Coalescence of Immiscible Liquid Metal Drop on Graphene

Tao, Li; Li, Jie; Wang, Long; Duan, Yunrui; Li, Hui

doi:10.1038/srep34074

Cited by 37 publications

(18 citation statements)

References 46 publications

(51 reference statements)

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“…Since the differences between conventional flat superhydrophobic surfaces and textured superhydrophobic surfaces lie in the existence of textures, their layout should significantly affect the wall wetting behavior and hence droplet dynamics. − Shi et al showed that droplet jumping could be promoted by increasing the texture height or decreasing their spacing . Gao et al performed molecular dynamics simulations and showed that nanodroplets prefer to jump away from those surfaces with decreased surface wettability intensity and solid fraction .…”

Section: Introductionmentioning

confidence: 99%

Critical and Optimal Wall Conditions for Coalescence-Induced Droplet Jumping on Textured Superhydrophobic Surfaces

et al. 2019

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The effectiveness of coalescence-induced jumping of microdroplets on superhydrophobic surfaces is critical to a wide range of applications such as self-cleaning surfaces, anti-icing/frosting, water harvesting, phase-change heat transfer, and hotspot cooling. Introducing textures on the surfaces can readily enlarge the effective contact angle, while an overlarge texture spacing may unfavorably lead to droplet penetration into the gaps in droplet coalescence processes. To clarify the effect of surface textures on the droplet jumping dynamics, we simulated the coalescence of droplets on textured superhydrophobic surfaces with various surface wettability and texture spacings and theoretically derived the critical conditions of jumping and the optimal condition of maximum jumping velocity. The results show that the nonmonotonic emergence of "nonjumping"−"jumping"−"nonjumping" with decreasing solid fraction is synergistically controlled by the surface adhesion and the effective impinging pressure. At a large solid fraction, the transition from "nonjumping" to "jumping" is caused by the reduction of the dimensionless surface adhesion energy below a critical value, which is determined to be 0.035 for Oh = 0.02 and 0.01 for Oh = 0.12. At a small solid fraction, the transition from "jumping" to "nonjumping" is dominated by the reduction of the dimensionless effective impinging pressure, the critical value of which is identified to be 0.14 and is independent of Oh. Moreover, jumping velocity maximizes when wetting critically transits from the Cassie−Baxter (CB) state to the partial-wetting state, and a penetration index is proposed from the wetting theory to predict such transition, which shows good agreement with both present simulations and previous experiments. The present findings are helpful for the design of superhydrophobic surfaces that pursue robust and efficient jumping of droplets.

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Section: Introductionmentioning

confidence: 99%

Critical and Optimal Wall Conditions for Coalescence-Induced Droplet Jumping on Textured Superhydrophobic Surfaces

et al. 2019

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“…Due to the fact that metal and carbon can only form soft bonds via the charge transfer, we use the 12-6 Lennard-Jones (L-J) potential to calculate the Pb–C interaction, which is given as where ε is the depth of the potential wall, σ is the finite distance at which the interparticle potential is zero, and r c is the cutoff distance of 10.0 Å. The related parameters are ε Pb–C = 0.01751 eV and σ Pb–C = 3.288 Å. − …”

Section: Models and Methodsmentioning

confidence: 99%

Controllable Coalescence Dynamics of Nanodroplets on Textured Surfaces Decorated with Well-Designed Wrinkled Nanostructures: A Molecular Dynamics Study

Zhang

2021

Langmuir

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The control of coalescence and motion of droplets play a significant role in advanced technology and our daily life, and one of the most important approaches is surface design. Here, the microtextured surfaces decorated with wrinkled substrates are designed and studied for coalescence behaviors. The simulation results show that the coalescence speed would be slower on such surfaces due to the downward movement of the droplets induced by the penetration of atoms into the grooves that delays their movement along the coalescence direction, which is considered as a restriction effect. With the increase of the angles and the interval distance of wrinkled structures, the coalescence time becomes longer and the coalescing process becomes unfavorable, resulting from the enhanced restriction effect. More importantly, a composite substrate possessing the original and sub-wrinkled structures has been designed to tune the coalescence dynamics. The results of this work may not only help shed light on understanding the coalescence behaviors on the wrinkled substrates but also propose a feasible method for controlling the liquid coalescence behavior, which is expected to provide some useful implications for practical applications.

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“…Gao et al considered that the surface texture structure changed the wetting state of droplets and affected the coalescence-jumping dynamic (Figure c) . When the bottom of the droplet entered the texture structure exhibiting the Wenzel state or the partial wetting state, the droplet was inhibited from leaving the substrate surface. , In addition, some researchers have explained the influence of the microcylinder geometrical parameters on the contact angle of the droplet. Wang et al reported that the static contact angle increased nonlinearly with the increase in the distance of the microcolumn array (Figure d) .…”

Section: Effect Of Superhydrophobic Structurementioning

confidence: 99%

Coalescence-Induced Droplet Jumping

et al. 2021

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When two or more droplets coalesce on a superhydrophobic surface, the merged droplet can jump spontaneously from the surface without requiring any external energy. This phenomenon is defined as coalescence-induced droplet jumping and has received significant attention due to its potential applications in a variety of self-cleaning, anti-icing, antifrosting, and condensation heat-transfer enhancement uses. This article reviews the research and applications of coalescence-induced droplet jumping behavior in recent years, including the influence of droplet parameters on coalescence-induced droplet jumping, such as the droplet size, number, and initial velocity, to name a few. The main structure types and influence mechanism of the superhydrophobic substrates for coalescence-induced droplet jumping are described, and the potential application areas of coalescence-induced droplet jumping are summarized and forecasted.

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Coalescence of Immiscible Liquid Metal Drop on Graphene

Cited by 37 publications

References 46 publications

Critical and Optimal Wall Conditions for Coalescence-Induced Droplet Jumping on Textured Superhydrophobic Surfaces

Critical and Optimal Wall Conditions for Coalescence-Induced Droplet Jumping on Textured Superhydrophobic Surfaces

Controllable Coalescence Dynamics of Nanodroplets on Textured Surfaces Decorated with Well-Designed Wrinkled Nanostructures: A Molecular Dynamics Study

Coalescence-Induced Droplet Jumping

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