Role reversal: Liquid “Cheerios” on a solid sense each other

Jagota, Anand

doi:10.1073/pnas.1607893113

Cited by 4 publications

(4 citation statements)

References 19 publications

(16 reference statements)

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“…To demonstrate the pinning effect of the step edge visually, digital images showing droplet sliding in "up" and "down" directions around the step edge (SN = 50) were captured and presented in Figure 4c and d. In the "down" direction (Figure 4c), when the tilting angle of the surface was gradually increased from 0° to 10°, the droplet was firstly pinned at the step edge (Figure 4c (ii)), which resulted in the increase of advancing CA as the tilting angle was increased to 20° (Figure 4c (iii)). When the tilting angle was further increased to 30° (Figure 4c (iv)), the wetting ridge around the base of the droplet made contact with the wetting ridge at the corner of the step, which was similar to the phenomenon of the Cheerios effect [67], [68]. Finally, the droplet moved downward and then slid across the top edge of the step with the assistance of gravity.…”

Section: Mechanism Of Tridirectionally Anisotropic Slidingmentioning

confidence: 73%

Programmable droplet transport on multi-bioinspired slippery surface with tridirectionally anisotropic wettability

Cai

Chen²,

Tian³

et al. 2022

Chemical Engineering Journal

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Section: Mechanism Of Tridirectionally Anisotropic Slidingmentioning

confidence: 73%

Programmable droplet transport on multi-bioinspired slippery surface with tridirectionally anisotropic wettability

Cai

Chen²,

Tian³

et al. 2022

Chemical Engineering Journal

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“…(4) Downstairs: the TPCL in the “down” direction was captured by the lubricant meniscus at the step corner and quickly slid into the groove. This phenomenon was similar to the Cheerios effect. , The traction force generated in this process also caused the TPCL in the “up” direction to be pulled back to the edge. (5) Spreading: this process was equivalent to the repetition of the first four stages.…”

Section: Resultsmentioning

confidence: 60%

“…This phenomenon was similar to the Cheerios effect. 44,45 The traction force generated in this process also caused the TPCL in the "up" direction to be pulled back to the edge. ( 5) Spreading: this process was equivalent to the repetition of the first four stages.…”

Section: Bubble Tridirectionally Sliding On Talismentioning

confidence: 99%

Reversible Bubble Transfer on a Bioinspired Tridirectionally Anisotropic Lubricant-Infused Surface

Chen

Cai

Chang

et al. 2023

Ind. Eng. Chem. Res.

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Underwater bubble transfers on functional surfaces with special wettability have important research value for many fields such as water purification, gas-evolving electrochemistry, heterogeneous catalysis, etc. However, realizing multi-interface collaborated and multi-directional bubble transfers are still challenging. Herein, inspired by butterfly wings, pitcher plants, and rice leaves, we present a tridirectionally anisotropic lubricantinfused surface (TALIS) with micro−nano hierarchical step-like structures that are covered with silicone oil. The TALIS exhibits significant tridirectional anisotropy in terms of bubble sliding, specifically, the slippery property parallel to the grooves with an ultra-low bubble sliding angle (BSA) of ∼2°, and the unidirectional wettability perpendicular to the grooves with BSA difference of ∼48°result from the step-edge pinning effect. By adjusting the step height and width, TALISs with different tridirectionally anisotropic wettability and stable bubble-holding efficiency (∼0.4 mg/cm 2 ) are obtained. In addition, horizontal and anti-buoyancy unidirectional bubble transfers are realized by collaborative squeezing of two face-to-face TALISs. By adjusting the distance between the two TALISs, bubbles can be reversibly transferred between the two interfaces by multi-interfaces collaboration. This work opens a new avenue to understand the bubble behaviors on functional interfaces with anisotropic wettability and provides a method to realize controllable bubble transfer on multi directions.

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“…In their experiments, they found that the droplets prefer to move toward a softer substrate where the local apparent contact angle is lower. This idea was further pursued by Karpitschka et al who reported both attraction and repulsion between droplets on a soft elastic substrate, depending on the thickness of the substrate solid, a reverse Cheerios effect . To explain their observation, they computed the deformed shape of the substrate using a small-strain linear elasticity theory and found that the imbalance of surface tension in the horizontal direction provides the driving force.…”

Section: Introductionmentioning

confidence: 99%

Interaction of Droplets Separated by an Elastic Film

Liu¹,

Xu²,

Nadermann

et al. 2016

Langmuir

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The Laplace pressure of a droplet placed on one side of an elastic thin film can cause significant deformation in the form of a bulge on its opposite side. Here, we show that this deformation can be detected by other droplets suspended on the opposite side of the film, leading to interaction between droplets separated by the solid (but deformable) film. The interaction is repulsive when the drops have a large overlap and attractive when they have a small overlap. Thus, if two identical droplets are placed right on top of each other (one on either side of the thin film), they tend to repel each other, eventually reaching an equilibrium configuration where there is a small overlap. This observation can be explained by analyzing the energy landscape of the droplets interacting via an elastically deformed film. We further demonstrate this idea by designing a pattern comprising a big central drop with satellite droplets. This phenomenon can lead to techniques for directed motion of droplets confined to one side of a thin elastic membrane by manipulations on the other side.

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Role reversal: Liquid “Cheerios” on a solid sense each other

Cited by 4 publications

References 19 publications

Programmable droplet transport on multi-bioinspired slippery surface with tridirectionally anisotropic wettability

Programmable droplet transport on multi-bioinspired slippery surface with tridirectionally anisotropic wettability

Reversible Bubble Transfer on a Bioinspired Tridirectionally Anisotropic Lubricant-Infused Surface

Interaction of Droplets Separated by an Elastic Film

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