In this pptx you can learn about following topics: Carbon nanotubes, Nanotubes, Carbon, Sumio Iijima, Nanotechnology, CNT, cnt, Ctubes, nanometers, Honeycomb, Tubular, Graphene, CNTs, SWCNT, MWCNT, Graphene layer, Properties of CNT, properties of carbon nanotubes, properties of carbon nanotubes, Applications of CNTs, Applications of Carbon nanotubes, Structural composition of carbon nanotubes, CNTs fibers and fabrics, CNTs air and water filtration, CNTs energy storage.

1. CARBON
NANO-TUBES

2. Introduction
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In June, 1991, Sumio Iijima found an extremely
thin needle-like material when examining carbon
materials under an electron microscope. He
named these materials “carbon nanotubes” . The
name has been widely accepted now. Carbon
nanotubes have attracted a lot of researchers in a
wide range of fields from academia to industry, not
only because of their uniqueness when compared
with conventional materials, but also because they
are very promising materials in nanotechnology in
future technology.

3. What is CNT ?
• Carbon nanotubes are large molecules of pure carbon
that are long and thin and shaped like tubes, about 1-3
nanometers in diameter, and hundreds to thousands of
nanometers long.
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4. Structure of CNT
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The simplest carbon nanotube is composed of a
single sheet of a honeycomb network of carbon
atoms called Graphene, it is rolled up seamlessly
into a tubular form.

5. Types of CNTs
• The two main types of CNT are the single and multi-
walled, but there are some other rare types such as
fullerite, torus, and nanoknot.
1. Single-walled CNT (SWCNT)
2. Multi-walled CNT (MWCNT)
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6. Single-walled CNT
• A single-walled carbon nanotubes (SWCNTs) can be
considered to be formed by the rolling of a single layer of
graphite (called a graphene layer) into a seamless cylinder.
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7. Multi-Walled CNTs
• Multi-walled carbon nanotubes (MWCNTs) can be considered
as a collection of concentric SWCNTs (consist of multiple layers
of graphite rolled in on themselves to form a tube shape) with
different diameters.
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8. Properties & Applications of CNTs
 CNTs Thermal Conductivity
CNTs have outstanding heat conductivity, electrical conductivity,
and mechanical properties and due to which they have may
applications such as in sensing and actuating devices, nanoscale
molecular electronics, or as reinforcing additive fibers in functional
composite materials.
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9.  Elasticity
Tensile strength of CNTs is about 200 GigaPascal and
therefore CNTs can be stretched up to 20% of there rest length and
can be bent and even tied a knot with no resulting effect. Due to
this ability nanotubes can withstand fast moving bullets
by rebounding their force. The simulations also suggest that
nanotubes are resistant to damage by repeated ballistic
impacts, which is crucial if they are to be used in body
armour.
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10.  CNTs Structural Composites
The superior properties of CNTs
also include mechanical properties, such as strength, toughness,
and stiffness. Young’ Modulus of CNTs is 1 Tera Pascal which
makes CNTs 10 times more stronger than steel. Due to this ability
the composite material containing CNTs are being used in Sporting
goods like Bicycle frames, tennis rockets and hockey sticks etc.
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11.  CNTs Fibers and Fabrics
Recently, fibers spun from pure
CNTs have been demonstrated
and are experiencing rapid
development, together with CNT
composite fibers. Such super
strong fibers will have several
applications such as woven
fabrics and textiles, transmission
line cables, and body and vehicle
armor. CNTs are also being
employed in order to make
textiles stain resistant.
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12.  CNTs Air and Water Filtration
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Several corporations and researchers have already developed
CNT-based water and air filtration devices.

13.  CNTs Energy Storage
The intrinsic properties of CNTs make
them the preferred material for use as electrodes in capacitors and
batteries — two technologies of fast-growing significance. CNTs
possess good electrical conductivity, an extremely high surface
area (~1000 m2/g), and most importantly, their linear geometry
makes their surface very accessible to the electrolyte.
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14. References
• https://www.azonano.com/article.aspx?ArticleID=1381
• https://www.hindawi.com/journals/jchem/2013/676815/
• https://www.balzan.org/en/prizewinners/sumio-iijima/the-
discovery-of-carbon-nanotubes-iijima
• https://www.sciencedirect.com/science/article/pii/S187853521000
1747#:~:text=The%20structure%20of%20CNT%20consists,et%20al
.%2C%201999).
• https://www.nanowerk.com/nanotechnology/introduction/introdu
ction_to_nanotechnology_22.php
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