ABCs of Nano– a big picture of nanoscience,

nanotechnology and

nanoengineering

Dawen Li,

Shoieb Shaik,

Scott Wehby

June 22, 2015

Is It Small Enough?

Magic Nanoscale (1 to 100nm)

Why nanoscale?

• Novel material properties and phenomena only observed in the nanoscale world.

• Impact our daily life in all areas, such as healthcare, environment, food, and energy.

How Small Nano Is?

Nanoscience, Nanotechnology, and Nanoengineering

Increase of Surface Area by Cutting

Surface Area to Volume Ratio

26lS

3lV

lVS 6

Percentage of Surface Atoms (3D)

Nanoengineering with Surface Effect

Nanoparticle Size/Shape versus Color

Interaction at Nanoscale

• At macroscale, gravitational force is usually dominant.

• At nanoscale, atomic force, particularly electrical forces are generally governing.

Atomic Force for Imaging

Forces (van der Waals) between tip and surface depends on the tip height

Organized Structure from Self-Assembly

Electron Beam for Nanofabrication

Electron Beam for Imaging

Element Identification

Have Fun with Nano Products

Nonstick umbrella,

stain-free coating !

Strong adhesion tape !

Strong automobile

tires from

rubber/carbon

nanotube composite!

Review Questions

How small is small? What is the nanometer size?

Why Nano is a magic scale?

In your words describe the difference between nanoscience, nanotechnology, and nanoengineering.

What is the size effects in terms of surface to volume ratio and quantum confinement of nanoparticles?

Give some examples for application of nanopowders?

Can self-assembly happens at macroscale?

What tools can be used for nanofabrication and imaging?

List a few nano-products related to our daily life?