Today’s Agenda
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STEM ED/CHM Nanotechnology 2007. Today’s Agenda. Nano Size Me How big is a nanometer? Why Size Matters Nanomaterials are different Nano Sunscreen Ultraviolet light and nanoparticles Hands on activities for each. IBM chip. UMass Logo. TI mirror array. Nano Size Me. The Nano Scale.
Today’s Agenda
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STEM ED/CHM Nanotechnology 2007 Today’s Agenda • Nano Size Me • How big is a nanometer? • Why Size Matters • Nanomaterials are different • Nano Sunscreen • Ultraviolet light and nanoparticles • Hands on activities for each
IBM chip UMass Logo TI mirror array Nano Size Me
The Nano Scale Nano materials are typically 1 to 100 nanometers in size 1 nanometer = 1/1,000,000,000 meters How do such materials fit into the overall scale of objects in nature? And how big is a nanometer in terms of something basic?
We’ll use powers of ten • Handy way to express very large or very small numbers. • Easier than writing lots of zeros! 106 • reads 'ten to the 6' • is 1 followed by 6 zeros, 1,000,000 • is 1.0 with the point moved right by 6 places
Negative powers of 10 10-6 • reads 'ten to the minus 6' • is 1 divided by 106 , 1/1,000,000 • is 1.0 with the point moved left by six places, 0.000,001
How big is a meter? Width? ~2 meters Height? ~ 1 meter
101 meters = 10 meters Adapted from http://microcosm.web.cern.ch/Microcosm/P10/english/welcome.html
10-2 meters = 0.01m 1 centimeter = 1 cm
10-3 meters = 0.001 meters 1 millimeter = 1 mm Fly’s eye
10-4 meters = 0.0001 meters Fly’s eye as seen with electron microscope
10-5 meters = 0.00001 meters Red blood cells
10-6 meters = 0.000,001 meters Bacteria
10-7 meters = 0.000,000,1 meters Computer Chip details 10-7 meters
10-8 meters = 0.000,000,01 meters “Quantum corral” of iron atoms on a copper surface
3 nanometers 10-9 meters = 0.000,000,001 meters (1 nanometer = 1 nm) DNA
10-10 meters = 0.000,000,000,1 meters Carbon atom, with 6 electrons and a nucleus
10-14 meters = 0.000,000,000,000,01 meters Carbon nucleus, made up of 6 protons and 6 neutrons
10-15 meters = 0.000,000,000,000,001 meters 1 femtometer = 1 fm Proton (or neutron) composed of 3 quarks
So how big is a nanometer? Carbon atom diameter ~ 10-10 m 10 x 10-10 m = 10-9 m 1 nanometer ~ 10 atoms wide Nano films are a 1-100 x 10 atoms in thickness Nano particles are 1 to 100 x 10 atoms in diameter
The Size Me Challenge • Each team has an envelope containing • A 3 page list of powers of ten • 24 picture cards • Place each card next to the appropriate power of ten • Size matches will be approximate • Some matches will be easy, some will be hard!
