Navigation Links
Researchers measure elusive repulsive force from quantum fluctuations
Date:1/7/2009

CAMBRIDGE, Mass. January 7, 2008 Researchers from Harvard University and the National Institutes of Health (NIH) have measured, for the first time, a repulsive quantum mechanical force that could be harnessed and tailored for a wide range of new nanotechnology applications.

The study, led by Federico Capasso, Robert L. Wallace Professor of Applied Physics at Harvard's School of Engineering and Applied Science (SEAS), will be published as the January 8 cover story of Nature.

The discovery builds on previous work related to what is called the Casimir force. While long considered only of theoretical interest, physicists discovered that this attractive force, caused by quantum fluctuations of the energy associated with Heisenberg's uncertainty principle, becomes significant when the space between two metallic surfaces, such as two mirrors facing one another, measures less than about 100 nanometers.

"When two surfaces of the same material, such as gold, are separated by vacuum, air, or a fluid, the resulting force is always attractive," explained Capasso.

Remarkably, but in keeping with quantum theory, when the scientists replaced one of the two metallic surfaces immersed in a fluid with one made of silica, the force between them switched from attractive to repulsive. As a result, for the first time, Capasso and his colleagues measured what they have deemed a repulsive Casimir.

To measure the repulsive force, the team immersed a gold coated microsphere attached to a mechanical cantilever in a liquid (bromobenzene) and measured its deflection as the distance from a nearby silica plate was varied.

"Repulsive Casimir forces are of great interest since they can be used in new ultra-sensitive force and torque sensors to levitate an object immersed in a fluid at nanometric distances above a surface. Further, these objects are free to rotate or translate relative to each other with minimal static friction becau
'/>"/>

Contact: Michael Patrick Rutter
mrutter@seas.harvard.edu
617-496-3815
Harvard University
Source:Eurekalert  

Page: 1 2

Related biology technology :

