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Katie Harris-Carbon Nanotubes CE330
Transcript of Katie Harris-Carbon Nanotubes CE330
What are carbon nanotubes?
Like graphite and Diamonds, they are allotropes of pure carbon
Tubes of carbon atoms less than a nanometer (one billionth of a meter) in diameter.
D:L = 1:132,000,000
Possess a combination of unique properties that make them highly programmable for a variety of purposes
The chemical bonding of CNT is composed entirely of sp2 bonds
Can be extremely efficient conductors of electricity and heat; depending on their configuration
How are carbon nanotubes made?
Properties of Carbon Nanotubes
Applications of Carbon Nanotubes
Carbon nanotubes are stiff: 5 times stiffer than steel
They can withstand a lot of stress and strain.
They have a high tensile strength: 50 times higher than steel.
They are lightweight
They can be metallic or semiconducting depending on their structure or chirality.
The best way of synthesizing carbon nanotubes involves passing a current of about 50 amps between two graphite electrodes in an atmosphere of helium. This causes the graphite to vaporize, some of it condensing on the walls of the reaction vessel and some of it on the cathode, or the positively charged electrode. It is the deposit on the cathode which contains the carbon nanotubes.
Thanks for your attention!
Overview of this presentation:
Carbon nanotubes have the potential of curing cancer, building space elevators, and creating real-world Spidermen (Not that Toby Maguire stuff.)
Two main types
Single-walled & Multi-walled
Created by rolling up a graphene sheet into a tube shape
They have a property known as "Chirality"
Chirality is determined by the angle the graphene sheet is rolled at
What are Carbon nanotubes
Why are Carbon nanotubes cool
Why you should care
Super capacitors Improved Efficiency for solar cells
Structural Support for armed forces
•Nanoscale electronic devices could be made from nanotubes.
•Because they can be metallic or semiconducting.
•Some nanotubes have conductivities higher than that of copper, while others behave more like silicon.
•Silicon is used in electronics as a semiconductor.
•Carbon nanotubes may replace silicon.
•To do this we would need to arrange many thousands of nanotubes in a defined pattern
•We do not yet have the degree of control necessary to achieve this.
Extremely small and lightweight, making them excellent replacements for metallic wires
Resources required to produce them are plentiful, and many can be made with only a small amount of material
Are resistant to temperature changes, meaning they function almost just as well in extreme cold as they do in extreme heat
Have been in the R&D phase for a long time now, meaning most of the kinks have been worked out
As a new technology, investors have been piling into these R&D companies, which will boost the economy
Despite all the research, scientists still don't understand exactly how they work
Extremely small, so are difficult to work with
Currently, the process is relatively expensive to produce the nanotubes
At the rate our technology has been becoming obsolete, it may be a gamble to bet on this technology
Why you should care