RelativeResourceManager(22) - Nanoscience nanotechnology...

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Nanoscience, nanotechnology, and analytical characterization Chem 420 December 01, 2008 Professor Ryan C. Bailey
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Problem set #5 z Posted on Compass z Due in class on Monday, December 8 z Assignments are due at beginning of class—starts at 12 Noon! z For full credit assignments must be in box when the lecture begins. z Any assignment turned in between noon and 12:05 PM will automatically be deducted 5 points. z Assignments will NOT be accepted for credit after 12:05 PM. z Score = 0
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Final Exam Information z Wednesday, December 17, 1:30-4:30 PM z Exam locations: 160 English Building and 217 Noyes Lab z We will decide who goes where in class today!!!
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Nanoscience/Nanotechnology: What is it? z The study and utilization of materials and structures that have at least one dimension on the nanometer length scale z (1-999 nm) z Nanometer is 10 -9 meters z One billion nanometers per meter z Wavelength of visible light is 400-800 nm
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Popular nanoscience and nanotechnology
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Why are these materials interesting? z At the nanometer scale, properties become size- dependent z Thermal properties: melting temperature, heat capacity z Mechanical properties: adhesion, strength per weight z Optical properties: absorption and scattering of light z Electrical properties: current transport z Magnetic properties: superparamagnetic effect
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Thermal properties z Example: Bulk CdSe melts at 1678 K, while a 3 nm CdSe particle melts at 700 K Diameter decreases Surface-to-Volume Increases Surface Energy Increases Melting Point decreases
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This note was uploaded on 04/08/2010 for the course CHEM 420 taught by Professor Bailey during the Spring '08 term at University of Illinois at Urbana–Champaign.

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RelativeResourceManager(22) - Nanoscience nanotechnology...

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