Guided Self‐Propelled Leaping of Droplets on a Micro‐Anisotropic Superhydrophobic Surface

Liu, Jie; Guo, Hao; Zhang, Bo; Qiao, Shasha; Shao, Mingzhe; Zhang, Xuehua; Feng, Xi‐Qiao; Li, Qunyang; Song, Yanlin; Jiang, Lei; Wang, Jianjun

doi:10.1002/anie.201600224

Cited by 145 publications

(100 citation statements)

References 33 publications

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“…[16][17][18][19] In addition to the dynamics of liquid bridge, there is now the added feature of the motion of a three-phase contact line. [23][24][25][26] Considerable efforts have been devoted to studying the reason for the inefficient conversion of released surface energy to translational kinetic energy during droplet jumping process. Recently, it is found that water droplets coalesce on the superhydrophobic surfaces (SHSs) can undergo self-propelled motion, which is called coalescence-induced droplet jumping.…”

Section: Introductionmentioning

confidence: 99%

Morphology evolution and dynamics of droplet coalescence on superhydrophobic surfaces

et al. 2018

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In this work, the coalescence of two equal‐sized water droplets on superhydrophobic surfaces (SHSs) is experimentally investigated. The morphologies of droplet coalescence are observed from side‐view and bottom‐view using high‐speed camera system. The related morphology evolution and dynamics of droplet coalescence are explored. The dynamic behaviors of droplet coalescence on SHSs can be decomposed into liquid bridge growth, contact line evolution, and droplet jumping. The liquid bridge radius is proportional to the square root of time, whereas the dimensionless prefactor is decreased from 1.18 to 0.83 due to the transition of interface curvature. The retraction velocity of the contact line shows limited dependence on initial droplet radii as the retraction dynamics considered here are governed by the capillary–inertial effect. The coalesced droplet finally departs the substrate with a dimensionless jumping velocity of around 0.2. A heuristic argument is made to account for the nearly constant dimensionless jumping velocity. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2913–2921, 2018

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Section: Introductionmentioning

confidence: 99%

Morphology evolution and dynamics of droplet coalescence on superhydrophobic surfaces

et al. 2018

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“…investigated enhanced jumping of condensed water droplets by anti-icing surfaces. Liu et al 9. controlled self-propelled leaping of droplets along a prescribed direction on a micro-anisotropic superhydrophobic surface.…”

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confidence: 99%

Large scale generation of micro-droplet array by vapor condensation on mesh screen piece

Xie

et al. 2017

Sci Rep

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We developed a novel micro-droplet array system, which is based on the distinct three dimensional mesh screen structure and sintering and oxidation induced thermal-fluid performance. Mesh screen was sintered on a copper substrate by bonding the two components. Non-uniform residue stress is generated along weft wires, with larger stress on weft wire top location than elsewhere. Oxidation of the sintered package forms micro pits with few nanograsses on weft wire top location, due to the stress corrosion mechanism. Nanograsses grow elsewhere to show hydrophobic behavior. Thus, surface-energy-gradient weft wires are formed. Cooling the structure in a wet air environment nucleates water droplets on weft wire top location, which is more “hydrophilic” than elsewhere. Droplet size is well controlled by substrate temperature, air humidity and cooling time. Because warp wires do not contact copper substrate and there is a larger conductive thermal resistance between warp wire and weft wire, warp wires contribute less to condensation but function as supporting structure. The surface energy analysis of drops along weft wires explains why droplet array can be generated on the mesh screen piece. Because the commercial material is used, the droplet system is cost effective and can be used for large scale utilization.

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“…By contrast, other animals and plants such as geckos 7 or red roses 8 are able to strongly attract water (high water adhesion) even if they are highly hydrophobic. This property is extremely interesting for water harvesting and transportation systems [9][10][11] or for actuation of underwater locomotion, 12,13 for example. Marmur proposed the use of the term parahydrophobic to distinguish this property from superhydrophobicity.…”

Section: Introductionmentioning

confidence: 99%

Nucleoside surfaces as a platform for the control of surface hydrophobicity

Godeau

Guittard

2016

RSC Adv.

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The control of the surface structures and surface energy of hydrophobic surfaces is extremely important for various potential applications. Here, we report for the first time the synthesis of 3,4-ethylenedioxythiophene (EDOT) derivatives with a nucleoside linker for surface post-functionalization using the Huisgen reaction.Various alkynes are used to graft alkyl, aryl or perfluoroalkyl chains. We show that it is possible to obtain both extremely high water contact angles (q water > 130 ) and extremely high water adhesion (parahydrophobic properties). The highest q water values are obtained with fluorinated compounds but also surprisingly with phenanthrene. The extremely important results obtained with phenanthrene are explained by a change in the surface morphology after post-functionalization from cauliflower-like structures to fibrous structures. These key results are the first step in the study of the effect of nucleosides on the construction of hydrophobic surfaces.

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Guided Self‐Propelled Leaping of Droplets on a Micro‐Anisotropic Superhydrophobic Surface

Cited by 145 publications

References 33 publications

Morphology evolution and dynamics of droplet coalescence on superhydrophobic surfaces

Morphology evolution and dynamics of droplet coalescence on superhydrophobic surfaces

Large scale generation of micro-droplet array by vapor condensation on mesh screen piece

Nucleoside surfaces as a platform for the control of surface hydrophobicity

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