Study of a butane monolayer adsorbed on single-walled carbon nanotubes

Langmuir : the ACS Journal of Surfaces and Colloids
D S RawatA D Migone

Abstract

We present the results of a study of first-layer butane films adsorbed on single-walled carbon nanotubes. We measured 12 isotherms between 180 and 311 K. Butane molecules bind more strongly than shorter alkanes to the nanotubes. We measured a value of 391 meV for the low-coverage isosteric heat of butane. This value is 1.21 times larger than that for butane adsorbed on planar graphite and 1.27 times larger than the value for ethane on nanotubes at comparable coverages. We also compared the characteristics of the adsorption isotherms for butane with those we determined for ethane at the same relative temperatures. This comparison allowed us to infer that there is a change in the adsorption behavior of linear alkanes which occurs as a function of increasing carbon chain length. While ethane isotherms display two substeps in the first layer (corresponding to adsorption on different groups of adsorption sites), one of these steps is significantly smeared for butane isotherms, becoming essentially impossible to resolve above 220 K.

References

Nov 15, 1994·Physical Review. B, Condensed Matter·K W HerwigH Taub
Jan 7, 2003·Physical Review Letters·Zugang Mao, Susan B Sinnott
Dec 28, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Dinesh S RawatAldo D Migone
Jul 26, 2006·The Journal of Physical Chemistry. B·Christopher Matranga, Bradley Bockrath

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Citations

Jun 19, 2010·Journal of Molecular Modeling·Zabiollah Bolboli NojiniSepideh Samiee
Jul 7, 2012·The Journal of Physical Chemistry. B·James J CannonJunichiro Shiomi
Jan 7, 2010·Angewandte Chemie·Brendan F AbrahamsRichard Robson
May 17, 2011·Physical Review Letters·Matthias WolffUlrich G Volkmann
May 16, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·D S RawatF J Romá

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