intro to nano
TRANSCRIPT
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Powerpoint Templates
Introduction to Nanotechnology and Applications
Muhammad BilalCUST, Islamabad
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Introduction To Nanotechnology and Applications
What is Nanotechnology?
Significance of Nanoscale
Nanomaterials
Carbon Nanotubes
Other Applications
The Future
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What is Nanotechnology?
One of the problems facing nanotechnology
is the confusion about its definition.
Many definitions are based on size
limitations.
Some definitions include a reference to
molecular systems.
Another important criteria for the definition
is the requirement that the nanostructure is
man-made.
Exclusive nanoscale properties.
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What is Nanotechnology?
“The design, characterization, production, and application of structures, devices, and systems by controlled manipulation of size and shape at the nanometer scale (atomic, molecular, and macromolecular scale) that produces structures, devices, and systems with at least one novel/superior characteristic or property.”
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Introduction To Nanotechnology and Applications
What is Nanotechnology?
Significance of Nanoscale
Nanomaterials
Carbon Nanotubes
Other Applications
The Future
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Significance of Nanoscale:
Properties of materials at nanoscale can be
significantly different from bulk materials.
Reasons:
Relatively large no. of atoms on surface
makes them more chemically reactive.
Quantum effects can begin to dominate
the behavior of matter at the nanoscale.
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Introduction To Nanotechnology and Applications
What is Nanotechnology?
Significance of Nanoscale
Nanomaterials
Carbon Nanotubes
Other Applications
The Future
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Nanomaterials - Definition:
“Nanomaterials as those which have
structured components with at least one
dimension less than 100nm.”
Nanomaterial components can be classified
as:
One dimensional
Two dimensional
Three dimensional
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Nanomaterials – Construction Techniques:
Nanomaterials can be constructed by two
techniques:
1. Top Down Technique
Etching
Cutting etc.
2. Bottom Up Technique
Self-assembly
Positional assembly
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Introduction To Nanotechnology and Applications
What is Nanotechnology?
Significance of Nanoscale
Nanomaterials
Carbon Nanotubes
Other Applications
The Future
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Carbon Nanotubes:
Carbon Nanotubes are graphite sheets
rolled up in a tube form.
Depending on how the graphite sheet is
rolled decides the nanotube structure.
Types:
Single Walled Nano Tubes (SWNTs).
Multi Walled Nano Tubes (MWNTs).
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Carbon Nanotubes – Electrical Properties:
Carbon Nanotubes can be:
Metallic
Semiconducting
Electrical Properties depend upon:
Diameter
Chirality
Very High conductivity in metallic state.
Can carry billion amp per sq. centimeter.
Thermal conductivity 2 times better than
diamond.
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Carbon Nanotubes – Mechanical Properties:
Carbon Nanotubes are on of the strongest
materials.
Less structural defects.
Flexible.
Fracture resistant when bent severely.
Tensile strength of about 45 billion pascal.
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Carbon Nanotubes – Applications:
Field Emission.
EM Shielding.
Digital Integrated Circuits.
Mechanical Reinforcements.
Fuel Cells etc etc.
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Introduction To Nanotechnology and Applications
What is Nanotechnology?
Significance of Nanoscale
Nanomaterials
Carbon Nanotubes
Other Applications
The Future
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Other Applications – Current:
Cosmetics.
Composites.
Coatings and Surfaces.
Tougher tools.
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Other Applications– Short Term and Medium Term:
Paints.
Remediation.
Flat Panel Displays.
Batteries.
Water Purification.
Magnetic Materials.
Military Battle Suits.
Fuel Cells and Catalysts etc etc.
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Introduction To Nanotechnology and Applications
What is Nanotechnology?
Significance of Nanoscale
Nanomaterials
Carbon Nanotubes
Other Applications
The Future
