PhD Thesis Defence Presentations - Dimitrios Passaras

Presentation Title (Τίτλος Παρουσίασης): Simulation and experimental study of atmospheric pressure plasma jets depositing thin films for controlled release of chemical substances
Presentation Type (Τύπος Παρουσίασης): PhD Thesis Defence Presentations
Speakers Full Name (Ονοματεπώνυμο): Dimitrios Passaras
Speakers Affiliation (Προέλευση Ομιλητή): University of Patras, Department of Chemical Engineering
Seminar Room (Αίθουσα): "A. C. Payatakes" Library
Event Date: Fri, Aug 04 2023, Time: 11:00 - 13:00
Abstract (Περίληψη)

The detailed simulation of film deposition with cold atmospheric pressure plasma (CAPP) jets is an extremely difficult task with a huge computational cost. To deal with this complexity and cost, a hybrid computational framework is developed which allows fast calculations with detailed reactions sets. The effect of different turbulence flow models [standard k-ε, realizable k-ε, and Large Eddy Simulation (LES)] on the density of plasma generated species along the axial direction of the jet is investigated. The use of the simple k-ε turbulence models constitutes a good compromise between accuracy and computational cost. Experimental measurements of the gas temperature and the plasma absorbed power coupled with the hybrid computational framework and additional turbulence flow simulations are utilized to calculate deposition rates of SiOx on a Si substrate by the lab Ar/Hexamethyldisiloxane (HMDSO) plasma jet reactor. A detailed reaction set including 845 reactions and 87 species is utilized by the computational framework.  The sticking coefficient of the depositing radical (fragment of the precursor) on the Si surface is not known and is determined by means of fitting the calculated deposition rates to the experimental ones for different distances of the substrate surface from the plasma jet reactor. Finally, Si porous matrices with SiOx coatings deposited by a CAPP jet are promising candidates in devices for controlled drug release.

Speakers Short CV (Σύντομο Βιογραφικό Ομιλητή)

Dimitrios Passaras graduated from the Physics Department of the National and Kapodistrian University of Athens in 2010. In 2012 he obtained his Master's Degree in "Electronics and Telecommunications" and in 2016 he obtained his second Master's Degree in "Integrated Circuit Design" from the same University. In 2016 he began his PhD studies in the Department of Chemical Engineering of the University of Patras in collaboration with NCSR "Demokritos". His PhD Thesis was supported by an IKY (Greek State Scholarship Foundation) scholarship.


Published Articles

  • “Inactivation of pectinmethylesterase in fresh orange juice by cold atmospheric plasma technology: A kinetic study”, V. Andreou, M. Giannoglou, M.Z. Xanthou, D. Passaras, G. Kokkoris, E. Gogolides, G. Katsaros, Innovative Food Sci. Emerg. Technol. 86, 103361 (2023)

  • “Cold-atmospheric-plasma activated-ice as a cooling medium with antimicrobial properties: Case study on fish fillet preservation”, S. Chanioti, M. Giannoglou, P. Stergiou, D. Passaras, P. Dimitrakellis, G. Kokkoris, E. Gogolides, G. Katsaros, Food Research International 167, 12639 (2023)

  • “Plasma-activated water for disinfection and quality retention of sea bream fillets: Kinetic evaluation and process optimization”, S. Chanioti, M. Giannoglou, P. Stergiou, D. Passaras, P. Dimitrakellis, G. Kokkoris, E. Gogolides, G. Katsaros, Innovative Food Sci. Emerg. Technol. 85, 103334 (2023)

  • “A hybrid computational framework for the simulation of atmospheric pressure plasma jets: The importance of the gas flow model”, D. Passaras, E. Amanatides, G. Kokkoris, Plasma Sources Sci. Technol. 30, 125018 (2021)

  • “Predicting the flow of cold plasma jets in kINPen: A critical evaluation of turbulent models”, D. Passaras, E. Amanatides, G. Kokkoris, J. Phys. D: Appl. Phys. 53, 265202 (2020)


Conference Contributions

  • «Προσομοίωση απόθεσης βιοδιασπώμενων υμενίων με αντιδραστήρα πλάσματος τύπου τζετ», Δ. Πασσαράς, Ε. Φαρσάρη, Γ. Κόκκορης, Ε. Αμανατίδης, 13ο Πανελλήνιο Συνέδριο Χημικής Μηχανικής, Πάτρα, 2-4 Ιουνίου, 2022 (poster)

  • “Fast computations in atmospheric pressure plasma jets”, D. Passaras, E. Amanatides, G. Kokkoris, 73rd Annual Gaseous Electronics Conference (GEC 20 - Virtual), October 5 - 9, 2020 (poster, 2nd prize award)

  • “A code for global modeling of atmospheric pressure plasma jets”, D. Passaras, K. Kontosis, G. Kokkoris, iPlasmaNano-VII, Athens, Greece, October 16-20, 2016 (poster)