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The Applications of Nano Materials

The Applications of Nano Materials. Department of Chemical and Materials Engineering San Jose State University. Zhen Guo, Ph. D. Technology and Characterization of Nano Material Science Session VI: Nano Material Synthesis (Bottom Up) Session VII: Nano Technology (Top Down)

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The Applications of Nano Materials

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  1. The Applications of Nano Materials Department of Chemical and Materials Engineering San Jose State University Zhen Guo, Ph. D.

  2. Technology and Characterization • of Nano Material Science • Session VI: Nano Material Synthesis (Bottom Up) • Session VII: Nano Technology (Top Down) • Session VIII: Nano Material Characterization 03/08/06

  3. Session VIII: Characterization of Nano Materials Appendix

  4. Diffraction and Bragg’s Law Constructive Interference Condition: Phase Difference between beam 1 and 2 = 2dSinq = nl

  5. Why Electron Microscopy • Wave length of Visible light, X-ray and Electron Beam (200KV) • Requirement of Nano Material Characterization http://ncem.lbl.gov

  6. Reciprocal Lattice (K-Space) Fourier Transformation Real Lattice: Reciprocal Lattice:

  7. a3 C n 1/l O 1/k a2 B 1/h A a1 Reciprocal verse Real Lattice 2dSinq = nl 2Sinq/l = n/d = k

  8. What is unique about nano materials • Instead of single point in an infinite bulk material case, The lattice point in reciprocal lattice will change to other shape with finite volume for nano materials. • Since it is Reciprocal space, everything is 1/length scale, the lattice point will change according to object physical size / shape • Reciprocal lattice of 2-D thin film will be rod-like perpendicular to the thin film. • Reciprocal lattice of 1-D fibers will be plate-like perpendicular to the fiber. • Reciprocal lattice of Nano particles will be a sphere-like

  9. Intensity X-ray peak widening verse nano materials grain size • Infinite large single crystals will bring single line of diffraction pattern. • In reality, every peak has its width due to multiple grain size • Half width of peak provide information about grain size • Nano materials will have very wide X-ray peak and from there we can back calculate grain size 2q

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