Hannover 2020 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 12: Atmospheric-pressure plasma and applications 3

P 12.6: Vortrag

Mittwoch, 11. März 2020, 12:30–12:45, b305

Plasma Medical Investigations for Disinfection of Different Surfaces and Their Modifications Caused by Cold Atmospheric Plasma Treatment — •Sandra Moritz¹, Alisa Schmidt¹, Joachim Sann², and Markus Thoma¹ — ¹1. Physikalisches Institut, Justus-Liebig University, Gießen, Germany — ²Physikalische Chemie, Justus-Liebig University, Gießen, Germany

Inactivation of microorganism on sensitive surfaces by cold atmospheric plasma is one major application in the field of plasma medicine, because it provides a simple way to sterilize heat-sensitive materials. Therfore, one has to know whether plasma treatment affects treated surfaces. In this contribution, the effect of cold atmospheric surface micro-discharge (SMD) plasma on plasma-treated surfaces was investigated. Hence, different material samples (stainless steel, different polymers and glass) were plasma-treated for 16 hours using an SMD plasma device. Furthermore, the device was used to investigate the behaviour of Bacillus atrophaeus inoculated on the material samples at different treatment times. Afterwards, the material probes were analysed using surface analysis methods such as laser microscopy, contact angle measurements and X-ray photoelectron spectroscopy. The results show in case of the treated bacteria that a log reduction in bacterial number between 3.0 and 6.0 can be achieved within only 15 min of plasma treatment. In accordance to this results, surface analysis revealed, that there were three different types of reactions the probed materials showed to plasma treatment, ranging from no changes to shifts of the materials' free surface energies and oxidation.