Friction Current Events

Friction Current Events, Friction News Articles.
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VTT researcher finds explanation for friction
Friction is a key phenomenon in applied physics, whose origin has been studied for centuries. Until now, it has been understood that mechanical wear-resistance and fluid lubrication affect friction, but the fundamental origin of sliding friction has been unknown. Dr. Lasse Makkonen, Principal Scientist at VTT Technical Research Centre of Finland, has now presented an explanation for the origin of sliding friction between solid objects. According to his theory, the amount of friction depends on the surface energy of the materials in question. (2012-05-28)

NIST study helps auto engineers by the numbers
A NIST research project has identified a potential source of error in the surface roughness data used in the automotive industry to predict how friction affects production of metal parts during forming. With this improved analysis, automakers should be able to more easily incorporate lighter weight materials in their products and improve fuel efficiency. The NIST scientists presented their findings at the Society of Automotive Engineers' World Congress 2004, held in Detroit March 8-11. (2004-03-11)

The rub with friction
In a new paper in Nature Materials, Brandeis University professor Zvonomir Dogic and his lab explored friction at the microscopic level. They discovered that the force generating friction is much stronger than previously thought. The discovery is an important step toward understanding the physics of the cellular and molecular world and designing the next generation of microscopic and nanotechnologies. (2015-03-02)

Queen's University professor uses nanotechnology to prolong machine and engine life
Guojun Liu's discovery is recognized with the prestigious Captain Alfred E. Hunt Memorial Award. (2011-03-01)

Scaling friction down to the nano/micro realm
An improved method for correcting nano- and micro-scale friction measurements has been developed by researchers at the National Institute of Standards and Technology (NIST). The new technique should help designers produce more durable micro- and nano-devices with moving parts, such as tiny motors, positioning devices or encoders. (2004-05-24)

Models present new view of nanoscale friction
Friction is a force that affects any application where moving parts come into contact; the more surface contact there is, the stronger the force. At the nanoscale -- mere billionths of a meter -- friction can wreak havoc on tiny devices made from only a small number of atoms or molecules. With their high surface-to-volume ratio, nanomaterials are especially susceptible to the forces of friction. (2009-02-25)

Battling the force that wastes 1 out of every 10 gallons of gasoline in cars
Engine friction -- the force that wastes almost 1.4 million barrels of oil per day in cars and trucks in the United States alone -- could become less of a problem for fuel-conscious consumers thanks to promising new oils and other materials that scientists are developing. That's the topic of the cover story in the current issue of Chemical & Engineering News, ACS' weekly news magazine. (2010-10-13)

Bionanomachines -- proteins as resistance fighters
Friction limits the speed and efficiency of macroscopic engines. Is this also true for nanomachines? (2009-08-14)

Friction in the nano-world
Whether in vehicle transmissions, hip replacements, or tiny sensors for triggering airbags: The respective components must slide against each other with minimum friction to prevent loss of energy and material wear. Investigating the friction behavior of nanosystems, scientists from the Technische Universitaet Muenchen have discovered a previously unknown type of friction that sheds new light on some previously unexplainable phenomena. (2013-05-15)

How to control friction in topological insulators
Topological insulators are innovative materials that conduct electricity on the surface, but act as insulators on the inside. Physicists at the University of Basel and the Istanbul Technical University have begun investigating how they react to friction. Their experiment shows that the heat generated through friction is significantly lower than in conventional materials. This is due to a new quantum mechanism, the researchers report in the scientific journal Nature Materials. (2019-10-14)

What if the nanoworld slides
Some researchers at the International School for Advanced Studies have published in PNAS a study to better understand sliding friction in nanotribology: a new simulation model opens the way to new research methods, thanks to colloidal crystals. (2012-11-08)

Slippery when stacked: NIST theorists quantify the friction of graphene
Similar to the way pavement, softened by a hot sun, will slow down a car, graphene slows down an object sliding across its surface. But stack the sheets and graphene gets more slippery, say NIST theorists who developed new software to quantify the material's friction. (2012-01-11)

New nanogenerator harvests power from rolling tires
A group of University of Wisconsin-Madison engineers and a collaborator from China have developed a nanogenerator that harvests energy from a car's rolling tire friction. (2015-06-29)

