8 - Surfaces SurfacesandInterfaces Objectives Objectives...

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rfaces and Interfaces Surfaces and Interfaces
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bjectives Objectives Outline surface energy concepts. Discuss the correlation between structure and surface energy. 2
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Five types of interfaces Solid Solid lid as Solid Gas Solid Liquid Liquid Liquid quid as Liquid Gas
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Interface Observation Application Surfaces and Interfaces Solid/Gas Adsorption of gas Friction Sublimation Oxidation of nonoxides Gas dehydration Adsorption/Desorption e - -exchange Catalysis Solid/Liquid Adsorption of dissolved ecies Spec. adsorption rg molecules on species Electrode processes (Redox reactions) Dissolution / org. molecules on powder Solid electrolytes Powder preparation Precipitation Wetting electrical charging Liquid phase sintering Conditioning of ceramic powders in H 2 O Solid/Solid Adhesion and Cohesion Joining of materials Sintering Liquid/Gas Evaporation / Powder preparation Condensation Liquid/Liquid De-mixing Glas melts Emulsions
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Liquid Gas Interface Liquid Phase boundary Vapor ρ (z) is the local density; z is distance i t fil t th li id/ h bd Density profile at the liquid/vapor phase boundary Thickness of phase boundary is about 1 micrometer at boiling temperature
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A single substance going supercritical as the temperature is raised and the meniscus disappears (CO 2 ) A liquid in equilibrium with its vapor in a Meniscus becomes indistinct as the temperature is raised and e densities of the two Supercritical fluid: at the critical temperature, the densities and all other roperties are identical high pressure cell the densities of the two phases approach each other properties are identical
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Supercritical Pressure olid Fluid Solid Liquid Gas Temperature
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Liquid/vapor interface Vapor hase boundary Phase boundary line iquid Liquid
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This note was uploaded on 03/04/2010 for the course MSE 4144 taught by Professor Sigmund during the Spring '10 term at University of Florida.

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8 - Surfaces SurfacesandInterfaces Objectives Objectives...

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