Nanoroughness impact on liquid-liquid displacement
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The influence of surface nanoroughness on the static and dynamic behavior of a solid-water-dodecane contact line is investigated. Surface roughness is found to affect the substrate static and dynamic wettability for root-mean-square roughnesses below 7 nm. The kinetics of liquid-liquid displacement is slowed down drastically by the nanoroughness. Nevertheless, contact line motion is found to be governed by a thermally activated process. This process is not based on a pure molecular adsorption-desorption mechanism. Instead, two different nanoscale local displacements mechanisms occurring in the vicinity of the contact line may account for the thermally activated dynamics: we suggest that both molecular adsorption-desorption processes and contact line pinning on nanodefects play significant roles in controlling water displacement by dodecane on surfaces which are rough at the nanoscale.
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Ramiasa, M.; Ralston, J.; Fetzer, R.; Sedev, Rossen (2011)The dynamics of a receding water front displaced by (a) an immiscible droplet of dodecane and (b) an air bubble on smooth thiol and silane coated substrates has been investigated. For velocities below 0.02 m/s, the three ...
Ramiasa, M.; Ralston, J.; Fetzer, R.; Sedev, Rossen; Fopp-Spori, D.; Morhard, C.; Pacholski, C.; Spatz, J. (2013)The motion of a solid-liquid-liquid contact line over nanorough surfaces is investigated. The surface nanodefects are varied in size, density, and shape. The dynamics of the three-phase contact line on all nanorough ...
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