Understanding the wetting of micro-textured surfaces can help give them new functionalities
The wetting and adhesion characteristics of solid surfaces critically depend on their fine structures. However, until now, our understanding of exactly how the sliding behaviour of liquid droplets depends on surface microstructures has been limited. Now, physicists Shasha Qiao, Qunyang Li and Xi-Qiao Feng from Tsinghua University in Beijing, China have conducted experimental and theoretical studies on the friction of liquid droplets on micro-structured surfaces. (2018-02-22)

Why is ice so slippery
The answer lies in a film of water that is generated by friction, one that is far thinner than expected and much more viscous than usual water through its resemblance to the 'snow cones' of crushed ice we drink during the summer. This phenomenon was recently demonstrated by researchers from the CNRS and ENS-PSL, with support from the École polytechnique, in a study that appeared in Physical Review X on Nov. 4, 2019 (2019-11-05)

What makes tires grip the road on a rainy day?
A team of scientists from Italy and Germany has recently developed a model to predict the friction occurring when a rough surface in wet conditions (such as a road on a rainy day) is in sliding contact with a rubber material (such as a car tire tread block) in an article to be published shortly in the Springer journal EPJE. (2011-10-19)

What's between a slip and a slide?
Tennis players can adapt their movement/playing style in response to subtle differences in court constructions, according to new research by engineers at the University of Sheffield. The findings - published online in the Journal of Sports Engineering and Technology - are the first steps towards setting international standards to characterize the interaction between shoes and surfaces. (2013-03-27)

In protein folding, internal friction may play a more significant role than previously thought
An international team of researchers has reported a new understanding of a little-known process that happens in virtually every cell of our bodies. (2012-04-24)

Laser-cooled ions contribute to better understanding of friction
Scientists from the QUEST Institute at the Physikalisch-Technische Bundesanstalt (PTB) have presented a model system which allows the investigation of atomic-scale friction effects and friction dynamics that are similar to those taking place, e.g., in proteins, DNA strands and other deformable nanocontacts. This model system consists of laser-cooled ions, which arrange themselves in so-called Coulomb crystals. (2017-07-13)

University of Akron researchers find thin layers of water can become ice-like at room temperature
New research by scientists at The University of Akron shows that a nanometer-thin layer of water between two charged surfaces exhibits ice-like tendencies that allow it to withstand pressures of hundreds of atmospheres. The discovery could lead to better ways to minimize friction in a variety of settings (2016-08-29)

Talc and petroleum jelly among the best lubricants for people wearing PPE
Talcum powder, a coconut oil-cocoa butter beeswax mixture, and petroleum jelly provide the best skin protection for long-term PPE use, say scientists. (2020-09-24)

Scientists identify molecular source of friction
Exactly 300 years after Guillaume Amontons produced the classic laws of friction, physicists have explained why Amontons' equations explain static friction so precisely. (1999-06-03)

Almost frictionless
Lubricants in bearings and gear units ensure that not too much energy is lost through friction. Yet it still takes a certain percentage of the energy to compensate for friction losses. Lubricants made of liquid crystals could reduce friction to almost zero. (2008-11-10)

Superslippery islands (but then they get stuck)
It's possible to vary (even dramatically) the sliding properties of atoms on a surface by changing the size and 'compression' of their aggregates: an experimental and theoretical study conducted with the collaboration of SISSA, the Istituto Officina dei Materiali of the CNR (Iom-Cnr-Democritos), ICTP in Trieste, the University of Padua, the University of Modena e Reggio Emilia, and the Istituto Nanoscienze of the CNR (Nano-Cnr) in Modena, has just been published in Nature Nanotechnology. (2015-06-22)

How friction evolves during an earthquake
Using high-speed photography and digital image correlation techniques, engineers show that friction along a faultline has a complex evolution during an earthquake that is dictated, in part, by slip velocity: the sliding of the two sides of the fault against one another. (2017-08-15)

New Hebrew University frictional motion study could provide tool for earthquake prediction
A new study on (2004-09-26)

Granular media friction explained: Da Vinci would be proud
There is a very peculiar dynamics of granular matter, such as dry sand or grains of wheat. When these granular particles are left on a vibrating solid surface, they are not only subject to random vibrations, they are also under the spell of solid friction forces. In a study published in EPJ E, Prasenjit Das from the Jawaharlal Nehru University, India, and colleagues extended our understanding of this problem. (2017-07-12)

Controlling friction by tuning van der Waals forces
This is a joint press release from Saarland University and the Leibniz Institute for New Materials. (2013-07-19)

