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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

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Nano Size Me IBM chip UMass Logo TI mirror array

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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?

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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

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**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

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How big is a meter? Width? ~2 meters Height? ~ 1 meter

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101 meters = 10 meters Adapted from

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100 meter = 1 meter

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10-1 meters = 0.1 meters fly

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10-2 meters = 0.01m 1 centimeter = 1 cm

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10-3 meters = meters 1 millimeter = 1 mm Fly’s eye

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10-4 meters = meters Fly’s eye as seen with electron microscope

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10-5 meters = meters Red blood cells

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10-6 meters = 0.000,001 meters Bacteria

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10-7 meters = 0.000,000,1 meters Computer Chip details 10-7 meters

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10-8 meters = 0.000,000,01 meters “Quantum corral” of iron atoms on a copper surface

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**10-9 meters = 0.000,000,001 meters DNA (1 nanometer = 1 nm)**

3 nanometers DNA

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meters = 0.000,000,000,1 meters Carbon atom, with 6 electrons and a nucleus

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**10-14 meters = 0.000,000,000,000,01 meters Carbon nucleus,**

made up of 6 protons and 6 neutrons

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**Proton (or neutron) composed of 3 quarks**

meters = 0.000,000,000,000,001 meters 1 femtometer = 1 fm Proton (or neutron) composed of 3 quarks

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**So how big is a nanometer?**

Carbon atom diameter ~ m 10 x m = m 1 nanometer ~ 10 atoms wide Nano films are a x 10 atoms in thickness Nano particles are 1 to 100 x 10 atoms in diameter

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**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!

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That’s if for now …

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**Approximate sizes 1. Thickness of a penny 1 mm = 10-3 m 2.**

Oxygen atom nucleus 1 femtometer = 10-15 m 3. Red blood cell diameter 10 microns = 10-5 m 4. Height of a 5 year old child 1 m

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**Approximate sizes, 2 5. Proteinase enzyme 10-8 m = 10 nm**

(~ 100 atomic diameters) 6. Dust mite 10-4 m (0.1 mm) 7. Wedding ring width 1 cm = 10-2 m 8. Length of amoeba 10-44 m

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**Approximate sizes, 3 9. Width of electrical outlet cover**

10-2 m = 10 cm 10. Diameter of a ribosome 10-8 m (10 nm) 11. Thickness of sewing thread 10-3 m = 1 mm 12. Width of a water molecule 10-9 m = 1 nm

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**Approximate sizes, 4 13. Width of a bacterium 10-6 m = 1 micron 14.**

Length of an apple seed 10-2 m = 1 cm 15. Diameter of a virus 10-7 m = 100 nm 16. Length of a business envelope 10-1 m = 10 cm

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**Approximate sizes, 5 17. Diameter of a quarter 10-2 m = 1 cm 18.**

Length of human muscle cell 10-4 m = 100 microns 19. Diameter of a carbon nanotube 10-8 m = 10 nm 20. Length of a phone book 10-1 m = 10 cm

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**Approximate sizes, 6 21. Height of an NBA player 100 m = 1 m 22.**

Diameter of nitrogen atom 10-10 m 23. Thickness of a staple 10-3 m = 1 mm 24. Wavelength of visible light 10-7 m = 100 nm (Actually, 400 – 700)

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