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Interesting and Promising Nanomaterials and Nanoscale Structures

Interesting and Promising Nanomaterials and Nanoscale Structures. Part II. Yonhua Tzeng, Professor Electrical and Computer Engineering Auburn University, Alabama USA. July 7, 2003. Phage display to align the nanoparticles. ZnS nucleation and binding. Zn 2+. + S 2-. ZnS.

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Interesting and Promising Nanomaterials and Nanoscale Structures

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  1. Interesting and Promising Nanomaterials and Nanoscale Structures Part II Yonhua Tzeng, Professor Electrical and Computer Engineering Auburn University, Alabama USA July 7, 2003

  2. Phage display to align the nanoparticles ZnS nucleation and binding Zn2+ + S2- ZnS 3 MAY 2002 VOL 296 SCIENCE www.sciencemag.org P892-895

  3. Quantum confinement • Trap particles and restrict their motion • Quantum confinement produces new material behavior/phenomena • “Engineer confinement”- control for specific applications • Structures • Quantum dots (0-D) only confined states, and no freely moving ones • Nanowires (1-D) particles travel only along the wire • Quantum wells (2-D) confines particles within a thin layer http://www.me.berkeley.edu/nti/englander1.ppt http://phys.educ.ksu.edu/vqm/index.html (Scientific American)

  4. 2-D Electron Gas http://gard04.mc2.chalmers.se/MRTI/PDF%5CLecture7.pdf

  5. Photonic Crystal - Tunable Please stretch yourself when we are doing research!

  6. Three-dimensional Structures: MIT Photonic Crystal Group have proposed (in 1994 and 2000) structures with full three-dimensional band gaps which, we hope, will be amenable to fabrication. The layers themselves are an alternating stack of the two characteristic types of 2d (or slab) photonic crystals: dielectric rods in air and air holes in dielectric. The fundamental structure is actually very simple: an fcc lattice (possibly distorted) of air (or low-index) cylinders in dielectric, oriented along the 111 direction. This results in the layered structure rendered above, and depicted schematically below (in vertical and horizontal cross-sections): Typical parameters, for an undistorted fcc lattice of air cylinders in a dielectric constant of 12 (Si), are: d=a/sqrt(3), x=a/sqrt(2), r=0.293a, and h=0.93a, where a is the fcc lattice constant. This results in a 21% complete three-dimensional band gap, centered at a frequency of 0.569 c/a. http://ab-initio.mit.edu/photons/3d-crystal.html#1994

  7. Photonic Crystal - Opal

  8. http://www.cs.unc.edu/Research/nano/documentarchive/talks/2002Taiwan_taylor_SEM_AFM.pdfhttp://www.cs.unc.edu/Research/nano/documentarchive/talks/2002Taiwan_taylor_SEM_AFM.pdf

  9. Nanocomposite Nanoparticles In polymer matrix Characterizing Nanostructure Particle size and shape Surface & intermediate layer Properties Electronic Optical Mechanical Thermal …

  10. Electrostrictive Polymers Crystalline Polymer (After Prof. Z.Y. Cheng, Auburn University)

  11. Demonstration – High Strain Strain ~ 5% Compare to 0.1~0.2% Image from Prof. Cheng, Auburn University

  12. DNA http://www-hpc.jpl.nasa.gov/PEP/gekco/nemo3D/molecules.html

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