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

In this study, the concentration gradient inside evaporating binary sessile droplets of 30, 50, and 60 vol % tetrahydrofuran (THF)/water mixtures was investigated. The 5 μL THF/water droplets were evaporated on a transparent hydrophobic substrate. This is the first demonstration of local concentrati...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2017-08, Vol.9 (34), p.29157-29166
Main Authors: Cai, Xin, Xie, Ni, Qiu, Zijie, Yang, Junxian, He, Minghao, Wong, Kam Sing, Tang, Ben Zhong, Qiu, Huihe
Format: Article
Language:English
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Summary:In this study, the concentration gradient inside evaporating binary sessile droplets of 30, 50, and 60 vol % tetrahydrofuran (THF)/water mixtures was investigated. The 5 μL 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.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.7b09008