MATEC Web Conf.
Volume 333, 2021The 18th Asian Pacific Confederation of Chemical Engineering Congress (APCChE 2019)
|Number of page(s)||5|
|Section||Physical Properties and Physical Chemistry|
|Published online||08 January 2021|
Study on the Method of Identifying Ultrafine Bubbles Using Ultrasound under the Presence of Solid Nanoparticles
Advanced Course of Material Engineering, National Institute of Technology (KOSEN), Kochi College, 200-1 Monobe, Nankoku, Kochi, 783-8508, Japan
2 Department of Social Design Engineering, National Institute of Technology (KOSEN), Kochi College, 200-1 Monobe, Nankoku, Kochi, 783-8508, Japan
* Corresponding author: email@example.com
The method of making OH radicals generated by the collapse of ultrafine bubbles as an indicator when applying ultrasound was examined as the method of identifying ultrafine bubbles less than 1 μm in diameter under the presence of mixed solid nanoparticles. First, potassium iodide (KI) method was used to evaluate OH radicals. Since difference in absorbance due to OH radicals generated by the collapse of ultrafine bubbles is very small when using air as contained gas, evaluation using the KI method was difficult; however, a distinct difference in absorbance was confirmed by increasing the amount of OH radicals generated by using ozone as contained gas. Moreover, the higher the ultrasound frequency, the greater the difference in absorbance. On the other hand, a luminescence phenomenon related to the collapse of ultrafine bubbles by ultrasound was confirmed with sonoluminescence observation, confirming further that the luminescence intensity of water added with solid particles of the same diameter and number density as those of ultrafine bubbles is smaller than that of ultrafine bubble water.
© The Authors, published by EDP Sciences, 2021
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