Control
of single-walled carbon nanotube dispersion properties is of substantial
interest to the scientific community. In this work, we sought to investigate
the effect of a macrocycle, pillar[5]arene, on the dispersion properties
of a polymer–nanotube complex. Pillar[5]arenes are a class
of electron-rich macrocyclic hosts capable of forming inclusion complexes
with electron-poor guests, such as alkyl nitriles. A hydroxyl-functionalized
pillar[5]arene derivative was coupled to the alkyl bromide side chains
of a polyfluorene, which was then used to coat the surface of single-walled
carbon nanotubes. Noncovalent functionalization of carbon nanotubes
with the macrocycle-containing conjugated polymer significantly enhanced
nanotube solubility, resulting in dark and concentrated nanotube dispersions
(600 μg mL
–1
), as evidenced by UV–vis–NIR
spectroscopy and thermogravimetric analysis. Differentiation of semiconducting
and metallic single-walled carbon nanotube species was analyzed by
a combination of UV–vis–NIR, Raman, and fluorescence
spectroscopy. Raman spectroscopy confirmed that the concentrated nanotube
dispersion produced by the macrocycle-containing polymer was due to
well-exfoliated nanotubes, rather than bundle formation. The polymer–nanotube
dispersion was investigated using
1
H NMR spectroscopy,
and it was found that host–guest chemistry between pillar[5]arene
and 1,6-dicyanohexane occurred in the presence of the polymer–nanotube
complex. Utilizing the host–guest capability of pillar[5]arene,
the polymer–nanotube complex was incorporated into a supramolecular
organogel.
Keyword: electrodeposition, wet ionic liquid, possible application to mining wastes https://mc06.manuscriptcentral.com/cjc-pubs We investigated the deposition of silver, copper, and lead from the ionic liquid 1-11
ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide [EMIM][TFSI] under 12potentiostatic conditions in the presence of water. This was part of a larger project 13 involving the extraction of metal ions from mining waste into an ionic liquid, followed by 14 electrodeposition so that the ionic liquid could be recycled. All three elements were 15 deposited in metallic form by electrolysis in the ionic liquid, and the process was 16
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