超音波を応用した微量液の非接触攪拌技術

概要

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We have developed a new mixing method for micro-liquid. It is well known that the free surface of a liquid is pushed out when ultrasound propagating in the liquid reaches the free surface. This phenomenon is due to the radiation presure caused by ultrasound. In the new method this pressure is used to mix liquid in a vessel without the need to contact with the liquid. The developed mixing system based on this method consists of a vessel that liquid to be mixed and two ultrasound sources (frequency : 1.6 MHz) arranged outside the vessel. One of them radiates through the bottom, the other through the side wall of the vessel. The latter sound source is divided into several segments. And the fine position of the sound source corresponding to the level of liquid is adjusted by selecting the appropriate segments. The mixing performance is evaluated according to the difference between the Two local transmissibilities of laser beam in the liquid. As a result, we confirmed that by using our mixing method, the liquid(water:80-160 μl and dye:4μl) became homogeneous within 1.0 s.
社団法人日本機械学会の論文
2000-12-25