How Big is a Nanometer? IBM chipUMass LogoTI mirror array.
Presentation on theme: "STEM ED/CHM Nanotechnology 2007"— Presentation transcript:
1 STEM ED/CHM Nanotechnology 2007 Today’s AgendaNano Size MeHow big is a nanometer?Why Size MattersNanomaterials are differentNano SunscreenUltraviolet light and nanoparticlesHands on activities for each
3 The Nano ScaleNano materials are typically 1 to 100 nanometers in size1 nanometer = 1/1,000,000,000 metersHow do such materials fit into the overall scale of objects in nature?And how big is a nanometer in terms of something basic?
4 We’ll use powers of tenHandy way to express very large or very small numbers.Easier than writing lots of zeros!106reads 'ten to the 6'is 1 followed by 6 zeros, 1,000,000is 1.0 with the point moved right by 6 places
5 Negative powers of 10 10-6 reads 'ten to the minus 6' is 1 divided by 106 , 1/1,000,000is 1.0 with the point moved left by six places, 0.000,001
6 How big is a meter?Width?~2 metersHeight?~ 1 meter
21 So how big is a nanometer? Carbon atom diameter ~ m10 x m = m1 nanometer ~ 10 atoms wideNano films are a x 10 atoms in thicknessNano particles are 1 to 100 x 10 atoms in diameter
22 The Size Me Challenge Each team has an envelope containing A 3 page list of powers of ten24 picture cardsPlace each card next to the appropriate power of tenSize matches will be approximateSome matches will be easy, some will be hard!
24 Approximate sizes 1. Thickness of a penny 1 mm = 10-3 m 2. Oxygen atom nucleus1 femtometer =10-15 m3.Red blood cell diameter10 microns = 10-5 m4.Height of a 5 year old child1 m
25 Approximate sizes, 2 5. Proteinase enzyme 10-8 m = 10 nm (~ 100 atomic diameters)6.Dust mite10-4 m (0.1 mm)7.Wedding ring width1 cm = 10-2 m8.Length of amoeba10-44 m
26 Approximate sizes, 3 9. Width of electrical outlet cover 10-2 m = 10 cm10.Diameter of a ribosome10-8 m (10 nm)11.Thickness of sewing thread10-3 m = 1 mm12.Width of a water molecule10-9 m = 1 nm
27 Approximate sizes, 4 13. Width of a bacterium 10-6 m = 1 micron 14. Length of an apple seed10-2 m = 1 cm15.Diameter of a virus10-7 m = 100 nm16.Length of a business envelope10-1 m = 10 cm
28 Approximate sizes, 5 17. Diameter of a quarter 10-2 m = 1 cm 18. Length of human muscle cell10-4 m = 100 microns19.Diameter of a carbon nanotube10-8 m = 10 nm20.Length of a phone book10-1 m = 10 cm
29 Approximate sizes, 6 21. Height of an NBA player 100 m = 1 m 22. Diameter of nitrogen atom10-10 m23.Thickness of a staple10-3 m = 1 mm24.Wavelength of visible light10-7 m = 100 nm(Actually, 400 – 700)