By Souradipta Chowdhury
3rd
Year ECE Roll:18700312107
Introduction To Nanotechnology
Basics of Nanoparticles
Surface to volume comparison
Introduction to Nanotube
Synthesi...
Nanotechnology
• The study of control of matter on
an atomic and molecular scale.
– Deals with structures the size of
100n...
Key Dimensions in Nanometers
• An atom is about 0.3 nm in size.
• DNA double helix has a diameter
of about 2 nm.
• Typical...
Properties of Nanoparticles
• Materials reduced to the nano scale can show
different properties compared to what they
exhi...
Model of Surface-to-Volume
Comparisons
• Neglecting spaces between the smaller boxes, the volumes of the
box on the left a...
Carbon Nanotube
Great potential for storage memory (116 Gb/cm2
)
Small size offers faster switching speeds (100GHz )
and low power
Easy to...
Arc Discharge:
Two carbon rods are placed
end to end with a separation
distance of about 1mm and
are used as electrodes
In...
Producing nanotubes in
high yield depends upon
the uniformity in the
plasma arc, and also
upon the temperature of
the depo...
Laser Ablation :
A pulsed or continuous laser is
used to vaporize a graphite target
placed in an oven at 1200ºC
The oven i...
From the initial clusters, tubular molecules grow into SWNT.
This stops when the catalyst particles (which also condense) ...
Types of Nantube
Depending on “WALL” Nanotube has TWO types
Single Wall CNT (SWCNT)
Multi Wall CNT(MWCNT)
Architecture behind it:
• Chiral Vector: A carbon nanotube can be viewed as a rolled
graphene sheet along its circumferent...
– Armchair
– Zig-Zag
– Chiral Armchair
θ= 30°
(m=n)
Zig-Zag
θ= 0°
(m=0)
Chiral
0° <θ < 30°
(n>m)
Nano fiber
• A nano fiber is a
continuous fiber which has
a diameter in the range of
billionths of a meter.
• The smallest...
Electrospinning to Make
Nanofibers
• An electric field pulls
on a droplet of
polymer solution at
the tip of the syringe
an...
Electrospinning a Polymer Solution
to Produce Nanofibers
• This picture shows
the actual spinning
of a solution made of
th...
Unique Properties of Nanofibers
• Size: nano fibers are very small which allows them to
be used in very small places.
• Su...
Uses of Nano fibers
• Strength: Reinforced
composites by nano
fibers, twisted in
yarns.
here nano fibers are spun
into yar...
Uses of Nanofibers… continued.
• Encapsulation: Drug
delivery, Scaffolds
for growing cells,
Agriculture.
– Water filtratio...
Uses of Nanofibers… continued.
• Structure: Fuel cell, Micro/Nano
electronic devices
– Nanofibers can be used to
greatly d...
Uses of Nanofibers… continued.
• Light Weight: Produce
Solar sails in space,
Aircraft wings, Bullet-
proof vests.
– New br...
Products Currently on the Market
Using Nanotechnology
• Over 600 nanotech enabled
products are on the market
today. Some e...
Applications:
• Electronics:
– Nano Transistors
– Nano Diodes
– OLED (Organic Light Emitting Diode)
– Plasma Displays
– Qu...
Resources
1. Micro manufacturing and Nanotechnology by
N.P Mahalik (Springer)
2. Nanotechnology and Nanotubes
by Benjamin ...
Nanotechnology about nanotube and nanofibers
Nanotechnology about nanotube and nanofibers
Nanotechnology about nanotube and nanofibers
of 29

Nanotechnology about nanotube and nanofibers

nanotube and nanofiber synthesizing process and architecture best presentation of all
Published on: Mar 3, 2016
Published in: Engineering      
Source: www.slideshare.net


