FIG. 1.
Schematic presentation of the different degrees of immersion of a bacterium upon the passage of an air bubble. The air-liquid interface velocity decreased from panel a to panel c, yielding to different degrees of immersion. d represents the distance between the bacterium and collector surface, φ is the angle giving the position of the particle with respect to the air-liquid interface, θ is the contact angle between the surface of the bacterium and the air-liquid interface, b is the liquid film thickness, γlv is the air-liquid interfacial tension, and Fγ is the surface tension result of the air-liquid interfacial tension exerted by the bend meniscus on the bacterium.