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**Adapted from Nanosense**

STEM ED/CHM NSTA 2008 How Big is a Nanometer? Adapted from Nanosense

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**www.umassk12.net/nano Educational materials (including today)**

Summer institute

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**Adapted from Nanosense**

This activity On our website Other useful nanoscience materials Other nanotechnology and power of ten resources:

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How Big is a Nanometer? 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 wires and tubes are x 10 atoms in diameter 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 all for now

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