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首页> 外文期刊>Journal of Applied Polymer Science >Universal one-pot, one-step synthesis of core-shell nanocomposites with self-assembled tannic acid shell and their antibacterial and catalytic activities
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Universal one-pot, one-step synthesis of core-shell nanocomposites with self-assembled tannic acid shell and their antibacterial and catalytic activities

机译：通用一锅，具有自组装单宁酸壳的芯壳纳米复合材料的一步合成及其抗菌和催化活性

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Facile synthesis of metal@polymer nanocomposites were achieved using self-assembled tannic acid (TA) shells without crosslinkers. The TA shell was assembled under mildly alkaline conditions in reaction time of 20 min under constant vortexing. Universal synthesis method was demonstrated by the synthesis of Ag@TA and Au@TA nanocomposites. We propose that the shell formation is due to TA undergoing oxidative self-polymerization to poly(tannic acid) or a supramolecular aggregate of oxidized TA held together by charge transfer, hydrogen bond, and - interactions, similar to dopamine polymerization. Gibbs free energy calculations suggest that polymerization is energetically favorable. Synthesized Ag@TA exhibited antibacterial functionality with Escherichia coli minimum inhibitory concentration of 100 mu gmL(-1) up to 48 h. The population of E. coli was also reduced by 99% within 5 h when incubated with 100 mu gmL(-1) of Ag@TA nanocomposite. Au@TA also functions as a reduction catalyst. It reduces 4-nitrophenol to 4-aminophenol in the presence of NaBH4 with a rate constant of k=0.63 min(-1)mol(-1). For comparison, using Au nanoparticles yields a rate constant of 0.14 min(-1)mol(-1). The ease of synthesis renders the nanocomposites superior to others, with potential for large-scale application. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45829.
机译：使用无交联剂的自组装单烷酸（Ta）壳，实现了金属@聚合物纳米复合材料的容易合成。在恒定涡旋下在20分钟的反应时间的温和碱条件下组装Ta壳。通过合成Ag @ Ta和Au @ ta纳米复合材料来证明通用合成方法。我们提出壳体形成是由于TA经历氧化自聚合以聚（单宁酸）或通过电荷转移，氢键和 - 相互作用保持在一起的氧化Ta的超分子聚集体，类似于多巴胺聚合。 Gibbs自由能量计算表明，聚合是充满活力的优势。合成的AG @ TA显示抗菌功能，具有大肠杆菌最低抑制浓度为100μgml（-1）至48小时。当与100μgMML（-1）的Ag @ Ta纳米复合材料温育时，大肠杆菌的群体也在5小时内降低了99％。 AU @ TA也用作还原催化剂。在NaBH 4存在下，将4-硝基苯酚降低至4-氨基苯酚，k = 0.63mm（-1）摩尔（-1）率恒定。为了比较，使用Au纳米颗粒产生0.14 min（-1）摩尔（-1）的速率常数。易于合成使纳米复合材料优于其他，具有大规模应用的潜力。 （c）2017 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2018,135,45829。

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