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- W2011199310 abstract "Recently, it has become possible to separate and/or enrich fractions of single-wall carbon nanotubes (SWNTs) according to type (or otherwise termed metallicity) and diameter (d(t)). Exposure of acid-treated SWNTs to amines has shown such separation. In this contribution, we describe the underlying mechanism for this separation and provide a better description of the physicochemical properties of charge-stabilized SWNT dispersions in polar aprotic media, such as N,N-dimethylformide (DMF). With the establishment of the reversible nature of the redox chemistry, SWNT(n+) + (n/2)H2O <==> SWNT + nH(+) + (n/4)O2, amine-induced pH changes as well as variations in H2O and O2 concentration in DMF are shown to cause differential partial-reduction trends according to d(t) and metallicity. At a pH of 10, the (n,m)-SWNTs that resist complete reduction to their undoped state remain in suspension while the rest that lose their charges populate the precipitate. These d(t)- and metallicity-dependent redox and separation trends are modeled based on the Gibbs free energy and charge loss as it pertains to the (n,m)-dependent SWNT integrated density of states (I(DOS)) across the corresponding pH-induced redox jump. At a given redox potential, the relative placement of the van Hove singularities and continuum determines the amount of charge left on various (n,m)-SWNTs that governs their relative dispersion stability in DMF." @default.
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- W2011199310 date "2005-11-23" @default.
- W2011199310 modified "2023-09-26" @default.
- W2011199310 title "Diameter and Metallicity Dependent Redox Influences on the Separation of Single-Wall Carbon Nanotubes" @default.
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- W2011199310 doi "https://doi.org/10.1021/nl051840k" @default.
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