Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
School of Science for Open and Environmental Systems, Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
Ultrasonics. 2014 Aug;54(6):1425-9. doi: 10.1016/j.ultras.2014.03.010. Epub 2014 Apr 1.
It is difficult to control the bubble in a liquid by the external operation, because the behavior of the bubble is controlled in buoyancy and flow of liquid. On the other hand, microbubbles, whose diameter is several decades μm, stably disperse in static liquid because of their small buoyancy and electrical repulsion. When an ultrasound, whose frequency was 2.4 MHz, was irradiated, the milky white microbubbles suspended solution became rapidly clear. In this study, the effects of surfactant addition on the removal of microbubbles from a liquid in an ultrasonic field were investigated. The efficiency of removal of microbubbles decreased with surfactant addition. Surfactant type influenced the size of agglomerated microbubbles, and the efficiency of removal of microbubbles changed. The surface of microbubble was modified by surfactant adsorption, and the steric inhibition influenced the removal of microbubbles.
通过外部操作很难控制液体中的气泡，因为气泡的行为受到液体浮力和流动的控制。另一方面，直径为几十微米的微气泡由于浮力小和电排斥而在静态液体中稳定分散。当照射频率为 2.4MHz 的超声波时，悬浮有乳白色微气泡的溶液迅速变澄清。在这项研究中，考察了在超声波场中添加表面活性剂对去除液体中微气泡的效果。添加表面活性剂会降低微气泡的去除效率。表面活性剂的类型影响聚结微气泡的大小，从而改变微气泡的去除效率。微气泡的表面通过表面活性剂吸附进行改性，空间位阻抑制作用影响微气泡的去除。