Transcripts - Nanotechnology about nanotube and nanofibers

  • 1. By Souradipta Chowdhury 3rd Year ECE Roll:18700312107
  • 2. Introduction To Nanotechnology Basics of Nanoparticles Surface to volume comparison Introduction to Nanotube Synthesizing Processes Architecture behind Nanotubes Basics of Nano fibers Synthesis of Nano fiber Uses of Nano tubes and Fibers Applications in present market Contents
  • 3. Nanotechnology • The study of control of matter on an atomic and molecular scale. – Deals with structures the size of 100nanometers or smaller (1 nm = 1/1,000,000,000 m or 10-9 m). – Involves engineering on a small scale to create smaller cheaper lighter and faster devices that can do more things with less raw materials.
  • 4. Key Dimensions in Nanometers • An atom is about 0.3 nm in size. • DNA double helix has a diameter of about 2 nm. • Typical spacing between 2 carbon atoms in a molecule is 0.12 – 0.15 nm.
  • 5. Properties of Nanoparticles • Materials reduced to the nano scale can show different properties compared to what they exhibit on the macro scale. – Opaque substances become transparent (copper); stable materials turn combustible (aluminum); semiconductor become conductors (silicon); and solids turn to liquids at room temperature (gold). – Nanoparticles tend to be more chemically reactive than their ordinary state
  • 6. Model of Surface-to-Volume Comparisons • Neglecting spaces between the smaller boxes, the volumes of the box on the left and the boxes on the right are the same but the surface area of the smaller boxes added together is much greater than the single box. Single Box Ratio 6 m2 1 m3 = 6 m-1 Smaller Boxes Ratio 12 m2 1 m3 = 12 m-1
  • 7. Carbon Nanotube
  • 8. Great potential for storage memory (116 Gb/cm2 ) Small size offers faster switching speeds (100GHz ) and low power Easy to fabricate: standard semiconductor process Nonvolatile nature: no need to refresh. Faster than SRAM, denser than DRAM, cheaper than flash memory. Have an almost unlimited life, resistant to radiation
  • 9. Arc Discharge: Two carbon rods are placed end to end with a separation distance of about 1mm and are used as electrodes In an enclosed volume of usually an inert gas (He, Ar) at a low p1ressure (50-70 mbar), a current of 50-100 A, driven by 20 V creates a high temperature arc between the electrodes. Conti…….. Nanotube : Synthesis
  • 10. Producing nanotubes in high yield depends upon the uniformity in the plasma arc, and also upon the temperature of the deposit on the second carbon electrode The discharge vaporizes one rod forming a rod shaped deposit on the other.
  • 11. Laser Ablation : A pulsed or continuous laser is used to vaporize a graphite target placed in an oven at 1200ºC The oven is filled with an argon gas which is used to keep the pressure at 500 Torr. A very hot vapor plume forms, which then expands and cools rapidly. As the vaporized species cools, small carbon molecules and atoms condense to form larger clusters. Conti…….
  • 12. From the initial clusters, tubular molecules grow into SWNT. This stops when the catalyst particles (which also condense) become too large, or when the conditions have cooled enough where carbon can no longer diffuse through or over the surface of the catalyst particles. The SWNT’s formed in this case are bundled together by Van der Waals forces.
  • 13. Types of Nantube Depending on “WALL” Nanotube has TWO types Single Wall CNT (SWCNT) Multi Wall CNT(MWCNT)
  • 14. Architecture behind it: • Chiral Vector: A carbon nanotube can be viewed as a rolled graphene sheet along its circumferential direction, is determined by its chiral vector. • The chiral vector is defined as
  • 15. – Armchair – Zig-Zag – Chiral Armchair θ= 30° (m=n) Zig-Zag θ= 0° (m=0) Chiral 0° <θ < 30° (n>m)
  • 16. Nano fiber • A nano fiber is a continuous fiber which has a diameter in the range of billionths of a meter. • The smallest nano fibers made today are between 1.5 and 1.75 nanometers. • At the right a human hair (80,000 nanometers) is place on a mat of nano fibers
  • 17. Electrospinning to Make Nanofibers • An electric field pulls on a droplet of polymer solution at the tip of the syringe and pulls out a small liquid fiber. It is pulled thinner and thinner as it approaches the collection plate. Electrospinning Apparatus
  • 18. Electrospinning a Polymer Solution to Produce Nanofibers • This picture shows the actual spinning of a solution made of the polymer PEO (polyethylene oxide) dissolved in water. • The resulting fiber is collected below on a grounded plate.
  • 19. Unique Properties of Nanofibers • Size: nano fibers are very small which allows them to be used in very small places. • Surface-to-volume ratio: nano fibers have a huge surface area compared to their volume. • High surface area • Support: Provides huge structural support. Fibroblast cells grown on nano fibers.
  • 20. Uses of Nano fibers • Strength: Reinforced composites by nano fibers, twisted in yarns. here nano fibers are spun into yarns.
  • 21. Uses of Nanofibers… continued. • Encapsulation: Drug delivery, Scaffolds for growing cells, Agriculture. – Water filtration: a chelating compound has been encapsulated in nanofibers.
  • 22. Uses of Nanofibers… continued. • Structure: Fuel cell, Micro/Nano electronic devices – Nanofibers can be used to greatly decrease the size of a fuel cell while increasing the electrical output.
  • 23. Uses of Nanofibers… continued. • Light Weight: Produce Solar sails in space, Aircraft wings, Bullet- proof vests. – New breathable bullet- proof vest: Nomex Nanofibers
  • 24. Products Currently on the Market Using Nanotechnology • Over 600 nanotech enabled products are on the market today. Some examples are: – Carbon nanotubes in bike frames and tennis rackets make the products stronger and lighter This bike frame weights 2.75 pounds
  • 25. Applications: • Electronics: – Nano Transistors – Nano Diodes – OLED (Organic Light Emitting Diode) – Plasma Displays – Quantum Computers • Energy: – Batteries – Fuel Cells – Solar Cells
  • 26. Resources 1. Micro manufacturing and Nanotechnology by N.P Mahalik (Springer) 2. Nanotechnology and Nanotubes by Benjamin Fry and Kouras' Kelantan 3. nanotechnews.com 4. electro spun. BlogSpot 5. www.nnin.org 6. www.nano.gov.us

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