Flavin-derived Self-organization and Chirality Separation of Single-walled Carbon Nanotubes

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ProQuest, 2008 - 150 pages
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Chapter 4 revisits the surfactant amine-assisted semiconducting ( sem-) SWNTs separation in THF media. For this, we synthesized an asymmetric diacetylenic surfactant amine(57ECA), in which adequate chemical anisotropy was generated along its tail to probe the molecular dynamics in the presence and absence of nanotubes via NMR. This surfactant can simulate the similar sem-SWNTs separation, like ODA. This study suggests that the surfactant amine head is firmly immobilized onto the nanotube surface together with acidic water, while the aliphatic tail progressively gains larger mobility as it gets farther from the SWNT. The spectroscopic results indicate that the sem-enriched sample is populated mainly from small nanotube bundles containing three SWNTs. Molecular simulations in conjunction with previously determined HNO3/H2SO4 oxidation depths for met- and sem-SWNTs indicate that the strong pinning of the amine surfactants on the sem-enriched SWNTs bundles is a result of a well-ordered arrangement of amine salts separated with a monomolecular layer of H2O molecules. Such continuous 2D arrangement of hydrated amine salts can be attained from a specific type and diameter nanotubes, which provides the necessary surfactant stability for effective THF dispersion and subsequent enrichment.
  

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Contents

INTRODUCTION
1
SYNTHESIS AND REDOX BEHAVIOR OF FLAVIN
26
CHIRALITY SELECTION THROUGH HELICAL SELF
72
ENRICHMENT MECHANISM OF SEMICONDUCTING
100
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