Understanding the convection flows driven by the uneven temperature distribution in heated aqueous solutions is fascinating and meaningful both in fundamental and industrial aspects. Therefore, it is desirable to develop a simple and convenient method for real‐time tracking of surface temperature distribution and the solvent flow state. Herein, we designed and screened a water‐soluble spiropyran derivative (BS‐SP1) that contains benzothiazole and sulfonic acid groups. The BS‐SP1 molecule was found to exceptionally maintain the reversible photochromic characteristics in water, and then served as a photo‐responsive indicator for visualizing the temperature distribution and flow behavior on water surface with high resolution. This study provides feasible guidance on the dynamic self‐assembly and thermodynamics occurring in the water evaporation system and offers a practical tool for investigating these behaviors.

中文翻译：

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使用水溶性螺吡喃对水蒸发过程中的温度分布和流动行为进行可视化

了解加热水溶液中不均匀温度分布驱动的对流在基础和工业方面都是令人着迷且有意义的。因此，需要开发一种简单方便的方法来实时跟踪表面温度分布和溶剂流动状态。在此，我们设计并筛选了一种水溶性螺吡喃衍生物（BS-SP1）含有苯并噻唑和磺酸基团。BS-SP1人们发现该分子在水中异常地保持了可逆的光致变色特性，然后作为光响应指示剂，以高分辨率可视化水面上的温度分布和流动行为。这项研究为水蒸发系统中发生的动态自组装和热力学提供了可行的指导，并为研究这些行为提供了实用的工具。