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Delamination from an adhesive sphere: Curvature-induced dewetting versus buckling
Finn Box1,2, Lucie Domino1,3, Tiago Outerelo Corvo1
1Mathematical Institute, University of Oxford, Oxford OX2 6GG, UK.
Summary
Ultrathin adhesive films detach from curved surfaces due to buckling, not just surface energy. A new model explains this curvature-induced delamination, crucial for technologies like stretchable electronics.
Area of Science:
- Materials Science
- Solid Mechanics
- Adhesion Science
Background:
- Adhesive films often detach from curved surfaces, a common issue in industries like coatings and painting.
- Gauss' Theorema Egregium explains strain in flat sheets on curved surfaces, but previous models fail for ultrathin films.
Purpose of the Study:
- To develop a new model for curvature-induced delamination of ultrathin films.
- To understand the mechanics governing detachment on spheroidal regions of rigid substrates.
Main Methods:
- Combined mechanical and geometrical considerations to create a minimal model.
- Accounted for buckling motifs: shallow 'rucks' and localized 'folds'.
Main Results:
- The model accurately describes curvature-induced delamination of ultrathin films, unlike previous dewetting-like approaches.
- Predicted nontrivial scaling rules for delamination onset and pattern features, validated by experiments.
Conclusions:
- Ultrathin film delamination is driven by buckling under compression, not solely interfacial energy.
- The findings are vital for controlling ultrathin adhesives in advanced applications like stretchable electronics.
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