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Molecular origin of contact line friction in dynamic wetting
KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Applied Physics, Biophysics.ORCID iD: 0000-0001-9160-2549
KTH, Centres, SeRC - Swedish e-Science Research Centre. KTH, School of Engineering Sciences (SCI), Applied Physics, Biophysics.ORCID iD: 0000-0002-7498-7763
2018 (English)In: Physical Review Fluids, E-ISSN 2469-990X, Vol. 3, no 7, article id 074201Article in journal (Refereed) Published
Abstract [en]

A hydrophilic liquid, such as water, forms hydrogen bonds with a hydrophilic substrate. The strength and locality of the hydrogen bonding interactions prohibit slip of the liquid over the substrate. The question then arises how the contact line can advance during wetting. Using large-scale molecular dynamics simulations we show that the contact line advances by single molecules moving ahead of the contact line through two distinct processes: either moving over or displacing other liquid molecules. In both processes friction occurs at the molecular scale. We measure the energy dissipation at the contact line and show that it is of the same magnitude as the dissipation in the bulk of a droplet. The friction increases significantly as the contact angle decreases, which suggests suggests thermal activation plays a role. We provide a simple model that is consistent with the observations.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2018. Vol. 3, no 7, article id 074201
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-232392DOI: 10.1103/PhysRevFluids.3.074201ISI: 000437675700001Scopus ID: 2-s2.0-85051108122OAI: oai:DiVA.org:kth-232392DiVA, id: diva2:1235687
Funder
EU, European Research Council, 258980Swedish Research Council, 2014-04505
Note

QC 20180726

Available from: 2018-07-26 Created: 2018-07-26 Last updated: 2019-04-04Bibliographically approved

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Johansson, PetterHess, Berk

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