santu nanotechnology in-aerospace_applications
TRANSCRIPT
CONTENTS
Introduction
Why to use nano tech?
Why atomic level( nano scale)?
Nano materials
Nano tech applications
Applications in aerospace
Disadvantages
Conclusion
References
0.22 m
Fullerenes C60
22 cm 0.7 nm
10 millions times smaller
1 billion times smaller
WHAT IS NANOSCALE?
12,756 km
1.27 × 107 m 0.7 × 10-9 m
WHY ATOMIC LEVEL(NANO SCALE)?
Nano materials are intermediate in size between isolated atoms ,
molecules and bulk materials . At this scale, matter shows exceptional
properties.
1.Due to smallness, mass is small. Electro- magnetic forces become
dominant.
2.Increased surface-to-volume ratio.
3.Quantum confinement . Due to smallness, electrons are confined in
space . This results in changes in electronic and optical properties.
Regardless of whether we consider nano or bulk, its physical and
chemical properties depend a lot on its surface properties.
HOW DO YOU BUILD SOMETHING SO SMALL?
“Top-down approach” – building something by starting with a larger component and carving away material (like a sculpture).
In nanotechnology: patterning (using photolithography) and etching away material, as in building integrated circuits
“Bottom-up approach” – building something by assembling smaller components (like building a car engine).
In nanotechnology: self-assembly of atoms and molecules, as in chemical and biological systems
NANO MATERIALS
1.CARBON BASED
These nanomaterials are composed mostly of carbon, most
commonly taking the form of a hollow spheres, ellipsoids, or
tubes. Spherical and ellipsoidal carbon nanomaterials are
referred to as fullerenes, while cylindrical ones are called
nanotubes.
2.METAL BASED
These nanomaterials include quantum dots (closely packed
semiconductor crystal comprised of hundreds or thousands of
atoms, and whose size is on the order of a few nanometers to a
few hundred nanometers), nanogold, nanosilver and metal
oxides, such as titanium dioxide. Changing the size of quantum
dots changes their optical properties.
3. DENDRIMERS
These nanomaterials are nanosized polymers built from
branched units. The surface of a dendrimer has numerous chain
ends, which can be tailored to perform specific chemical
functions.
4.COMPOSITES
Composites combine nanoparticles with other nanoparticles or
with larger, bulk-type materials. Nanoparticles, such as
nanosized clays, are already being added to products ranging
from auto parts to packaging materials, to enhance mechanical,
thermal, barrier, and flame-retardant properties.
CARBON NANO TUBE (CNT)
CNTs also known as buckytubesare allotropes of carbon with a cylindrical nanostructure. Nanotubes have been constructed with length-to-diameter ratio of up to 132,000,000:1
carbon nanotube, the strongest and stiffest materials discovered till to date
Properties of Nano Tubes
• Strength :- Carbon nanotubes are the strongest and stiffest materials yet discovered in terms of tensile strength and elastic modulus respectively.
• Hardness:- The hardness of compressed SWNTs is 462–546 GPa, surpassing the value of 420 GPa for diamond
• Electrical:- In theory, metallic nanotubes can carry an electrical current density of 4 × 109 A/cm2 which is more than 1,000 times greater than metals such as copper.
• Thermal:- All nanotubes are expected to be very good thermal conductors along the tube, the temperature stability of carbon nanotubes is estimated to be up to 2800 °C in vacuum and about 750 °C in air.
WHAT DOES THE INDUSTRY WANT?
Materials that are:
Lighter
Stronger
More Durable(fatigue
and corrosion)
Resistant to Extreme
Conditions
Also interested in
materials that have
unique properties http://www.washingtonstatewire.com/admin/contentmanager/photos/1914090722%
20Boeing%20787.jpg
INDUSTRIAL/COMMERCIAL APPLICATIONS
Advanced Composites
Materials
Space Elevator
Aerospace Paint
Deicing Materials
Jet engine applications
http://www.backpackersguide.co.uk/images/plane-travel.jpg
ADVANCED COMPOSITE MATERIALS
Nano Fibers are laid out in
tape or fabric form
put in a mold under heat and
pressure.
The resin matrix flows over
nano fibers
Heat is removed and it
solidifies.
It can be formed into various
shapes. In some cases,
these fibers are wound
tightly to increase strength.
http://people.sabanciuniv.edu/~yusufm/research/composite.jpg
ADVANCED COMPOSITE MATERIALS
Traditionally used: Aluminum
metal
Aluminum made planes
heavier, consume more fuel
Fiberglass was first used in
the Boeing 707 passenger jet
in the 1950s, only 2% of the
structure.
Now , about one-third of the
structure of the commercial
planes uses composites
Composites are stronger
Composites makes aircrafts
lighter :~ 20% lighter
Fuel efficient
SPACE ELEVATOR
A space elevator is a proposed
type of space transportation
system .
Its main component is a ribbon-
like cable anchored to the
surface and extending into
space.
It is designed to permit vehicle
transport along the cable from a
planetary surface, such as the
Earth's, directly into space or
orbit, without the use of large
rockets.
BUCKY PAPER
Buckypaper is a thin sheet made from an aggregate of carbon nanotubes or carbon nanotube grid paper. Originally, it was fabricated as a way to handle carbon nanotubes.
