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CHEN 1000 Nanotech lecture 2 Notes

CHEN 1000 Nanotech lecture 2 Notes - NOTD Buckyballs and...

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1 NOTD Biomimetics Thanks to Nat Wilkes Buckyballs and Nanotubes Clicker Question A carbon atom has a diameter of about 0.2 nm. Imagine that there is a cubic nanoparticle with dimensions 20 nm x 20 nm x 20 nm. Approximately how many carbon atoms are in the nanoparticle? A: 100 B: 10,000 C: 1,000,000 20 nm (20 nm)/(0.2 nm) = 100 molecules across an edge 100 x 100 x 100 = 1,000,000 The Smallest Particles - Atomic Clusters Blast a material with a laser, and small pieces called atomic clusters detach. Scientists study the sizes of these clusters by feeding them into an instrument called a mass spectrometer which gives a “histogram” of the cluster size. Certain sizes are most common. In this case, clusters with 13, 19, 25, 55 atoms, etc. are the most prevalent. Why? “Magic Numbers” Certain clusters correspond to nice close-packed structures which can be formed by packing spheres. These are generally the most stable clusters and since they are common, they correspond to peaks in the mass spectrum. 7 13 19 Carbon Clusters In 1985, Richard Smalley at Rice Univ. was looking at carbon clusters. He was making soot . 60, 70, and 118 are not the usual magic numbers. What are these clusters?
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2 C60, the Soccer Ball Molecule Smalley hypothesized that the C60 cluster was actually a hollow molecule made entirely of carbon atoms joined in hexagons and pentagons.
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