PPT - Carbon Nanotubes - Civil Engineering (CE) PDF Download

 Page 1


Carbon Nanotubes
Page 2


Carbon Nanotubes
What are Carbon nanotubes.
Carbon nanotubes (CNTs) are allotropes
of carbon. These cylindrical carbon
molecules have interesting  properties
that make them potentially useful in
many applications in nanotechnology,
electronics, optics and other fields of
materials science, as well as potential
uses in architectural fields. They exhibit
extraordinary strength and unique
electrical properties, and are efficient
conductors of heat. Their final usage,
however, may be limited by their
potential toxicity.
Page 3


Carbon Nanotubes
What are Carbon nanotubes.
Carbon nanotubes (CNTs) are allotropes
of carbon. These cylindrical carbon
molecules have interesting  properties
that make them potentially useful in
many applications in nanotechnology,
electronics, optics and other fields of
materials science, as well as potential
uses in architectural fields. They exhibit
extraordinary strength and unique
electrical properties, and are efficient
conductors of heat. Their final usage,
however, may be limited by their
potential toxicity.
How CNTs are made
 Arc discharge
– CNTs Can be found in the carbon soot of graphite
electrodes during an arc discharge involving high current.
This process yields CNTs with lengths up to 50 microns.
 Laser Ablation
– In the laser ablation process, a pulsed laser vaporizes a
graphite target in a high-temperature reactor while an inert
gas is inserted into the reactor. Nanotubes develop on the
cooler surfaces of the reactor as the vaporized carbon
condenses.
 Other methods where CNTs are created:
- Chemical Vapor Decomposition
- Natural, incidental, and controlled flame environments
Page 4


Carbon Nanotubes
What are Carbon nanotubes.
Carbon nanotubes (CNTs) are allotropes
of carbon. These cylindrical carbon
molecules have interesting  properties
that make them potentially useful in
many applications in nanotechnology,
electronics, optics and other fields of
materials science, as well as potential
uses in architectural fields. They exhibit
extraordinary strength and unique
electrical properties, and are efficient
conductors of heat. Their final usage,
however, may be limited by their
potential toxicity.
How CNTs are made
 Arc discharge
– CNTs Can be found in the carbon soot of graphite
electrodes during an arc discharge involving high current.
This process yields CNTs with lengths up to 50 microns.
 Laser Ablation
– In the laser ablation process, a pulsed laser vaporizes a
graphite target in a high-temperature reactor while an inert
gas is inserted into the reactor. Nanotubes develop on the
cooler surfaces of the reactor as the vaporized carbon
condenses.
 Other methods where CNTs are created:
- Chemical Vapor Decomposition
- Natural, incidental, and controlled flame environments
Page 5


Carbon Nanotubes
What are Carbon nanotubes.
Carbon nanotubes (CNTs) are allotropes
of carbon. These cylindrical carbon
molecules have interesting  properties
that make them potentially useful in
many applications in nanotechnology,
electronics, optics and other fields of
materials science, as well as potential
uses in architectural fields. They exhibit
extraordinary strength and unique
electrical properties, and are efficient
conductors of heat. Their final usage,
however, may be limited by their
potential toxicity.
How CNTs are made
 Arc discharge
– CNTs Can be found in the carbon soot of graphite
electrodes during an arc discharge involving high current.
This process yields CNTs with lengths up to 50 microns.
 Laser Ablation
– In the laser ablation process, a pulsed laser vaporizes a
graphite target in a high-temperature reactor while an inert
gas is inserted into the reactor. Nanotubes develop on the
cooler surfaces of the reactor as the vaporized carbon
condenses.
 Other methods where CNTs are created:
- Chemical Vapor Decomposition
- Natural, incidental, and controlled flame environments
Properties
 Strength
 Electrical
 Thermal
 Defects
 One-Dimensional Transport
 Toxicity