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Theory and Experiment of Binary Diffusion Coefficient of n-Alkanes in Dilute Gases.
- Source :
-
Journal of Physical Chemistry A . Oct2016, Vol. 120 Issue 41, p8065-8074. 10p. - Publication Year :
- 2016
-
Abstract
- Binary diffusion coefficients were measured for n-pentane, n-hexane, and n-octane in helium and of n-pentane in nitrogen over the temperature range of 300 to 600 K, using reversed-flow gas chromatography. A generalized, analytical theory is proposed for the binary diffusion coefficients of long-chain molecules in simple diluent gases, taking advantage of a recently developed gas-kinetic theory of the transport properties of nanoslender bodies in dilute free-molecular flows. The theory addresses the long-standing question about the applicability of the Chapman-Enskog theory in describing the transport properties of nonspherical molecular structures, or equivalently, the use of isotropic potentials of interaction for a roughly cylindrical molecular structure such as large normal alkanes. An approximate potential energy function is proposed for the intermolecular interaction of long-chain n-alkane with typical bath gases. Using this potential and the analytical theory for nanoslender bodies, we show that the diffusion coefficients of n-alkanes in typical bath gases can be treated by the resulting analytical model accurately, especially for compounds larger than n-butane. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10895639
- Volume :
- 120
- Issue :
- 41
- Database :
- Academic Search Index
- Journal :
- Journal of Physical Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 119004019
- Full Text :
- https://doi.org/10.1021/acs.jpca.6b08261