Dynamic Assemblies of Molecular Motor Amphiphiles Control Macroscopic Foam Properties,Journal of the American Chemical Society

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Dynamic Assemblies of Molecular Motor Amphiphiles Control Macroscopic Foam Properties
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2020-05-07 , DOI: 10.1021/jacs.0c03153
Shaoyu Chen _{1,

2} , Franco King-Chi Leung ₁ , Marc C A Stuart ₁ , Chaoxia Wang ₂ , Ben L Feringa ₁

Affiliation

Stimuli-responsive supramolecular assemblies controlling macroscopic transformations with high structural fluidity, i.e., foam properties, have attractive prospects for applications in soft materials ranging from biomedical systems to industrial processes, e.g., textile coloring. However, identifying the key processes for the amplification of molecular motion to a macroscopic level response is of fundamental importance for exerting the full potential of macroscopic structural transformations by external stimuli. Herein, we demonstrate the control of dynamic supramolecular assemblies in aqueous media and as a consequence their macroscopic foam properties, e.g., foamability and foam stability, by large geometrical transformations of dual light/heat stimuli-responsive molecular motor amphiphiles. Detailed insight into the reversible photoisomerization and thermal helix inversion at the molecular level, supramolecular assembly transformations at the microscopic level, and the stimuli-responsive foam properties at the macroscopic level, as determined by UV–vis absorption and NMR spectroscopies, electron microscopy, and foamability and in situ surface tension measurements, is presented. By selective use of external stimuli, e.g., light or heat, multiple states and properties of macroscopic foams can be controlled with very dilute aqueous solutions of the motor amphiphiles (0.2 weight%), demonstrating the potential of multiple stimuli-responsive supramolecular systems based on an identical molecular amphiphile and providing opportunities for future soft materials.

中文翻译：

分子马达两亲物的动态组装控制宏观泡沫特性

具有高结构流动性（即泡沫特性）控制宏观转变的刺激响应性超分子组装体在从生物医学系统到工业过程（例如纺织品着色）的软材料中具有诱人的应用前景。然而，确定分子运动放大到宏观水平响应的关键过程对于充分发挥外部刺激宏观结构转变的潜力至关重要。在此，我们证明了通过双光/热刺激响应分子马达两亲物的大几何变换来控制水介质中的动态超分子组装体，从而控制其宏观泡沫特性，例如发泡性和泡沫稳定性。详细了解分子水平上的可逆光异构化和热螺旋反转、微观水平上的超分子组装转变以及宏观水平上的刺激响应泡沫特性，如通过紫外-可见吸收和核磁共振光谱、电子显微镜和提出了发泡性和原位表面张力测量。通过选择性地使用外部刺激，例如光或热，可以用非常稀的运动两亲物水溶液（0.2重量%）来控制宏观泡沫的多种状态和性质，这证明了基于多种刺激响应的超分子系统的潜力相同的分子两亲物，为未来的软材料提供了机会。

更新日期：2020-05-07

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