NDLI: Rate-dependent frictional adhesion in natural and synthetic gecko setae

Content Provider	PubMed Central
Author	Nick, Gravish Wilkinson, Matt Sponberg, Simon Parness, Aaron Esparza, Noe Soto, Daniel Yamaguchi, Tetsuo Michael, Broide Cutkosky, Mark Creton, Costantino Autumn, Kellar
Copyright Year	2010
Abstract	Geckos owe their remarkable stickiness to millions of dry, hard setae on their toes. In this study, we discovered that gecko setae stick more strongly the faster they slide, and do not wear out after 30 000 cycles. This is surprising because friction between dry, hard, macroscopic materials typically decreases at the onset of sliding, and as velocity increases, friction continues to decrease because of a reduction in the number of interfacial contacts, due in part to wear. Gecko setae did not exhibit the decrease in adhesion or friction characteristic of a transition from static to kinetic contact mechanics. Instead, friction and adhesion forces increased at the onset of sliding and continued to increase with shear speed from 500 nm s−1 to 158 mm s−1. To explain how apparently fluid-like, wear-free dynamic friction and adhesion occur macroscopically in a dry, hard solid, we proposed a model based on a population of nanoscopic stick–slip events. In the model, contact elements are either in static contact or in the process of slipping to a new static contact. If stick–slip events are uncorrelated, the model further predicted that contact forces should increase to a critical velocity (V) and then decrease at velocities greater than V. We hypothesized that, like natural gecko setae, but unlike any conventional adhesive, gecko-like synthetic adhesives (GSAs) could adhere while sliding. To test the generality of our results and the validity of our model, we fabricated a GSA using a hard silicone polymer. While sliding, the GSA exhibited steady-state adhesion and velocity dependence similar to that of gecko setae. Observations at the interface indicated that macroscopically smooth sliding of the GSA emerged from randomly occurring stick–slip events in the population of flexible fibrils, confirming our model predictions.
Related Links	http://dx.doi.org/10.1098/rsif.2009.0133
Ending Page	269
Page Count	11
Starting Page	259
File Format	PDF
ISSN	17425689
e-ISSN	17425662
Journal	Journal of the Royal Society Interface
Issue Number	43
Volume Number	7
Language	English
Publisher	The Royal Society
Publisher Date	2010-02-06
Access Restriction	Open
Rights Holder	The Royal Society
Subject Keyword	Biotechnology Biophysics Biochemistry Bioengineering Biomaterials Biomedical Engineering Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Biochemistry Biomaterials Biophysics Bioengineering Biomedical Engineering Biotechnology

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Rate-dependent frictional adhesion in natural and synthetic gecko setae

Orientation angle and the adhesion of single gecko setae

Dynamic self-cleaning in gecko setae via digital hyperextension

Macroscale adhesion of gecko setae reflects nanoscale differences in subsurface composition

Characterization of the structure and composition of gecko adhesive setae

Dynamic self-cleaning in gecko setae via digital hyperextension

Orientation angle and the adhesion of single gecko setae

Frictional and elastic energy in gecko adhesive detachment

Frictional and elastic energy in gecko adhesive detachment

Rate-dependent frictional adhesion in natural and synthetic gecko setae

Similar Documents

Rate-dependent frictional adhesion in natural and synthetic gecko setae

Orientation angle and the adhesion of single gecko setae

Dynamic self-cleaning in gecko setae via digital hyperextension

Macroscale adhesion of gecko setae reflects nanoscale differences in subsurface composition

Characterization of the structure and composition of gecko adhesive setae

Dynamic self-cleaning in gecko setae via digital hyperextension

Orientation angle and the adhesion of single gecko setae

Frictional and elastic energy in gecko adhesive detachment

Frictional and elastic energy in gecko adhesive detachment

Rate-dependent frictional adhesion in natural and synthetic gecko setae