The effect of adsorbed volatile organic compounds on an ultrathin water film measurement

Authors

Shahab Bayani Ahangar, Michigan Technological UniversityFollow
Chan Ho Jeong, Chung-Ang University
Fei Long, Michigan Technological UniversityFollow
Jeffrey S. Allen, Michigan Technological UniversityFollow
Seong Hyuk Lee, Chung-Ang University
Chang Kyoung Choi, Michigan Technological UniversityFollow

Document Type

Article

Publication Date

8-29-2020

Department

Department of Mechanical Engineering-Engineering Mechanics

Abstract

Using surface plasmon resonance imaging (SPRi), we have recently shown for the first time the existence of a monolayer water film between droplets during dropwise condensation. This study examines the effect of adsorbed volatile organic compounds (VOCs) on the ultrathin film measurement using SPRi. Further, the work presents the proper surface-treatment process that enables measurements of the ultrathin water layer during high-speed imaging of dropwise condensation at 3000 frame per second. In this study, two methods were applied for cleaning the surface (gold-coated glass)-(1) standard cleaning procedure (SCP) using acetone, isopropyl alcohol, and deionized water and (2) SCP followed by air plasma cleaning. This work discusses the effect of the cleaning procedures on surface roughness, contact angle, and surface chemistry using atomic force microscopy, optical microscopy, and an X-ray photoelectron spectroscope meter. The results showed that SCP before the SPRi is a proper surface-treatment method. The effect of adsorbed VOCs during dropwise condensation on a surface treated with SCP was measured to be 0.0025 (reflectivity unit), which was 70% smaller than the reflectance associated with a monolayer water film. The results of this work confirm a monolayer water film observation during the dropwise condensation, which has been reported before.

Publisher's Statement

© 2020 by the authors. Publisher’s version of record: https://doi.org/10.3390/app10175981

Publication Title

Applied Sciences (Switzerland)

Recommended Citation

Ahangar, S. B., Jeong, C., Long, F., Allen, J., Lee, S., & Choi, C. (2020). The effect of adsorbed volatile organic compounds on an ultrathin water film measurement. Applied Sciences (Switzerland), 10(17). http://doi.org/10.3390/app10175981
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/2798

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Version

Publisher's PDF