Japan Geoscience Union Meeting 2023

Presentation information

[J] Online Poster

A (Atmospheric and Hydrospheric Sciences ) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS07] Atmospheric Chemistry

Tue. May 23, 2023 9:00 AM - 10:30 AM Online Poster Zoom Room (3) (Online Poster)

convener:Yosuke Sakamoto(Kyoto University Graduate School of Global Environmental Studies), Risa Uchida(Japan Automobile Research Institute), Shigeyuki Ishidoya(Advanced Industrial Science and Technology), Yoko Iwamoto(Graduate School of Integrated Sciences for Life, Hiroshima University)

On-site poster schedule(2023/5/22 17:15-18:45)

9:00 AM - 10:30 AM

[AAS07-P19] In-situ Surface Tension Measurements of Atmospheric Aerosol Particles

*Gen Masao1, Hibara Akihide1 (1.Tohoku University)

Keywords:Aerosol, Surface tension, Cloud formation

The surface tension of aerosol particles can potentially affect aerosols' growth (activation) into cloud droplets. Hence, the challenge of directly measuring the surface tensions of aerosol particles is essential. Here, we report in-situ surface tension measurements based on a linear quadrupole electrodynamic balance (EDB) coupled with the quasi-elastic light scattering (QELS) method. The EDB-QELS is validated using surface tension measurements of atmospherically relevant inorganic and organic droplets. The surface tension results are in reasonable agreement with the reference values in the range of ~50–90 mN m–1. We find a significant size dependence for sodium chloride droplets containing surface-active species (sodium dodecyl sulfate) in the size range of ~5–18 µm. The surface tension increases from ~55 to 80 mN m–1 with decreased size. Dynamic surface tensions of droplets during changing relative humidity reveal the onset of liquid-liquid phase separation. The approach can offer systematic surface tension measurements of atmospheric aerosol particles, which is needed to predict the surface tensions of droplets until activation.