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Review The use of nitrogen adsorption for the ...

Colloids and SurfacesA: Physicochemical and Engineering Aspects 187 188 (2001) 3 9 ReviewThe use of nitrogen adsorption for the characterisation ofporous materialsKenneth Sing *School of Chemistry,Bristol Uni ersity,Bristol,UKAbstractProblems, which may arise when low-temperature nitrogen adsorption is used for the characterisation of porousmaterials, are discussed in this Review . Continuous or discontinuous manometric techniques can be employed fornitrogen adsorption measurements at 77 K. For pore structure analysis, the nitrogen adsorption desorptionisotherms should be determined over the widest possible range of relative pressure, while allowing for slowequilibration and other operational problems, particularly at very low pressures.

characterisation of a wide range of porous materi-als. Of all the many gases and vapours, which are readily available and could be used as adsorptives, nitrogen has remained universally pre-eminent. With the aid of user-friendly commercial equip-ment and on-line data processing, it is now possi-ble to use nitrogen adsorption at 77 K for both

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