| AVS 54th International Symposium | |
| Plasma Science and Technology | Thursday Sessions |
| Session PS-ThP |
| Session: | Plasma Science and Technology Poster Session |
| Presenter: | C. Miron, Nagoya University, Japan |
| Authors: | C. Miron, Nagoya University, Japan M.A. Bratescu, Nagoya University, Japan T. Ishizaki, Nagoya University, Japan N. Saito, Nagoya University, Japan O. Takai, Nagoya University, Japan |
| Correspondent: | Click to Email |
Electrical discharges in water are used for generation of ozone, oxygen, hydroxyl radicals and other chemically active species. These reactive species leads to favorable conditions for synthesis, as well as degradation of compounds. Therefore, electrical discharges have found applications in metal nanoparticles synthesis, water disinfection, biomedical applications. Numerous works have also presented concerning the electrical behavior of water subjected to high electric fields. Despite the progress, there is not yet a complete understanding of issues relating to the breakdown initiation process and the physics of charge creation in liquids. In this study, we investigate electrical and optical properties of a discharge process in water. Time resolved optical emission spectroscopy method is used to determine the reactive species generated in the aqueous system. An electrical discharge process in ultrapure water was generated between two cylindrical electrodes in a plastic vessel. Electrodes of different diameters and materials were used in the process. The electrical discharge conditions were varied in order to determine the evolution of reactive species generated in the water. The breakdown voltage and also the electrical current applied in the discharge were observed to be modified when using different materials of the electrodes and different interelectrode gaps, thus changing the plasma behavior. The water conductivity and pH values were also changed, depending on the electrode material used in the discharge process. The time emission spectra of hydrogen, oxygen atoms and hydroxyl radicals were studied in dependence with discharge voltage, pulse width, repetition frequency. A detailed analysis of different emission lines after the ignition of the high voltage pulse was realized, with modifying the voltage, pulse width, and repetition frequency.