J054072 ナノバブワのブラウン運動と帯電性の解析([J05407]マイクロ・ナノスケールの熱流体現象(7))

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In this paper, nanobubble shrunk from microbubble generated by electrolysis was observed by optical microscope in order to distinguish a bubble from impurities or contamination in the water. potential, which represents the electric charge of bubbles, was measured by electrophoresis method. Observation of Brownian motion of nanobubble was succeeded by generating bubble which rising velocity was very small. Mean displacement and diameter of nanobubble and ZnO particle was simultaneously measured and compared. As a consequence, mean displacement of bubble is smaller than that of ZnO particle due to different structure of interface. Mean displacement of smaller bubble was closed in the value of ZnO particle because of condensation of ion and impurities at interface. To consider such interface structure, relationship between bubbles diameter and potential was measured. As a result, the absolute value of c potential was decreased when bubble diameter was small in nano scale because the ratio of impurities accounting for interface was increased.
一般社団法人日本機械学会の論文
2011-09-11