Probing a microviscosity change at the nematic-isotropic liquid crystal phase transition by a ratiometric flapping fluorophore
Probing a microviscosity change at the nematic-isotropic liquid crystal phase transition by a ratiometric flapping fluorophore
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DOI：
10.1039/d1cc06111a
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发表时间：
2022-01-15
影响因子：
4.9
通讯作者：
Saito, Shohei
中科院分区：
文献类型：
--
作者：
Kimura, Ryo;Kitakado, Hidetsugu;Saito, Shohei
了解软凝聚态物质的微粘度对于阐明纳米尺度下发生的化学、物理或生物事件的机制非常重要。在这里，我们报告说，拍打荧光团（FLAP）可以作为微粘度探针能够检测微小的变化。通过比率荧光分析，其中一个FLAP探针检测到几厘泊的宏观粘度变化，发生在热相变的液晶。我们讨论了化学结构对探测能力的影响，以及FLAP分子在基态和激发态的取向。这项工作有助于在实验上提供液晶的分子图像，这通常被视为一个连续体。
Understanding the microviscosity of soft condensed matter is important to clarify the mechanisms of chemical, physical or biological events occurring at the nanoscale. Here, we report that flapping fluorophores (FLAP) can serve as microviscosity probes capable of detecting small changes. By the ratiometric fluorescence analysis, one of the FLAP probes detects a macroscopic viscosity change of a few cP, occurring at the thermal phase transition of a nematic liquid crystal. We discuss the impact of the chemical structure on the detection capability, and the orientation of the FLAP molecules in the ground and excited states. This work contributes to experimentally providing a molecular picture of liquid crystals, which are often viewed as a continuum.