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Title:
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Identification by laser desorption ionization mass spectroscopy of large fullerenes formed during the growth of single-walled carbon nanotubes in the HiPco process |
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Author:
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Brinson, Bruce E. |
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Advisor:
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Johnson, Marie Pontier |
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Degree:
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Master of Science thesis |
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Abstract:
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Iron catalyzed gas-phased disproportionation of carbon monoxide under high pressure is known to produce carbon Single Walled Nano-Tubes (SWNT). Non-tubular carbon by products and iron encapsulated-graphitic shelled nano-particles are produced concomitantly under conditions optimized for SWNT production, are undesirable bi-products.
Differences in oxidation thresholds of the constituents and acid leaching of iron particles have been exploited in the co-development of Laser Desorption Ionization Mass Spectroscopy (LDI) evaluation and SWNT purification.
LDI threshold conditions have been established for the analysis of non-SWNT carbon species. It has been shown that neither photochemical decomposition nor photo assisted molecular self-assembly contribute to the mass spectra.
Raw, processed materials and molecular specific extractions are evaluated. Laser Desorption Ionization mass spectroscopy, Transmission Electron Microscopy, Raman and TGA results are reported. |
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Citation:
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Brinson, Bruce E.. "Identification by laser desorption ionization mass spectroscopy of large fullerenes formed during the growth of single-walled carbon nanotubes in the HiPco process." Masters Thesis, Rice University, ETD http://hdl.handle.net/1911/17658. |
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Citable link to this page:
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http://hdl.handle.net/1911/17658 |
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Date:
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2004 |
