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


More Articles
Improvements in fuel cell designImprovements in fuel cell design

Rediscovering Venus to find faraway earthsRediscovering Venus to find faraway earths

Archaeologists discover bronze remains of Iron Age chariotArchaeologists discover bronze remains of Iron Age chariot

Researchers resolve the Karakoram glacier anomaly, a cold case of climate scienceResearchers resolve the Karakoram glacier anomaly, a cold case of climate science

Fish tale: New study evaluates antibiotic content in farm-raised fishFish tale: New study evaluates antibiotic content in farm-raised fish

New 3-D display technology promises greater energy efficiencyNew 3-D display technology promises greater energy efficiency

Researchers break nano barrier to engineer the first protein microfiberResearchers break nano barrier to engineer the first protein microfiber

Magnetic mirrors enable new technologies by reflecting light in uncanny waysMagnetic mirrors enable new technologies by reflecting light in uncanny ways

Structure of an iron-transport protein revealedStructure of an iron-transport protein revealed

First step: From human cells to tissue-engineered esophagusFirst step: From human cells to tissue-engineered esophagus

Lift weights, improve your memoryLift weights, improve your memory

Spiders: Survival of the fittest groupSpiders: Survival of the fittest group

Autophagy helps fast track stem cell activationAutophagy helps fast track stem cell activation

Myelin vital for learning new practical skillsMyelin vital for learning new practical skills

More physical activity improved school performanceMore physical activity improved school performance

Around the world in 400,000 years: The journey of the red foxAround the world in 400,000 years: The journey of the red fox

Engineering new vehicle powertrainsEngineering new vehicle powertrains

Active aging is much more than exerciseActive aging is much more than exercise

Study: New device can slow, reverse heart failureStudy: New device can slow, reverse heart failure

Are the world's religions ready for ET?Are the world's religions ready for ET?

Gut bacteria, artificial sweeteners and glucose intoleranceGut bacteria, artificial sweeteners and glucose intolerance

Recreating the stripe patterns found in animals by engineering synthetic gene networksRecreating the stripe patterns found in animals by engineering synthetic gene networks

Laying the groundwork for data-driven scienceLaying the groundwork for data-driven science

Hold on, tiger momHold on, tiger mom

Missing piece found to help solve concussion puzzleMissing piece found to help solve concussion puzzle

Biologists delay the aging process by 'remote control'Biologists delay the aging process by 'remote control'

Geography matters: Model predicts how local 'shocks' influence U.S. economyGeography matters: Model predicts how local 'shocks' influence U.S. economy

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
Bio-inspired bleeding controlBio-inspired bleeding control

Longhorn beetle inspires ink to fight counterfeiting

Bioinspired coating for medical devices repels blood and bacteria

Bioinspired materials enable new health-care optionsBioinspired materials enable new health-care options

Shorebird's beak inspires research on water collectionShorebird's beak inspires research on water collection

Nature's designs inspire research into new light-based technologiesNature's designs inspire research into new light-based technologies

Artificial 'beaks' that collect water from fog: A drought solution?

'Squid skin' metamaterials project yields vivid color display

Pesky insect inspires practical technologyPesky insect inspires practical technology

A semi-artificial leaf faster than 'natural' photosynthesisA semi-artificial leaf faster than 'natural' photosynthesis

Engineering long-lasting joint lubrication by mimicking nature

Researchers inspired by marine life to design camouflage systems

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

How spiders spin silk

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



Archives
November 2014
October 2014
September 2014
August 2014
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.