Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

ORNL Researchers Tune Friction in Ionic Solids at the Nanoscale

29.01.2015

Friction impacts motion, hence the need to control friction forces. Currently, this is accomplished by mechanistic means or lubrication, but experiments conducted by researchers at the Department of Energy’s Oak Ridge National Laboratory have uncovered a way of controlling friction on ionic surfaces at the nanoscale using electrical stimulation and ambient water vapor.

The research, which demonstrates a new physical effect, was undertaken at the Center for Nanophase Materials Sciences, a DOE Office of Science User Facility at ORNL, and is published in the journal Scientific Reports.


ORNL

Researchers used electricity and water to control friction levels on ionic surfaces at the nanoscale. As water forms around the nanoscale electrode, it allows for further penetration into the sample surface, thereby increasing or decreasing friction.

“Our finding can have a significant technological impact on applications for both macroscopic and nanoscale devices,” said lead author Evgheni Strelcov. “Decreasing or increasing nanoscale friction at will and thus controlling mechanical energy losses and wear of a microelectromechanical system’s parts has enormous implications for applied energy research and opens a new vista for fundamental science studies.”

By inducing a strong electric field using an atomic force microscope, the researchers were able to both increase and decrease friction between a moving nanoscale electrode and an ionic surface. They argue that the primary effect responsible for this behavior is condensation of moisture from the surrounding air into liquid that can then reduce friction.

Simultaneously, further strengthening the electric field results in the nanoscale electrode penetrating the surface and an increase of friction. This penetration is a new and unexpected effect, and the overall approach differs from other methods of friction control that often require adding a lubricant to the system instead of drawing on resources readily available in the immediate environment.

Additionally, unlike other electrochemical friction control practices, the new technique does not require an electrical current, which is associated with energy losses.

“Absence of current is highly beneficial from a power-saving perspective as it eliminates Joule heating and other parasitic power-consuming effects,” says Bobby Sumpter, who led the group developing associated theoretical models.

This work builds on extensive efforts at CNMS exploring the electrical manipulation of mechanical, electrochemical and ferroelectric properties of materials.

“We adopted this biased view on the nanoscale almost a decade ago,” said contributing author Sergei Kalinin. “Now we can proceed from observation to control of even such sublime phenomena as friction, and it is indeed very surprising and promising that we can both increase and decrease it.”
The paper can be accessed at: http://www.nature.com/srep/2015/150127/srep08049/full/srep08049.html

The articles authors are Oak Ridge National Laboratory’s Rajeev Kumar and Bobby Sumpter of the Center for Nanophase Materials Sciences and Computer Science and Mathematics Division; Vera Bocharova of the Chemical Science Division; and Sergei Kalinin, Evgheni Strelcov and Alexander Tselev of the Center for Nanophase Materials Sciences.

The work was supported by the Laboratory Directed Research and Development Program at the Department of Energy’s Oak Ridge National Laboratory. The research was conducted at the Center for Nanophase Materials Sciences, a DOE Office of Science User Facility at Oak Ridge National Laboratory.

UT-Battelle manages ORNL for the Department of Energy’s Office of Science. The Office of Science is the single largest supporter of basic research in the physical sciences in the United States, and is working to address some of the most pressing challenges of our time. For more information, please visit http://science.energy.gov/ .

###

Image: http://www.ornl.gov/Image%20Library/Main%20Nav/ORNL/News/News%20Releases/2015/FrictionRelease_hr.jpeg?code=9291070a-54fc-4949-a54c-792b949d956d 

Caption: Researchers used electricity and water to control friction levels on ionic surfaces at the nanoscale. As water forms around the nanoscale electrode, it allows for further penetration into the sample surface, thereby increasing or decreasing friction.

Chris Samoray | newswise

More articles from Materials Sciences:

nachricht Switched-on DNA
20.02.2017 | Arizona State University

nachricht Using a simple, scalable method, a material that can be used as a sensor is developed
15.02.2017 | University of the Basque Country

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

Im Focus: Three Magnetic States for Each Hole

Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".

Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

Tune your radio: galaxies sing while forming stars

21.02.2017 | Physics and Astronomy

Improved Speech Intelligibility and Automatic Speech-to-Text Conversion for Call Centers

21.02.2017 | Trade Fair News

36 big data research projects

21.02.2017 | Interdisciplinary Research

VideoLinks
B2B-VideoLinks
More VideoLinks >>>