Big Wonders of a Small World

The biggest thing about me is being SMALL !

Seeing microscopic world…

But can we see ATOMS?

Richard FeynmanThere is plenty of

room at the bottom!

Scanning Tunneling Microscope

IBM Logo

So what’s nanotechnology?

The science of making useful

stuff that does work on the

nanometre length scale.

Kilometers (km)

Meter (m)

Centimeter (cm)

Nanometer (nm)

1 kilometer = 1000 m

1 meter= 100 cm

1 meter1000000000

1 nanometer =

Single Hair

Width = 0.1 mm

= 100 micrometers

= 100,000 nanometers !

1 nanometer = one billionth (10-9) meter

Nano car Nano ipod

Nano= dwarf

Nano everywhere…

Combination of all sciences

Why Nano?

Very high surface area

Chemical reactivity changes

Physical properties like colour changes.

All that glitters…

Ordinary Gold Nano gold

• Why?

– Different thicknesses of materials reflect and absorb light differently

History

Lycurgus Cup

Stained Glass

Disadvantages

1. Pollution

2. Wastage of energy

How nano particles can be made?

Top down

Bottom-Up

Applications of nanotechnology

In medicine

Quantum dots for Cancer detection

Early tumor

detection, studied in

mice

Drug Delivery

New Wonder Materials

Carbon Nanotubes

High conductivity

High tensile strength compared to steel.

Nanotechnology

Solar Cells

Pollution Prevention New fabrics

QUESTIONS