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Graphene on The One Show

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Subido el 16 de octubre de 2013 por Samuel E.

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An amazing video about graphene

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The familiar gadgets of everyday life they get faster slicker and slimmer but an amazing new 00:00:01
material discovered by British scientists will transform this technology forever it will allow 00:00:11
us to slim it all down to the thickness of a piece of paper it's called graphene even under 00:00:17
the microscope it doesn't look much but it won a Nobel Prize for the two scientists who discovered 00:00:24
and it's been lauded as the miracle material of the 21st century. 00:00:30
It's stronger than diamond, more conductive than copper, 00:00:35
more flexible than rubber, 00:00:38
and it's so thin you can barely see it with the naked eye. 00:00:40
Graphene is made from the stuff in your pencil, graphite. 00:00:44
And graphite is millions of microscopic layers of tightly packed carbon. 00:00:48
When I put my thumb into the graphite, give it a rub around, 00:00:52
And it gets covered in a layer of it. 00:00:57
If I then press that back onto the paper, millions of layers are peeled off. 00:01:01
If I keep smudging my thumb across the paper, these layers of graphite get thinner and thinner. 00:01:09
And if I keep going, eventually I'll end up with a layer of graphite one atom thin. 00:01:15
And at that point, I've got graphene. 00:01:21
Materials scientist Dr Aravind Vijayaragavan works with the team who discovered it. 00:01:24
This is graphene at about 20 million times magnification and you can see the individual 00:01:29
carbon atoms which are the white dots you see here and each carbon atom is connected 00:01:36
to three other carbon atoms. 00:01:41
Now the carbon carbon bond is so strong that actually makes graphene 200 times stronger 00:01:43
than steel. 00:01:50
To demonstrate graphene's properties, Aravind dissolves graphite, the stuff from your pencil, 00:01:51
in a solvent, then injects it into a special printer cartridge. This sprays a thin layer 00:01:56
of graphene onto a cellophane backing, which holds the thin graphene layer together. 00:02:03
What we have here then is cellophane coated with a layer of graphene. 00:02:08
You sure? 00:02:12
Yes. 00:02:13
Because it just looks like a piece of cellophane to me. 00:02:14
On its own, cellophane cannot conduct electricity, but when graphene is added, something remarkable 00:02:16
happens. 00:02:22
We have an LED lamp there, and as soon as you wire it up, the lamp starts to glow, which 00:02:23
means that there is current flowing through a piece of plastic. 00:02:30
As graphene is so thin, there is very little electrical resistance, making it the most 00:02:34
conductive material ever created, allowing scientists to shrink our circuit boards, leading 00:02:39
to smaller phones and computers. But graphene has another key property, flexibility. 00:02:45
You can essentially pick it up and you can bend it and you can twist it and still the 00:02:52
current flows through it and the lamp stays on. 00:02:57
That is really quite incredible. 00:03:00
This flexibility is getting electronics giants excited. Prototype animations show graphene 00:03:03
applied to super thin bendy plastics, making phones and tablets foldable. 00:03:08
So this is really revolutionary. This is going to change things, isn't it? 00:03:14
Yes. 00:03:18
Graphene's thinness also means it's 97% transparent, tackling a problem we face with touchscreen technology. 00:03:19
Today's mobile phones contain an element called indium in the touchscreens to make them work. 00:03:27
It's rare and becoming more expensive, and the coating that it makes is brittle and inflexible. 00:03:33
flexible. On the other hand, super bendy, conductive and transparent graphene is made from 00:03:40
carbon, the sixth most abundant element in the universe. But high quality graphene is currently 00:03:46
hard to manufacture on a large scale. Any imperfections in the process dramatically 00:03:53
reduces its conductivity. If scientists can crack this problem, it won't just be consumer 00:03:57
technology that will change. Electric car batteries built from millions of layers of graphene 00:04:04
will charge in minutes, thanks to its high conductivity. 00:04:09
Microscopic graphene sensors inside our body 00:04:14
could detect harmful microbes, 00:04:17
responding to tiny changes in conductivity 00:04:19
produced by individual bacteria cells. 00:04:22
Graphene may well be the biggest technological revolution 00:04:25
since the silicon chip. 00:04:28
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Idioma/s:
en
Etiquetas:
EducaMadrid
Autor/es:
Graphene Wonderstuff - The One Show, BBC1, 11th June 2013
Subido por:
Samuel E.
Licencia:
Reconocimiento - No comercial - Compartir igual
Visualizaciones:
83
Fecha:
16 de octubre de 2013 - 20:06
Visibilidad:
Público
Centro:
IES JOAQUIN ARAUJO
Duración:
04′ 48″
Relación de aspecto:
1.78:1
Resolución:
640x360 píxeles
Tamaño:
21.72 MBytes

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