Atomic oxygen dynamics in an air dielectric barrier discharge: a combined diagnostic and modeling approach. (5th June 2015)

• Record Type: Journal Article
• Authors: Baldus, Sabrina; Schröder, Daniel; Bibinov, Nikita; Schulz-von der Gathen, Volker; Awakowicz, Peter
• Is Part Of: Journal of physics. Volume 48:Number 27(2015)
• Page Start: 24
• Page End: 29
• Publication Date: 2015-06-05
• Subjects: Physics -- Periodicals; 530
• DOI: 10.1088/0022-3727/48/27/275203
• Languages: English
• ISSNs: 0022-3727

Abstract

<abstract> <title>Abstract</title> <p>Cold atmospheric pressure plasmas are a promising alternative therapy for treatment of chronic wounds, as they have already shown in clinical trials. In this study an air dielectric barrier discharge (DBD) developed for therapeutic use in dermatology is characterized with respect to the plasma produced reactive oxygen species, namely atomic oxygen and ozone, which are known to be of great importance to wound healing. To understand the plasma chemistry of the applied DBD, xenon-calibrated two-photon laser-induced fluorescence spectroscopy and optical absorption spectroscopy are applied. The measured spatial distributions are shown and compared to each other. A model of the afterglow chemistry based on optical emission spectroscopy is developed to cross-check the measurement results and obtain insight into the dynamics of the considered reactive oxygen species. The atomic oxygen density is found to be located mostly between the electrodes with a maximum density of <inline-formula><tex-math><?CDATA ${{n}_{\text{O}}}=6\times {{10}^{16}}$ ?></tex-math><?MML <mml:math><mml:mstyle displaystyle='true'><mml:mstyle displaystyle='false'><mml:msub><mml:mi>n</mml:mi><mml:mrow><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow></mml:mrow></mml:msub></mml:mstyle><mml:mo>=</mml:mo><mml:mn>6</mml:mn><mml:mo>×</mml:mo><mml:mstyle displaystyle='false'><mml:msup><mml:mn>10</mml:mn><mml:mrow><mml:mn>16</mml:mn></mml:mrow></mml:msup></mml:mstyle></mml:mstyle></mml:math> ?><inline-graphic xlink:href="ark:/27927/pgj14jg8gnz" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></inline-formula> cm<inline-formula><tex-math><?CDATA $^{-3}$ ?></tex-math><?MML <mml:math><mml:mstyle displaystyle='true'><mml:mstyle displaystyle='false'><mml:msup><mml:mi></mml:mi><mml:mrow><mml:mo>−</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mstyle></mml:mstyle></mml:math> ?><inline-graphic xlink:href="ark:/27927/pgj14jg8swg" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></inline-formula>. Time resolved measurements reveal a constant atomic oxygen density between two high voltage pulses. The ozone is measured up to 3 mm outside the active plasma volume, reaching a maximum value of <inline-formula><tex-math><?CDATA ${{n}_{{{\text{O}}_{3}}}}=3\times {{10}^{16}}$ ?></tex-math><?MML <mml:math><mml:mstyle displaystyle='true'><mml:mstyle displaystyle='false'><mml:msub><mml:mi>n</mml:mi><mml:mrow><mml:mstyle displaystyle='false'><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mstyle></mml:mrow></mml:msub></mml:mstyle><mml:mo>=</mml:mo><mml:mn>3</mml:mn><mml:mo>×</mml:mo><mml:mstyle displaystyle='false'><mml:msup><mml:mn>10</mml:mn><mml:mrow><mml:mn>16</mml:mn></mml:mrow></mml:msup></mml:mstyle></mml:mstyle></mml:math> ?><inline-graphic xlink:href="ark:/27927/pgj14jg8f0z" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></inline-formula> cm<inline-formula><tex-math><?CDATA $^{-3}$ ?></tex-math><?MML <mml:math><mml:mstyle displaystyle='true'><mml:mstyle displaystyle='false'><mml:msup><mml:mi></mml:mi><mml:mrow><mml:mo>−</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mstyle></mml:mstyle></mml:math> ?><inline-graphic xlink:href="ark:/27927/pgj14jg6qr8" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></inline-formula> between the electrodes.</p> </abstract>