[23a-E103-1~10] 8.5 Plasma phenomena, emerging area of plasmas and their new applications

△ [23a-E103-6] Experimental Detection of Short-Lived Reactive Nitrogen Species Using Plasma-Exposed High-Speed Liquid Flow

〇Kazuki Takeda¹, Shota Sasaki¹, Keisuke Takashima¹, Toshiro Kaneko¹ (1.Grad. Sch. of Eng., Tohoku Univ.)

Keywords:Atmospheric-pressure plasma, Plasma in contact with liquid, Reactive nitrogen species

Atmospheric pressure plasmas in contact with liquid have been extensively investigated for various applications. Many studies show that one of key factors is short-lived reactive nitrogen and oxygen species (RONS) at the plasma-liquid interface. However, the spatial and temporal distribution of short-lived RONS can be hardly characterized due to their high reactivities and non-uniformities at the interface.
In this study, we tried to build new experimental method using a plasma-exposed high-speed liquid flow (~ 10 m/s) for detecting minor short-lived reactive nitrogen species in addition to OH radical. By using the p-hydroxy phenylacetic acid (p-HPA) as a scavenger, we succeeded in observing nitrite precursor(s) and estimating the decay rate with a half-life of 2~3 ms.