Abstract
Forces acting on thermally generated microbubbles are studied by deriving a general force model. Microbubbles can be steered by moving the laser beam. In previous work, it has been shown that the attractive thermo-capillary force on the microbubble is much larger than the repulsive optical force. Thus the microbubble is attracted toward the laser beam, which has been also observed experimentally. In this work, dynamics of a microbubble is studied by steering microbubbles with a known constant velocity. Thermocapillary force on the microbubble is calculated using a developed model which is based on the experimental velocity values and compared with the thermo-capillary force values obtained from the theory. The effect of the viscous and friction forces are also considered. Microbubbles are generated in a thin container as in our previous work and the container is placed on a motorized translation stage. After the bubble is generated and trapped by the focused laser beam the translational stage is moved with a known velocity until the microbubble is separated from the beam. Then the two thermo-capillary forces are compared as a function of the microbubble (translation stage) velocity.
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