Anisotropic scaling lengths of colloidal monolayers near a water–air interface

Li, Na; Zhang, Wei; Jiang, Zehui; Chen, Wei

doi:10.1017/jfm.2020.693

Cited by 2 publications

(5 citation statements)

References 45 publications

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“…In the longitudinal direction, the HIs respond to a 3D shear stress that is similar to that in a 3D bulk liquid, and in the transverse direction, the HIs respond to a 2D compressive stress 12,24 . The anisotropy of the characteristic lengths 𝑅 ‖ and 𝑅 ⊥ of a colloidal monolayer near a water-oil interface is also similar to that near a water-air interface 30 . This anisotropic behavior can be explained by analogy to the lubrication force between two solid walls 30,34 .…”

Section: (A)mentioning

confidence: 62%

“…The anisotropy of the characteristic lengths 𝑅 ‖ and 𝑅 ⊥ of a colloidal monolayer near a water-oil interface is also similar to that near a water-air interface 30 . This anisotropic behavior can be explained by analogy to the lubrication force between two solid walls 30,34 .…”

Section: (A)mentioning

confidence: 62%

“…2 (Sample S1) and Fig. S2 (Sample S3), since such collapse never found in monolayers near a water-air interface 30 . We think the difference of 𝐷 ∥,⊥ induced by the change of particle concentrations lie already in 𝐷 s (𝑛), but only in the part of 𝐷 𝑠 ′ (𝑛).…”

Section: (A)mentioning

confidence: 88%

“…In the system of a water-oil interface, the scaled correlated diffusion coefficients 𝐷 ̃∥,⊥ (𝑟 ∥,⊥ ′ ) are independent on the separation 𝑧 , as seen in Fig. 4(c, d), while 𝐷 ̃∥,⊥ (𝑟 ∥,⊥ ′ ) in the water-air system are dependent on the separation 𝑧 30 . Comparing these two systems, the significant difference is that the viscosity and mass density of the air can be negligible comparing with oil.…”

Section: (A)mentioning

confidence: 91%

“…In such a scenario, this system can be regarded as similar to a 3D bulk system. However, the HIs in the monolayer will be influenced by the interface, such as that in monolayers near a water-air interface 30 . Thus, it is interesting to consider which kind of HI behavior can be expected in a colloidal monolayer near a water-oil interface.…”

Section: Introductionmentioning

confidence: 99%

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Relationship between characteristic lengths and effective Saffman length in colloidal monolayers near a water–oil interface*

Zhang

Chen

2019

Chinese Phys. B

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The hydrodynamic interactions (HIs) in colloidal monolayers are strongly influenced by the boundary conditions and can be directly described in terms of the cross-correlated diffusion of the colloid particles. In this work, we experimentally 2 measured the cross-correlated diffusion in colloidal monolayers near a water-oil interface. The characteristic lengths of the system were obtained by introducing an effective Saffman length. The characteristic lengths of a particle monolayer near a water-oil interface were found to be anisotropic in the longitudinal and transverse directions. From these characteristic lengths, the master curves of cross-correlated diffusion are obtained, which universally describe the HIs near a liquid-liquid interface.

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Section: (A)mentioning

confidence: 62%

Section: (A)mentioning

confidence: 62%

Section: (A)mentioning

confidence: 88%

Section: (A)mentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Relationship between characteristic lengths and effective Saffman length in colloidal monolayers near a water–oil interface*

Zhang

Chen

2019

Chinese Phys. B

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Scaling law of correlated diffusion of colloidal particles confined to a rugged surface

2023

Physics of Fluids

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Using optical microscopy and multiparticle tracking techniques, we investigate the correlated diffusion of colloidal particles over a rugged surface. Our findings demonstrate that the correlated diffusion caused by the hydrodynamic interactions of particles confined to energy landscapes displays a distinctive power-law behavior. The local energy landscape on the rugged surface reduces the long-range hydrodynamic interactions between colloidal particles. The energy landscape influences the strength of hydrodynamic interactions, but not their power-law form. The responding factor of the colloidal particles over the energy landscape to hydrodynamics decays exponentially with the potential energy minimum. We propose a scaling method, with which the correlated diffusion of colloidal particles over various energy landscapes can be scaled onto a master curve. The master curve characterizes the response of the particles over the energy landscape to the hydrodynamics. The scale factors used for the master curve allow for the calculation of the energy landscape. The findings provide physical insights into the confinement hydrodynamics and would be helpful for designing material surfaces and controlling the motion of particles on rough surfaces.

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Anisotropic scaling lengths of colloidal monolayers near a water–air interface

Abstract: Abstract

Cited by 2 publications

References 45 publications

Relationship between characteristic lengths and effective Saffman length in colloidal monolayers near a water–oil interface*

Relationship between characteristic lengths and effective Saffman length in colloidal monolayers near a water–oil interface*

Scaling law of correlated diffusion of colloidal particles confined to a rugged surface

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