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首页> 外文期刊>ACS Macro Letters >Rayleigh Instability Induced Cylinder-to-Sphere Transition in Block Copolymer Micelles: Direct Visualization of the Kinetic Pathway
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Rayleigh Instability Induced Cylinder-to-Sphere Transition in Block Copolymer Micelles: Direct Visualization of the Kinetic Pathway

机译：嵌段共聚物胶束中瑞利不稳定性诱导的圆柱到球形过渡：动力学途径的直接可视化

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摘要

Direct visualization of morphological evolution remains extremely challenging despite its critical importance to understand the basic fundamentals behind the transition. Here we report on the detailed observation of a spontaneous cylinder-to-sphere morphological transformation of amphiphilic poly(2-vinylpyridine)-b-poly(ethylene oxide) (P2VP-b- PEO) diblock copolymer micelles in aqueous solution, which first provides experimental evidence that the fragmentation pathway is driven by Rayleigh instability showing the distinctive signatures during the transition. Owing to the instability of cylindrical micelles and the fluidity of micellar cores, our results show that the cylindrical micelles spontaneously undulate and transform into spherical micelles through distinct intermediate states, including undulated cylinders and pearl-necklace-like micelles with a perfect sinusoidal wave throughout the length. Moreover, the present system with transitional morphology is proved to be able to act as a model to encapsulate hydrophobic guests in the micellar cores, which displays a relatively sustained release behavior. The specific kinetic pathway provides new insight into the mechanism of block copolymer micellar morphological transition; meanwhile, the dynamic system might serve as a promising candidate for unique nanostructure design as well as contribute to the transition-coupled guest delivery and controlled release.
机译：尽管形态演化的直接可视化对于理解过渡背后的基本原理至关重要，但直接可视化仍然极具挑战性。在这里我们报告的两亲的聚（2-乙烯基吡啶）-b-聚（环氧乙烷）（P2VP-b-PEO）二嵌段共聚物胶束在水溶液中自发圆柱到球形形态转变的详细观察，这首先提供了实验证据表明，碎裂途径是由瑞利不稳定性驱动的，显示了过渡过程中的独特特征。由于圆柱形胶束的不稳定性和胶束核心的流动性，我们的结果表明，圆柱形胶束通过不同的中间状态自发地起伏并转变为球形胶束，包括起伏的圆柱体和整个过程中具有完美正弦波的珍珠项链状胶束长度。此外，具有过渡形态的本系统被证明能够充当将疏水性客体包封在胶束核心中的模型，其表现出相对持续的释放行为。特定的动力学途径为嵌段共聚物胶束形态转变的机理提供了新的认识。同时，该动态系统可能是独特的纳米结构设计的有希望的候选者，并且有助于过渡耦合的客体递送和控释。

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