 2003; Lishchuk et al 2006; Lishchuk 2016; Vidal & Botto 2017), by dynamic external fields (Belkin et al 2007; Grzybowski et al 2000; Snezhko & Aranson 2011; Wang et al 2017), or by acoustic waves (Poulichet & Garbin 2015; Poulichet et al 2017). Recent work on the dynamics of particles adsorbed on an interface focused on the mobility coefficients of a single (Danov et al 1995, 2000; Fischer et al 2006; Pozrikidis 2007; Dörr et al 2016; Boniello et al 2016; Koplik & Maldarelli 2017) or a pair of colloidal particles (Dani et al 2015) that move tangentially to the interface without deforming it.…”

Section: Introductionmentioning

confidence: 99%

Capillary interactions between dynamically forced particles adsorbed at a planar interface and on a bubble

Corato

Garbin

2018

J. Fluid Mech.

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We investigate the dynamic interfacial deformation induced by micrometric particles exerting a periodic force on a planar interface or on a bubble, and the resulting lateral capillary interactions. Assuming that the deformation of the interface is small, neglecting the effect of viscosity and assuming point particles, we derive analytical formulas for the dynamic deformation of the interface. For the case of a planar interface the dynamic point force simply generates capillary waves, while for the case of a bubble it excites shape oscillations, with a dominant deformation mode that depends on the bubble radius for a given forcing frequency. We evaluate the lateral capillary force acting between two particles, by superimposing the deformations induced by two point forces. We find that the lateral capillary forces experienced by dynamically forced particles are non-monotonic and can be repulsive. The results are applicable to micrometric particles driven by different dynamic forcing mechanisms such as magnetic, electric or acoustic fields.

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Translational viscous drags of an ellipsoid straddling an interface between two fluids

Cited by 9 publications

References 28 publications

Motion of micro- and nano- particles interacting with a fluid interface

Motion of micro- and nano- particles interacting with a fluid interface

Janus Colloids Actively Rotating on the Surface of Water

Capillary interactions between dynamically forced particles adsorbed at a planar interface and on a bubble

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