Study shows how rough microparticles can cause big problems
Research finds the surface texture of microparticles in a liquid suspension can cause internal friction that significantly alters the suspension's viscosity -- effectively making the liquid thicker or thinner. The finding can help address problems for companies in fields from biopharmaceuticals to chemical manufacturing. (2017-10-12)

Why friction depends on the number of layers
Based on simulations, friction properties of the two-dimensional carbon graphene were studied by scientists of Karlsruhe Institute of Technology (KIT) and the Fraunhofer Institute for Mechanics of Materials IWM with scientists in China and the USA. In contact with monolayer graphene, friction is higher than with multi-layered graphene or graphite; friction force increases for continued sliding. The scientists attribute this to the real contact area and the evolving quality of frictional contact. (2016-12-05)

Earthquakes generate big heat in super-small areas
In experiments mimicking the speed of earthquakes, geophysicists at Brown University detail a phenomenon known as flash heating. They report in a paper published in Science that because fault surfaces touch only at microscopic, scattered spots, these contacts are subject to intense stress and extreme heating during earthquakes, lowering their friction and thus the friction of the fault. The localized, intense heating can occur even while the temperature of the rest of the fault remains largely unaffected. (2011-10-13)

The slipperiness of ice explained
Everybody knows that sliding on ice or snow, is much easier than sliding on most other surfaces. But why is the ice surface slippery? Researchers from AMOLF, the University of Amsterdam and the Max Planck Institute for Polymer Research in Mainz, have now shown that the slipperiness of ice is a consequence of the ease with which the topmost water molecules can roll over the ice surface. (2018-05-09)

Earthquakes explained? New research shows friction and fracture are closely related
Overturning conventional wisdom dating back to da Vinci, Hebrew University of Jerusalem researchers found that fracture -- how things break -- and friction -- how things slide -- are closely related. In laboratory-produced earthquakes, friction from the sliding of two contacting blocks occurred only when connections between their surfaces were ruptured -- fractured -- in an orderly process at nearly the speed of sound. The breakthrough helps explain processes deep beneath the earth's surface and describe the mechanics that drive earthquakes. (2014-07-08)

New composite materials prolong the service life of spare parts for equipment and vehicles
Studies have shown that hybrid powder materials based on natural layered silicates developed by the chemists of the Far Eastern Federal University (FEFU) and the Far Eastern Branch of the Russian Academy of Sciences (FEB RAS) decrease the friction ratio in metals sevenfold. (2018-10-09)

Cartilage-Inspired, Lipid-Based and Super Slippery Synthetic Hydrogels
Drawing inspiration from the mechanisms that lubricate the cartilage in our joints over a lifetime of wear, researchers designed extremely slippery hydrogels with self-renewing, lipid-based boundary layers, which result in a near 100-fold reduction in friction and wear over other hydrogels. (2020-10-15)

Bobsled runs -- fast and yet safe
They should prove a challenge for the athletes, but not put them in danger: bobsled runs have to be simulated before being built. This simulation is based on the friction levels of the runners on the ice. Now it has become possible to measure these levels accurately. These results will help build the run for the 2014 Olympic Winter Games. (2011-12-01)

Stirred, not shaken: Bond for future ships, iMacs has ONR roots
A state-of-the-art welding process refined for use in naval shipbuilding by the Office of Naval Research has crossed over to the world of computing. (2012-12-06)

Stress causes clogs in coffee and coal
Scientists still aren't sure what causes clogs in flowing macroscopic particles, like corn, coffee beans and coal chunks. But new experiments by Duke physicist Robert Behringer and his colleagues suggest that when particles undergo a force called shear strain, they jam sooner than expected. The results appear in the Dec. 15 issue of Nature. (2011-12-14)

University of Pennsylvania engineers reveal what makes diamonds slippery at the nanoscale
Penn engineers have conducted the first study of diamond friction supported by spectroscopy and determined 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. (2008-06-23)

Nano-bearings on the test bench
'Nano-machines of the future will need tiny devices to reduce friction and make movement possible. The C60 molecule, also known as fullerene or buckyball, seemed to many an excellent candidate for nano-bearings. Unfortunately, the results so far have been conflicting, calling for further studies, like the one carried out by a theoretical team involving the International School for Advanced Studies, the International Center for Theoretical Physics, the National Research Council and the Swiss Federal Laboratories for Materials Science and Technology. Through a series of computer simulations the scientists uncovered the reason for the experimental discrepancies. (2014-10-03)

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