Navigation Links
'Heftier' atoms reduce friction at the nanoscale, study led by Penn researcher reveals
Date:11/1/2007

PHILADELPHIA - A research team led by a University of Pennsylvania mechanical engineer has discovered that friction between two sliding bodies can be reduced at the molecular, or nanoscale, level by changing the mass of the atoms at the surface. Heavier atoms vibrate at a lower frequency, reducing energy lost during sliding.

The study appears in the November issue of the journal Science.

Penn researchers, along with colleagues at the University of Houston and the University of Wisconsin now at IBMs Zurich Research Laboratory and the Argonne National Laboratory, used atomic force microscopy like an old-fashioned record needle, sliding it along single-crystal diamond and silicon surfaces to measure the force of friction. Before doing so, researchers coated each crystal surface with one of two adsorbates designed to best exhibit variations in the mass of the atoms at the surface without changing the chemistry. The first adsorbate was a single layer of hydrogen atoms. The second was its chemically similar but heavier cousin, deuterium, a hydrogen atom with a neutron stuffed inside its nucleus.

Our study found that the larger mass of the terminating atoms at the surface, in this case deuterium, led to less energy lost to heat in the system, Robert Carpick, associate professor of mechanical engineering and applied mechanics at Penn, said. The larger atomic mass of deuterium results in a lower natural vibration frequency of the atoms. These atoms collide less frequently with the tip sliding over it, and thus energy is more slowly dissipated away from the contact.

The single layer of atoms at the surface of each crystal acts as an energy transfer medium, absorbing kinetic energy from the tip of the atomic force microscope. The tips were less than 50nm in radius at their ends. How much energy is absorbed is dependent, researchers found, on the adsorbates natural atomic vibration frequencies. The heavier an atom, the lower its vibrational freque
'/>"/>

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

Page: 1 2

Related biology news :

