Interfacial nanobububbles and their impact on substrates

Par Yuliang Wang, Professor, School of Mechanical Engineering and Automation, Beihang University, China

Mardi 13 Février, 14h, Salle des séminaires (215), 2ème étage, Bâtiment A4N

Abstract :

During wetting of a hydrophobic surface with an aqueous solution, spherical-cap-shaped interfacial bubbles with heights between 5 nm and 100 nm and diameters between 50 nm and 800 nm can be nucleated. They are normally referred to as surface or interfacial nanobubbles (NBs). NBs have great potential in numerous applications, such as drug delivery, ultrasonic tumor imaging enhancement, mineral flotation and separation, nanostructured surface fabrication.
This talk focuses on the experimental investigation of interfacial NBs using atomic force microscopes. It starts with the morphological characterization of NBs. After that, the nucleation of NBs on nanostructured surfaces will be presented. The results show that the nanobubble nucleation can be tuned by surface nanostructures, regarding size, location, or even morphology. Our study also shows that the NBs have large impact on sample substrates. They can generate nanostructures on polystyrene (PS) films, with tunable size and shape of nanostructures. The mechanism of nanobubbles induced nanoindents is revealed.