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Observation of optimal gecko's adhesion on nanorough surfaces

Nicola M. Pugno, Emiliano Lepore
2008 Biosystems (Amsterdam. Print)  
In this letter we report experimental observations on the times of adhesion of living Tokay geckos (Gekko geckos) on polymethylmethacrylate (PMMA) inverted surfaces.  ...  The unexpected result is the observation of a maximal gecko adhesion on the surface with intermediate roughness of RMS = 618 nm, that we note has waviness comparable to the seta size.  ...  As a result, on PMMA 2 an adhesion increment, of about 45%, is observed.  ... 
doi:10.1016/j.biosystems.2008.06.009 pmid:18718501 fatcat:orjo7glarzbhloen2adzbwtz3m

Spiderman gloves

N PUGNO
2008 Nano Today  
New Adhesive Optimization Laws are derived and applied for increasing the capability of the scaling-up.  ...  Thus, although several insects and frogs rely on sticky fluids to adhere to surfaces, gecko and spider adhesion is fully dry.  ...  Lepore for the realization of the SEM pictures.  ... 
doi:10.1016/s1748-0132(08)70063-x fatcat:nmmrf3uslvhhjpexqkh7om3mqy

Multiscale effects and capillary interactions in functional biomimetic surfaces for energy conversion and green engineering

M. Nosonovsky, B. Bhushan
2009 Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences  
At the same time, an addition of a micro-/nanoscale hierarchical level, for example of surface roughness, can change qualitatively the properties of a system and introduce multiple equilibriums, instability  ...  Multiscale organization of the biomimetic surfaces and their adaptation to capillary effects make them suitable for applications using new principles of energy transition (e.g. capillary engines) and environment-friendly  ...  The attachment pads of a gecko's foot consist of a complicated hierarchy of structures beginning with lamellae, soft ridges approximately 1-2 mm in length located on the attachment pads (toes).  ... 
doi:10.1098/rsta.2009.0008 pmid:19324721 fatcat:wkpghhqxavaebmtgbjcshxgkbm

There's more than one way to climb a tree: Limb length and microhabitat use in lizards with toe pads

Travis J. Hagey, Scott Harte, Mathew Vickers, Luke J. Harmon, Lin Schwarzkopf, Sharon Swartz
2017 PLoS ONE  
Observation of optimal gecko's adhesion on nanorough surfaces. BioSystems. 2008; 94(3):218-22. https://doi.org/10.1016/j.biosystems.2008.06.009 PMID: 18718501 36.  ...  Repeated origin and loss of adhesive toepads in geckos. PLoS ONE. 2012; 7(6):e39429. https://doi.org/10.1371/journal.pone.0039429 PMID: 22761794 23. Ruibal R, Ernst V.  ...  Generating clinging forces on these surfaces would be difficult due to the bark of ironbark trees is very rough, with large valleys and ridges, greatly limiting the available surface area for adherence  ... 
doi:10.1371/journal.pone.0184641 pmid:28953920 pmcid:PMC5617165 fatcat:gcxqzulyejfedgddomrmsiuwfa

Direct Laser Interference Patterning: Tailoring of Contact Area for Frictional and Antibacterial Properties

Andreas Rosenkranz, Michael Hans, Carsten Gachot, Adrian Thome, Simon Bonk, Frank Mücklich
2016 Lubricants  
Topographic surface patterns on the micro-and nano-scale demonstrated a significant reduction in the coefficient of friction and bacterial adhesion.  ...  In this paper, direct laser interference patterning (DLIP) is presented as a promising tool allowing for the generation of such surface patterns on technical surfaces in order to mimic these biological  ...  Acknowledgments: The authors thank the work group of Karin Jacobs (Condensed Matter Physics) at the Saarland University and specifically Christian Kreis, as well as Christian Zeitz for excellent experimental  ... 
doi:10.3390/lubricants4010002 fatcat:zavwfwfm6zb67chyw7zddt2rwq

Tunable superapolar Lotus-to-Rose hierarchical nanosurfaces via vertical carbon nanotubes driven electrohydrodynamic lithography

