MSE 360

Structure at the Nanoscale

Term Offered: Fall
Text(s):  
Instructor(s):

Professor David Luzzi, Room 326 LRSM, luzzi@lrsm.upenn.edu, 898-8366
Prerequisite(s): MSE 220
Grading:  
Course Home Page URL:  
Course Description: Basic principles of material structure and organization from nano to macro sizes. This course will cover the fundamentals of materials structure including the crystalline, liquid crystalline and glassy states as well as 1-D, 2-D and 3-D structure and defects. Examples will be used from the different classes of materials - metallic, semiconductor, inorganic, polymeric - with particular emphasis on important components of structure on the nanoscale including particles, surfaces, interfaces and defects.

Course Outline: Introduction to structure
Examples of 0-D, 1-D, 2-D and 3-D structures and associated properties and performance
Bonds, structural descriptors
Atom- and ion-based Crystal Structures - metallic and close-packed structures, functionality and covalent structures, ion groups and Pauling's rules, examples
Molecular geometry, large molecules and macromolecules - dendrimers, protein structure
Particulates and colloids - particle size, surface area, surface charge, quantum dots
1-D and quasi-1-D - tubes, wires

Non-crystalline states-order parameters, SRO, Tg, free volome, PDF, Bernal, Voronoi, grains and polycrystals
Network model of glasses-Polymers, oxide glasses, chalcogenide glasses, examples
Fractal models-DLA, DLCAss

Description of the crystalline state - symmetry
Crystalline states-2D, translational symmetry, rotation axes, reflection, reflection + rotation
Plane point groups-International symbols, rotation + translation, reflection + translation
Glide, plane groups
3D, inversion, roto-inversion, roto-reflection, screw axes
Examples, Miller indices, stereographic projection
Combination of rotation axes, unique improper rotation axes
Crystallographic point groups-examples w/web movies, space lattices
Space groups, glide planes, screw axes
Symmetry and properties, tensors, examples

Symmetry of liquid crystals I
Symmetry of liquid crystals II, examples of diffraction patterns of liquid crystals, birefringence, LCD

Defects and microstructure-Point defects, metals, molecular crystals, ionic crystals, Kroger-Vink, Schottky defects, Frenkel defects
Line defects-dislocations, disclinations, Burgers, Frank-Nabarro circuits, dislocation reactions
Surfaces-surface tension and free energy, Wulff plot, bonding, reconstruction
Planar defects-interfaces, stacking faults, antiphase boundaries, coherence, grain boundaries, domain walls, particulate formation at interfaces
 


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