Aggregation-Induced Emission Luminogen-Based Direct Visualization of Concentration Gradient Inside an Evaporating Binary Sessile Droplet

作者：Cai, Xin; Xie, Ni; Qiu, Zijie; Yang, Junxian; He, Minghao; Wong, Kam Sing; Tang, Ben Zhong^*; Qiu, Huihe^*

来源：ACS Applied Materials & Interfaces, 2017, 9(34): 29157-29166.

DOI：10.1021/acsami.7b09008

• binary droplet
• evaporation
• different volatilities
• concentration gradient
• AIE

In this study, the concentration gradient inside evaporating binary sessile droplets of 30, 50, and 60 vol % tetrahydrofuran (THF)/water mitt-tires was investigated. The 5 mu L THF/water droplets were evaporated on a transparent hydrophobic substrate. This is the first demonstration of-local concentration mapping within an evaporating binary droplet utilizing the aggregation-induced emission material. During the first two evaporation stages of the binary droplet, the local concentration can be directly visualized by the change of fluorescence emission intensity. Time-resolved average and local concentrations can be estimated by using the pre-established function of fluorescence intensity versus water volume fraction.

• 出版日期2017-8-30
• 单位香港科技大学深圳研究院; 神经科学国家重点实验室; 华南理工大学; 发光材料与器件国家重点实验室; 香港科技大学