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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?