Navigation Links
University of Pennsylvania engineers reveal what makes diamonds slippery at the nanoscale
Date:6/23/2008

PHILADELPHIA - They call diamonds "ice," and not just because they sparkle. Engineers and physicists have long studied diamond because even though the material is as hard as an ice ball to the head, diamond slips and slides with remarkably low friction, making it an ideal material or coating for seals, high performance tools and high-tech moving parts.

Robert Carpick, associate professor in the Department of Mechanical Engineering and Applied Mechanics at the University of Pennsylvania, and his group led a collaboration with researchers from Argonne National Laboratories, the University of Wisconsin-Madison and the University of Florida to determine what makes diamond films such slippery customers, settling a debate on the scientific origin of its properties and providing new knowledge that will help create the next generation of super low friction materials.

The Penn experiments, the first study of diamond friction convincingly supported by spectroscopy, looked at two of the main hypotheses posited for years as to why diamonds demonstrate such low friction and wear properties. Using a highly specialized technique know as photoelectron emission microscopy, or PEEM, the study reveals that this slippery behavior comes from passivation of atomic bonds at the diamond surface that were broken during sliding and not from the diamond turning into its more stable form, graphite. The bonds are passivated by dissociative adsorption of water molecules from the surrounding environment. The researchers also found that friction increases dramatically if there is not enough water vapor in the environment.

Some previous explanations for the source of diamond's super low friction and wear assumed that the friction between sliding diamond surfaces imparted energy to the material, converting diamond into graphite, itself a lubricating material. However, until this study no detailed spectroscopic tests had ever been performed to determine the legit
'/>"/>

Contact: Jordan Reese
jreese@upenn.edu
215-573-6604
University of Pennsylvania
Source:Eurekalert

Page: 1 2

Related biology technology :

