English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The shape of a liquid-air interface advancing on a heterogeneous surface wasstudied experimentally, together with the force induced by the pinning of thecontact line to surface defects. Different surfaces were considered withcircular defects introduced as arrays of cocoa butter patches or small circularholes. These heterogeneous surfaces were submerged into aqueous ethanolsolutions, while measuring the additional force arising from the deformation ofthe advancing contact line and characterising the interface shape and itspinning on the defects. Initially, the submersion force is linear withsubmerged depth, suggesting a constant defect-induced stiffness. This regimeends when the contact line de pins from the defects. A simple scaling isproposed to describe the depinning force and the depinning energy. We findthat, as the defect separation increases, the interface stiffness increasestoo, with a weak dependency on the defect radius. This interaction betweendefects cannot be captured by the simple scaling, but can be well predicted bya theory considering the interface deformation in presence of periodic arraysof holes. Creating a 4-phase contact line, by including solid defects (cocoabutter) reduced pinning forces. The radius of the defect had a nonlinear effecton the depinning depth. The 4-phase contact line resulted in depinning beforethe defects are fully submerged. These experimental results and the associatedtheory help understanding quantitatively the extent to which surfaceheterogeneities can slow down wetting. This in turn paves the way to tailor thedesign of heterogeneous surfaces, towards desired wetting performances.

Effect of Macroscopic Surface Heterogeneities on an Advancing Contact Line