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Todays 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 STEM ED/CHM Nanotechnology 2007

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Nano Size Me IBM chipUMass LogoTI 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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Well use powers of ten Handy way to express very large or very small numbers. Easier than writing lots of zeros! 10 6 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 reads 'ten to the minus 6' is 1 divided by 10 6, 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? ~ 1 meter ~2 meters Width? Height?

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10 1 meters = 10 meters Adapted from

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10 0 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 Flys eye 1 millimeter = 1 mm

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10 -4 meters = meters Flys 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 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 (1 nanometer = 1 nm) DNA 3 nanometers

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

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meters = 0.000,000,000,000,01 meters Carbon nucleus, made up of 6 protons and 6 neutrons

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

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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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Thats if for now …

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1.Thickness of a penny 1 mm = m 2.Oxygen atom nucleus 1 femtometer = m 3.Red blood cell diameter 10 microns = m 4.Height of a 5 year old child 1 m Approximate sizes

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5.Proteinase enzyme m = 10 nm (~ 100 atomic diameters) 6.Dust mite10 -4 m (0.1 mm) 7.Wedding ring width 1 cm = m 8.Length of amoeba m Approximate sizes, 2

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9.Width of electrical outlet cover m = 10 cm 10.Diameter of a ribosome m (10 nm) 11.Thickness of sewing thread m = 1 mm 12.Width of a water molecule m = 1 nm Approximate sizes, 3

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13.Width of a bacterium m = 1 micron 14.Length of an apple seed m = 1 cm 15.Diameter of a virus m = 100 nm 16.Length of a business envelope m = 10 cm Approximate sizes, 4

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17.Diameter of a quarter m = 1 cm 18.Length of human muscle cell m = 100 microns 19.Diameter of a carbon nanotube m = 10 nm 20.Length of a phone book m = 10 cm Approximate sizes, 5

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21.Height of an NBA player 10 0 m = 1 m 22.Diameter of nitrogen atom m 23.Thickness of a staple m = 1 mm 24.Wavelength of visible light m = 100 nm (Actually, 400 – 700) Approximate sizes, 6

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