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    A terahertz transmission imaging based approach for liquid alcohol wettability investigation

    Year: 2018

    Journal: Infrared Phys. Technol., Volume 89, MAR, page 110–114

    Authors: Huang, Hui; Zhao, Hongwei; Zhang, Bo; Su, Yunyun; Jiang, Weixiang; Cai, Bin; You, Guanjun; Ma, Yan

    Organizations: National Nature Science Foundation of China [61501297, 61373004, 61522106, 61377111]; Program of Young Eastern Scholar from Shanghai Institutions of Higher Learning; Key Laboratory of Interfacial Physics and Technology, Chinese Academy of Sciences

    Keywords: Terahertz imaging; Image noise reduction; Polynomial fitting; Wettability

    By using terahertz time-domain spectroscopy (THz-TDS), the transmission spectral images of a series of aliphatic monohydric liquid alcohols were investigated in this work. The image gray value indicated the non-uniform distribution of the liquid. After noise reduction, the depth distribution was computed from the image content, which depended on the wettability of the container surface by the liquid. Then the volume of the liquid crept up to the container surface was compared quantitatively. Our result showed that the surface wettability of the PS container surface by the liquids increased with the alcohol alkyl chain increasing, which was verified by the contact angle of the liquid and the surface. The study indicated that the THz image might offer a potential technique for detecting the wettability of liquid directly without an additional contact angle experiment. (C) 2018 Elsevier B.V. All rights reserved.
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