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Chemistry · L5 · Langmuir Monolayer vs BET Multilayer Adsorption

Contrasts Langmuir's strict monolayer, hard-saturating-at-θ=1 picture with the BET extension, where additional layers keep stacking as pressure approaches the gas's saturation vapour pressure.

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Gas-phase molecules approach a solid surfaceWhich adsorption model applies?Single layer of adsorbed moleculesEach site holds at most 1 moleculeMultiple stacked layersEach layer adsorbs onto the one belowtheta saturates at 1No further uptake possibleUptake keeps risingas P approaches saturation vapour pressureLangmuir: monolayer onlyBET: multilayer

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