Neat macroscopic membranes of aligned carbon nanotubes
Casavant, Michael John
Smalley, Richard E.
Doctor of Philosophy
This work reports the successful production of neat macroscopic membranes of aligned single-walled carbon nanotubes (SWNTs) via filtration in intense magnetic fields of 25 Tesla and 7 Tesla. These membranes comprise a novel material that allows an unprecedented capability to characterize and manipulate aligned SWNTs, providing access to the more remarkable properties of SWNTs. Surface areas in excess of 100 cm 2 and thickness in excess of seven microns were produced. A density within a factor of two of close packing was achieved. These assemblies exhibit anisotropy in Raman resonance, electrical transport, thermal transport, and reflection of polarized light. These samples provide a macroscopic window to exploring the properties of SWNTs and pave the way for many potential applications. The successful extension of this process to 7 Tesla provides a more pragmatic path towards aligned assemblies of carbon nanotubes. Variations in the properties of the materials made under different magnetic field intensities were observed.* *This dissertation includes a CD that is compound (contains both a paper copy and a CD as part of the dissertation). The CD requires the following application: Notepad.
Condensed matter physics