Buckypaper is a macroscopic aggregate of carbon nanotubes (CNT), or "buckytubes". It owes its name to the buckminsterfullerene, the 60 carbon fullerene (an allotrope of carbon with similar bonding that is sometimes referred to as a "Buckyball" in honor of R. Buckminster Fuller).
Buckypaper is one tenth the weight yet potentially 500 times stronger than steel when its sheets are stacked to form a composite. It could disperse heat like brass or steel and it could conduct electricity like copper or silicon.
AEROSPACE PAINT AND SEALANT
Sealants to seal the structures
like fuel tanks, aerodynamic
sealing, and windshield
installation
PPG Aerospace chromate-free
de-paint/repaint process
includes a epoxy primer
Based on nanotechnology Environment friendly
Better adhesion
Corrosion resistant
http://www.aerospace-technology.com/contractors/paints/ppg-
aerospace/ppg-aerospace3.html
DEICING
http://news.bbc.co.uk/2/hi/8504734.stm
http://www.nano.org.uk/news/370/
•When a plane is in the air, icing
can occur
•plane’s performance suffers and
disasters can occur.
•Currently used techniques:
•use bleed air: heating the
surface with engine bleed
air
•mechanical boot: breaking
the bond between surface
and ice
• Issues:
•Too complex,
•too heavy
•draws too much power to
be effective
DEICING
Solution by scientists at Battelle, U. K, deicing fluid
is based on nano technology
weighs 1/100th of current ice protection systems
uses simple painting methods
can be applied to a variety of curved surfaces without needing a custom heater pad design.
How?
sprayed on planes prior to flight.
carbon nanotube coating is applied to surfaces then energize that coating using the plane’s on-board electrical system.
causes the nanotube coating to heat up, thus preventing ice from forming.
“Miniaturisation has obvious advantages in terms of
reducing the weight of cables and thus the overall
weight of the aircraft, helping to lower fuel costs. The
huge number of cables installed in a modern military
aircraft can have a significant impact on an its
weight.”
MILITARY APPLICATIONS Satellites weighing 15 tons or
more derive 1/3 of their weight from copper harnesses( an assembly of cables or wireswhich transmit signals or electrical power).
Boeing 747 uses up to 135 miles of copper wire that can weight more than 4000 pounds
Copper wires also oxidize and corrode, are susceptible to vibration fatigue, and create premature electronics failures due to overheating conditions.
Tiny carbon nanotubes (CNTs) are set to replace traditional copper wiring in aircraft applications.http://base1.googlehosted.com/base_media?q=http://www.capitolsupply.
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6imageid%3DCS8516813&size=20&dhm=fdfe56f1&hl=en
MILITARY APPLICATIONS
Conductive coating to be used on jet fighter canopies - clear bubbles that cover planes' cockpits
Coating will improve electromagnetic shielding and electrostatic discharge to prevent electronic disruption
http://upload.wikimedia.org/wikipedia/commons/thumb/c/c9/F-16_June_2008.jpg/800px-
F-16_June_2008.jpg
POSSIBILITIES FOR THE FUTURE
Nanotechnology may make it possible to manufacture lighter, stronger, and
programmable materials that
require less energy to produce than conventional material
and that promise greater fuel efficiency in land transportation, ships,
aircraft, and space vehicles.
The future of nanotechnology could very well include the use of
nanorobotics.
These nanorobots have the potential to take on human tasks as well as tasks
that humans could never complete. The rebuilding of the depleted ozone
layer could potentially be able to be performed.
There would be an entire nano surgical field to help cure everything from
natural aging to diabetes to bone spurs.
DRAWBACKS
Nano-particles can get into the body through the skin, lungs and digestivesystem, thus creating free radicals that can cause cell damage.
Once nano-particles are in the bloodstream, they will be able to cross theblood-brain barrier.
The most dangerous Nano-application use for military purposes is theNano-bomb that contain engineered self multiplying deadly viruses thatcan continue to wipe out a community, country or even a civilization.
CONCLUSION Even though nanotechnology is a fairly new area, it has incredible
potential and is a really exciting area to be involved in.
Many of the applications discussed here are speculative to say the least. However, they do not appear to violate the laws of physics.
The time-to-nanotechnology will be measured in decades, not years. While a few applications will become feasible in the next few years.
The time-to-nanotechnology is very sensitive to the level of effort expended. Resources allocated to developing nanotechnology are likely to be richly rewarded, particularly in the long term.
In recent years every country is showing a lot of interest regarding the space exploration programs . And, hence let's expect a faster growth of nanotechnology in aerospace-applications.
REFERENCES
1. http://science.howstuffworks.com/nanotechnology3.htm
2. http://en.wikipedia.org/wiki/Carbon_nanotube
3. http://en.wikipedia.org/wiki/nanotechnology
4. http://crnano.org/whatis.htm
5. http://www.wifinotes.com/nanotechnology/introduction-to-nanotechnology.htm
6. http://www.sciencedaily.com/releases/2010/05/100531082857.htm
7. http://www.technobuzz.com/applications of nano-technology in aerospace
8. http://http://education.mrsec.wisc.edu/104.htm