1. Male circumcision reduces risk of HIV transmission from women to men
2. Deficiency of growth hormone and IGF-1 reduces cancer and kidney disease, but creates other problems
3. Use of PET can reduce, may eliminate more strenuous drug development trials with animals
4. Solutions that reduce death of marine life reeled in by International Smart Gear Competition
5. Physiological effects of reduced gravity on bacteria
6. New strategies to reduce hospital-aquired infections
7. New miniaturised chip dramatically reduces time taken for DNA analysis
8. Scalpel-free surgery could reduce risk of HIV and hepatitis exposure for health care workers
9. Newly recognized gene mutation may reduce seeds, resurrect plants
10. New processing method reduces peanut allergenicity
11. Blocking the nerve receptor EP1 in mouse models reduces brain damage caused by stroke
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/23/2015)... Aware, Inc. (NASDAQ: AWRE ), a leading ... for its second quarter ended June 30, 2015.  ... million, a decrease of 33% compared to $6.8 million in ... quarter of 2015 was $0.3 million, or $0.01 per diluted ... share, in the same period a year ago.  ...
(Date:7/21/2015)... , July 21, 2015  NXT-ID, Inc. ... a biometric authentication company focused on the growing ... smart wallet, announces that it has filed provisional ... and Method. This invention highlights ... only authorizes an account, but also the user ...
(Date:7/13/2015)... , July 13, 2015 Synaptics Inc. ... human interface solutions, today announced sampling of ClearPad ... display driver integration (TDDI) product targeting smartphones and ... to combine Synaptics , best-in-class touch controller ... driver technology developed in the company,s Japan Design ...
Breaking Biology News(10 mins):Aware, Inc. Reports Second Quarter 2015 Financial Results 2Aware, Inc. Reports Second Quarter 2015 Financial Results 3Aware, Inc. Reports Second Quarter 2015 Financial Results 4Aware, Inc. Reports Second Quarter 2015 Financial Results 5Aware, Inc. Reports Second Quarter 2015 Financial Results 6NXT-ID Patents Personalized Tokenized Payments for Next Generation Secure Payment Technology 2NXT-ID Patents Personalized Tokenized Payments for Next Generation Secure Payment Technology 3NXT-ID Patents Personalized Tokenized Payments for Next Generation Secure Payment Technology 4Synaptics Announces Sampling of Second Generation TDDI Solutions 2Synaptics Announces Sampling of Second Generation TDDI Solutions 3
... October 2011 A young scientist who led research into the ... surface disease has been named the winner of the Young Investigator ... will be presented with her award at The Stem Cell Symposium, ... 2011. The $10,000 prize is awarded annually to a young scientist ...
... primary producers of ammonia in Houston,s atmosphere, and cars and ... to a new study by researchers at Rice University and ... quality draws minimal oversight from the Environmental Protection Agency (EPA), ... means to life in and around the metropolis. ...
... microscopical water channels are also present in the cells ... transported through the protective surface of the cell. Scientists at ... of the body,s water channels can be modified such that ... the treatment of several diseases. "It,s important to understand ...
Cached Biology News:Regenerating eyes using cells from hair: Stem Cells awards research into stem cell deficiency 2Ammonia gets overdue overview 2Ammonia gets overdue overview 3Water channels in the body help cells remain in balance 2
(Date:7/30/2015)... -- AACC welcomed thousands of medical professionals and ... & Clinical Lab Expo in Atlanta ... revolutionary advancements in clinical testing technology and research ... diagnose patients quickly and accurately and make sure ... As of Wednesday, July 29, more than 17,500 ...
(Date:7/30/2015)... ... July 30, 2015 , ... ... a field clinical study of its canine osteoarthritis stem cell product, currently under ... (Kansas City, KS) and will be marketed in the US by Aratana. This ...
(Date:7/30/2015)... 30, 2015 HIGHLIGHTS:Q2 2015 Results ... , Reported sales were $697 million compared to ... grew organically by 8%, and changes in foreign currency ... sales by 1%. , By business unit, organic ... and 11% in SAFC Commercial. , Reported diluted ...
(Date:7/29/2015)... , July 30, 2015 ... la santé, publie ses résultats pour le premier ... commente les résultats. Visionner l,interview ... http://www.eurobusinessmedia.com/ceo-direct/sanofi/sanofi-h1-2015-results-interview-with-ceo-olivier-brandicourt?utm_source=ceo-direct&utm_medium=wire Au sommaire de ... - Moteurs de croissance - ...
