Through-drop imaging of moving contact lines and contact areas on opaque water-repellent surfaces

dc.contributorAalto Universityen
dc.contributor.authorVieira, Arthur Freitasen_US
dc.contributor.authorCui, Wenjuanen_US
dc.contributor.authorJokinen, Villeen_US
dc.contributor.authorRas, Robin H.A.en_US
dc.contributor.authorZhou, Quanen_US
dc.contributor.departmentDepartment of Electrical Engineering and Automationen
dc.contributor.departmentDepartment of Chemistry and Materials Scienceen
dc.contributor.departmentDepartment of Applied Physicsen
dc.contributor.groupauthorRobotic Instrumentsen
dc.contributor.groupauthorSoft Matter and Wettingen
dc.contributor.groupauthorCenter of Excellence in Life-Inspired Hybrid Materials, LIBERen
dc.description| openaire: EC/H2020/725513/EU//SuperRepel
dc.description.abstractA myriad of natural surfaces such as plant leaves and insect wings can repel water and remain unwetted inspiring scientists and engineers to develop water-repellent surfaces for various applications. Those natural and artificial water-repellent surfaces are typically opaque, containing micro- and nano-roughness, and their wetting properties are determined by the details at the actual liquid-solid interface. However, a generally applicable way to directly observe moving contact lines on opaque water-repellent surfaces is missing. Here, we show that the advancing and receding contact lines and corresponding contact area on micro- and nano-rough water-repellent surfaces can be readily and reproducibly quantified using a transparent droplet probe. Combined with a conventional optical microscope, we quantify the progression of the apparent contact area and apparent contact line irregularity in different types of superhydrophobic silicon nanograss surfaces. Contact angles near 180° can be determined with an uncertainty as low as 0.2°, that a conventional contact angle goniometer cannot distinguish. We also identify the pinning/depinning sequences of a pillared model surface with excellent repeatability and quantify the progression of the apparent contact interface and contact angle of natural plant leaves with irregular surface topography.en
dc.description.versionPeer revieweden
dc.identifier.citationVieira, A F, Cui, W, Jokinen, V, Ras, R H A & Zhou, Q 2023, ' Through-drop imaging of moving contact lines and contact areas on opaque water-repellent surfaces ', Soft Matter, vol. 19, no. 13, pp. 2350-2359 .
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dc.publisherRoyal Society of Chemistry
dc.relation.ispartofseriesSoft Matteren
dc.titleThrough-drop imaging of moving contact lines and contact areas on opaque water-repellent surfacesen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi