TY  - JOUR
U1  - Wissenschaftlicher Artikel
A1  - Chudak, Maciej
A1  - Chopra, Vaishali
A1  - Hensel, René
A1  - Darhuber, Anton A.
T1  - Elastohydrodynamic Dewetting of Thin Liquid Films: Elucidating Underwater Adhesion of Topographically Patterned Surfaces
JF  - Langmuir
N2  - In underwater adhesion of a topographically patterned surface with a very soft material such as human skin, the elastic deformation can be large enough to achieve solid-on-solid contact not only on top of the hills but also in the valleys of the substrate topography. In this context, we have studied the dynamics of dewetting of a thin liquid film confined between a rigid, periodic micropillar array and a soft, elastic sphere. In our experiments, we observed two very distinct dewetting morphologies. For large ratios of array period to micropillar height and width, the dewetted areas tend to have a diamond-like shape and expand with a rate similar to a flat, unpatterned substrate. When the array period is reduced, the morphology of the dry spot becomes irregular and its expansion rate is significantly reduced. We developed a fully coupled numerical model of the dewetting process that reproduces the key features observed in experiments. Moreover, we performed contact mechanics simulations to characterize the deformation of the elastomer and the shape of the dewetted area in a unit cell of the micropillar array.
Y1  - 2020
UN  - https://nbn-resolving.org/urn:nbn:de:bsz:291:415-3081
SN  - 0743-7463
SS  - 0743-7463
U6  - https://doi.org/10.1021/acs.langmuir.0c02005
DO  - https://doi.org/10.1021/acs.langmuir.0c02005
VL  - 36
IS  - 40
SP  - 11929
EP  - 11937
PB  - American Chemical Society
ER  -