| Tue July 9th 2019 16:00 – 17:00 HT 500B | Seminar | The challenge of accurate characterization of surface wetting Robin Ras |
Details:Wetting is typically characterized from a sessile droplet by evaluating the angle at the contact line where liquid, air and solid meet. Contact angle goniometry is considered as the gold standard of wetting characterization, however, is prone to inaccuracies, especially towards high contact angles. In this talk, I will describe the problem and present state-of-the-art methodologies for evaluating wetting of hydrophobic surfaces with enhanced accuracy. Oscillations of magnetic water droplets allow measurement of friction forces between droplet and surface with nanonewton sensitivity. Adhesion forces between droplet and surface can be measured by scanning droplet adhesion microscopy with sensitivity down to nanonewton. | ||
