| Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2018) | |
| Thin Films | Wednesday Sessions |
| Session TF-WeP |
| Session: | Thin Films Poster Session II |
| Presenter: | Hea Min Joh, Dong-A University, Republic of Korea |
| Authors: | H.M. Joh, Dong-A University, Republic of Korea T.H. Chung, Dong-A University, Republic of Korea |
| Correspondent: | Click to Email |
Atmospheric pressure helium plasma jetdriven by a low-frequency bipolar pulsed voltage wasemployed for plasma-liquid interactions.Plasma treatment generated the reactive species in gas phase, and these species dissolve into the liquid phase, resulting in the appearance of reactive oxygen and nitrogenspecies (RONS)in liquid. To identify the correlation between the production of RONS in liquids and plasmas, we studiedthe effects of plasma operating parameters on the RONS in gas and liquid phase.The changes of discharge current, optical emission intensities from reactive radicals, gas temperature with the control parameters were measured and compared. The control parameters include applied voltage, pulse withand additive oxygen flowrate.The amountsof O3 and NO2 in gas phase weremeasured by gas detector. For quantitative measurement of RONS radicalsin liquidphase, several chemical methodswere performed on plasma-treated HBSS (Hanks' Balanced Salt Solution).Among these RONS, the OH radicals dissolved in the liquidwere monitored indirectly using the fluorescent properties of hydroxyterephthalic acid (HTA) formed by the reaction of terephthalic acid (TA) with OH radicals.The concentrationsof long-living reactive species(H2O2, NO2-, NO3-, and O3) in liquidweredetected after plasma treatment usingspectrophotometer.It was observed that the various plasmaoperating parameterscould influence the amount of reactive speciesin liquid.