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Recent work by McCarthy and colleagues (20) points out that these models are applicable only at the solid-liquidvapor three-phase contact line (drop perimeter) and that the interfacial area within the drop perimeter does not affect either the apparent contact angle or the hysteresis; thus, these models can be easily applied only to surfaces with a homogeneous texture, as considered here.
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Recent work by McCarthy and colleagues (20) points out that these models are applicable only at the solid-liquidvapor three-phase contact line (drop perimeter) and that the interfacial area within the drop perimeter does not affect either the apparent contact angle or the hysteresis; thus, these models can be easily applied only to surfaces with a homogeneous texture, as considered here.
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These surfaces are referred to as micro-hoodoos because their geometry and process of creation are reminiscent of geological features called hoodoos, which are created by soil erosion. Hoodoos are composed of a soft sedimentary rock topped by a piece of harder, less easily eroded stone
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These surfaces are referred to as micro-hoodoos because their geometry and process of creation are reminiscent of geological features called hoodoos, which are created by soil erosion. Hoodoos are composed of a soft sedimentary rock topped by a piece of harder, less easily eroded stone.
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0.5 (capillary length; ρ is the density of liquid), the effect of gravity is negligible and we approximate the liquid-air interface to be a horizontal plane.
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0.5 (capillary length; ρ is the density of liquid), the effect of gravity is negligible and we approximate the liquid-air interface to be a horizontal plane.
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sl is the change in solid-liquid contact area with the advancing or receding of the liquid, and dθ is the change in local contact angle. This criterion also emphasizes the importance of re-entrant surfaces.
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sl is the change in solid-liquid contact area with the advancing or receding of the liquid, and dθ is the change in local contact angle. This criterion also emphasizes the importance of re-entrant surfaces.
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As the surface is pushed toward the water droplet, the droplet moves, and hence the normal force is not transferred perfectly
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As the surface is pushed toward the water droplet, the droplet moves, and hence the normal force is not transferred perfectly.
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36849076115
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The difference in contact angle values from the Cassie prediction is related to contact line pinning
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The difference in contact angle values from the Cassie prediction is related to contact line pinning.
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Supported by Air Force Research Laboratory contract FA9300-06M-T015 and Air Force Office of Scientific Research contracts FA9550-07-1-0272 and LRIR-92PL0COR, with additional student support provided by the NSF Nanoscale Interdisciplinary Research Team on Nanoscale Wetting DMR-0303916, We thank the Institute for Soldier Nanotechnologies at MIT for the use of facilities
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Supported by Air Force Research Laboratory contract FA9300-06M-T015 and Air Force Office of Scientific Research contracts FA9550-07-1-0272 and LRIR-92PL0COR, with additional student support provided by the NSF Nanoscale Interdisciplinary Research Team on Nanoscale Wetting (DMR-0303916). We thank the Institute for Soldier Nanotechnologies at MIT for the use of facilities.
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