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

Authors Cai, Xin HKUST affiliated (currently or previously)
Xie, Ni HKUST affiliated (currently or previously)
Qiu, Zijie HKUST affiliated (currently or previously)
Yang, Junxian HKUST affiliated (currently or previously)
He, Minghao HKUST affiliated (currently or previously)
Wong, Kam Sing View this author's profile
Tang, Benzhong View this author's profile
Qiu, Huihe View this author's profile
Issue Date 2017
Source ACS Applied Materials & Interfaces , v. 9, (34), Aug 2017, p. 29157-29166
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.
Language English
Format Article
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