Fredrik Bajers Vej 5
Postboks 159 9100 Aalborg
Telefon: 9940 9940
Læs op (få teksten på websitet læst op)
Georgiana-Laura Paraschiv, Department of Chemistry and Bioscience will defend her thesis on: "Structure and Physical Properties of Oxynitride Glasses"
03.11.2017 kl. 13.00 - 03.11.2017 kl. 16.00
"Structure and Physical Properties of Oxynitride Glasses"
Glass is one of the most versatile materials available in the modern world. The advent of smart and wearable electronics, electric-powered technology and improved optics is demanding greater performances from glassy materials, e.g. enhanced portability and damage resistance. Thus tougher, stronger and durable glasses are required. This is can be achieved through designing new glasses with improved properties.
The approach explored within this PhD study entails the incorporation of nitrogen within conventional oxide glass to obtain novel oxynitride glasses. This is achieved by synthesizing different phosphorus-based oxynitride glass systems with varied compositions and develop novel structure - atomic packing - dynamic properties correlations for oxynitride glasses.
The effects of incorporated nitrogen over the glass properties were probed by the means of differential scanning calorimetry (DSC), various spectroscopic methods and indentation analysis. The evolution of hardness with nitrogen was investigated by the means of topological considerations.
The nitrogen-for-oxygen substitution is generating structural changes within the oxynitride glass network, thus causing significant modifications of the glass properties. Some properties exhibited a linear relationship with nitrogen content (e.g. density, glass transition temperature, harness), while others (e.g. liquid fragility) have shown a more complex compositional dependence. Addition of a secondary network former oxide in phosphate glasses generates more complex structural features. The presence of nitrogen alters the glass structure in terms of short-range order, but also intermediary-range order.
Associate Professor Sharafat Ali, Dept. of Built Environment and Energy Technology, Sweden
Department of Chemistry and Bioscience, Section Biology and Environmental Science
Fredrik Bajers Vej 7H, 9220 Aalborg Ø, room number: To be announced
29.08.2018 kl. 17.00 - 31.08.2018 kl. 16.00
The 17th Nordic Filtration Symposium will be organized by The Nordic Filtration Society and Aalborg University, Denmark. The focus of the symposium is separation processes for resource recycling but other topic regarding filtration and separation are welcome. There will be oral sessions and poster exhibitions.