Surface Analytical Analysis of Atmospheric Reactions on Sessile Droplets

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In the second year of the project the following progress and accomplishments were made:1. An advanced experimental apparatus was designed and implemented for controlling the atmosphere that sessile droplets are exposed to during QELS measurement (monitoring of their surface tension). This setup was incorporated to the current experimental setup for measuring surface tension of sessile droplets.2. The technique/experimental setup described above is unique and has allowed the generation of new and insightful experimental data. The trend in surface tension value of micrometer sized sessile drops was monitored during exposure to atmospheric surfactants, revealing new experimental data on how surface tension can be affected.3. The data that has been obtained so far in the project was presented at the Spring Meeting of the ACS at Indianapolis USA on March 28, 2023. The title of the presentation was "Surface tension monitoring of single aerosol and sessile droplets exposed to hydrophobic organic compounds using the quasi-elastic laser scattering technique", with the following authors "Derrick Mott, Carlos Baptista, Yize Zhang, Jason Nyoto, Atika Nur Rochmah, Masao Gen, Mao Fukuyama and Akihide Hibara". The project has already aided in the education of many students and the presentation itself was well received by attendees. Experts in the field of atmospheric science were able to discuss the results and provide feedback and future experimental direction.