INTRODUCTIONNon‐thermal atmospheric pressure plasma, referring to an ionized gas in which the free electrons are not at a thermal equilibrium with the heavy gas particles, can be generated using a wide array of different plasma devices and types of discharge. These include atmospheric pressure plasma jets, corona discharge, di‐electric barrier discharge (DBD) or microwave (MW) driven plasmas, with the resulting plasma containing charged particles (electrons, positive and negative ions), radicals, excited molecules, and photons.The exposure of water to plasma glow or afterglow introduces chemical changes in the liquid, notably a reduction in pH and an introduction of reactive oxygen (ROS) and/or reactive nitrogen species (RNS), with hydrogen peroxide, nitrite and nitrate being among the most commonly detected species due to their relative stability. Plasma treated water derives antimicrobial activity from the synergistic effects of the plasma generated reactive species and low pH and has demonstrated potential in decontamination of surfaces or food products as well as having potential for medical applications. While the reduction in pH is essential for antimicrobial effects, it has been demonstrated that neither HNO3 nor HNO2 at comparable pH level achieve the same effect. It has been proposed that unstable reactive species such as peroxynitrite
Plasma Processes and Polymers – Wiley
Published: Jan 1, 2018
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