Abstract Submitted to the NANOTUBE'05 Conference:

Single-wall carbon nanohorns (SWNHs), a type of thick nanotube assembling to form spherical aggregates, can store drugs and fuels and release them. In order to understand the adsorption sites inside the hollow spaces of SWNHs so that to control the material release, we studied desorption phenomena of organic materials with conventional thermogravimetric measurements but combining with step-wise removal of defects by combustion. We identified the adsorption sites with three types using xylene [1] and benzene [2]. The deepest sites were on the inside surface of the walls at tips and convex parts, the second deepest sites were on other wall surface regions, and the shallowest sites were in the central region of the hollow space inside the SWNHs. Comparing the desorption of benzene and m-xylene, we found that they were bound to the SWNH walls at the first and second deepest sites, but they condensed through self-interaction at the shallowest site.

References:

[1] M. Yudasaka et al., J. Phys. Chem. B, in press.

[2] J. Fan et al., Chem. Phys Lett., 397 (2004) 5.

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