Low-temperature argon plasma jet with cascading electrode technique for biological applications

Abstract

In this study, the design, performance, and characteristics of a low-temperature argon plasma jet with cascading electrode technique (APJCE) are presented. APJCE is designed based on a tip-ring structure with a cascading ring. The effect of plasma jet driven by repetitive high-voltage microsecond pulses in APJCE structure was measured qualitatively in local surface temperature detection system. Then, by applying the generated plasma jet to biological surface and measuring and characterizing the electrical parameters, we obtained a plasma jet, which is electrically and thermally in the cold plasma regime. Simulation of the electric field distribution in the nozzle also yielded similar results to the experimental results. Finally, by cascading electrodes, we guided the plasma column to the nozzle output so that the plasma temperature within four centimeters of the nozzle output is 37 °C. The resulting plasma jets were studied by atomic emission spectroscopy and the intensity of the spectral lines of the atmospheric argon plasma jet spectra was obtained as a final experimental result at the output.

Instant switching control between two types of plasma-driven liquid flows

“…In experimental results suggesting that an unusual spectral change has an important effect on the change in liquid flows, the emission spectra were dominated by excited OH (309 nm), excited molecular N 2 (315-380 nm, 2nd positive system), and excited atomic Ar (around 420 nm, 700-840 nm). [27][28][29][30][31][32] As the frequency increased from 4 to 10 kHz, the emission intensities of excited OH and excited molecular N 2 decreased while those of excited atomic Ar increased. Therefore, the plasma-driven liquid flows can be controlled by adjusting the active species supplied to the liquid surface.…”

“…Figures 5(a) and 5(b) show the emission spectra in the 300-440 nm (exposure time = 1000 ms) and the 700-840 nm (exposure time = 20 ms) wavelength ranges, respectively.The emission spectra were minor in the 440-700 nm wavelength range. In experimental results suggesting that an unusual spectral change has an important effect on the change in liquid flows, the emission spectra were dominated by excited OH (309 nm), excited molecular N 2 (315-380 nm, 2nd positive system), and excited atomic Ar (around 420 nm, 700-840 nm) [27][28][29][30][31][32]. As the frequency increased from 4 to 10 kHz, the emission intensities of excited OH and excited molecular N 2 decreased while those of excited atomic Ar increased.…”