Bubbles at contaminated water interfaces

Upon burst, surface bubbles emit droplets that disperse chemicals and pathogens in the air. Water properties affect the physics governing such bubbles, thus affecting the droplets they emit. Yet, the effect of water composition on bubble physics remains little understood. From natural bacterial contamination to controlled contamination, we present the results of a combined experimental and theoretical study of the life of bubbles at contaminated interfaces, with a focus on the physics governing their thinning. We show that the presence of bacteria at the water-air interface has an important effect on the lifetime and thinning of bubbles. We quantify this effect and validate a model that allows to elucidate the observed dynamics. We discuss how bacteria interestingly alter the bubble physics in a manner that can ultimately enhance their own water-to-air dispersal.