| AVS 61st International Symposium & Exhibition | |
| Plasma Science and Technology | Tuesday Sessions |
| Session PS-TuP |
| Session: | Plasma Science and Technology Poster Session |
| Presenter: | Shen-Chieh Lin, National Taiwan University, Taiwan, Republic of China |
| Authors: | S.C. Lin, National Taiwan University, Taiwan, Republic of China C.C. Hsu, National Taiwan University, Taiwan, Republic of China |
| Correspondent: | Click to Email |
In this presentation, the effects of the electrode diameter on the discharge behavior of plasmas in saline solution are studied. The plasma is driven by a bi-polar DC pulse power source with an applied voltage up to 700V and a pulse width above 0.05 ms. The driving electrode is a platinum wire covered by a glass tube to precisely define the area exposed to the solution. Platinum wires of four different diameters, namely 0.1 mm, 0.3 mm, 0.5 mm, and 1 mm, were used. The grounding electrode is a bare platinum wire 0.5 mm in diameter and it is immersed in 0.1 M NaCl solution. Current and voltage probes are used to monitor the current and voltage waveforms across the electrode surface. A high speed camera is used to capture the bubble behavior and plasma appearance. An optical emission spectrometer is used to analyze plasma emission light. It is found that the breakdown voltage decreases with the electrode diameter. At a given applied voltage, the current peak value and the emission time delay upon the onset of the voltage pulse both increase with the electrode diameter, while the power density increases with the decrease in the electrode diameter.