Abstract:

Marangoni phenomenon was first identified in the so-called "tears of wine" by physicist James Thomson in 1855. Since his observation, it has been extensively discussed and applied to a myriad of applications including material migration, mixing, coating and cleaning. In this talk, using the solutal Marangoni effects inspired by wine, we control a flow pattern and enhance mixing efficiency in a sessile droplet without using any active external device. For a model problem, we use vapors of alcohol liquid to generate the surface tension gradient of the droplet surface. We investigate experimentally and theoretically how the vapor-driven solutal Marangoni flow inside a sessile droplet are created. The idea is also extended to the uniform coating application for the key element of a display. We believe that the solutal Marangoni effect can impact on various microfluidics applications.

Biography:

- Bachelor degree (2006), Kumoh National Institute of Technology (South Korea)

-  Master degree (2008), KAIST (South Korea)

- PhD degree (2013), TU Delft (NL)

- Postdoc (2013-2016), Howard Stone group in Princeton University (USA)

- Assistant professor (2017-present), Mechanical Engineering, KAIST (South Korea)