1. GlaxoSmithKline Recognizes University of Michigans Dr. Daniel F. Hayes as the First Recipient of the Gianni Bonadonna Breast Cancer Award
2. BioMarin Licenses Technology From Leading Cystic Fibrosis Research Laboratory at the University of California, San Francisco
3. Microchip Biotechnologies, Inc. Secures Exclusive License to Use New University of Alberta Technology for Developing Microfluidic Devices
4. Alliance for Medical Devices, Instrumentation and Diagnostics formed between Fraunhofer Center for Manufacturing Innovation and Boston University
5. The University of Nottingham in the British Midlands Announces Development of Possible Hepatitis C Vaccine
6. University of Leicester scientists discover technique to help friendly bacteria
7. MichBio Announces Student Career Day at Michigan State University
8. Dr. Thomas Van Dyke Renowned Boston University Professor Joins Imagenetixs Medical Advisory Board
9. University HealthSystem Consortium Chooses SciQuest to Optimize Medical Research Procurement
10. Helix Biopharma announces addition of University of Arizona professor Kenneth Hatch as new medical advisor
11. McGill University Purchases GenVaults Personal Archive System to Manage Rare Cancer Samples
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/15/2014)... 2014  Bill Jacobs Automotive, a group of car dealerships headquartered ... the Heartland Blood Center and offering free oil change coupons ... place Saturday, Jan. 18 at the Bill Jacobs Cadillac and ... (Photo: http://photos.prnewswire.com/prnh/20140115/MN46637 )  The Bill Jacobs ...
(Date:1/15/2014)... California , January 15, 2014 Oxford ... today announced the appointment of Thomas C Reynolds MD, PhD ... years, development experience gained in the biotechnology industry, most recently ... am delighted to welcome Tom at this transformative time for ...
(Date:1/15/2014)... (PRWEB) January 15, 2014 Two champions ... continued their sponsorship of an annual competition for middle ... and access to, innovative STEM study. The competition presents ... TEAMS: Tests of Engineering Aptitude, Mathematics, and Sciences ...
(Date:1/15/2014)... AudioNotch is the internet's leading provider of Notched ... tinnitus. Patients listen to sound therapy that is tailor-made ... weeks to months, their tinnitus volume decreases. , AudioNotch has ... and Notched White Noise. Now, AudioNotch is pleased to announce ...
Breaking Biology Technology:Join the Bill Jacobs Auto blood drive and receive a free oil change 2Oxford BioTherapeutics Appoints Thomas C Reynolds MD, PhD to its Board of Directors 2Oxford BioTherapeutics Appoints Thomas C Reynolds MD, PhD to its Board of Directors 3Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 2Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 3Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 4Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 5
... cut 10,000 jobs Berbee ranks highly in Microsoft partner ... system Wausau police nab suspected wireless hacker ... , the parent company of SBC Wisconsin, will cut about 10,000 jobs ... the SEC. According to spokesperson Howard Riefs, SBC does not know how ...
... to a Web developer and used one of my favorite ... of items or choices, to clearly understand the meaning or ... context of my conversation with the developer, I said readers ... a particular Web interface. The words features, newsletters, and articles ...
... sides of the planet Uranus, as viewed in this composite ... Courtesy of Lawrence Sromovsky, UW-Madison Space Science and Engineering Center. ... Telescope , scientists have gained an unprecedented look at the ... most enigmatic weather in the solar system. , ,A pair ...
Cached Biology Technology:Tech Digest: whats moving in the Midwest (11/8/04) 2Simplicity beats complexity every time 2Simplicity beats complexity every time 3UW space scientists use Keck telescope to study wild weather of Uranus 2UW space scientists use Keck telescope to study wild weather of Uranus 3
(Date:4/18/2014)... feeding a world population predicted to reach 9 ... to conservation that considers human-altered landscapes such as ... the natural habitat that supports it might be ... at least three-quarters of the land surface is ... vulnerable to human-caused impacts such as climate change. ...
(Date:4/18/2014)... that sprout as soon as they,re planted may be good ... more careful. In the wild, a plant whose seeds sprouted ... disaster. More than just an insurance policy against late frosts ... has long-term advantages too: Plants whose seeds put off ... species, finds in a team of researchers working at the ...
(Date:4/17/2014)... densely forested and most densely populated quadrant of the ... values and practices. Disturbances associated with those needs, such ... have set the stage for management issues of considerable ... The report Five anthropogenic factors that will radically ... United States was published recently by the ...
Breaking Biology News(10 mins):Stanford researchers rethink 'natural' habitat for wildlife 2Stanford researchers rethink 'natural' habitat for wildlife 3Stanford researchers rethink 'natural' habitat for wildlife 4Plants with dormant seeds give rise to more species 2Five anthropogenic factors that will radically alter northern forests in 50 years 2Five anthropogenic factors that will radically alter northern forests in 50 years 3
... his theory, bacteria that are non-resistant to antibiotics acquire ... of others that are resistant, due to the stress ... researcher has formulated a new hypothesis concerning an enigma ... to solve and which could revolutionise the pharmaceutical industry: ...
... lucrative crops grow with a minimal amount of work and ... are ideal for bioenergy production come with a drawback ... of dollars in economic damage. Careful introduction of new ... critical, as is the evaluation of new or bioengineered plants ...
... dietary salt intake can induce a group of aggressive ... autoimmune diseases. This is the result of a study ... Yale University, New Haven and the Broad Institute of ... USA), PD Dr. Ralf Linker (Dept. of Neurology, University ...
Cached Biology News:New hypothesis: Why bacteria are becoming increasingly more resistant to antibiotics 2Researchers propose new solution to ensure biofuel plants don't become noxious weeds 2Researchers propose new solution to ensure biofuel plants don't become noxious weeds 3International study: Excess dietary salt may drive the development of autoimmune diseases 2International study: Excess dietary salt may drive the development of autoimmune diseases 3
anti-dansyl, rabbit IgG fraction *1 mg/mL* Secondary Detection; Anti-Dye and Anti-Hapten Antibodies...
MOUSE ANTI RAT RT1Ac Immunogen: PHA activated rat lymphocytes...
Prepared in 0.85% saline....
TACS Apoptotic DNA Laddering Kits are used to assay cells and tissues for apoptosis by...
Biology Products: