Nanoroughness impact on liquid-liquid displacement
Date
2012
Authors
Ramiasa, M.
Ralston, J.
Fetzer, R.
Sedev, R.
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Journal article
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Journal of Physical Chemistry C, 2012; 116(20):10934-10943
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Abstract
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 displace- ments 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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Copyright 2012 American Chemical Society