Biomimicry News
Recent News |  Archives |  Tags |  About |  Newsletter |  Submit News |  Links |  Subscribe to BiomimicryNews.com RSS Feed Subscribe


More Articles
The electric slide dance of DNA knotsThe electric slide dance of DNA knots

Size and age of plants impact their productivity more than climate, study showsSize and age of plants impact their productivity more than climate, study shows

The development of blood-retinal barrier during astrocyte/vascular wall cell interactionThe development of blood-retinal barrier during astrocyte/vascular wall cell interaction

Bacteria manipulate salt to build shelters to hibernateBacteria manipulate salt to build shelters to hibernate

It takes two to courtIt takes two to court

Magnets for fusion energy: A revolutionary manufacturing method developedMagnets for fusion energy: A revolutionary manufacturing method developed

Breakthrough laser experiment reveals liquid-like motion of atoms in an ultra-cold clusterBreakthrough laser experiment reveals liquid-like motion of atoms in an ultra-cold cluster

A crystal wedding in the nanocosmosA crystal wedding in the nanocosmos

Has Antarctic sea ice expansion been overestimated?Has Antarctic sea ice expansion been overestimated?

Enhanced instrument enables high-speed chemical imaging of tissuesEnhanced instrument enables high-speed chemical imaging of tissues

Lunar pits could shelter astronauts, reveal details of how 'man in the moon' formedLunar pits could shelter astronauts, reveal details of how 'man in the moon' formed

Mixed genes mix up the migrations of hybrid birdsMixed genes mix up the migrations of hybrid birds

New research: When it hurts to think we were made for each otherNew research: When it hurts to think we were made for each other

Law of physics governs airplane evolutionLaw of physics governs airplane evolution

The economic territory of Upper Palaeolithic groups is specified by flintThe economic territory of Upper Palaeolithic groups is specified by flint

Running for life: How speed restricts evolutionary change of the vertebral columnRunning for life: How speed restricts evolutionary change of the vertebral column

Brain waves show learning to read does not end in 4th grade, contrary to popular theory

Getting a grip on robotic graspGetting a grip on robotic grasp

The bend in the Appalachian mountain chain is finally explainedThe bend in the Appalachian mountain chain is finally explained

Cooperation among humans, a question of ageCooperation among humans, a question of age

Protein's 'hands' enable bacteria to establish infection, research findsProtein's 'hands' enable bacteria to establish infection, research finds

Less exercise, not more calories, responsible for expanding waistlinesLess exercise, not more calories, responsible for expanding waistlines

High earners in a stock market game have brain patterns that can predict market bubblesHigh earners in a stock market game have brain patterns that can predict market bubbles

A healthy lifestyle adds years to lifeA healthy lifestyle adds years to life

Platonic solids generate their 4-dimensional analoguesPlatonic solids generate their 4-dimensional analogues

Do probiotics help kids with stomach bugs?Do probiotics help kids with stomach bugs?

Strict diet suspends development, doubles lifespan of wormsStrict diet suspends development, doubles lifespan of worms

Identified for the first time what kind of explosive has been used after the detonationIdentified for the first time what kind of explosive has been used after the detonation

Copied from nature: Detecting software errors via genetic algorithmsCopied from nature: Detecting software errors via genetic algorithms

Gecko-inspired adhesion: Self-cleaning and reliable (2/25/2014)

Tags:
drag, fibers, friction, gecko, glass, materials
This shows microhairs similar to the gecko's setae before and after cleaning through lateral friction contact with a smooth surface. -  Photograph with scanning electron microscope: Michael Röhrig, KIT
This shows microhairs similar to the gecko's setae before and after cleaning through lateral friction contact with a smooth surface. - Photograph with scanning electron microscope: Michael Röhrig, KIT

Geckos outclass adhesive tapes in one respect: Even after repeated contact with dirt and dust do their feet perfectly adhere to smooth surfaces. Researchers of the KIT and the Carnegie Mellon University, Pittsburgh, have now developed the first adhesive tape that does not only adhere to a surface as reliably as the toes of a gecko, but also possesses similar self-cleaning properties. Using such a tape, food packagings or bandages might be opened and closed several times. The results are published in the "Interface" journal of the British Royal Society. DOI: rsif.2013.1205

When moving forwards, the gecko's toes drag across a part of the surface. As a result of this lateral friction contact, larger dirt particles are removed. Smaller particles deposit among the setae on the sole and in the skinfolds below. In an experiment, the researchers have proved that both mechanisms provide for 95% of the self-cleaning effect. "This effect is determined by the ratio between particle size and setae diameter", Dr. Hendrik Hölscher of KIT's Institute of Microstructure Technology (IMT) says.