Chiara Busà, Jonathan James Stanley Rickard, Eugene Chun, Yaw Chong, Viroshan Navaratnam, Pola Goldberg Oppenheimer
2017 Nanoscale  
The development of a robust, cost-effective, scalable and simple technique that enables the design and construction of well-controlled large area superhydrophobic surface structures which can be easily  ...  tuned from lotus-leaf to rose-petal state is essential to enable progress in realising the full applied potential of such surfaces.  ...  O. is a Royal Academy of Engineering Research (RAEng) Fellowship holder. We also thank the Cambridge University Botanic Garden for providing us with a fresh Nelumbo nucifera (lotus leaf ).  ... 
doi:10.1039/c6nr08706j pmid:28074956 pmcid:PMC5433428 fatcat:p33x2wfwanhx7j6sxz7vrq2oxe

Adhesive Materials [chapter]

An Experimental Study on Adhesive or Anti-adhesive, Bio-inspired Experimental Nanomaterials  
The analysis suggests the existence of a "weakest link" in the gecko's adhesion and is able to quantify its degree of brittleness for different surface roughness.  ...  We have considered two different geckos, male or female, adhering on different surfaces, glass or Poly(methyl meth-acrylate) (PMMA) with different roughness.  ...  Chapter 2 Chapter 2 The Gecko's Optimal Adhesion on Nanorough Surfaces Abstract In this study, we report experimental observations of adhesion times for living Tokay geckos on inverted Poly(methyl meth-acrylate  ... 
doi:10.2478/9788376560823.p1 fatcat:h6tsavsm6jfzzoukiawyzfsxya

An experimental study on adhesive or antiadhesiveand strong bio-inspired nanomaterials

Emiliano Lepore, N. Pugno
2012
An experimental study on adhesive or antiadhesive and strong bio-inspired nanomaterials Tesi per il conseguimento del titolo di Dottore di Ricerca XXIV Ciclo (A.A.  ...  Biasotto of the Department of Special Surgery of the University of Trieste for experimental instruments of surface measurements, and F.  ...  Boarino, INRIM Institute, for the fundamental help performing the SEM micrographs of C1 and C2 surfaces.  ... 
doi:10.6092/polito/porto/2498977 fatcat:tk6x6eis6fe3xjebbrhqwc4dc4

Graphene [chapter]

Yuehai Yang, Wenzhi Li, Elmar Kroner, Eduard Arzt, Bharat Bhushan, Laila Benameur, Liu Wei, Alain Botta, Yang Lu, Jun Lou, Debdeep Jena, Michael Nosonovsky (+5 others)
2012 Encyclopedia of Nanotechnology  
The results of their observation led them to the now refuted conclusion that the surface structure of the gecko toes provides high adhesion and friction due to mechanical interlocking on micro and nanorough  ...  Detachment is achieved by a peeling motion of the gecko's feet from a surface.  ...  Also neglected are the projection of the gravity field on the Oxy plane, out-of-plane Oz axis dynamics, and acceleration of the origin O.  ... 
doi:10.1007/978-90-481-9751-4_373 fatcat:ufbrwpdaingvdgjkgcybe3zlbi

Gecko Effect [chapter]

Bharat Bhushan
2016 Encyclopedia of Nanotechnology  
The results of their observation led them to the now refuted conclusion that the surface structure of the gecko toes provides high adhesion and friction due to mechanical interlocking on micro and nanorough  ...  Detachment is achieved by a peeling motion of the gecko's feet from a surface.  ...  and operational conditions on the scale factor of the sensor.  ... 
doi:10.1007/978-94-017-9780-1_378 fatcat:3lvzt6ie2rdsno4mgnvr7pum7u

New designs for bioinspired microstructures with adhesion to rough surfaces [article]

Sarah Christine Lidwina Fischer, Universität Des Saarlandes, Universität Des Saarlandes
2018
Nature is a vast source of inspiration as animals have mastered climbing on various surfaces at high speed with several attachment and detachment events in a short time.  ...  Adhesion to substrates with surface roughness is a research field with many unsolved questions.  ...  Acknowledgements The research for this thesis was conducted at the INM -Leibniz Institute for New Materials in the Functional Microstructures Group between 2014 and 2017 under the scientific guidance of  ... 
doi:10.22028/d291-27341 fatcat:6wav4mtdx5gjtpn3ixnt4rp5gq