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首页> 外文期刊>Chemistry: A European journal >Cooperative Self-Assembly-Assisted Formation of Monodisperse Optically Active Spherical and Anisotropic Nanoparticles
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Cooperative Self-Assembly-Assisted Formation of Monodisperse Optically Active Spherical and Anisotropic Nanoparticles

机译：单分散光学活性球形和各向异性纳米粒子的协同自组装辅助形成。

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摘要

We report a new method in which spontaneous self-assembly is employed to synthesize monodisperse polymer nanoparticles with controlled size (<50 nm), shape, tunable functionality, and enhanced solvent and thermal stability. Cooperative noncovalent interactions, such as hydrogen bonding and aromatic p–p stacking, assist selfassembly of amphiphilic macromolecules (polystyrene-block-polyvinylpyridine, PSPVP) and structure directing agents (SDAs) to form both spherical and anisotropic solid polymer nanoparticles with SDAs residing in the particle core surrounded by the polymers. Through detailed investigations by scanning electron microscopy and transmission electron microscopy (TEM), we have rationalized nanoparticle morphology evolution and dependence on factors such as SDA concentration and PVP size. By keeping the PS chain size constant, the particle morphology progresses from continuous films to spherical particles, and on to cylindrical nanowires or rods with increasing the PVP chain size. The final nanoparticles are very stable and can be redispersed in common solvents to form homogenous solutions and thin films of ordered nanoparticle arrays through solvent evaporation processes. These nanoparticles exhibit tunable fluorescent colors (or emissions) depending on the choices of the central SDAs. Our method is simple and general without requiring complicated synthetic chemistry, stabilizing surfactants, or annealing procedures (e.g., temperature or solvent annealing), making scalable synthesis feasible.
机译：我们报告了一种新方法，其中采用自发自组装来合成具有受控尺寸（<50 nm），形状，可调功能以及增强的溶剂和热稳定性的单分散聚合物纳米颗粒。合作的非共价相互作用，例如氢键键合和芳族p–p堆积，可帮助两亲性大分子（聚苯乙烯嵌段-聚乙烯基吡啶，PSPVP）和结构导向剂（SDA）自组装，以形成球形和各向异性的固态聚合物纳米粒子，其中SDA驻留在被聚合物包围的颗粒核。通过扫描电子显微镜和透射电子显微镜（TEM）的详细研究，我们合理化了纳米颗粒的形态演变以及对诸如SDA浓度和PVP大小等因素的依赖性。通过保持PS链大小恒定，随着PVP链大小的增加，颗粒形态会从连续膜发展为球形颗粒，再发展为圆柱形纳米线或棒。最终的纳米粒子非常稳定，可以通过溶剂蒸发过程重新分散在普通溶剂中，以形成均匀的溶液和有序纳米粒子阵列的薄膜。这些纳米粒子显示出可调的荧光色（或发射光），具体取决于中央SDA的选择。我们的方法简单而通用，无需复杂的合成化学，稳定的表面活性剂或退火程序（例如温度或溶剂退火），从而使可扩展的合成成为可能。

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