Featured Research

from universities, journals, and other organizations

Scientists discover the miracle of how geckos move, cling to ceilings

Date:
August 12, 2014
Source:
Oregon State University
Summary:
Researchers have developed a model that explains how geckos, as well as spiders and some insects, can run up and down walls, cling to ceilings, and seemingly defy gravity with such effortless grace.

Researchers at Oregon State University have developed a model that explains how geckos, as well as spiders and some insects, can run up and down walls, cling to ceilings, and seemingly defy gravity with such effortless grace.

This ability, outlined today in the Journal of Applied Physics, is a remarkable mechanism in the toes of geckos that uses tiny, branched hairs called "seta" that can instantly turn their stickiness on and off, and even "unstick" their feet without using any energy.

These extraordinary hairs contribute to the ability of geckos to run, evade predators, and protect their very lives and survival. In essence, a gecko never has a bad hair day.

"These are really fascinating nanoscale systems and forces at work," said Alex Greaney, an assistant professor in the OSU College of Engineering. "It's based not just on the nature of the seta but the canted angles and flexibility they have, and ability to work under a wide range of loading conditions."

Even more compelling, Greaney said, is the minimal amount of energy expended in the whole process, as a gecko can race across a ceiling with millions of little hairy contact points on its feet turning sticky and non-sticky in a precisely integrated process. This "smart" adhesion system allows them to run at 20 body-lengths per second and, hanging from a ceiling, the forces provided by the seta could actually support 50 times the body weight of the gecko.

In continued research the scientists want to find out more about this mechanism to recover stored energy, to see if more practical uses could be made of it -- better adhesives, for instance, or robots that can use some of these principles for improved performance or use in extreme environments.

The adhesion system used by geckos and insects has literally been studied for thousands of years, Greaney said, and it was only in 2000 that experts proved they are taking advantage of a concept in physics called van der Waals forces, a type of weak intermolecular force.

Geckos' feet are, by default, non-sticky, but the stickiness can be activated by a small shear force to produce this surprisingly tough form of adhesion.


Story Source:

The above story is based on materials provided by Oregon State University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Congcong Hu and P. Alex Greaney. Role of seta angle and flexibility in the gecko adhesion mechanism. Journal of Applied Physics, August 12, 2014 DOI: 10.1063/1.4892628

Cite This Page:

Oregon State University. "Scientists discover the miracle of how geckos move, cling to ceilings." ScienceDaily. ScienceDaily, 12 August 2014. <www.sciencedaily.com/releases/2014/08/140812122222.htm>.
Oregon State University. (2014, August 12). Scientists discover the miracle of how geckos move, cling to ceilings. ScienceDaily. Retrieved September 18, 2014 from www.sciencedaily.com/releases/2014/08/140812122222.htm
Oregon State University. "Scientists discover the miracle of how geckos move, cling to ceilings." ScienceDaily. www.sciencedaily.com/releases/2014/08/140812122222.htm (accessed September 18, 2014).

Share This



More Plants & Animals News

Thursday, September 18, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Elephant Undergoes Surgery in Tbilisi Zoo

Raw: Elephant Undergoes Surgery in Tbilisi Zoo

AP (Sep. 18, 2014) Grand the elephant has successfully undergone surgery to remove a portion of infected tusk at Tbilisi Zoo in Georgia. British veterinary surgeons used an electric drill to extract the infected piece. (Sept. 18) Video provided by AP
Powered by NewsLook.com
Chimp Violence Study Renews Debate On Why They Kill

Chimp Violence Study Renews Debate On Why They Kill

Newsy (Sep. 17, 2014) The study weighs in on a debate over whether chimps are naturally violent or become that way due to human interference in the environment. Video provided by Newsy
Powered by NewsLook.com
Some Tobacco Farmers Thrive Amid Challenges

Some Tobacco Farmers Thrive Amid Challenges

AP (Sep. 16, 2014) The South's tobacco country is surviving, and even thriving in some cases, as demand overseas keeps growers in the fields of one of America's oldest cash crops. (Sept. 16) Video provided by AP
Powered by NewsLook.com
Scientists Given Rare Glimpse of 350-Kilo Colossal Squid

Scientists Given Rare Glimpse of 350-Kilo Colossal Squid

AFP (Sep. 16, 2014) Scientists say a female colossal squid weighing an estimated 350 kilograms (770 lbs) and thought to be only the second intact specimen ever found was carrying eggs when discovered in the Antarctic. Duration: 00:47 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

More Coverage


Geckos Use Toe Hairs to Turn Stickiness on and Off

Aug. 12, 2014 If you've ever watched a gecko, you probably wondered about their uncanny ability to adhere to any surface -- including upside down. It turns out the little lizards can turn the ... read more
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins