1434 動的表面張力と気体の拡散抵抗を考慮したマイクロバブルの安定性解析(S38-2 気泡・粒子,S38 マイクロ・ナノフルイズ)

概要

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The influence of gas diffusion is investigated for two kinds of microbubbles. It is shown that a tiny microbubble shrinks accompanied with large surface depression, and does not return to the initial size even after the pressure is reduced. On the other hand, a large microbubble shrinks nearly spherically. The depression of bubble surface suggests the formation of multilayers of surfactant or lipid on bubble surface. A bubble model is also constructed by considering the dynamic surface tension and gas permeation resistance of surfactant or lipid layers. The experimental results are compared with simulations based on the model. The results show that the dynamic surface tension is a significant factor to determine the bubble profile. The results also show that the increase of the permeation resistance during bubble shrinkage stabilizes microbubbles.
2007-09-07