applications of cnt in automobiles

7/28/2019 Applications of Cnt in Automobiles

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BYK.G.JAYAANANTH

IV B.E. MECH


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a sheet of graphite rolledinto a cylindrical form

Constructed from

hexagonal rings of carbon have one layer or multiple

layers

have caps at the endsmaking them look like pills

Invented by Sumio Iijima,A Japanese scientist

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CNT: Rolling-up a graphene sheet to form a tube

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Schematicof a CNT

STM imageof CNT


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MWCNT Consist of 2 or more layers of

carbon

Tend to form unordered clumps

SWCNT Consist of just one layer of carbon

Greater tendency to align into

ordered bundles

Used to test theory of nanotubeproperties

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Chirality - twist of thenanotube

Described as the vectorR (n, m)

Armchair vector, Rvector, angle

=0, armchairnanotube

0< < 30, chiralnanotube

> 30, zigzagnanotube


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Diameter : SWCNT 0.6-1.8 nm;

MWCNT 5-100 nm.

Electrical : Metallic/semiconducting.

Density :1.33-1.40 g/cm3(Al: 2.7 g/cm3).

Tensile Strength : 45GPa (High strength steel

alloys:~2GPa).


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Current Carrying

Capacity : 109 A/cm2

(copper:106

A/cm2).

Heat Transmission : 6000W/mK

(Diamond:3320 W/mK).


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High Electrical Conductivity

High Tensile Strength

Highly Flexible, they can be bent considerably withoutdamage

High Thermal Conductivity

Low Thermal Expansion Coefficient

High Aspect Ratio (length = ~1000 x diameter)


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Carbon-carbon bonds are one of the strongestbond in nature

Carbon nanotube is composed of perfect

arrangement of these bonds Extremely high Youngs modulus

Material Youngs modulus (GPa)

Steel 190-210SWNT 1,000+


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Sport equipment

Aerospace

Automotive Fuel cells and batteries

Filtration


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Possibility of Reducing the body weight withimproved performance

Enhancing the structural & sensing propertiesby infusing the body with CNT epoxy


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This will add good electrical conductivityproperties and allow the windscreen andwindows to be connected to a heater and thecar to de-ice easily and quickly.


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Carbon nanotube carbon-carbon compositeshave already been developed for brakingapplications in aerospace industry. Thisensure further weight loss with improved

performance.


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Faster flywheelsCNTs could be used to make faster flywheels that

store more energy without shattering .A flywheel is like a battery in that it stores energy.But unlike a battery, this energy is mechanical and

stored via a wheel rotating at high speed (the fasterthe spin, the more energy it stores). Flywheels offercertain advantages over batteries. But a flywheel, ifspun too fast, can shatter because of the strengthlimits of its material. While Flywheels have seen onlylimited use in amusement rides, race cars and backup

power supplies, using CNTs could allow flywheels tobecome more prevalent in areas like publictransportation and hybrid cars.


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Better capacitors that replace batteries

CNT-Dielectric in capacitors more surfacearea more amount of charge

Less time required for charging

Can be used instantly in electric cars


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Italian motor giant Fiat has taken out a patent on the

use of carbon nanotubes in motor vehicle components,

to produce parts which have integrated sensor ability.

The patent mentions fuel tanks, pipes, seats and

bumpers as possible applications.

Much of the mass of a vehicle is taken up with

equipment and hence there is scope for carbon

nanotubes to be used to achieve massive weight

reduction.


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CNT is used as one of the most promisingnanotechnology materials with applications inautomotive industry.

CNT plays a pivotal role in weight reductionof the vehicle and thereby enhancing the fuelefficiency.

applications of cnt in automobiles

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