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首页> 外文期刊>Chemistry: A European journal >Pyrene-Based Fluorescent Ambidextrous Gelators: Scaffolds for Mechanically Robust SWNT–Gel Nanocomposites
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Pyrene-Based Fluorescent Ambidextrous Gelators: Scaffolds for Mechanically Robust SWNT–Gel Nanocomposites

机译：yr基荧光双峰凝胶剂：用于机械坚固的SWNT-Gel纳米复合材料的支架

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摘要

With the rapid progress in the development of supramolecular soft materials, examples of low-molecularweight gelators (LMWGs) with the ability to immobilise both water and organic solvents by the same structural scaffold are very limited. In this paper, we report the development of pyrene-containing peptide-based ambidextrous gelators (AGs) with the ability to efficiently gelate both organic and aqueous solvents. The organo- and hydrogelation efficiencies of these gelators are in the range 0.7–1.1% w/v in various organic solvents and 0.5–5% w/v in water at certain acidic pH values (pH 2.0–4.0). Moreover, for the first time, AGs have been utilised to prepare single-walled carbonnanotube (SWNT)-included soft nanocomposites in both hydro- and organogel matrices. The influence of different non-covalent interactions such as hydrogen bonding, hydrophobic, p–p and van der Waals interactions in self-assembled gelation has been studied in detail by circular dichroism, FTIR, variable-temperature NMR, 2D NOESY and luminescence spectroscopy. Interestingly, the presence of the pyrene moiety in the structure rendered these AGs intrinsically fluorescent, which was quenched upon successful integration of the SWNTs within the gel. The prepared hydroand organogels along with their SWNT-integrated nanocomposites are thermoreversible in nature. The supramolecular morphologies of the dried gels and SWNT–gel nanocomposites have been studied by transmission electron microscopy, fluorescence microscopy and polarising optical microscopy, which confirmed the presence of three-dimensional self-assembled fibrillar networks (SAFINs) as well as the integrated SWNTs. Importantly, rheological studies revealed that the inclusion of SWNTs within the ambidextrous gels improved the mechanical rigidity of the resulting soft nanocomposites up to 3.8-fold relative to the native gels
机译：随着超分子软材料的发展迅速，具有通过相同结构支架固定水和有机溶剂的能力的低分子量胶凝剂（LMWG）的例子非常有限。在本文中，我们报告了含of的基于肽的灵巧胶凝剂（AGs）的开发，该胶凝剂具有有效胶凝有机和水性溶剂的能力。在某些酸性pH值（pH 2.0-4.0）下，这些胶凝剂的有机和水凝胶效率在各种有机溶剂中为0.7–1.1％w / v，在水中为0.5–5％w / v。此外，首次将AG用于在水凝胶和有机凝胶基质中制备含单壁碳纳米管（SWNT）的软纳米复合材料。通过圆二色性，FTIR，可变温度NMR，2D NOESY和发光光谱，详细研究了自组装胶凝过程中不同的非共价相互作用（例如氢键，疏水性，p-p和van der Waals相互作用）的影响。有趣的是，结构中of部分的存在使这些AG具有固有的荧光性，将SWNT成功整合到凝胶中后将其淬灭。制备的水凝胶和有机凝胶及其与SWNT集成的纳米复合材料本质上是可热逆的。已通过透射电子显微镜，荧光显微镜和偏振光学显微镜研究了干燥凝胶和SWNT-凝胶纳米复合材料的超分子形态，证实了三维自组装纤维网络（SAFIN）以及集成的SWNT的存在。重要的是，流变学研究表明，在两手凝胶中加入单壁碳纳米管可将所得软纳米复合材料的机械刚性提高至相对于天然凝胶高达3.8倍

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