Mollusc shell design produces glass 200 times the strength
A new laser engraving technique could pave the way for longer-life
smartphone screens.
Scientists have developed a way of making glass up to 200 times
stronger, which could increase the longevity of smartphone screens. The
glass can be deformed by five percent before snapping, as opposed to
regular glass which can only handle 0.1 percent. The solution is
inspired by the way mollusc shells are put together. A material called
nacre makes the
otherwise brittle shells incredibly strong, as well as
shiny. It's made up of microscopic, interlocking blocks with curvy
boundaries. This means that any energy from an impact is dispersed and
absorbed to prevent shattering.
The Canadian researchers engraved the glass with curved microscopic
cracks using a pulsed 3D laser in order to mimic the mollusc shell
design. They claim it is relatively economical to produce, only
requiring the laser and a precise hand, or machine, to guide it.
The same technique could potentially be applied to other brittle
materials, the researchers believe, such as ceramics and polymers.
However, one of the most promising possibilities is the glass's
application in hand-held electronics: the average lifespan of a mobile
phone is a mere 18 months, with many of them discarded due to cracked
and broken screens. Innovations such as Gorilla Glass have introduced
chemically strengthened touch-screens into the smartphone material
eco-system. But the 'mollusc' glass proposed by the Canadian research
team could be a more cost-effective alternative for manufacturers,
although it is still in its commercial infancy.
Rodrigo Bautista, Senior Sustainability advisor at Forum for the
Future, says a "different business model, one which promotes a more
circular approach to internal components and a continuation of software
updates for older devices", is what's truly needed to address
electronics waste.
However, he says: "less breakable glass would make such a model more
feasible by significantly raising the life expectancy of our electronic
devices.
- GreenFutures
|