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Posted: Jul 23, 2014

Researchers succeed in measuring Poisson's Ratio of individual metal nanowires

(Nanowerk News) Professor John Boland, Principal Investigator at AMBER, the Science Foundation Ireland funded materials science centre at Trinity College Dublin has made a world-first breakthrough in area of material mechanics. Professor Boland and his team along with Prof. Sader from University of Melbourne have developed a simple, robust approach to measure one of the most fundamental engineering properties – the Poisson’s Ratio – on the nanoscale; a scale invisible to the human eye and 10,000 times smaller than the width of a human hair.
Professor John Boland
Professor John Boland
Poisson’s Ratio describes the fundamental elasticity of any solid; how a material’s width changes when placed under a mechanical load. It is a basic principle of engineering that dates back to 1811 and an important guide in the construction of buildings, skyscrapers and bridges. It allows engineers and builders to identify how much a material can be compressed and stretched and how much pressure it will withstand, before it collapses.

The Poisson’s Ratio has never before been measured on the nanoscale. This discovery by Professor Boland, who is also Research Professor in Trinity's School of Chemistry, will have a huge impact on the development of flexible electronics, wearable technology and implantable devices. It now means that ICT and electronics manufacturers and designers can gauge the elasticity of micro wires and metals and can test their suitability for use in flexible electronics such as smartphones, watches and tablets.

Commenting, Professor Boland said, “More than 200 years after Poisson’s Ratio was first introduced, we are delighted to have made this breakthrough on the nanoscale. The Poisson’s Ratio is crucial to construction and engineering, ensuring that all load-bearing structures such as buildings and bridges are made of the correct materials and ultimately are safe and sturdy. It has been a hugely effective guide for large scale structures, but it has until now, been unavailable to assist in the design of nanoscale structures that are so important for today’s technologies.
By translating this basic mechanical concept to the nanoscale, essentially measuring the elasticity of materials that are just a few hundred atoms across, it will open up huge opportunities for electronics and ICT. As we move to an age of wearable technology, it is crucial that scientists understand how materials respond at their very basic level.”
The discovery has been published in prestigious scientific publication Nature ("Poisson’s ratio of individual metal nanowires").
Professor Mark Ferguson, Director General of Science Foundation Ireland and Chief Scientific Adviser to the Irish Government said, “AMBER, as a new research centre, has been delivering on SFI strategy of excellent science with impact. The impact of Professor Boland’s discovery will be hugely significant for the electronics industry worldwide, which is growing apace. Wearable technology is becoming the norm, and its growth will undoubtedly be accelerated as a result of this development.”
Source: AMBER
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