Direct observation of microcavitation in underwater adhesion of mushroom-shaped adhesive microstructure
In this work we report on experiments aimed at testing the cavitation hypothesis [Varenberg, M.; Gorb, S. J. R. Soc., Interface 2008, 5, 383–385] proposed to explain the strong underwater adhesion of mushroom-shaped adhesive microstructures (MSAMSs). For this purpose, we measured the pull-off forces...
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| Format: | Article |
| Language: | English |
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Beilstein-Institut
2014-06-01
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| Series: | Beilstein Journal of Nanotechnology |
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| Online Access: | https://doi.org/10.3762/bjnano.5.103 |
| _version_ | 1819056473615892480 |
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| author | Lars Heepe Alexander E. Kovalev Stanislav N. Gorb |
| author_facet | Lars Heepe Alexander E. Kovalev Stanislav N. Gorb |
| author_sort | Lars Heepe |
| collection | DOAJ |
| description | In this work we report on experiments aimed at testing the cavitation hypothesis [Varenberg, M.; Gorb, S. J. R. Soc., Interface 2008, 5, 383–385] proposed to explain the strong underwater adhesion of mushroom-shaped adhesive microstructures (MSAMSs). For this purpose, we measured the pull-off forces of individual MSAMSs by detaching them from a glass substrate under different wetting conditions and simultaneously video recording the detachment behavior at very high temporal resolution (54,000–100,000 fps). Although microcavitation was observed during the detachment of individual MSAMSs, which was a consequence of water inclusions present at the glass–MSAMS contact interface subjected to negative pressure (tension), the pull-off forces were consistently lower, around 50%, of those measured under ambient conditions. This result supports the assumption that the recently observed strong underwater adhesion of MSAMS is due to an air layer between individual MSAMSs [Kizilkan, E.; Heepe, L.; Gorb, S. N. Underwater adhesion of mushroom-shaped adhesive microstructure: An air-entrapment effect. In Biological and biomimetic adhesives: Challenges and opportunities; Santos, R.; Aldred, N.; Gorb, S. N.; Flammang, P., Eds.; The Royal Society of Chemistry: Cambridge, U.K., 2013; pp 65–71] rather than by cavitation. These results obtained due to the high-speed visualisation of the contact behavior at nanoscale-confined interfaces allow for a microscopic understanding of the underwater adhesion of MSAMSs and may aid in further development of artificial adhesive microstructures for applications in predominantly liquid environments. |
| first_indexed | 2024-12-21T13:23:58Z |
| format | Article |
| id | doaj.art-d50b079d3e97430788de98c1ef492307 |
| institution | Directory Open Access Journal |
| issn | 2190-4286 |
| language | English |
| last_indexed | 2024-12-21T13:23:58Z |
| publishDate | 2014-06-01 |
| publisher | Beilstein-Institut |
| record_format | Article |
| series | Beilstein Journal of Nanotechnology |
| spelling | doaj.art-d50b079d3e97430788de98c1ef4923072022-12-21T19:02:30ZengBeilstein-InstitutBeilstein Journal of Nanotechnology2190-42862014-06-015190390910.3762/bjnano.5.1032190-4286-5-103Direct observation of microcavitation in underwater adhesion of mushroom-shaped adhesive microstructureLars Heepe0Alexander E. Kovalev1Stanislav N. Gorb2Functional Morphology and Biomechanics, Zoological Institute, Kiel University, Am Botanischen Garten 1-9, 24118 Kiel, GermanyFunctional Morphology and Biomechanics, Zoological Institute, Kiel University, Am Botanischen Garten 1-9, 24118 Kiel, GermanyFunctional Morphology and Biomechanics, Zoological Institute, Kiel University, Am Botanischen Garten 1-9, 24118 Kiel, GermanyIn this work we report on experiments aimed at testing the cavitation hypothesis [Varenberg, M.; Gorb, S. J. R. Soc., Interface 2008, 5, 383–385] proposed to explain the strong underwater adhesion of mushroom-shaped adhesive microstructures (MSAMSs). For this purpose, we measured the pull-off forces of individual MSAMSs by detaching them from a glass substrate under different wetting conditions and simultaneously video recording the detachment behavior at very high temporal resolution (54,000–100,000 fps). Although microcavitation was observed during the detachment of individual MSAMSs, which was a consequence of water inclusions present at the glass–MSAMS contact interface subjected to negative pressure (tension), the pull-off forces were consistently lower, around 50%, of those measured under ambient conditions. This result supports the assumption that the recently observed strong underwater adhesion of MSAMS is due to an air layer between individual MSAMSs [Kizilkan, E.; Heepe, L.; Gorb, S. N. Underwater adhesion of mushroom-shaped adhesive microstructure: An air-entrapment effect. In Biological and biomimetic adhesives: Challenges and opportunities; Santos, R.; Aldred, N.; Gorb, S. N.; Flammang, P., Eds.; The Royal Society of Chemistry: Cambridge, U.K., 2013; pp 65–71] rather than by cavitation. These results obtained due to the high-speed visualisation of the contact behavior at nanoscale-confined interfaces allow for a microscopic understanding of the underwater adhesion of MSAMSs and may aid in further development of artificial adhesive microstructures for applications in predominantly liquid environments.https://doi.org/10.3762/bjnano.5.103bio-inspiredbiomimeticcavitationcontact mechanicsgeckointerfacenegative pressurepull-offsurfacetribology |
| spellingShingle | Lars Heepe Alexander E. Kovalev Stanislav N. Gorb Direct observation of microcavitation in underwater adhesion of mushroom-shaped adhesive microstructure Beilstein Journal of Nanotechnology bio-inspired biomimetic cavitation contact mechanics gecko interface negative pressure pull-off surface tribology |
| title | Direct observation of microcavitation in underwater adhesion of mushroom-shaped adhesive microstructure |
| title_full | Direct observation of microcavitation in underwater adhesion of mushroom-shaped adhesive microstructure |
| title_fullStr | Direct observation of microcavitation in underwater adhesion of mushroom-shaped adhesive microstructure |
| title_full_unstemmed | Direct observation of microcavitation in underwater adhesion of mushroom-shaped adhesive microstructure |
| title_short | Direct observation of microcavitation in underwater adhesion of mushroom-shaped adhesive microstructure |
| title_sort | direct observation of microcavitation in underwater adhesion of mushroom shaped adhesive microstructure |
| topic | bio-inspired biomimetic cavitation contact mechanics gecko interface negative pressure pull-off surface tribology |
| url | https://doi.org/10.3762/bjnano.5.103 |
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