NANOSCIENCE

Information about NANOSCIENCE

Published on August 25, 2009

Author: ankush85

Source: authorstream.com

Content

NANOSCIENCEThinking Small to Do Big Things : NANOSCIENCEThinking Small to Do Big Things Presented by Ankush Resources and Credits : Resources and Credits University of Wisconsin at Madison – Materials Research Science and Engineering Center http://www.mrsec.wisc.edu/nano This site includes a wealth of visuals and information. It is also the source of the “Exploring the Nanoworld” Kit you will be using. Resources and Credits : Resources and Credits Northwestern University – Institute for Nanotechnology Nanotechnology/Nanoscience – Materials World Module (Teacher Edition, Beta Version) c. 2003 Alyson Whitney (Chemistry graduate student)– provided several of the PowerPoint slides you will see Hilary Godwin (Chemistry Chair) donated the materials for activities C and E Korin Wheeler (Chemistry graduate student)- provided additional information from the Nanotechnology Module Slide 4: cm mm mm nm 10-2 10-3 10-6 10-4 10-5 10-7 10-8 10-9 (m) Hair 100 mm Raindrop 1 mm What Is A Nanometer? Slide 5: 80 100 60 40 20 (nm) Gold Particles 13 nm & 50 nm Flu Virus 100 nm 1 Bacteriophage 60-70 nm DNA Diameter = 2 nm Now Entering The NANO-ZONE Powers of Ten : Powers of Ten Activity A – Exploring Powers of Ten from “Exploring the Nanoworld” LEDs in Traffic Lights http://www.powersof10.com Slide 7: Nanotechnology Is Not A New Phenomenon The Lycurgus Cup: 4th Century A.D. The British Museum. http://www.thebritishmuseum.ac.uk/ (March 2004) Image of silver/gold nanoparticle in the Lycurgus cup Green = Reflected Light Red = Transmitted Light Why Is NanoScience Popular Now : Why Is NanoScience Popular Now Richard Feynman’s Presentation – Dec 29, 1959 “There is plenty of room at the bottom” “In the year 2000, when they look back at this age, they will wonder why it was not until the year 1960 that anybody began seriously to move in this direction.” http://www.zyvex.com/nanotech/feynman.html Feynman Prizes “There’s Plenty of Room at the Bottom” : “There’s Plenty of Room at the Bottom” Why Is NanoScience Popular Now : Why Is NanoScience Popular Now Development of Tools – “Seeing” and “Manipulating” at the Nano-Level STM (Scanning Tunneling Microscopy) AFM (Atomic Force Microscopy) Activity B – Probing Surfaces Activity B - Probing Surfaces : Activity B - Probing Surfaces Activity B – Probing Surfaces : Activity B – Probing Surfaces Which One? : Which One? Seeing Atoms : Seeing Atoms Seeing Atoms : Seeing Atoms http://www.almaden.ibm.com/vis/stm/catalogue.html Changing Properties by Changing Size : Changing Properties by Changing Size Activity C – Directions (see written directions) Activity D – Directions (see written directions – this activity is actually a demonstration done by the workshop leaders) Discussion Slide 17: Why Is Nanotechnology So Cool? Bulk Gold mp = 1064° C Color = gold 1 nm gold particles mp = 700 °C lmax = 420 nm Color = brown-yellow 20 nm gold particles mp = ~1000 °C lmax = 521 nm Color = red 100 nm gold particles mp = ~1000 °C lmax = 575 nm Color = purple-pink Applications : Applications Sunscreens Diagnostics Automobile Converters Self-Cleaning Windows Activity E - Nanolithography : Activity E - Nanolithography Background Directions Discussion – series vs parallel fabrication Applications – computer chips Slide 20: If you could make one slice per minute, how long would it take you to cut a dime into 1 nm slices? 1,000,000,000 seconds or 31.7 years Nanofabrication: Top-Down vs. Bottom-Up If you could add one atom per second, how long would it take to create a 13 nm gold (Au) colloid? 540,000 seconds per colloid or 6,250,000,000 days to make a billion colloidal nanoparticles Slide 21: Nanofabrication: Serial vs. Parallel Serial Fabrication Parallel Fabrication Nanoscience Nanoscience Nanoscience Nanoscience Slide 22: 1. Clean Substrate Drop Nanosphere Solution 3. Dry 6. Image Nanostructures 5. Remove Nanospheres 4. Deposit Metal Nanosphere Lithography Technique 5000 nm Slide 23: 5000 nm 125 nm Nanosphere Lithography Technique Nanosphere (Diameter = 400 nm) Hole in Mask Atomic Force Microscope Image Slide 24: Nanosphere Diameter = 400 nm Aggregated Colloids Diameter = 100 nm Single Gold (Au) Colloid Diameter = 13 nm Gold (Au) Atom Diamter = 0.32 nm Size Scale Comparison Activity E Procedure : Activity E Procedure Build a triangular template using craft sticks. Use the masking tape to fasten the sticks at the corners. Cut a piece of contact paper approximately 5” x 5” and place sticky side up flat on the counter top. You may also want to secure it in place with some masking tape. Place the template onto the contact paper and pack the “nanospheres” into the template. Activity E Procedures : Activity E Procedures 4. “Look” through the mask to see the resulting “nanoparticles” – sprinkle with a small amount of talcum powder. Carefully remove the spheres and frame. 5. Cover the top surface of contact paper with colored construction paper. 6. Turn over and note pattern 7. Vary the template shape, “nanosphere” size, and other factors to create other “nanoparticle” geometries. Slide 27: Template #1 Slide 28: Pattern Produced from Template #1 Slide 29: Can you make pattern #2 ? Slide 30: Solution for Challenge Pattern #2: Slide 31: Can you make pattern #2 ? Slide 32: Solution for Challenge Pattern #3 Slide 33: Can you make pattern #4? Slide 34: Solution for Challenge Pattern #4 Slide 35: Nanostructures Sun, Y.; Xia, Y. Science 2002, 298, 2176. Courtesy of Liza Babayon Baughman, R. H.; Zakhidov, A. A.; de Heer, W. A. Science 2002, 297, 787 Vigolo, B; Penicuad, A.; Coulon, C.; Sauder, C.; Pailler, R Journey, C.; Bernier, P. Poulin, P. Science 2000, 290, 1331 CdSe Quantum Dots Carbon Nanotubes Noble Metal Nanoparticles Courtesy of the Van Duyne group Slide 36: Carbon Nanotubes: Crossbar array of a set of parallel CNTs on a substrate and a set of perpendicular CNTs suspended on a periodic array of supports. Each cross point corresponds to a device element. Well-defined OFF and ON states. Switching between ON and OFF states can take place by charging the nanotubes to produce attractive or repulsive electrostatic forces. Molecular scale electromechanical devices! C.M. Lieber et. al. Science 2000, 289, 94. Memory Metals : Memory Metals Made of a Ni and Ti alloy Discovery Activity E What’s Happening – see hot and cold models on p.19 of “Exploring the Nanoworld” booklet Memory Metal Uses(Eye Glass Frames and Braces) : Memory Metal Uses(Eye Glass Frames and Braces) Memory Metal Uses(Surgical Stents) : Memory Metal Uses(Surgical Stents) Memory Metal Art : Memory Metal Art Memory Metal Art : Memory Metal Art Bucky Balls(Buckministerfullerenes) : Bucky Balls(Buckministerfullerenes) Possible Uses In Medicine In Electronics In Optics As Hairy Balls Slide 43: Ankush

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