ICCAS OpenIR
Self-assembling of helical poly(phenylacetylene) carrying L-valine pendants in solution, on mica substrate, and on water surface
Li, BS; Kang, SZ; Cheuk, KKL; Wan, LJ; Ling, LS; Bai, CL; Tang, BZ
2004-08-31
Source PublicationLANGMUIR
ISSN0743-7463
Volume20Issue:18Pages:7598-7603
AbstractIn the present work, we investigated self-assembling of a poly(phenylacetylene) carrying L-valine pendants (PPA-Val) in a water/methanol solution, upon evaporation of the solution on mica, and on the water surface. With intercalation of a fluorescence probe of Ru(phen)(2)(dppx)(2+) (phen = 1,10-phenanthroline, dppx = 7,8-dimethyldipyridophenazine) into the hydrophobic cavities associated by the PPA-Val chains, their helical structures were directly detected in solution with an in situ fluorescence microscope. Helical aggregates were observed with AFM upon evaporation of the solvents, suggesting that the helical structures in the solution are the building blocks of the helical aggregates. Self-assembling structures of PPA-Val on the water surface were, however, very different from that formed upon evaporation of its THF solution on the mica surface. The polymer chains associated into a monolayer of extended fibers on the water surface, whereas superhelical fibers formed on the mica surface. Water molecules play a critical role in inducing the polymer to form diverse morphological structures in its bulk solution and on its surface. In solution, the isotropic hydrophobic effect drove the polymer chains to form superhelical aggregates, while on the water surface, the hydrophobic effect concentrated mainly on the lateral part of the polymer, thus giving a monolayer of extended fibers.
DOI10.1021/la0361181
Indexed BySCI
Language英语
WOS IDWOS:000223567900037
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:41[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/81850
Collection中国科学院化学研究所
Corresponding AuthorBai, CL
Affiliation1.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Beijing 100864, Peoples R China
2.Hong Kong Univ Sci & Technol, Dept Chem, Hong Kong, Hong Kong, Peoples R China
Recommended Citation
GB/T 7714
Li, BS,Kang, SZ,Cheuk, KKL,et al. Self-assembling of helical poly(phenylacetylene) carrying L-valine pendants in solution, on mica substrate, and on water surface[J]. LANGMUIR,2004,20(18):7598-7603.
APA Li, BS.,Kang, SZ.,Cheuk, KKL.,Wan, LJ.,Ling, LS.,...&Tang, BZ.(2004).Self-assembling of helical poly(phenylacetylene) carrying L-valine pendants in solution, on mica substrate, and on water surface.LANGMUIR,20(18),7598-7603.
MLA Li, BS,et al."Self-assembling of helical poly(phenylacetylene) carrying L-valine pendants in solution, on mica substrate, and on water surface".LANGMUIR 20.18(2004):7598-7603.
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