nano presentation
TRANSCRIPT
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TECHNOLOGY
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Milestone
• 1959 R. Feynman Delivers “ Plenty of Room at the
Bottom”
• 1974 First Molecular Electronic Device Patented
• 1981 Scanning Tunneling Microscopic (STM)
• 1986 Atomic Force Microscopy (AFM) Invented
• 1987 First single-electron transistor created
• 1991 Carbon Nanotubes Discovered
• 2000 US Launches National Nanotechnology
Initiative
• 2002. 01 ITRI Nano Research Center Established
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What is a Nanomaterial?
• Nanomaterials are commonly defined as
materials with an average grain size less
than 100 nanometers.
• One billion nanometers equals one meter
• Nanopowder
– Building blocks (less than 100 nm in
diameter)
for more complex nanostructures.
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• Nanotechnology is the art and science of manipulating
matter at the nanoscale (down to 1/100,000 the width of a
human hair) to create new and unique materials and
products...with enormous potential to change society.
• 1 nanometer (nm) = 1 billionth of a meter.
• Human exposure and accommodation nothing new.
• We cannot assume that nanomaterials are the same as
their bulk counterpart...but also cannot assume that they
are more toxic.
• Every particle should be tested on a case-by-case basis.
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Different types of Nanomaterial
• Nanopowder
– Building blocks (less than 100 nm in diameter)
for more complex nanostructures.
• Nanotube
– Carbon nanotubes are tiny strips of graphite
sheet rolled into tubes a few nanometers in
diameter and up to hundreds of micrometers
(microns) long.
– The Strongest Material
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Nano Powders:
• Advanced nanophase materials synthesized from
nanopowders have improved properties.
• Such as stronger and less breakable ceramics.
They may conduct electrons, ions, heat, or light
more readily than conventional materials.
• Exhibit improved magnetic and catalytic properties.
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• Some nanotechnology has been around for a
while: nano-size carbon black particles (a.k.a.
high-tech soot) have gone into tires for 100
years as a reinforcing additive.
• A vaccine, which often consists of one or more proteins with nanoscale dimensions. • The nanoworld is a weird borderland
between the realm of individual atoms and molecules (where quantum mechanics rules)
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Nanotech—deals with materials and systems
having these key properties: they have at least one
dimension of about one to 100 nanometers, they
are designed through processes that exhibit
fundamental control over the physical and chemical
attributes of molecular-scale structures, and they
can be combined to form larger structures. May
boast superior electrical, chemical, mechanical or
optical properties —at least in theory.
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New tools capable of imaging and manipulating single
molecules or atoms have ushered in the new age of
nano. The icons of this revolution are scanning probe
microscopes—the scanning tunneling microscope and
the atomic force microscope, among others—capable of
creating pictures of individual atoms or moving them from
place to place.
Varied approaches to fabricating nanostructures have
emerged in the nanoworld.
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Approaches to fabricating nanomaterials:
• Top-down – Breaking down matter into more basic
building blocks. Frequently uses chemical or thermal
methods, patterning (using photolithography) and
etching away material, as in building integrated circuits
• Bottoms-up – Building complex systems by combining
simple atomic-level components, self-assembly of atoms
and molecules, as in chemical and biological systems
Bottom-up approach frequently used when constructing
nanomaterials for use in medicine
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• Carbon nanotubes are hollow cylinders made of sheets
of carbon atoms and can be divided into single-walled
carbon nanotubes (SWNTs) and multi-walled carbon
nanotubes (MWNTs).
• SWNTs possess a cylindrical nanostructure with a high
aspect ratio, formed by rolling up a single graphite sheet
into a tube.
• SWNTs are, typically, a few nanometers in diameter and
up to several microns long.
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General areas of application are as follows:
• manufacturing and industrial processes
(catalysts, filters, and so on);
• transport, aeronautical and space
engineering;
• biomedicine, pharmaceuticals, targeted
drug delivery;
• imaging, sensors, monitoring;
• environmental management;
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General areas of application are as follows:
• food technology, additives, packaging;
• materials, surfaces, textiles, fabrics;
• sports and entertainment technology;
• cosmetics, fragrances, toiletries;
• Information and Communications Technology
(ICT);
• Intelligence, surveillance and defence.
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Examples of specific products containing
engineered nanoparticles (such as carbon
nanotubes) that are already on the consumer
market are: textiles, sportswear, golf balls, tennis
rackets, plastic mouldings in vehicles and scratch
resistant paint, car tyres, sunscreen and certain
electronic consumer goods. Many other products,
including nano catalysts and nano-filters, are
available to manufacturers.
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Several synthesis methods are used to produce
carbon nanotubes. The three most commonly used
methods are the arc discharge, laser ablation, and
chemical vapor deposition (CVD) techniques. While
the arc and laser methods can produce large
quantities of carbon nanotubes they lead to resilient
contaminants, including pyrolytic and amorphous
carbon, that are difficult to remove from the sample.
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New fabrication methods such as high pressure
carbon monoxide (HiP CO), have created
commercial supplies of carbon nanotubes with
more than 90% purity with competitive prices. In
contrast, the less scalable CVD process yield
carbon nanotubes with defined properties. This
method produces both multiwalled and single-
walled nanotubes depending on the temperature.
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