Toward Bioinspired Wet Adhesives: Lessons from Assessing Surface Structures of the Suction Disc of Intertidal Clingfish
- 7 October 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 12 (40), 45460-45475
- https://doi.org/10.1021/acsami.0c10749
Abstract
The clingfish attaches to rough surfaces with considerable strength using an intricate suction disc, which displays complex surface geometries from structures called papillae. However, the exact role of these structures in adhesion is poorly understood. To investigate the relationship between papillae geometry and adhesive performance, we developed an image processing tool that analyzed the surface and structural complexity of papillae, which we then used to model hydrodynamic adhesion. Our tool allowed for the automated analysis of thousands of papillae in specimens across a range of body sizes. The results led us to identify spatial trends in papillae across the complex geometry of the suction disc and to establish fundamental structurefunction relationships used in hydrodynamic adhesion. We found that the surface area of papillae changed within a suction disc and with fish size, but that the aspect ratios and channel width between papillae did not. Using a mathematical model, we found that the surface structures can adhere considerably when subjected to disturbances of moderate to high velocities. We concluded that a predominant role of the papillae is to leverage hydrodynamic adhesion and wet friction to reinforce the seal of the suction disc. Overall, the trends in papillae characteristics provided insights into bioinspired designs of surface microstructures for future applications in which adhesion is necessary to attach to diverse surfaces (in terrestrial or aquatic environments), even when subjected to disturbance forces of randomized directionality.Funding Information
- Air Force Office of Scientific Research (AFOSR-FA9550-17-1-0249)
- Office of Naval Research Global (N000141712062)
- Gates Millennium Scholars
This publication has 62 references indexed in Scilit:
- Tree frog adhesion biomimetics: opportunities for the development of new, smart adhesives that adhere under wet conditionsPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2019
- Tree frog attachment: mechanisms, challenges, and perspectivesFrontiers in Zoology, 2018
- Soft Robotic GrippersAdvanced Materials, 2018
- ADHESION TECHNOLOGIES OF BIO-INSPIRED CLIMBING ROBOTS: A SURVEYInternational Journal of Robotics and Automation, 2018
- Climbing with adhesion: from bioinspiration to biounderstandingInterface Focus, 2015
- Inspiration from the natural world: from bio-adhesives to bio-inspired adhesivesJournal of Adhesion Science and Technology, 2012
- Capillary forces between soft, elastic spheresSoft Matter, 2010
- Recent advances in the fabrication and adhesion testing of biomimetic dry adhesivesSmart Materials and Structures, 2010
- Functional demands of dynamic biological adhesion: an integrative approachJournal of Comparative Physiology B, 2008
- Biological attachment devices: exploring nature's diversity for biomimeticsPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2008