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Optimize ultrasound condition for water treatment by coiled-up space metamaterial

Ultrasonic wave can be widely used for water treatment; however, the efficiency is low compared to the input power used to generate the ultrasonic wave. To address this problem, the coiled-up space metamaterial, a zig-zag like spatial structure that can amplify the acoustic wave by creating the resonance, was adopted. The model structure of metamaterial with the optimized parameters found by using FEM simulation was fabricated with a 3D printer in order to test the advantage of this structure. The fabricated structure was submerged into the potassium iodide solution, and we compared the KI (aq) dosimetry result between the solution with and without the structure. As a result, we found that the coiled-up space metamaterial can increase the efficiency of the ultrasonic water treatment by 41% under the resonance condition of the container of the target solution. This result implies that the application of the coiled-up space into water treatment can increase the efficiency dramatically. The result can be widely implemented into ultrasonic cleansing and cell death induction as well.