Abstract
The interaction with aqueous solutions of an air plasma provided by a D.C. point-to-plane corona device at atmospheric pressure has been investigated with focusing on the chemical properties of the neutral species after separation from the ion flux. Evidence is given of acid effects induced on the target solution. The increase in acidity due to the treatment by the chargeless activated species — mainly singlet oxygen in air and oxygen plasmas — is measured and related to the quantity of electricity involved in the discharge. In addition, acid-base indicators trapped in a gel are used to develop the acid effect and allow to measure the treated area, in order to get an analytical tool to predict the corona treatment. This area depends on the electric parameters voltage and current intensity, on the distance from the point electrode, on the electrode gap and on the initial acidity of the target.
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