Simultaneous measurement of liquid surface tension and contact angle by light reflection
| Autor: | Wu Shengbo, Shi Bo, Luo Daobin, Qian Lailai, Juan Wang, Yue Zongmin, Peng Shao, Liangwei Dong, Qin Yipan |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
business.industry 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Dark field microscopy Atomic and Molecular Physics and Optics Collimated light Condensed Matter::Soft Condensed Matter Physics::Fluid Dynamics 010309 optics Contact angle Surface tension Optics Fiber optic sensor Surface wave 0103 physical sciences Wetting 0210 nano-technology business Beam (structure) |
| Zdroj: | Optics express. 27(12) |
| ISSN: | 1094-4087 |
| Popis: | We present an optical method of simultaneous measurement of liquid surface tension, contact angle, and the curved liquid surface shape, which uses the light reflection from this liquid surface due to the wettability. When an expanded and collimated laser beam is incident upon the curved liquid surfaces vertically, the special light reflection pattern, which includes a dark central region and a bright field outside, was observed. A critical spot on the curved liquid surface was found, and the dark field distribution is related to both the width of incidence beam and this critical spot. In our experiment, the different dark field distribution patterns were recorded when the width of the incidence beam changed. The liquid surface tension, contact angle, and the liquid surface shape were measured simultaneously. The proposed method is a new effective tool for present wetting characterization methods. |
| Databáze: | OpenAIRE |
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