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Wang X, Liu K, Arsenault AC, et al. Shell-cross-linked cylindrical Polyisoprene-b-polyferrocenylsilane (PI-b-PFS) block copolymer micelles: one-dimensional (1D) organometallic nanocylinders. J Am Chem Soc. 2007;129(17):5630-9doi: 10.1021/ja068730f.
Wang, X., Liu, K., Arsenault, A. C., Rider, D. A., Ozin, G. A., Winnik, M. A., & Manners, I. (2007). Shell-cross-linked cylindrical Polyisoprene-b-polyferrocenylsilane (PI-b-PFS) block copolymer micelles: one-dimensional (1D) organometallic nanocylinders. Journal of the American Chemical Society, 129(17), 5630-9. https://doi.org/10.1021/ja068730f
Wang, Xiaosong, et al. "Shell-cross-linked cylindrical Polyisoprene-b-polyferrocenylsilane (PI-b-PFS) block copolymer micelles: one-dimensional (1D) organometallic nanocylinders." Journal of the American Chemical Society vol. 129,17 (2007): 5630-9. doi: https://doi.org/10.1021/ja068730f
Wang X, Liu K, Arsenault AC, Rider DA, Ozin GA, Winnik MA, Manners I. Shell-cross-linked cylindrical Polyisoprene-b-polyferrocenylsilane (PI-b-PFS) block copolymer micelles: one-dimensional (1D) organometallic nanocylinders. J Am Chem Soc. 2007 May 02;129(17):5630-9. doi: 10.1021/ja068730f. Epub 2007 Apr 06. PMID: 17411042.
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J Am Chem Soc. 2007 May 02;129(17):5630-9. doi: 10.1021/ja068730f. Epub 2007 Apr 06.

Shell-cross-linked cylindrical Polyisoprene-b-polyferrocenylsilane (PI-b-PFS) block copolymer micelles: one-dimensional (1D) organometallic nanocylinders.

Journal of the American Chemical Society

Xiaosong Wang, Kun Liu, André C Arsenault, David A Rider, Geoffrey A Ozin, Mitchell A Winnik, Ian Manners

Affiliations

  1. Department of Chemistry, University of Toronto, 80 Saint George Street, Toronto, Ontario, Canada.

PMID: 17411042 DOI: 10.1021/ja068730f

Abstract

We report the creation and properties of colloidally stable shell-cross-linked cylindrical organometallic block copolymer micelles with adjustable length and swellability. The one-dimensional (1D) structures with semicrystalline polyferrocenylsilane (PFS) cores and polyisoprene (PI) coronas were initially self-assembled from PI-b-PFS block copolymers in a PI-selective solvent such as hexane. The length of the cylinders could be varied from hundreds of nanometers to several tens of micrometers by adjusting solution conditions, using various solvents such as hexane, decane, or hexane/THF (or toluene) mixtures. The cylindrical micelles with vinyl groups in the PI corona were cross-linked through a Pt(0)-catalyzed hydrosilylation reaction using 1,1,3,3-tetramethyl disiloxane as a cross-linker at room temperature. The shell cross-linking significantly increased the stability of the micelles relative to the un-cross-linked precursors as no fragmentation was observed upon sonication in solution. In addition, the structural integrity of the micelles was also enhanced after solvent removal; a solid sample was successfully microtomed and then examined using TEM, which revealed circular cross-sections for the PI-b-PFS micelles with an average diameter of ca. 15 nm. We also discovered that shell cross-linking is a prerequisite for generating ceramic replicas through the pyrolysis of PI-b-PFS aggregates. Moreover, we were able to pattern the cross-linked micelles on a flat substrate by microfluidic techniques, generating perpendicularly crossed lines of aligned micelles. In short, the shell-cross-linked PI-b-PFS 1D organometallic aggregates are a promising new type of nanomaterial with intriguing potential applications.

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