Yeuhan Yao | Dropwise Condensation on a Hydrophobic Bump



Name: Yeuhan Yao
Picture title: Dropwise Condensation on a Hydrophobic Bump
Category: Manmade
Occupation: PhD student

Yeuhan says:
‘I am a PhD student in Materials Science and Engineering at Northwestern University, USA. The image was taken for one of my research projects in the lab where I was studying condensation of water on a hydrophobic aluminum surface. Moisture in the air condensed on the cooled surface, beading like pearls instead of spreading out due to its water repellant nature. Each droplet is less than 1mm in diameter.

The protruding bump on the surface is revealed by the big circle in the image. In order to get the bump’s apex and surrounding flat regions in focus I used a small aperture. As the water and aluminium are so reflective it was a challenge to achieve a uniform illumination that was strong enough without causing too much glare.’

Technical information:
Nikon D5500
Nikon AF-S DX Micro-NIKKOR 40mm f/2.8G
ISO 800
1/800 sec
Accessories: Ring-LED for illumination, a tripod.
Post processing: ImageJ to adjust brightness and contrast.

Facebook: Yuehan Yao