This document discusses carbon nanotubes. It defines a carbon nanotube as a tube-shaped material made of carbon that has a diameter on the nanometer scale, which is about 10,000 times smaller than a human hair. Carbon nanotubes are categorized as either single-walled or multi-walled. The document lists several applications of carbon nanotubes, including in thermal conductivity, energy storage, structural materials, fibers, biomedicine, filtration, electronics, and bioengineering. Several synthesis methods for carbon nanotubes are also described, such as arc discharge, laser ablation, chemical vapor deposition, and ball milling.
2. CARBON NANOTUBES
A carbon nanotube is a tube-shaped
material, made of carbon, having a
diameter measuring on the nanometer
scale. A nanometer is one-billionth of a
meter, or about 10,000 times smaller than
a human hair. CNT are unique because the
bonding between the atoms is very strong
.
3. TYPES OF CNT
There are many different types of carbon
nanotubes, but they are normally
categorized as either single-walled (SWNT)
or multi-walled nanotubes (MWNT). A
single-walled carbon nanotube is just like a
regular straw. It has only one layer, or wall.
5. APPLICATION OF CNT
•CNTs Thermal Conductivity
•CNTs Energy Storage
•CNTs Structural Applications
•CNTs Fibers & Fabrics
•CNTs Biomedical Applications
•CNTs Air & Water Filtration
6. ELECTRONICS APPLICATIONS
Carbon Nanotubes (CNTs) and their compounds
exhibit extraordinary electrical properties for organic
materials, and have a huge potential in electrical
and electronic applications such as photovoltaics,
sensors, semiconductor devices, displays,
conductors, smart textiles and energy conversion
devices (e.g., fuel cells, harvesters and batteries).
7. BIOMEDICAL APPLICATIONS
Carbon nanotubes (CNTs) represent one of the
most studied allotropes of carbon. The unique
physicochemical properties of CNTs make them
among prime candidates for numerous applications
in biomedical fields including drug delivery, gene
therapy, biosensors, and tissue engineering
applications
8. PROPERTIES OF CNT
CNTs are Highly Flexible
CNTs are Very Elastic
CNTs have High Thermal Conductivity
CNTs are Good Electron Field Emitters
CNTs have High Electrical Conductivity
CNTs have Very High Tensile Strength
10. BALL MILLING METHOD
A ball mill is a type of grinder used to grind and
blend materials for use in mineral dressing
processes, paints, pyrotechnics, ceramics and
selective laser sintering. It works on the principle of
impact and attrition: size reduction is done by
impact as the balls drop from near the top of the
shell
11. ARC DISCHARGE METHOD
A method for the synthesis of
carbon nanotubes where a direct-
current arc voltage is applied across
two graphite electrodes immersed in
an inert gas such as He.
12. LASER ABLATION METHOD
The laser ablation method yields around 70% and
produces primarily single-walled carbon nanotubes
with a controllable diameter determined by the
reaction temperature. However, it is more
expensive than either arc discharge or chemical
vapor deposition
13. CHEMICAL VAPOUR DEPOSITION (CVD)
The advantages of the CVD process were low
power input, lower temperature range, relatively
high purity and, most importantly, possibility to
scale up the process. This method can produce
both MWNTs and SWNTs depending on the
temperature, in which production of SWNTs will
occur at a higher temperature than MWNTs.
