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The effects of the electronic structure of micropores on the small angle scattering of X-rays and neutrons

Hall, Peter J., Brown, Steven, Fernandez, John and Calo, J. M. (2000) The effects of the electronic structure of micropores on the small angle scattering of X-rays and neutrons. Carbon, 38 (8). pp. 1257-1259. ISSN 0008-6223

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Gas adsorption techniques represent what are perhaps the most common approach to the characterisation of the pore structure of porous materials. Within this general area, the most popular technique by far is to derive surface area and pore size distribution information from nitrogen adsorption isotherms obtained at 77 K. Surface areas are most typically obtained from BET analyses (multipoint or single point), and pore size distributions from a number of different techniques. Mesopore size distributions are usually obtained from techniques based on various adaptations of the Kelvin equation, such as the BJH [1] and DM [2] approaches. A number of different approaches have been proposed for micropore analysis, although it appears that no single technique is applicable to all situations. These range from micropore volume determinations using the so-called t-plot and α-plot methods, involving comparisons of experimental isotherms to standard isotherms, to pore size distribution determinations based on micropore-filling arguments, such as those related to the Dubinin–Radushkevitch equation, and others, like the Horvath–Kawazoe [3] and density functional theory [4] methods. Often, pore size distribution determinations based on micropore filling arguments use CO2 adsorption at 273 K, to circumvent activated diffusion problems which may be encountered by nitrogen at 77 K in the smallest micropores (i.e., the ultramicropores

Item Type: Article
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Schools: School of Applied Sciences
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Depositing User: Sara Taylor
Date Deposited: 16 Oct 2008 10:35
Last Modified: 25 Feb 2010 10:16

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