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Investigation of the pore structure of single-walled carbon nanotubes by N2/Ar adsorption

Benoit Simard*, Zygmunt Jakubek, Wei-Fang Du, and John Ripmeester

Steacie Institute for Molecular Sciences, National Research Council of Canada,
Ottawa, ON K4A 3H9 CANADA

This is an abstract for a presentation given at the
10th Foresight Conference on Molecular Nanotechnology

 

Open single-walled carbon nanotubes (SWNTs) are attractive as potential storage media for gases, liquids, solids and biological molecules. In the area of gas storage, there exits many controversies as to the real storage capacity of SWNT. In order to shed light into these controversies and understand how the storage capacity is affected by chemical modifications, we investigated the micropore structure of various SWNTs samples by nitrogen and argon adsorption technique at low pressures. Much effort was placed in the establishment of protocol for obtaining meaningful isotherms. The conditions to obtain reliable isotherms will be presented discussed and illustrated with various examples. The proportion of open SWNT is estimated from these isotherms with the methods. We will show how the pore size distribution is dependent on the model used. We will demonstrate through series of measurements with various characterizations methods the way to derive meaningful pore size distributions. In addition, we will show how chemical modifications with various methods and reagents affect the pore volumes. The results provide new insights into the controversies surrounding gas storage in SWNT. In light of these results, a proper, reproducible and reliable protocol for the preparation of SWNT for gas uptake should be described.

Abstract in Microsoft Word® format 20,806 bytes


*Corresponding Address:
Benoit Simard
Steacie Institute for Molecular Sciences, National Research Council of Canada
100 Sussex Drive, Ottawa, ON K4A 3H9 CANADA
Phone: 613-990-0977 Fax: 613-991-2648
Email: Benoit.Simard@nrc.ca



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