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Surface Area and Porosity - Iowa State University

Surface area and PorosityOutline Background Techniques Surface area Total - physical adsorption External Porosity meso micro12 Tuesday, December 4, 12 Length1 mm1 m1 nm1 macromesomicrometalcrystallite10-3m10-4m 10-5m10-6m10-7m10-8m10-9m10-10mhumanhair red bloodcellred antC-CbondCarbonnanotubeTransistorgatece ll membrane1010010100 TechniquesMercury intrusion AdsorptionPhysicalChemicalTemperature Programmed Methods34 Tuesday, December 4, 12 Physical AdsorptionCharacterization via AdsorptionMaterial Characterization Physical properties DifferentiateGas Adsorption Quantity adsorbed on a Surface as a function of pressure, volume , and temperature Modeled properties Surface area Pore structure Non-destructuve56 Tuesday, December 4, 12 Static AdsorptionXXPVGXA dsorptionQuantity adsorbed - always normalized for mass - cm3/g or moles/gRelative pressure - equilibrium pressure divided by saturation pressure - p/po Equilibrium pressure - vapor pressure above the sample - corrected for temperature (thermal transpiration) Saturation pressure - vapor pressure above a liquidSurface energy - solid/fluid interaction, str

Physical Adsorption Characterization via Adsorption Material Characterization • Physical properties • Differentiate Gas Adsorption • Quantity adsorbed on a surface as a function of pressure, volume, and temperature • Modeled properties • Surface area • Pore structure • Non-destructuve 5 6 Tuesday, December 4, 12

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