Poster (EARTH)

[PE1-005] Measurement of Particle Size Distribution of Nano-bubbles
by Interactive Force Apparatus

○Yukihiro Muta¹ (1. The University of Tokyo )

Keywords:nano-bubbles, Interactive Force Apparatus , dynamic light scattering

Generally speaking, nano-bubbles in a solution have a diameter of 1 to 100 μm. In addition to their application in the fields of cleaning and water purification, development and utilization in other fields such as the electronic industry, the medical industry, and in the food industry have been reported. However, international discussions continue on basic standards such as bubble specifications of generation mechanism and the size distribution.
Usually the size distribution of nano-bubbles is measured by dynamic light scattering (DLS) method. However, this method is not effective for measuring high concentration of particles suspended in non-transparent liquid. In this research, Interactive Force Apparatus (IFA) was used to conduct the measurement. IFA first arranges bubbles between two electrodes to form a chain-like structure, and then the compressive force is applied to change the chain structure by shortening the distance between electrodes. The repulsive force generated when the chain curved, while the attractive force created when the chain was broken. The cycle of repulsive and attractive forces corresponds to the size of particles. The results obtained with IFA were compared with results obtained from size measurement by analyzing DLS. IFA indicated the comparable results with the one obtained using DLS. According to the results measured by IFA, the average nano-bubble particle size in water is larger than that of kerosene. In addition, the average nano-bubble particle size becomes smaller as time passes.