期刊
JOURNAL OF THE ROYAL SOCIETY INTERFACE
卷 10, 期 87, 页码 -出版社
ROYAL SOC
DOI: 10.1098/rsif.2013.0620
关键词
biomimetics; attachment; fibrillar adhesives; pull-off force; surface topography
资金
- Technion V.P.R. Fund
- B. and G. Greenberg Research Fund (Ottawa)
- Center for Absorption in Science, Ministry of Immigrant Absorption, State of Israel
In this study, the effect of the substrate roughness on adhesion of mushroom-shaped microstructure was experimentally investigated. To do so, 12 substrates having different isotropic roughness were prepared from the same material by replicating topography of different surfaces. The pull-off forces generated by mushroom-shaped microstructure in contact with the tested substrates were measured and compared with the pull-off forces generated by a smooth reference. It was found that classical roughness parameters, such as average roughness (R-a) and others, cannot be used to explain topography-related variation in pull-off force. This has led us to the development of an integrated roughness parameter capable of explaining results of pull-off measurements. Using this parameter, we have also found that there is a critical roughness, above which neither smooth nor microstructured surface could generate any attachment force, which may have important implications on design of both adhesive and anti-adhesive surfaces.
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