Transfer of chirality from molecule to phase in self-assembled chiral block copolymers

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題名:	Transfer of chirality from molecule to phase in self-assembled chiral block copolymers
作者:	王孝方;Ho, Rong-Ming;Li, Ming-Chia;Lin, Shih-Chieh;Wang, Hsiao-Fang;Lee, Yu-Der;Hasegawa, Hirokazu;Thomas, Edwin L.
貢獻者:	工學院化學工程與材料工程學系
關鍵詞:	circular dichroism spectroscopy;composite polymers;fluorescence;micelles;nanomaterials;stereoisomerism;toluene;tomography;transmission electron microscopy
日期:	2012-07-04
上傳時間:	2026-04-21 13:58:00 (UTC+8)
出版者:	American Chemical Society;United States: American Chemical Society
摘要:	摘要： Here, we report the mechanisms of chiral transfer at various length scales in the self-assembly of enantiomeric chiral block copolymers (BCPs). We show the evolution of homochirality from molecular chirality into phase chirality in the self-assembly of the BCPs. The chirality of the molecule in the BCP* is identified from circular dichroism (CD) spectra, while the handedness of the helical conformation in the BCP* is determined from a split-type Cotton effect in vibrational circular dichroism spectra. Microphase separation of the BCP* is exploited to form a helical (H) phase, and the handedness of helical nanostructure in the BCP is directly visualized from transmission electron microscopy tomography. As examined by CD and fluorescence experiments, significant induced CD signals and a bathochromic shift of fluorescence emission for the achiral perylene moiety as a chemical junction of the BCPs* can be found while the concentration of the BCPs* in toluene solution is higher than the critical micelle concentration, suggesting a twisting and shifting mechanism initiating from the microphase-separated interface of the BCPs* leading to formation of the H* phase from self-assembly. 其他題名： J. Am. Chem. Soc 出版者： United States: American Chemical Society 出版日期： 2012-07-04 出處： Journal of the American Chemical Society, 2012-07, Vol.134 (26), p.10974-10986 資源來源： American Chemical Society Journals 版權： Copyright © 2012 American Chemical Society 識別號： ISSN: 0002-7863 識別號： ISSN: 1520-5126 識別號： EISSN: 1520-5126 識別號： DOI: 10.1021/ja303513f 識別號： PMID: 22621336
顯示於類別:	[化學工程與材料工程學系 ] 期刊論文

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