Plasma Interactions with Organic Materials in Liquid through Plasma/Liquid Interface

Abstract

Plasma interactions with organic materials through the plasma/liquid interface as fundamental processes in plasma medicine have been investigated by degradation of methylene blue (MB) by irradiating with Ar/water mixture plasma. The optical emission spectra of Ar/water mixture plasma show considerable emissions of Ar lines, and the emission of H and OH radicals attributed to dissociation of water (H2O) in Ar/water mixture plasma has been confirmed. Variation in the molecular structure of MB in aqueous solution treated with the plasma has been observed by Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The results obtained from FT-IR and XPS analyses show that the Ar/water plasma exposure enables the degradation of organic materials in solution owing to oxidation by irradiated radicals from plasma through the plasma/liquid interface.

Cold atmospheric plasma enhances osteoblast differentiation

“…In recent years, as an emerging field, plasma medicine has been widely developed for various applications such as medical equipment sterilization [ 5 , 6 ], gene transfection [ 7 ], cell proliferation [ 8 ], and wound healing [ 9 ]. These non-thermal plasmas support the direct treatment of biological systems without the thermal damage that can occur when using conventional thermal plasma.…”

Reaction mechanisms of methylene-blue degradation in three-dimensionally integrated micro-solution plasma

“…23) Takenaka and Setsuhara applied X-ray photoelectron spectroscopy (XPS) together with FTIR. 24) Although FTIR and XPS are powerful tools for analyzing the overall chemical composition of a material, they do not give us information on molecules existing in a medium. On the other hand, mass spectrometry is one of the solutions for distinguishing molecules in a medium.…”

Control of reactive oxygen and nitrogen species production in liquid by nonthermal plasma jet with controlled surrounding gas

“…However, controlling the production of these species in a nonthermal plasma jet is difficult because their production is strongly dependent on the concentrations of nitrogen and oxygen from ambient air in the plasma jet. Moreover, for biomedical applications of nonthermal plasma jets, it is essential to control ROS and RNS production in an aqueous solution, [6][7][8][9] because the cellular tissue is covered by an aqueous solution, and various cells are activated by ROS and RNS in an aqueous solution. We have focused on the control of ROS and RNS production in a liquid by the irradiation of an atmospheric nonthermal plasma jet.…”