Breaking Biology Technology:Innovative Research on Cancer, Heart Disease, and Infectious Diseases Draws More than 17,500 Attendees to 2015 AACC Annual Meeting 2Innovative Research on Cancer, Heart Disease, and Infectious Diseases Draws More than 17,500 Attendees to 2015 AACC Annual Meeting 3Innovative Research on Cancer, Heart Disease, and Infectious Diseases Draws More than 17,500 Attendees to 2015 AACC Annual Meeting 4VetStem Biopharma Successfully Completes Large Milestone Efficacy Study for its Flagship Canine Osteoarthritis Stem Cell Product 2VetStem Biopharma Successfully Completes Large Milestone Efficacy Study for its Flagship Canine Osteoarthritis Stem Cell Product 3Sigma-Aldrich (NASDAQ - SIAL) Reports Q2 2015 Sales Of $697 Million And Adjusted Diluted EPS Of $1.01 2Sigma-Aldrich (NASDAQ - SIAL) Reports Q2 2015 Sales Of $697 Million And Adjusted Diluted EPS Of $1.01 3Sigma-Aldrich (NASDAQ - SIAL) Reports Q2 2015 Sales Of $697 Million And Adjusted Diluted EPS Of $1.01 4Sigma-Aldrich (NASDAQ - SIAL) Reports Q2 2015 Sales Of $697 Million And Adjusted Diluted EPS Of $1.01 5Sigma-Aldrich (NASDAQ - SIAL) Reports Q2 2015 Sales Of $697 Million And Adjusted Diluted EPS Of $1.01 6Sigma-Aldrich (NASDAQ - SIAL) Reports Q2 2015 Sales Of $697 Million And Adjusted Diluted EPS Of $1.01 7Sigma-Aldrich (NASDAQ - SIAL) Reports Q2 2015 Sales Of $697 Million And Adjusted Diluted EPS Of $1.01 8Sigma-Aldrich (NASDAQ - SIAL) Reports Q2 2015 Sales Of $697 Million And Adjusted Diluted EPS Of $1.01 9Sigma-Aldrich (NASDAQ - SIAL) Reports Q2 2015 Sales Of $697 Million And Adjusted Diluted EPS Of $1.01 10Sigma-Aldrich (NASDAQ - SIAL) Reports Q2 2015 Sales Of $697 Million And Adjusted Diluted EPS Of $1.01 11Sigma-Aldrich (NASDAQ - SIAL) Reports Q2 2015 Sales Of $697 Million And Adjusted Diluted EPS Of $1.01 12Sigma-Aldrich (NASDAQ - SIAL) Reports Q2 2015 Sales Of $697 Million And Adjusted Diluted EPS Of $1.01 13Sigma-Aldrich (NASDAQ - SIAL) Reports Q2 2015 Sales Of $697 Million And Adjusted Diluted EPS Of $1.01 14Sigma-Aldrich (NASDAQ - SIAL) Reports Q2 2015 Sales Of $697 Million And Adjusted Diluted EPS Of $1.01 15Sigma-Aldrich (NASDAQ - SIAL) Reports Q2 2015 Sales Of $697 Million And Adjusted Diluted EPS Of $1.01 16Sigma-Aldrich (NASDAQ - SIAL) Reports Q2 2015 Sales Of $697 Million And Adjusted Diluted EPS Of $1.01 17Sigma-Aldrich (NASDAQ - SIAL) Reports Q2 2015 Sales Of $697 Million And Adjusted Diluted EPS Of $1.01 18Sigma-Aldrich (NASDAQ - SIAL) Reports Q2 2015 Sales Of $697 Million And Adjusted Diluted EPS Of $1.01 19Sigma-Aldrich (NASDAQ - SIAL) Reports Q2 2015 Sales Of $697 Million And Adjusted Diluted EPS Of $1.01 20
... YORK, Sept. 10 In a major victory for ... technologies, Weil,Gotshal & Manges LLP won a summary judgment ... action, Enzo Biochem, Inc., had,claimed that Applera,s DNA sequencing ... a detailed 49-page Ruling, the Honorable Janet Bond Arterton ...
... Biomaxx Systems Inc. (Pink,Sheets: BMXSF), is pleased ... by,Southern Cross Agricultural Developments Pty. Ltd. ... respect to renewable bio-fuels,waste water management and ... Agricultural Developments is developing large vertical,integrated Agri-Energy ...
... Ill. and DUBLIN, Ireland, Sept. 10 /PRNewswire-FirstCall/,-- Concuity, ... ), today,announced the launch of its newly designed ... improves the ability of,visitors to quickly find information ... source of information for financial,professionals in the healthcare ...
Cached Biology Technology:Weil Gotshal Wins Major Victory for Applera; Secures Summary Judgment Invalidating Three Patents 2Biomaxx Systems Inc. Selected as Technical Consultant By Southern Cross Agricultural Developments 2Concuity Announces the Launch of Its New Fully Accessible Website - Concuity.Com 2Concuity Announces the Launch of Its New Fully Accessible Website - Concuity.Com 3
... Lipid adsorption and clarification reagent; ... the purification of antibodies, proteins, nucleic ... has negligible cross-reactivity, and improves downstream ... a solid-phase, non-ionic adsorbent supplied as ...
A simple, sensitive and reliable method for determining free sulfhydryl content in peptides, protein...
... a true benchtop incubator-shaker, has the smallest footprint ... footprint of 540 x 680 mm (W x ... (370 x 505 x 510mm). Available in 25 ... is ideal for shaking applications requiring controlled speed ...
Request Info...
Biology Products: