News Column

Findings from University of Minnesota in the Area of General Science Described

May 30, 2014



By a News Reporter-Staff News Editor at Science Letter -- Researchers detail new data in Science. According to news reporting originating from Minneapolis, Minnesota, by NewsRx correspondents, research stated, "Nanostructures are technological devices constructed on a nanometer length scale more than a thousand times thinner than a human hair. Due to the unique properties of matter at this scale, such devices offer great potential for creating novel materials and behaviors that can be leveraged to benefit mankind."

Our news editors obtained a quote from the research from the University of Minnesota, "This paper addresses a particular challenge involved in the design of nanostructures-their stochastic or apparently random response to external loading. This is because fundamentally the function that relates the energy of a nanostructure to the arrangement of its atoms is extremely nonconvex, with each minimum corresponding to a possible equilibrium state that may be visited as the system responds to loading. Traditional atomistic simulation techniques are not capable of systematically addressing this complexity. Instead, we construct an equilibrium map (EM) for the nanostructure, analogous to a phase diagram for bulk materials, which fully characterizes its response. Using the EM, definitive predictions can be made in limiting cases and the spectrum of responses at any desired loading rate can be obtained. The latter is important because standard atomistic methods are fundamentally limited, by computational feasibility, to simulations of loading rates that are many orders of magnitude faster than reality. In contrast, the EM-based approach makes possible the direct simulation of nanostructure experiments."

According to the news editors, the research concluded: "We demonstrate the method's capabilities and its surprisingly complex results for the case of a nanoslab of nickel under compression."

For more information on this research see: Mapping the stochastic response of nanostructures. Proceedings of the National Academy of Sciences of the United States of America, 2014;111(17):E1678-E1686. Proceedings of the National Academy of Sciences of the United States of America can be contacted at: Natl Acad Sciences, 2101 Constitution Ave NW, Washington, DC 20418, USA. (National Academy of Sciences - www.nasonline.org/; Proceedings of the National Academy of Sciences of the United States of America - www.nasonline.org/publications/pnas/)

The news editors report that additional information may be obtained by contacting S. Pattamatta, University of Minnesota, Minneapolis, MN 55455, United States. Additional authors for this research include R.S. Elliott and E.B. Tadmor (see also Science).

Keywords for this news article include: Science, Minnesota, Minneapolis, United States, North and Central America

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Science Letter


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