A material that changes colour as its tension alters could lead to bandages that warn you when they are too tight or loose
, where its elasticity is an undesirable property that means it is normally attached to a rigid backing plate.
“On a whim, I got one of these high-school hologram kits that you could buy in a museum or something,” says Harvey Miller. “And it turned out that I had most stuff in it that we needed. Now, having spent three years of my PhD trying other ways of doing this, I was almost annoyed, actually.”Massachusetts Institute of Technology
It was a surprise that a combination of materials developed for holographics and an obsolete photography technique could be combined to create materials with novel characteristics, he says. “This technique was sat there for a very long time without really being touched,” says Harvey Miller. “When we figured this out and started looking at writing a paper, for the first couple of months, we were like ‘surely someone has done this, this is sort of there in plain sight’, but they just hadn’t.
The team says that one application for the material could be mechanical sensors that can show stress and strain visibly, without the need for electronics. It could also be used in medical bandages to show how tightly they are being applied, or incorporated into clothing for fun., also at MIT, says similar advances may be possible by combining old scientific techniques and materials that weren’t available at the time.
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