【神奇新材料:摇一摇,液体变固体】

【神奇新材料:摇一摇,液体变固体】英国科学家近日发现了一种新材料,当静置时,这种材料呈现粘稠液体状,但在简单的摇晃后,就会变成形似口香糖的胶状材料,同时这种材料还能从固体变会液体,这意味着其相对容易清理,不过科学家表示,他们还没有想好这种材料有何用途。

Weird shape-shifting goo turns from liquid to solid with a simple shake...but experts admit they don't know what to do with it
By RYAN O'HARE

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When it comes to the world of chemistry, appearances can be deceptive.
This has proved to be the case with a goo discovered by British scientists which can be turned from a liquid to a rubbery solid just by shaking it.
However, scientists admit they don't know what to do with the strange material and asking people to come up with suggestions.
The shake-gel was discovered by chemical engineers at Imperial College London, who were trying to find materials with new properties.
After mixing two compounds together – one containing silica and another called polyethyeleneoxide – they found the resulting material had strange properties.
A video from the engineering lab shows a small glass jar containing some of the thick milky liquid, which runs around the inside of the container like a typical liquid.
But when a vigorous shake, the liquid turns into a goo which can then be kneaded into a putty-like material. If left for long enough, it will revert back into a liquid.
Professor Paul Luckham, who led the research group at Imperial, said: 'Serendipity is a beautiful thing, especially when you lead a lab.
'We are still experimenting with the shake-gel to fully understand its properties and its potential, but it certainly displays some unique qualities that we are hoping to explore further.'

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The team is yet to find a definitive application for their new shake-gel, but researchers believe it could potentially find a number of applications, such as an edible version which could be used to make chewing gum.
By using this sort of material for gum, it could help spell the end for streets covered in hardened patches, as the dried gum could revert back to liquid after a time, making it easier to clear from surfaces.
The goo is part of a class of materials called non-Newtonian fluids.
These materials don't have a contact viscosity - in that they flow at different rates.
Its properties can be tweaked so that it changes physical state straight away, or over a number of days, just by changing the mix of compounds.
However, things get weirder still for this goo.
The Imperial team found that while the goo shared some of the properties of non-Newtonian fluids, versions of it change state after stirring, and that it can even change after being at rest for a number of hours.

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A similar effect can be replicated at home, using powdered custard or by mixing paint with corn flour.
There are countless videos on YouTube demonstrating the effect of vibration on these liquids, and how to make your own.
When the mixtures are placed inside the cone of a speaker, and the music turned up, they start to pulse and twitch due to the vibrations.
They quickly transform from a liquid to a strange putty like goo which stretches up and collapses again.
It can also be rolled into a solid ball, but if someone stops applying pressure, the goo will revert to liquid and ooze through their fingers.
When the music stops, the lack of vibrations enable the goo to revert back to its former liquid state.

 

http://www.dailymail.co.uk/sciencetech/article-3499051/Weird-shape-shifting-goo-turns-liquid-solid-simple-shake-experts-admit-don-t-know-it.html


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