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Fluorescent polycatecholamine nanostructures as a versatile probe for multiphase systems

机译：荧光聚儿茶酚胺纳米结构作为多相系统的多功能探针

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Shape and size controlled nanostructures are critical for nanotechnology and have versatile applications in understanding interfacial phenomena of various multi-phase systems. Facile synthesis of fluorescent nanostructures remains a challenge from conventional precursors. In this study, bio-inspired catecholamines, dopamine (DA), epinephrine (EP) and levodopa (LDA), were used as precursors and fluorescent nanostructures were synthesized via a simple one pot method in a water–alcohol mixture under alkaline conditions. DA and EP formed fluorescent spheres and petal shaped structures respectively over a broad spectrum excitation wavelength, whereas LDA did not form any particular structure. However, the polyepinephrine (PEP) micropetals were formed by weaker interactions as compared to covalently linked polydopamine (PDA) nanospheres, as revealed by NMR studies. Application of these fluorescent structures was illustrated by their adsorption behavior at the oil/water interface using laser scanning confocal microscopy. Interestingly, PDA nanospheres showed complete coverage of the oil/water interface despite its hydrophilic nature, as compared to hydrophobic PEP micropetals which showed a transient coverage of the oil/water interface but mainly self-aggregated in the water phase. The reported unique fluorescent organic structures will play a key role in understanding various multi-phase systems used in aerospace, biomedical, electronics and energy applications.
机译：形状和尺寸受控的纳米结构对于纳米技术至关重要，在理解各种多相系统的界面现象方面具有广泛的应用。荧光纳米结构的容易合成仍然是常规前体的挑战。在这项研究中，以生物启发的儿茶酚胺，多巴胺（DA），肾上腺素（EP）和左旋多巴（LDA）为前体，并通过简单的一锅法在碱性条件下的水-醇混合物中合成了荧光纳米结构。 DA和EP分别在宽光谱激发波长上形成荧光球和花瓣状结构，而LDA没有形成任何特定结构。但是，如NMR研究所示，与共价连接的聚多巴胺（PDA）纳米球相比，聚肾上腺素（PEP）花瓣是由较弱的相互作用形成的。这些荧光结构的应用通过使用激光扫描共聚焦显微镜在油/水界面的吸附行为来说明。有趣的是，与疏水性PEP花瓣相比，PDA纳米球尽管具有亲水性，但仍显示出油/水界面的完全覆盖，而疏水性PEP花瓣却显示出油/水界面的瞬时覆盖，但主要在水相中自聚集。报告的独特的荧光有机结构将在理解航空航天，生物医学，电子和能源应用中使用的各种多相系统中发挥关键作用。

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