Marko Part will defend his doctoral thesis titled "Combined Three-Dimensional Sol-Gel Structures and Atomic Layer Deposited Thin Films" on 30. March 2017 at 16.15 at W. Ostwaldi 1, room B103.
dr Kaupo Kukli, Institute of Physics, University of Tartu
dr Tanel Tätte, Institute of Physics, University of Tartu
prof Aivaras Kareiva Vilnius University, Lithuania
dr Valdek Mikli Tallinn University of Technology
Curing processes enabling transformation of liquid threads into solid fiber material have gained technological importance. The theis are focusing on curing mechanisms for metal alkoxide-derived liquid threads in order to prepare novel structures metal oxide hollow fibres (microtubes). The focus is on YSZ (8% Y2O3 stabilized ZrO2), which exhibits a stable 100% tetragonal phase nanocrystalline structure up to 1000 ˚C. These tubes have excellent mechanical characteristics and can withstand 1000atm pressure inside the tubes. Owing to these and other physical, chemical and mechanical properties, there are many potential applications for these tubes, one example being that the high optical quality of the YSZ tubes could be useful for guiding of light. Ionic conductivity with no electronic component makes these tubes suitable for ionic membrane applications like solid oxide fuel cells (SOFCs) or corresponding gas sensors. We demonstrate a single-tube-based miniature plasma jet device potentially applicable as an ion source for local surface treatment. For the purpose of functionalization, deposition of MgO thin film on nanocrystalline YSZ microtubes was investigated. MgO films were atomic layer deposited from β-diketonate-type precursor 2,2,6,6-tetramethyl-heptanedionato-3,5-magnesium(II).