Ch 9 Notes - Chapter 9 General Properties of Crystalline...

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Unformatted text preview: Chapter 9- General Properties of Crystalline Solid Surfaces “Major differences exist between fluids and solids, and they must modify the effects described previously for fluids.” Chapter 9: General Properties of Crystalline Solid Surfaces Chapter 9: General Properties of Crystalline Solid Surfaces KEY CONCEPTS KEY CONCEPTS (Note the application of key concepts from previous chapters (Note the application of key concepts from previous chapters in the present discussion) in the present discussion) • What are distinctive features of solid surfaces What are distinctive features of solid surfaces (crystalline, amorphous; (crystalline, amorphous; crystal structures; interphase/epitaxial/grain boundaries; coor crystal structures; interphase/epitaxial/grain boundaries; coor dination dination number) number) ? ? • What are characteristics of the free solid surface What are characteristics of the free solid surface (surface energy, surface (surface energy, surface stress and strain) stress and strain) ? What are key structural parameters that influence ? What are key structural parameters that influence surface energy surface energy (crystal structure, bond character, orientation of surface (crystal structure, bond character, orientation of surface plane, Wulff Plot)? plane, Wulff Plot)? How to estimate surface How to estimate surface energy energy (work of cohesion, (work of cohesion, dangling bonds, energy for sublimation)? dangling bonds, energy for sublimation)? • What structural rearrangements occur to minimize surface free e What structural rearrangements occur to minimize surface free e nergy nergy (surface relaxation & reconstruction, surface roughening (surface relaxation & reconstruction, surface roughening – terrace, steps, terrace, steps, kinks) kinks) ? • What changes in chemical composition reduce surface energy What changes in chemical composition reduce surface energy (adsorption (adsorption – monolayer, Langmuir adsorption isotherm, multilayer monolayer, Langmuir adsorption isotherm, multilayer – BET equation; physisorption, chemisorption; segregation BET equation; physisorption, chemisorption; segregation ? ? •Solids that exhibit repetitive atomic positions are referred to as crystalline •Solids that lack repetitive atomic positions are referred to as noncrystalline or amorphous •A crystalline solid that exhibits only one...
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This note was uploaded on 11/16/2011 for the course EMA 4121 taught by Professor Moudgil during the Spring '11 term at University of Florida.

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Ch 9 Notes - Chapter 9 General Properties of Crystalline...

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