Trapping of drops by wetting defects
Dieter 't Mannetje,Somnath Ghosh,R. Lagraauw,Simon Otten,Arjen Pit,C.W.J. Berendsen,Jos C.H. Zeegers,Dirk van den Ende,Frieder Mugele +8 more
TLDR
The general physical conditions required for capturing sliding drops on an inclined plane that is equipped with electrically tunable wetting defects are determined and it is shown that electrically Tunable defects can be used to guide sliding drops along actively switchable tracks—with potential applications in microfluidics.Abstract:
Controlling the motion of drops on solid surfaces is crucial in many natural phenomena and technological processes including the collection and removal of rain drops, cleaning technology and heat exchangers Topographic and chemical heterogeneities on solid surfaces give rise to pinning forces that can capture and steer drops in desired directions Here we determine general physical conditions required for capturing sliding drops on an inclined plane that is equipped with electrically tunable wetting defects By mapping the drop dynamics on the one-dimensional motion of a point mass, we demonstrate that the trapping process is controlled by two dimensionless parameters, the trapping strength measured in units of the driving force and the ratio between a viscous and an inertial time scale Complementary experiments involving superhydrophobic surfaces with wetting defects demonstrate the general applicability of the concept Moreover, we show that electrically tunable defects can be used to guide sliding drops along actively switchable tracks—with potential applications in microfluidicsread more
Citations
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Hierarchical micro and nano structured, hydrophilic, superhydrophobic and superoleophobic surfaces incorporated in microfluidics, microarrays and lab on chip microsystems
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Enhancing droplet deposition through in-situ precipitation
TL;DR: A physical model is developed to estimate the energy dissipation by the defects and predict the transition from bouncing to sticking and macroscopic enhancements in spray retention and surface coverage for natural and synthetic non-wetting surfaces are demonstrated.
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Electrowetting on liquid-infused film (EWOLF): complete reversibility and controlled droplet oscillation suppression for fast optical imaging.
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Active surfaces: Ferrofluid-impregnated surfaces for active manipulation of droplets
TL;DR: In this article, the authors present a class of active surfaces by stably impregnating active fluids such as ferrofluids into a textured surface, which can manipulate a variety of materials including diamagnetic, conductive and highly viscous fluids, and additionally solid particles.
References
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Wetting: statics and dynamics
TL;DR: In this paper, the authors present an attempt towards a unified picture with special emphasis on certain features of "dry spreading": (a) the final state of a spreading droplet need not be a monomolecular film; (b) the spreading drop is surrounded by a precursor film, where most of the available free energy is spent; and (c) polymer melts may slip on the solid and belong to a separate dynamical class, conceptually related to the spreading of superfluids.
Journal ArticleDOI
Microfluidics: Fluid physics at the nanoliter scale
Todd M. Squires,Stephen R. Quake +1 more
TL;DR: A review of the physics of small volumes (nanoliters) of fluids is presented, as parametrized by a series of dimensionless numbers expressing the relative importance of various physical phenomena as mentioned in this paper.
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Bioinspired self-repairing slippery surfaces with pressure-stable omniphobicity
Tak Sing Wong,Sung Hoon Kang,Sindy K. Y. Tang,Elizabeth Smythe,Benjamin Hatton,Alison Grinthal,Joanna Aizenberg +6 more
TL;DR: A strategy to create self-healing, slippery liquid-infused porous surface(s) (SLIPS) with exceptional liquid- and ice-repellency, pressure stability and enhanced optical transparency, applicable to various inexpensive, low-surface-energy structured materials (such as porous Teflon membrane).
Journal ArticleDOI
Wetting and Spreading
TL;DR: In this article, the surface forces that lead to wetting are considered, and the equilibrium surface coverage of a substrate in contact with a drop of liquid is examined, while the hydrodynamics of both wetting and dewetting is influenced by the presence of the three-phase contact line separating "wet" regions from those that are either dry or covered by a microscopic film.
Journal ArticleDOI
Water capture by a desert beetle
TL;DR: It is shown that these large droplets form by virtue of the insect's bumpy surface, which consists of alternating hydrophobic, wax-coated and hydrophilic, non-waxy regions, and may find application in water-trapping tent and building coverings, for example, or in water condensers and engines.