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/

Zendy Plus

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

Zendy Tools

Zendy Open

In recent years, there has been a considerable interest in the mechanics ofsoft objects meeting fluid interfaces (elasto-capillary interactions). In thiswork we experimentally examine the case of a fluid resting on a thin film ofrigid material which, in turn, is resting on a fluid substrate. To simplifycomplexity, we adapt the experiment to a one-dimensional geometry and examinethe behaviour of polystyrene and polycarbonate films directly with confocalmicroscopy. We find that the fluid meets the film in a manner consistent withthe Young-Dupr\'e equation when the film is thick, but transitions to whatappears similar to a Neumann like balance when the thickness is decreased.However, on closer investigation we find that the true contact angle is alwaysgiven by the Young construction. The apparent paradox is a result ofmacroscopically measured angles not being directly related to true microscopiccontact angles when curvature is present. We model the effect with theEuler-Bernoulli beam on a Winkler foundation as well as with an equivalentenergy based capillary model. Notably, the models highlight several importantlengthscales and the complex interplay of tension, gravity and bending in theproblem.

Microscopic Details of a Fluid/Thin Film Triple Line