Abstract
In this paper we study the cold atmospheric pressure plasma jet, called kinpen, operating in Ar with different admixture fractions up to 1% pure , and + . Moreover, the device is operating with a gas curtain of dry air. The absolute net production rates of the biologically active ozone () and nitrogen dioxide () species are measured in the far effluent by quantum cascade laser absorption spectroscopy in the mid-infrared. Additionally, a zero-dimensional semi-empirical reaction kinetics model is used to calculate the net production rates of these reactive molecules, which are compared to the experimental data. The latter model is applied throughout the entire plasma jet, starting already within the device itself. Very good qualitative and even quantitative agreement between the calculated and measured data is demonstrated. The numerical model thus yields very useful information about the chemical pathways of both the and the generation. It is shown that the production of these species can be manipulated by up to one order of magnitude by varying the amount of admixture or the admixture type, since this affects the electron kinetics significantly at these low concentration levels.
Highlights
The cold atmospheric pressure radio frequency (RF) plasma jet is considered to be a promising technology in a wide range of biological and medical applications [1]
In the context of the comparison of these net production rates in the measurement cell, it is important to mention that the model was previously only used for simulating the plasma jet and its effluent for a typical timescale of milliseconds
As the residence time of the plasma jet effluent within the measurement cell during sampling by the Quantum cascade laser absorption spectroscopy (QCLAS) is significantly longer, we changed the end time for our simulations to 6 s, in order to allow for a correct comparison with the measured net production rates
Summary
The cold atmospheric pressure radio frequency (RF) plasma jet is considered to be a promising technology in a wide range of biological and medical applications [1]. It is important to know how the chemical composition of the gas phase changes when it comes into contact with a solid/liquid biological sample and passes through this interphase [14,15,16,17]. It needs to be understood how the reactive species, i.e. reactive oxygen and nitrogen species (ROS and RNS), affect the biochemical processes and change the structure of biomolecules [19,20,21]. This study reports on the production of nitrogen dioxide(NO2) and ozone(O3) which are both identified as important RONS in plasma medicine applications
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