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Adsorption

, Volume 21, Issue 3, pp 217–227 | Cite as

Dose-dependent isotherm of Kr adsorption on heterogeneous bundles of closed single-walled carbon nanotubes

  • Svetlana Yu Tsareva
  • Edward McRae
  • Fabrice Valsaque
  • Xavier Devaux
Article

Abstract

We present 77 K isotherms of krypton adsorption on bundles of closed highly-pure HiPco single-walled carbon nanotubes (SWCNTs). Two volumetric adsorption protocols were used, one with an increasing Kr dose per injection (IAD), one with a constant dose (CAD). Detailed microstructural examination showed that the SWCNTs combine into small bundles (of 25–30 SWCNTs) which are heterogeneous in diameter with a consequential range of interstitial channel (IC) shapes and sizes. The IC-sites are the subnanoscaled pores with alternating enlargements and constrictions along the tube axes. This results in adsorption dosing (AD) dependent characteristics of the low-pressure region of the isotherm. In the IAD protocol the switch-back behavior of the isotherm stemmed from metastable adsorption. Using the CAD protocol, different branches are observed. Well-pronounced substeps were established which we interpret as corresponding to the formation of various phases of confined Kr with different atoms arrangement. The height of a given substep obtained in different measurements depends on the AD value which can strongly influence the population of the site. Some substeps existing only for certain values of AD suggests the existence of a certain selectivity or of a preferential phase formation according to this value.

Keywords

Single-walled carbon nanotubes bundles Kr adsorption isotherms High-resolution transmission electron microscopy DRIFT spectroscopy 

Notes

Acknowledgments

Acknowledgment is made to the French Agence Nationale de la Recherche (ANR) (Grant ANR-10-BLANC-0819-01-SPRINT) and the Région Lorraine (Grant 30031172) for their support. The authors thank Prof. C. Carteret, Dr. M. Dossot and Dr. S. Fontana for fruitful discussions and Dr. J.-F. Marêché for important technical assistance.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Svetlana Yu Tsareva
    • 1
  • Edward McRae
    • 1
  • Fabrice Valsaque
    • 1
  • Xavier Devaux
    • 1
  1. 1.Institut Jean Lamour, UMR 7198 CNRS - Faculté des Sciences et TechnologiesUniversité de LorraineVandœuvre-lès-NancyFrance

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