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December 21 2019
in Technology

Tampere's ductile glass is “transparent metal”: it bends, it doesn't break.

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Tampere's ductile glass is “transparent metal”: it bends, it doesn't break.
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tags: laserMaterialsglass

It will bend, it will "dent" like a thin sheet of transparent metal, but it won't go to pieces. Here is the ductile glass of the University of Tampere.

Gianluca Ricciodi Gianluca Riccio
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Dr. Erkka Frankberg and co-authors from Finland, France, Austria, Norway, USA and Italy (there is also "our" Matteo Vanazzi from the Politecnico di Milano) used a technique called pulsed laser deposition to convert thealumina (Al 2 O 3 ) in a state similar to glass.

"Conventional glass is fragile and shatters easily under pressure", he said Frankberg about the newly developed "transparent metal". “We have discovered a way to make glass that exhibits ductile behavior. In other words, our glass is pliable and harder than conventional glass. "

The method adopted

It is extremely difficult to convert aluminum oxide into a glassy substance

Traditional glass manufacturing processes cannot be applied to aluminum oxide because it easily transforms into the crystalline form. The solution is to cool the material extremely quickly from a high temperature to prevent crystallization. What we get is a translucent ductile metal.

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A detail of the ductile glass made in Tampere.

Making ductile glass that exhibits plasticity is extremely challenging. For this the process must be further refined and developed before the new type of glass can be produced on a large scale almost like a transparent metal and diffused like others. super materials under study today.

"Both aluminum and oxygen are abundant on Earth, but we need an unconventional manufacturing process to achieve the desired properties", has explained Frankberg.

The ductile glass produced must also be pure and flawless

A high quality glass material is mandatory if you want to make it collapsible. The presence of any imperfections in the glass such as cracks, bubbles or impurities, can cause fractures. "In our glass, atoms are able to move from one position to another before the glass reaches the stress necessary for fracturing, while in conventional glass, the fracture stress is achieved before the atoms begin to move, which is why which the glass breaks easily, " says Frankberg.

The team prepared thin films of this glass and subjected them to mechanical stress. The material showed properties of a "transparent metal", was stretched and compressed, as well as shear.

In the future we will have glasses that deform, "dent" but do not break.

“Demonstrating flexibility is just the beginning. We will then examine which other types of glass have the same capacity ”.

Il work of the team was published in the November 15, 2019 issue of the magazine Science .

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The author

Gianluca Riccio, copywriter and journalist - Born in 1975, he is the creative director of an advertising agency, he is affiliated with the Italian Institute for the Future, World Future Society and H +, Network of Italian Transhumanists.

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