Adsorption Equilibria of Light Organics on Single-Walled Carbon Nanotube Heterogeneous Bundles: Thermodynamical Aspects
| Autor: | Sandeep Agnihotri, José P. B. Mota, Isabel A. A. C. Esteves, Fernando J. A. L. Cruz |
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| Rok vydání: | 2011 |
| Předmět: |
Morphology (linguistics)
Yield (engineering) Vapor pressure Chemistry Thermodynamics Carbon nanotube Supercritical fluid Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention General Energy Adsorption law Gravimetric analysis Physical and Theoretical Chemistry Bar (unit) |
| Zdroj: | The Journal of Physical Chemistry C. 115:2622-2629 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp108120h |
| Popis: | Single-component adsorption equilibria of five different hydrocarbons (CH4, C2H6, C2H4, C3H8, and C3H6) on a high-purity sample of single-walled carbon nanotube heterogeneous bundles were measured using a static gravimetric method. The physicochemical properties and morphology of the bundles were thoroughly characterized to obtain information about the tube diameter distribution; the latter is shown to be well approximated by a Gaussian function with a mean diameter of 14.1 ± 1.4 A. The adsorption measurements were performed at room temperature (T ≈ 300 K) and pressures from 2 × 10−3 up to 80 bar corresponding to reduced temperatures, T/Tc, from 0.81 to 1.59 and relative pressures, p/p0, in the range 1.4 × 10−5 to 0.89, where Tc and p0 are, respectively, the critical temperature and saturation vapor pressure of the adsorptive fluid. The excess adsorption isotherms exhibit an overall type-II shape, except that of supercritical CH4 which is type-I; none of the isotherms yield a hysteresis loop at the studie... |
| Databáze: | OpenAIRE |
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