Ordered-to-Disordered Transformation of Enhanced Water Structure on Hydrophobic Surfaces in Concentrated Alcohol-Water Solutions
Ordered-to-Disordered Transformation of Enhanced Water Structure on Hydrophobic Surfaces in Concentrated Alcohol-Water Solutions
复制标题
浓醇水溶液中疏水表面增强水结构的有序到无序转变
DOI：
10.1021/acs.jpclett.9b03429
复制
发表时间：
2019-12-19
影响因子：
5.7
通讯作者：
Zheng, Junrong
中科院分区：
文献类型：
--
作者：
Deng, Gang-Hua;Shen, Yuneng;Zheng, Junrong
疏水溶质对周围水结构的影响一直是近70年来争论的话题。然而，一个一致的描述的物理洞察的原因，异常的热力学性质的醇-水混合物是缺乏的。在这里，我们报告的实验结果相结合的温度依赖性的线性和飞秒红外光谱测量，以探索在浓醇水溶液中的水结构转变。实验表明，在室温下，溶液中的微疏水界面周围的水结构的增强。随着温度的升高，这种有序的水结构消失和表面形貌依赖的新的无序的水结构出现在大醇的浓溶液。水的结构转变不仅取决于烷基链的长度，而且还取决于醇的聚集。一个比水更有序的结构可以转变成一个比水更不有序的结构。
The effects of hydrophobic solutes on the structure of the surrounding water have been a topic of debate for almost 70 years. However, a consistent description of the physical insight into the causes of the anomalous thermodynamic properties of alcohol-water mixtures is lacking. Here we report experimental results that combined temperature-dependent linear and femtosecond infrared spectroscopy measurements to explore the water structural transformation in concentrated alcohol-water solutions. Experiments show that the enhancement of water structure arises around microhydrophobic interfaces at room temperature in the solutions. As temperature increases, this ordered water structure disappears and a surface topography-dependent new disordered water structure arises at concentrated solutions of large alcohols. The water structural transformation is dependent on not only the length of the alkyl chain but also the clustering of the alcohols. A more-ordered-than-water structure can transform into a less-ordered-than-water structure.