Melbourne, Australia (SPX) Aug 10, 2016
Science fiction is inching closer to reality with the development of revolutionary self-propelling liquid metals – a critical step towards future elastic electronics.
While building a shape-shifting liquid metal T-1000 Terminator may still be far on the horizon, the pioneering work by researchers at RMIT University in Melbourne, Australia, is setting the foundation for moving beyond solid state electronics towards flexible and dynamically reconfigurable soft circuit systems. Modern electronic technologies like smart phones and computers are mainly based on circuits that use solid state components, with fixed metallic tracks and semiconducting devices.
But researchers dream of being able to create truly elastic electronic components – soft circuit systems that can act more like live cells, moving around autonomously and communicating with each other to form new circuits rather than being stuck in one configuration.
Liquid metals, in particular non-toxic alloys of gallium, have so far offered the most promising path for realising that dream.
As well as being incredibly malleable, any droplet of liquid metal contains a highly-conductive metallic core and an atomically thin semiconducting oxide skin – all the essentials needed for making electronic circuits.
To work out how to enable liquid metal to move autonomously, Professor Kourosh Kalantar-zadeh and his group from the School of Engineering at RMIT first immersed liquid metal droplets in water.
The research lays the foundation for being able to use “electronic” liquid metals to make 3D electronic displays and components on demand, and create makeshift and floating electronics.
The research, which has potential applications in a range of industries including smart engineering solutions and biomedicine, is published on 4 August in Nature Communications.
In the paper, first author Dr Ali Zavabeti details the precise conditions in which liquid metals can be moved or stretched, how fluid on their surfaces moves around and – as a result – how they can make different flows.
The work also explains how the electric charges that accumulate on the surface of liquid metal droplets, together with their oxide skin, can be manipulated and used.
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