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Solid in light, soft in the dark: here are the dynamic materials

A team has developed one of the dynamic materials with the most unusual qualities: it can increase its hardness when illuminated, and return soft in the dark.

Gianluca Ricciodi Gianluca Riccio
in Technology
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July 16 2019
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“Everything flows”, said the philosopher Heraclitus. God, he never actually formulated it in what we know of his writings, but it's a different kettle of fish. The meaning, however, is known: it indicates the eternal change we live in the world.

Apparently they are no exception to the new dynamic materials resulting from scientific work, which can change their properties in response to different environmental stimuli.

Dynamic materials are a very promising field of research, and their versatility will allow their massive use in different applications of all kinds.

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The most special of all

An international team of scientists has come up with a material with rather special qualities. It has the ability to increase its hardness when illuminated, and become soft again in the dark.

Can you imagine the possible implications? The endless uses of this material in the field of 3D printing?

This material could be used, for example, to build an infrastructure on which to print complex or specially shaped objects. A "skeleton" that would melt by itself once the printing was finished.

Dynamic materials, the authors
Professor Christopher Barner-Kowollik (right) with the "light stabilized dynamic material" and study co-author Dr Hannes Houck

The result was achieved by the joint work of researchers from Australia's Queensland University of Technology (QUT). The University of Ghent in Belgium and the Karlsruhe Institute of Technology in Germany gave excellent support.

It is a polymer obtained from a special chemical combination that includes the common mothballs and molecules called thiazolindioni.

Together, these elements constitute the main "super power" that this material has to change its state depending on the dark or the light.

Dynamic materials, operation
The working principle

An object printed with this material and exposed to a green LED light becomes stable and solid. Just press the switch and turn off the light to break the chemical bonds of its structure. With the lights off, a soft and malleable mass returns.

The light comes on again, and the material immediately returns solid and stable.

You have to turn the light on and off twenty times, as in children.

The research was published in the Journal of the American Chemical Society. Here is a video showing the material in action.

Photos: Queensland University of Technology

tags: Professional Chermistypolymers
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