2014
DOI: 10.1103/physrevlett.113.026101
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Substrate Curvature Gradient Drives Rapid Droplet Motion

Abstract: Making small liquid droplets move spontaneously on solid surfaces is a key challenge in lab-on-chip and heat exchanger technologies. Here, we report that a substrate curvature gradient can accelerate micro- and nanodroplets to high speeds on both hydrophilic and hydrophobic substrates. Experiments for microscale water droplets on tapered surfaces show a maximum speed of 0.42  m/s, 2 orders of magnitude higher than with a wettability gradient. We show that the total free energy and driving force exerted on a dr… Show more

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Cited by 174 publications
(193 citation statements)
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“…Significantly, leaf veins in plants form the gradient of groove, further promoting water shedding under capillary force (32,33). The large gradient of the groove reduces the threshold drainage time (Fig.…”
Section: Reduced Water Drainage Retention On Pendulous Triangular Gromentioning
confidence: 99%
“…Significantly, leaf veins in plants form the gradient of groove, further promoting water shedding under capillary force (32,33). The large gradient of the groove reduces the threshold drainage time (Fig.…”
Section: Reduced Water Drainage Retention On Pendulous Triangular Gromentioning
confidence: 99%
“…2D and Fig. S2), and thus an asymmetric surface energy landscape, which permits a motion (12)(13)(14)(15). A simple argument allows us to understand the origin of the driving force.…”
mentioning
confidence: 99%
“…To study the complicate adhesion system, we use the software Surface Evolver [34] which has been generally applied to simulate the equilibrium shapes of single vesicle [35,36], cell adhesion system [17], random foam [37] and droplet adhesion structure [38]. First, it needs to build an initial geometric model for the structure.…”
Section: Simulation Methods and The Softwarementioning
confidence: 99%