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• W2059161444 endingPage "2383" @default.
• W2059161444 startingPage "2374" @default.
• W2059161444 abstract "In the present paper, we ascertain two novel findings on chiral-index-selective binding/separating of single-walled carbon nanotubes (SWNTs) with a nonaromatic polymer, poly(dialkylsilane) (PSi). PSi is a typical σ-conjugated polymer, composed of alkyl side chains attached to the silicon (Si)-catenated main chain. First, PSi’s with linear alkyl side chains showed significant diameter-selective wrapping for SWNTs with ca. 0.9 nm in diameter, resulting in the selective separation of (7,6) and (9,4) SWNTs. Its driving force was demonstrated to be cooperative CH−π interactions among the alkyl side chains of PSi’s and the curved graphene of SWNTs. Second, the dynamic wrapping behavior of PSi’s onto SWNTs was elucidated with time-resolved UV spectroscopy. Highly anisotropic UV absorption of PSi along the Si main chain was utilized as a “chromophoric indicator” to monitor the global/local conformations, which enabled us to track kinetic structural changes of PSi’s on SWNTs. Consequently, we concluded that upon wrapping, flexible/helical PSi with an average dihedral angle (φ) of 145° and Kuhn’s segment length (λ–1) of 2.6 nm interconverted to the more stiffer/planar conformation with 170° and λ–1 of 7.4 nm. Furthermore, through kinetic analyses of the time-course UV spectra, we discovered the fact that PSi’s involve three distinct structural changes during wrapping. That is, (i) the very fast adsorption of several segments within dead time of mixing (<30 ms), following (ii) the gradual adsorption of loosely wrapped segments with the half-maximum values (τ1) of 31.4 ms, and (iii) the slow rearrangement of the entire chains with τ2 of 123.1 ms, coupling with elongation of the segment lengths. The present results may be useful for rational design of polymers toward chiral-index-selective binding/separating of desired (n,m) SWNTs." @default.
• W2059161444 created "2016-06-24" @default.
• W2059161444 creator A5014594040 @default.
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• W2059161444 creator A5053825705 @default.
• W2059161444 creator A5059045015 @default.
• W2059161444 creator A5066704922 @default.
• W2059161444 date "2013-02-04" @default.
• W2059161444 modified "2023-09-23" @default.
• W2059161444 title "Time-Resolved Observation of Chiral-Index-Selective Wrapping on Single-Walled Carbon Nanotube with Non-Aromatic Polysilane" @default.
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• W2059161444 doi "https://doi.org/10.1021/ja311799m" @default.
• W2059161444 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23320539" @default.
• W2059161444 hasPublicationYear "2013" @default.
• W2059161444 type Work @default.

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