Nanoroughness impact on liquid-liquid displacement

Melanie Ramiasa, John Ralston, Renate Fetzer, Rossen Sedev

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)10934-10943
Number of pages10
JournalJournal of Physical Chemistry C
Issue number20
Publication statusPublished - 24 May 2012
Externally publishedYes


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