Abstract
IN the determination of surface area using nitrogen at the temperature of liquid nitrogen by the method of Brunauer, Emmett and Teller1, it is usual to determine the dead-space on each sample, using helium. For routine determinations on a substance known to give S-shaped isotherms, that is, where the equation of Brunauer, Emmett and Teller is applicable, it is possible to avoid this dead-space determination. If V1 c.c. nitrogen are adsorbed at a pressure p1, then the dead-space is given by where D is dead-space at unit pressure and a is a correction factor equal to 6.58 × 10- 5 at unit pressure. Hence, if Vc1 is volume of nitrogen in the sample bulb, then It follows that
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References
Brunauer, Emmett and Teller, J. Amer. Chem. Soc., 60, 309 (1938).
Emmett, P. H., "Symposium on New Methods of Determining Particle Size in Subsieve Range", Amer. Soc. Test. Mat., p. 95 (March 1941).
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BUGGE, P., KERLOGUE, R. & WESTWICK, F. Surface Area Determination. Nature 158, 28 (1946). https://doi.org/10.1038/158028b0
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DOI: https://doi.org/10.1038/158028b0
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