SITE SEARCH:
video overview
ADS

IIr Associates, Inc.
Publisher of The Virginia Engineer

Print-Publishing Services
Web Site Design-Coding-Hosting
Business Consulting

Phone: (804) 779-3527
sales@iirassoc.com
iirassoc.com

NEWS
Nanoscale Sensors Created To Better See How High Pressure Affects Materials
January 13, 2020

Researchers have developed new nanoscale technology to image and measure more of the stresses and strains on materials under high pressures.


Krishan Kumar Pandey, Valery Levitas and Mehdi Kamrani, left to right, study materials subject to high pressures in Levitas' Iowa State University laboratory. Photo by Christopher Gannon/Iowa State University.

As the researchers reported in the journal Science, that matters because, “Pressure alters the physical, chemical and electronic properties of matter.”

Understanding those changes could lead to new materials or new phases of matter for use in all kinds of technologies and applications, said Valery Levitas, a paper co-author and Anson Marston Distinguished Professor in Engineering at Iowa State University, the Vance Coffman Faculty Chair and professor in aerospace engineering.

Prof. Levitas – whose lab specializes in experimental testing and computational modeling of high-pressure sciences – said the new sensing technology could also advance high-pressure studies in chemistry, mechanics, geology and planetary science.

The paper, “Imaging stress and magnetism at high pressures using a nanoscale quantum sensor,” describes how the researchers fit a series of nanoscale sensors – they call them nitrogen-vacancy color centers – into diamonds used to exert high pressures on tiny material samples. Typically, those “diamond anvil” experiments with materials squeezed between two diamonds have allowed researchers to measure pressure and changes in volume.

According to information, the new system allows researchers to image, measure and calculate six different stresses – a much more comprehensive and realistic measure of the effects of high pressure on materials. The new tests also allow researchers to measure changes in a material’s magnetism.

“This has been one of the key problems in high-pressure science,” Prof. Levitas said. “We need to measure all six of these stresses across a diamond and sample. But it’s hard to measure all of them under high pressure.”

Prof. Levitas’ lab has done unique experiments by putting materials under high pressure and then giving them a twist, allowing researchers to drastically reduce phase transformation pressure and search for new phases of matter, which may have technological applications.

The sensor enables “pursuit of two complementary objectives in high-pressure science: understanding the strength and failure of materials under pressure (e.g., the brittle-ductile transition) and discovering and characterizing exotic phases of matter (e.g., pressure-stabilized high-temperature superconductors),” the researchers wrote in their paper.

The nitrogen-vacancy sensing technology described in the paper has also been used to measure other material properties – for example, electric and thermal characteristics. The researchers wrote it “can now straightforwardly be extended to high-pressure environments, opening up a large range of experiments for quantitatively characterizing materials at such extreme conditions.”


  ------   News Item Archive  -----  
 
 
The Virginia Engineer on facebook
The Virginia Engineer RSS Feed