(423c) Novel Spatially and Temporally Confined Microplasmas for Advanced Oxidation

Authors: 
Pommerenck, J., Oregon State University
Pommerenck, J., Oregon State University
Yokochi, A. F. T., Oregon State University
Kreider, P., Oregon State University
Alanazi, Y., Oregon State University
Lum, J., Oregon State University

A continued discussion of a study on dc discharges in aqueous environments is offered. The focus remains on non-thermal plasma confined to micrometer spatial scales on sub-nanosecond to nanosecond temporal scales. Specific target compounds are used in order to demonstrate the previously observed efficacy of plasma technology. Each regime such as pulsed, spark, corona, glow, and partial discharges of these charge densities, in terms of their respective mediums, are explored. The time scale is used to control the development of microplasma discharge events within specific current density regimes as an efficiency promoter. Nanostructured and microstructured emitter electrodes are still employed under the high electric fields at the micrometer scale. Discharges in liquid at 365V on the nanosecond scale with nanoemitter electrodes is observed as reported. Significant oxidative degradation of chemical colorimetrics is observed for ultra-short residence times. Several reactor configurations have been explored including analogs to macroscopic systems. The reaction engineering kinetics of these confined microplasmas will be discussed for these massively paralleled systems. Improvements in discharge efficiency are related to reductions in mass transfer in microfalling films and continuous microdrip configurations. Optical imaging of the interaction of the discharge’s electric field with the fluid will be offered if time permits as an exploratory tool as well as spectral grating of frequency for unobserved metastables based on photoionization intensity and energy.