For their experiments, the scientists used elastic microhairs of variable size. Instead of dirt particles, they employed glass spheres of micrometer size (10-6 meters) and distributed them on a smooth plate. To simulate the steps made by a gecko, they pressed an artificial adhesive tape covered by microhairs onto the plate, shifted it laterally, and lifted the tape off again. This "load-drag-unload" cycle was repeated several times. In parallel, adhesive force was measured.

When the diameter of the spheres exceeded that of the microhairs, the adhesive force disappeared after the first contact ("load") - as in case of an ordinary adhesive tape. After eight to ten test cycles, however, the gecko-inspired adhesive tape reached 80 to 100 percent of its original power again. "In the long term, this effect might be used to develop a low-cost alternative to hook and loop fasteners," Hölscher says. "Such a tape might be applied in the sports sector, in medicine, automotive industry or aerospace technology," Metin Sitti, Professor of the Carnegie Mellon University, adds.

When the size of the spheres was smaller than the diameter of the microhairs, the researchers succeeded in restoring one third of the original adhesive force only. "For the perfect gecko-inspired adhesive tape, we therefore need fibers in the nanometer range (10-9 meters), which are smaller than most dirt particles", Dr. Michael Röhrig, IMT scientist, emphasizes. The skinfolds of the gecko have already been reproduced by wide grooves between narrow rows of hair. They offer enough space for the fine dust to deposit. Tests using real dirt particles of variable shape and size and particles made of various materials are planned to be carried out in the near future.

Note: This story has been adapted from a news release issued by the Helmholtz Association

Post Comments:

Search
New Articles
Squid sucker ring teeth material could aid reconstructive surgery, serve as eco-packaging

Study of animal urination could lead to better-engineered productsStudy of animal urination could lead to better-engineered products

Carbon-fiber epoxy honeycombs mimic the material performance of balsa woodCarbon-fiber epoxy honeycombs mimic the material performance of balsa wood

Collecting light with artificial moth eyesCollecting light with artificial moth eyes

Researchers use living systems as a guide to develop advanced technologiesResearchers use living systems as a guide to develop advanced technologies

Tiny muscles help bats fine-tune flight, stiffen wing skin

Nature inspires drones of the futureNature inspires drones of the future

Scientists study biomechanics behind amazing ant strengthScientists study biomechanics behind amazing ant strength

How octopuses don't tie themselves in knots revealedHow octopuses don't tie themselves in knots revealed

Spiders spin possible solution to 'sticky' problemsSpiders spin possible solution to 'sticky' problems

Using nature as a model for low-friction bearingsUsing nature as a model for low-friction bearings

Manmade artificial shark skin boosts swimming

Which has a more efficient 'engine': A tuna or a whale?

Mantis shrimp stronger than airplanesMantis shrimp stronger than airplanes

New material coating technology mimics nature's lotus effect



Archives
July 2014
June 2014
May 2014
April 2014
March 2014
February 2014
January 2014
December 2013
November 2013
October 2013
September 2013
August 2013
July 2013
June 2013
May 2013
April 2013
March 2013
February 2013
January 2013
December 2012
November 2012
October 2012
September 2012
August 2012
July 2012
June 2012
May 2012
March 2012
February 2012
January 2012
December 2011
November 2011
October 2011
September 2011
August 2011
July 2011
June 2011
May 2011
April 2011
March 2011
February 2011
January 2011
December 2010
November 2010
October 2010
September 2010
August 2010
July 2010
June 2010
May 2010
April 2010
March 2010
January 2010
December 2009
November 2009
October 2009
September 2009
August 2009
July 2009
June 2009
May 2009
April 2009
March 2009
February 2009
January 2009
December 2008
November 2008
October 2008
September 2008
August 2008
July 2008
May 2008
April 2008
March 2008
February 2008
January 2008
December 2007
November 2007
October 2007
September 2007
August 2007
July 2007
June 2007
October 2006


Science Friends
Agricultural Science
Astronomy News
Sports Tech
Biology News
Cognitive Research
Chemistry News
Tissue Engineering
Cancer Research
Cybernetics Research
Electonics Research
Forensics Report
Fossil News
Genetic Archaeology
Genetics News
Geology News
Microbiology Research
Nanotech News
Parenting News
Physics News


  Archives |  Submit News |  Advertise With Us |  Contact Us |  Links
Use of this site constitutes acceptance of our Terms of Service and Privacy Policy. All contents © 2000 - 2015 Web Doodle, LLC. All rights reserved.