1. Researchers improve ability to write and store information on electronic devices
2. Long-awaited international ethical guidelines for biobank researchers
3. CU researchers shed light on light-emitting nanodevice
4. Stevens researchers provide new information about mass spectrometry
5. Researchers measure carbon nanotube interaction
6. Researchers underscore limitations of genetic ancestry tests
7. ASU researchers improve memory devices using nanotech
8. UD researchers race ahead with latest spintronics achievement
9. Researchers outline structure of largest nonvirus particle ever crystallized
10. Ames Laboratory researchers solve fuel-cell membrane structure conundrum
11. Researchers use magnetism to target cells to animal arteries
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Researchers measure elusive repulsive force from quantum fluctuations
(Date:9/16/2014)... 2014 According to Jeff Howell, Partner ... ITRA Global, new development in Downtown Toronto is expanding ... approving another 755 storeys of new development last week ... will be dominating the Toronto skyline for the foreseeable ... unquenchable thirst for new development. , As the Toronto ...
(Date:9/16/2014)... September 16, 2014 RENU 28, the world's ... became available for purchase in Australia and New Zealand ... tour beginning September 16th. The tour will make stops in ... Bundaberg on the 18th, Sydney on the 20th, and Melbourne ... Australia and New Zealand and to educate people about the ...
(Date:9/15/2014)... UPTON, NYHeat drives classical phase transitionsthink solid, ... happen when the temperature drops. If phase ... where quantum mechanics reigns, subtle fluctuations can ... from the U.S. Department of Energy,s Brookhaven ... explored this frigid landscape of absolute zero ...
(Date:9/15/2014)... 2014   Global Science & Technology, Inc. ... and services for satellite and weather systems, was ... Services (OASIS) from the General Services Administration (GSA) ... provide the government best-value solutions for complex professional ... in Pool 4. The OASIS SB award has ...
Breaking Biology Technology:ITRA Global Reports Downtown Toronto Real Estate Development is in High Gear 2ITRA Global Reports Downtown Toronto Real Estate Development is in High Gear 3Global Wellness Company Hosts ASEA Australia Tour September 16-22 2Elusive quantum transformations found near absolute zero 2Elusive quantum transformations found near absolute zero 3Global Science & Technology, Inc. Awarded GSA OASIS Small Business Contract 2Global Science & Technology, Inc. Awarded GSA OASIS Small Business Contract 3
... EDMONTON, Sept. 30 /PRNewswire-FirstCall/ - Quest PharmaTech Inc. ... company developing and commercializing products for the treatment ... a pipeline of late-stage immunotherapy product candidates from ... of product candidates consists of five monoclonal antibodies ...
... ... , ... (PRWEB) September 30, 2009 -- Authenware , a leading keystroke biometric developer, today ... with software-based biometric protection for its federal employees. Calculating intrinsic behavioral typing patterns ...
... Inc. (Nasdaq: BMRN ) today announced that Jean-Jacques Bienaime, ... and webcast on Wednesday, October 28, at 5:00 p.m. ET ... U.S. / Canada Dial-in Number: 800.299.6183, ... Participant Code: 51404008, Replay Dial-in Number: 888.286.8010, ...
Cached Biology Technology:Quest PharmaTech Acquires Late-Stage Immunotherapeutic Antibody Pipeline 2Quest PharmaTech Acquires Late-Stage Immunotherapeutic Antibody Pipeline 3Quest PharmaTech Acquires Late-Stage Immunotherapeutic Antibody Pipeline 4Spain's Health Ministry Contracts Authenware to Fortify System Security Prior to Flu Season 2Spain's Health Ministry Contracts Authenware to Fortify System Security Prior to Flu Season 3BioMarin to Host Third Quarter 2009 Financial Results Conference Call and Webcast on Wednesday, October 28 at 5:00 p.m. ET 2
(Date:9/15/2014)... disease (CVD) claims 17 million lives each year, while ... million. 1 New research presented by international scientists ... France on September 15, 2014, suggests that milk consumption ... At the Milk and Dairy Products in Human ... for hypertension and CVD was examined by Dr. Sabita ...
(Date:9/15/2014)... need for vitamin E and how much is enough, ... of this essential micronutrient are especially critical for the ... may become pregnant. , A lifelong proper intake of ... complicated by the fact that this nutrient is one ... It has been estimated that only a tiny fraction ...
(Date:9/12/2014)... , September 12, 2014 ... ( http://www.researchandmarkets.com/research/trs4c7/global ) has announced the addition ... Report 2014" report to their offering. ... Industry Report 2014 is a professional and ... the global fingerprint lock industry. , ,The ...
Breaking Biology News(10 mins):Dairy consumption linked to lower blood pressure and cardiovascular disease risk 2Vitamin E intake critical during 'the first 1,000 days' 2Vitamin E intake critical during 'the first 1,000 days' 3Global Fingerprint Lock Industry Report 2014 2
... compound found in cocoa, are so striking that it may ... health, reports Marina Murphy in Chemistry & Industry, the magazine ... Medical School, told C&I that epicatechin is so important that ... spent years studying the benefits of cocoa drinking on the ...
... joint funding from the Engineering and Physical Science Research ... develop an innovative sensor to detect bacteria. The new ... fluorescent signal when it encounters bacteria, allowing scientists to ... methodologies. , The new technology will be ...
... childbearing age struggle with the heartache of infertility. Now there ... of a mutation in a gene that causes male infertility ... dominant mutation that leads specifically to infertility in a mammal ... for similar mutations in the DNA of infertile men. , ...
Cached Biology News:Cocoa 'vitamin' health benefits could outshine penicillin 2Researchers find gene mutation that causes infertility in male mice 2
Phospho-TAO2 (S181) Affinity Purified Polyclonal Ab Protein Family: Other Intracellular Kinases...
PEG 8000, Molecular Biology Grade...
... Deacetylase (HDAC) Antibody Sampler Kit Kit ... Catalog #2062, 40 ul Histone Deacetylase 3 ... Deacetylase 4 (HDAC4) Antibody, Catalog #2072, 40 ... #2082, 40 ul Histone Deacetylase 6 (HDAC6) ...
Immunogen: Synthetic Peptide: C N(185) D G T E F G G S I Y Q K(197) Storage: -20 C, Avoid Freeze/Thaw Cycles...
Biology Products: