Navigation Links
Dry adhesive based on carbon nanotubes gets stronger, with directional gripping ability
Date:10/9/2008

of Engineering at the University of Dayton. "This directional difference in the adhesion force is a significant improvement that could help make this material useful as a transient adhesive."

The key to the new material is the use of rationally-designed multi-walled carbon nanotubes formed into arrays with "curly entangled tops," said Zhong Lin Wang, a Regents' Professor in the Georgia Tech School of Materials Science and Engineering. The tops, which Wang compared to spaghetti or a jungle of vines, mimic the hierarchical structure of real gecko feet, which include branching hairs of different diameters.

When pressed onto a vertical surface, the tangled portion of the nanotubes becomes aligned in contact with the surface. That dramatically increases the amount of contact between the nanotubes and the surface, maximizing the van der Waals forces that occur at the atomic scale. When lifted off the surface in a direction parallel to the main body of the nanotubes, only the tips remain in contact, minimizing the attraction forces, Wang explained.

"The contact surface area matters a lot," he noted. "When you have line contact along, you have van der Waals forces acting along the entire length of the nanotubes, but when you have a point contact, the van der Waals forces act only at the tip of the nanotubes. That allows us to truly mimic what the gecko does naturally."

In tests done on a variety of surfaces including glass, a polymer sheet, Teflon and even rough sandpaper the researchers measured adhesive forces of up 100 Newtons per square centimeter in the shear direction. In the normal direction, the adhesive forces were 10 Newtons per square centimeter about the same as a real gecko.

The resistance to shear increased with the length of the nanotubes, while the resistance to normal force was independent of tube length.

Though the material might seem most appropriate for use by Spider-Man, the real app
'/>"/>

Contact: John Toon
jtoon@gatech.edu
404-894-6986
Georgia Institute of Technology Research News
Source:Eurekalert  

Page: 1 2 3 4

Related biology technology :

1. Spherics, Inc. Announces Sale of Novel Proprietary Bioadhesive Polymers and Oral Drug Delivery System
2. Bluestar Silicones Presents Adhesive Gels for Wound Care at Medical Grade Polymers Conference
3. CryoLifes BioGlue(R) Surgical Adhesive Receives European Approval for use in Browlift Cosmetic and Reconstructive Plastic Surgery
4. New adhesive mimics gecko toe hairs
5. CryoLife Signs Distribution Agreement for Inclusion of BioGlue(R) Surgical Adhesive in Hernia Repair Kit with Proxy Biomedical Surgical Meshes
6. ThalesNano, Inc. Forms Collaborations with Leading US Universities based on the Award Winning H-Cube(R) and H-Cube Midi(TM)
7. New Opportunities in X-Ray Based Surgical Navigation With Ziehm NaviPort 3D
8. Quota-Based Compensation Plans Outpace Ranking Plans
9. MediCult Acquires US-Based MidAtlantic Diagnostics to Further Strengthen ART Presence
10. New graphene-based material clarifies graphite oxide chemistry
11. Nucletron Announces Market Release of First Commercially Available Software to Review and Share Dicom-Based Treatment Plans for Radiotherapy
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Dry adhesive based on carbon nanotubes gets stronger, with directional gripping ability
(Date:8/28/2014)... , Aug. 28, 2014   SunTrust Robinson ... three industry veterans to its equity research team ... "Our ongoing expansion in equity research demonstrates our ... unique insights to enhance their investment decision making," ... at STRH.  "We continue to make significant investments ...
(Date:8/28/2014)... 2014 Scientists, researchers, and technologists will ... Laser Damage 2014 symposium. Marking its 46th year, ... will run 14-17 September. The event is sponsored by ... . , The premier conference for basic and applied ... optical materials will engage researchers and engineers from numerous ...
(Date:8/28/2014)... Supplementing their complete line of ... Eppendorf Safe Lock Centrifuge Tubes . This ... quality tubes at an affordable price. Eppendorf Safe ... chemical, medical, pharmaceutical, and life science research and ... able to afford Eppendorf products. , Eppendorf is ...
(Date:8/27/2014)... Aug. 27, 2014 Rhythm, a biopharmaceutical company ... deficiencies that result in metabolic disorders, announced today that ... with the U.S. Securities and Exchange Commission (SEC) relating ... its common stock. The number of shares to be ... not yet been determined. Citigroup and Cowen ...
Breaking Biology Technology:SunTrust Robinson Humphrey Expands Equity Research in Healthcare and Energy 2SunTrust Robinson Humphrey Expands Equity Research in Healthcare and Energy 3Laser Damage to Draw Researchers, Engineers, Scientists to 46th Annual Conference 2Laser Damage to Draw Researchers, Engineers, Scientists to 46th Annual Conference 3Eppendorf Safe Lock Centrifuge Tube Promotion Now Available at Major Pipette Distributor Pipette.com 2Eppendorf Safe Lock Centrifuge Tube Promotion Now Available at Major Pipette Distributor Pipette.com 3Rhythm Files Registration Statement for Proposed Initial Public Offering 2
... striving to develop organic solar cells that can be produced ... used to generate electricity. But a major obstacle is ... at the nanoscale (tinier than 2-millionths of an inch) to ... is to develop cells made from low-cost plastics that will ...
... 4 Keryx Biopharmaceuticals, Inc. (Nasdaq: KERX ) will hold ... to discuss the second quarter 2009 financial results and business outlook for ... Company, will host the call. Keryx will announce its financial results ... the call. , , In order to participate in ...
... Nile Therapeutics, Inc. (Nasdaq: NLTX ), a company ... today announced dosing of its first patient in a Phase 2 ... acute heart failure. , , The single-blind, placebo-controlled ... safety and tolerability of CD-NP when infused for up to 72 ...
Cached Biology Technology:Plastics that convert light to electricity could have a big impact 2Plastics that convert light to electricity could have a big impact 3Keryx Biopharmaceuticals, Inc. to Hold Conference Call on Second Quarter 2009 Financial Results on Thursday, August 6, 2009 at 8:30am EDT 2Nile Therapeutics, Inc. Announces Dosing of First Patient in Phase 2 Study of CD-NP for the Treatment of Acute Heart Failure 2Nile Therapeutics, Inc. Announces Dosing of First Patient in Phase 2 Study of CD-NP for the Treatment of Acute Heart Failure 3
(Date:8/27/2014)... that a single fungal cell or bacterial colony exerts on ... a heavy role in setting up some of the most ... be too much of a stretch to say that plants ... respond to the touch of beneficial fungi, according to a ... at the University of Wisconsin-Madison. , "Many people have ...
(Date:8/27/2014)... mysteries of the human genome was unveiled today in ... detailed comparison yet of how the genomes of the ... research, appearing August 28 in in the journal ... three species, genomes is "read out," and how their ... results add billions of entries to a publicly available ...
(Date:8/27/2014)... a gene that could help scientists engineer drought-resistant crops. ... cell membrane of plants that senses changes in water ... , "It,s similar to a thermostat," said Zhen-Ming ... , The findings, which appear Aug. 28 in the ... feed the world,s growing population in the face of ...
Breaking Biology News(10 mins):A touching story: The ancient conversation between plants, fungi and bacteria 2A touching story: The ancient conversation between plants, fungi and bacteria 3Encyclopedia of how genomes function gets much bigger 2Encyclopedia of how genomes function gets much bigger 3Encyclopedia of how genomes function gets much bigger 4Water 'thermostat' could help engineer drought-resistant crops 2
... -- In the summer of 1968, a new strain of ... spread around the globe and eventually killed an estimated 1 ... there are many strains of H3N2 circulating in birds and ... have the potential to generate a pandemic if they leap ...
... from the David Geffen School of Medicine at UCLA have ... of Sciences in recognition of their distinguished and continuing achievements ... is considered one of the highest honors presented to scientists ... Thomas Edison, Orville Wright and Alexander Graham Bell. ...
... a new door to developing drugs to slow the ... Edward A. Fon at the Montreal Neurological Institute and ... in the Department of Biochemistry at the Faculty of ... Parkin. Mutations in Parkin cause a rare hereditary form ...
Cached Biology News:Potential flu pandemic lurks 2Potential flu pandemic lurks 32 UCLA faculty elected to National Academy of Sciences 2Unleashing the watchdog protein 2
... The Varian 500-MS LC Ion Trap ... high-throughput LC/MS analysis where sensitivity, reliability ... 500-MS provides a robust platform for ... mass resolution, and mass stability reflect ...
... General description: The Costar strip ejector ... easy removal of Costar strips from their ... new product number, created to easily match ... yet, please order under the old Sigma-Aldrich ...
Sigmas E-TOXATE (Limulus Amebocyte Lysate) test kits are intended for the detection and semiquantitation,of endotoxins for research purposes....
... These versatile enclosures ... with nitrogen or other ... a low-humidity environment. HEPA ... and ionization modules also ...
Biology Products: