Article | REF: P1051 V1

Texture of divided materials Pore size of nanoporous materials from nitrogen adsorption

Authors: Françoise ROUQUEROL, Jean ROUQUEROL, Isabelle BEURROIES, Philip LLEWELLYN, Renaud DENOYEL

Publication date: June 10, 2017, Review date: October 23, 2020

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1. Theories of adsorption by porous materials

There are many theories of adsorption, but only those considered most directly useful for determining the pore size distribution of nanoporous materials are given here .

1.1 Kelvin's law of capillary condensation

In a capillary tube, a gas condenses at a vapour pressure p lower than its saturation vapour pressure p 0 provided the liquid wets the capillary walls, i.e. provided the contact angle θ formed between liquid and solid...

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Theories of adsorption by porous materials