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Wet but non slippery: Bioinspired adhesives that work in humid and flooded conditions

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Member of the SPP1420 from 2009 till 2015

Abstract

Tree and torrent frogs are able to adhere and climb in wet or even flooded environments without falling. The secret of their remarkable abilities is still not fully understood, but depends on both adhesion and friction, toepads with a complex hierarchical structure, particular material properties, and a fluid joint. During the last 16 months, we have made significant advances both in our understanding of the biological system and in our ability to transfer many of these properties to artificial anologues. For the second funding period we we want to take into account additional design factors (i.e. mucus, actuated micro/nanostructures) and investigate additional properties (reversibility of adhesion, adaptation to rough surfaces) of the adhesive system, including the dynamic variation of them during the attachment/detachment process. This study expands the number of structures and functional levels that nature combines for optimizing performance.

We will analyze the fluid secretion (chemical composition and rheological properties) as an additional design factor influencing attachment and detachment forces. We complement macroscopic measurements of adhesion and friction with sophisticated techniques for microscopic, in-situ tracking of the fluid flow through the channel structure, and determination of fluid layer thickness and distribution across the interface. Force and optical information will be time-resolved and simultaneously acquired on artificial surfaces and living animals. These experiments will help us to identify strategies (geometry and chemistry based) for reversible wet adhesion (e.g. actuated surface patterns or active mechanisms for controlling the volume, thickness or composition of the fluid layer) and adaptation to rough surfaces. Inspired by these results, responsive polymeric mimics will be fabricated and investigated.

 

Publications

Peer-Reviewed Publications

  • Barnes, W.J.P., Perez Goodwyn, P.J., Nokhbatolfoghahai, M., Gorb, S.N. Elastic modulus of tree frog adhesive toe pads. Journal of Comparative Physiology A, 2011. DOI 10.1007/s00359-011-0658-1.
  • Butt, H.-J., Barnes, W.J.P., del Campo, A., Kappl, M., Schönfeld, F., Capillary forces between soft, elastic spheres. Soft Matter, 23, 5930 (2010)
  • Butt, H.-J.; Barnes, W. J. P.; del Campo, A.; Kappl, M.; Schoenfeld, F. Capillary forces between soft, elastic spheres. Soft Matter 2010, 6 (23), 5930-5936.
  • Barnes, W.J.P.; Perez Goodwyn, P.J.; Nokhbatolfoghahai, M.; Gorb, S.N. Elastic modulus of tree frog adhesive toe pads. Journal of Comparative Physiology A, 197, 969-978, 2011.
  • Crawford, N.; Endlein, T.; Barnes, W.J.P. Self-cleaning in tree frog toe pads: a mechanism for recovering from contamination without the need for grooming. Journal of Experimental Biology, 2012, 215: 3965-3972.
  • Z. Shafiq, J. Cui, L. Pastor-Pérez, V. San Miguel, R. A. Gropeanu, C. Serrano, A. del Campo, Bioinspired underwater bonding and debonding on demand, Angew. Chemie Int. Ed. 2012, 51, 4332–4335
  • J. Cui, D. M. Drotlef, I. Larraza, J. P. Fernández, L. Boesel, C. Ohm, M. Metzger, R. Zentel, A. del Campo, Bioinspired Actuated Adhesive Patterns of Liquid Crystalline Elastomers, Adv. Mater. 2012, 24, 4601–4604
  • Drotlef, D.-M.; Stepien, L.; Kappl, M.; Barnes, W. J. P.; Butt, H.-J.; del Campo, A. Insights into the Adhesive Mechanisms of Tree Frogs using Artificial Mimics. Advanced Functional Materials 2013, 23 (9), 1137-1146.
  • Endlein, T.; Ji, A.; Samuel, D.; Yao, N.; Wang, Z.; Barnes, W. J. P.; Federle, W.; Kappl, M.; Dai, Z. Sticking like sticky tape: tree frogs use friction forces to enhance attachment on overhanging surfaces. Journal of the Royal Society Interface 2013, 10 (80), 1-11.
  • Barnes, W.J.P.; Baum, M.; Peisker, H.; Gorb, S.N.  Comparative cryo-SEM and AFM studies of hylid and rhacophorid tree frog toe pads, 2013. Journal of Morphology, 274, 1384-1396, 2013
  • Erath, J.; Cui, J.; Schmid, J.; Kappl, M.; del Campo, A.; Fery, A. Phototunable Surface Interactions. Langmuir 2013, 29 (39), 12138-12144.
  • Iturri, J.; Xue, L.; Kappl, M.; Garcia-Fernandez, L.; Barnes, W. J. P.; Butt, H.-J.; del Campo, A. Torrent Frog-Inspired Adhesives: Attachment to Flooded Surfaces. Advanced Functional Materials 2015, 25 (10), 1499-1505.
  • Xue, L.; Iturri, J.; Kappl, M.; Butt, H.-J.; del Campo, A. Bioinspired Orientation-Dependent Friction. Langmuir 2014, 30 (37), 11175-11182.
  • Endlein, T.; Barnes, W.J.P.; Samuel. D.; Crawford, N.; Biaw, A.E.; Grafe, U. Sticking under wet conditions: the remarkable attachment abilities of the torrent frog, Staurois guttatus, 2013. PLoS ONE, 8(9): e73810.
  • D.M. Drotlef, P. Blümler, A. del Campo , Magnetically Actuated Patterns for bioinspired reversible adhesion, Advanced Materials 2014, 26, 775-779
  • Drotlef, D.M., Appel, E., Peisker, H., Dening, K., del Campo, A., Gorb, S.N. and Barnes, W.J.P. Morphological studies of the toe pads of the rock frog, Staurois parvus, (family Ranidae) and their relevance to the development of new biomimetically inspired reversible adhesives.  Interface Focus, 20140036, 2015.

 

Proceedings and Book Chapters

  • Barnes, WJP Adhesion in wet environments - frogs. In: Bhushan, B. (Ed.) Encyclopedia of Nanotechnology. Springer Verlag. In press.


Conference Contributions

  • W. J. P Barnes, Society for Experimental Biology Annual Main Meeting, Prague, Czech Republic, July 2010. “What can single pad forces tell us about how tree frogs adhere”
  • W. J. P Barnes, Society for Experimental Biology Annual Main Meeting, Prague, Czech Republic, July 2010. “Rubber-like friction in tree frog feet”
  • T. Endlein, COST TD0906 Biological adhesives: from biology to biomimetics, Vienna, Austria. November 2010. “Attachment strategies of tree and torrent frogs”
  • Jon Barnes, COST TD0906 Biological adhesives: from biology to biomimetics, Vienna, Austria. November 2010. “Tree frog adhesion research at the University of Glasgow”
  • Jon Barnes, COST TD0906 Biological and biomimetic adhesives, Mons, Belgium. May 2011. "Wet but not slippery: bioinspired adhesives that work in humid and flooded conditions"
  • Niall Crawford, COST TD0906 Biological and biomimetic adhesives, Mons, Belgium. May 2011. "The self-cleaning properties of the toe pads of tree frogs"
  • Diana Samuel, COST TD0906 Biological and biomimetic adhesives, Mons, Belgium. May 2011. Biomechanics of adhesion in tree and torrent frogs"
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