inculcate 2013 ppt final
DESCRIPTION
Big wonders of a small worldTRANSCRIPT
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Big Wonders of a Small World
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The biggest thing about me is being SMALL !
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Seeing microscopic world…
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But can we see ATOMS?
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Richard FeynmanThere is plenty of
room at the bottom!
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Scanning Tunneling Microscope
IBM Logo
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So what’s nanotechnology?
The science of making useful
stuff that does work on the
nanometre length scale.
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Kilometers (km)
Meter (m)
Centimeter (cm)
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Nanometer (nm)
1 kilometer = 1000 m
1 meter= 100 cm
1 meter1000000000
1 nanometer =
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Single Hair
Width = 0.1 mm
= 100 micrometers
= 100,000 nanometers !
1 nanometer = one billionth (10-9) meter
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Nano car Nano ipod
Nano= dwarf
Nano everywhere…
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Combination of all sciences
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Why Nano?
Very high surface area
Chemical reactivity changes
Physical properties like colour changes.
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All that glitters…
Ordinary Gold Nano gold
• Why?
– Different thicknesses of materials reflect and absorb light differently
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History
Lycurgus Cup
Stained Glass
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Disadvantages
1. Pollution
2. Wastage of energy
How nano particles can be made?
Top down
Bottom-Up
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Applications of nanotechnology
In medicine
Quantum dots for Cancer detection
Early tumor
detection, studied in
mice
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Drug Delivery
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New Wonder Materials
Carbon Nanotubes
High conductivity
High tensile strength compared to steel.
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Nanotechnology
Solar Cells
Pollution Prevention New fabrics
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QUESTIONS