[17p-A32-1~13] 3.1 Basic optics and frontier of optics

1:45 PM - 2:00 PM JST(4:45 AM - 5:00 AM UTC)

[17p-A32-2] Effects of nanostructures on the surface of photothermal thin films on evaporation and Marangoni convection

〇Rui Zhuo¹, Kyoko Namura¹, Motofumi Suzuki¹ (1.Kyoto Univ.)

Keywords:

Photothermal,Microfluidic,Nanostructured thin films

The investigation focused on the generation of Marangoni convection and the effect of surface structures by irradiating a photothermal conversion thin film with a laser. SiO2 nanocolumns were fabricated on an FeSi2 thin film using a dynamic oblique deposition method, and a fluid cell enclosing a pure water droplet was used. The temporal change in flow velocity was measured, revealing that convection developed more rapidly in the presence of the columnar structures. Surface temperature was calculated, demonstrating that evaporation contributed more to the interface temperature rise than thermal conduction. The effect of the column structure was thought to be due to the latent heat of evaporation efficiently increasing the interface temperature.