BaTiO&lt;sub&gt;3&lt;/sub&gt;-based thermistor hollow fibers prepared using a phase inversion spinning process for energy efficient gas sorption

Bell, Jon G.; Cavasin, N.; Knorpp, A.; Graule, T.; Stuer, M.

doi:10.1016/j.jeurceramsoc.2021.10.049

BaTiO₃-based thermistor hollow fibers prepared using a phase inversion spinning process for energy efficient gas sorption

Bell JG, Cavasin N, Knorpp A, Graule T & Stuer M

Citation

Bell, J. G., Cavasin, N., Knorpp, A., Graule, T., & Stuer, M. (2022). BaTiO₃-based thermistor hollow fibers prepared using a phase inversion spinning process for energy efficient gas sorption. Journal of the European Ceramic Society, 42(3), 981-992. https://doi.org/10.1016/j.jeurceramsoc.2021.10.049

Persistent URL https://www.dora.lib4ri.ch/empa/islandora/object/empa:27266

Positive temperature coefficient of resistivity (PTCR) hollow fibers that exhibit self-regulating heating characteristics have potential applications in temperature-swing adsorption systems (TSA), such as CO₂ recovery and drying of compressed air. La-doped BaTiO₃ hollow fibers displaying a PTCR effect were produced by phase inverting a casting solution consisting of N-methly-2-Pyrrolidone, polymethyl methacrylate, polyvinylpyrrolidone, BaTiO₃, TiO₂, and La₂O₃ through a spinneret into a coagulating waterbath. This was followed by polymer debinding, high temperature sintering between 1350-1400 °C and annealing in air at 1175 °C to produce hollow fibers of the composition Ba_0.9975La_0.0025TiO₃. Hydrothermal synthesis was implemented to deposit an adsorbent porous zeolite X layer within the hollow fiber lumen, which was confirmed by electron dispersive X-ray spectroscopy and CO₂ adsorption at 0 °C. Hence, these materials can be applied to energy efficient TSA gas separation processes. The results are discussed in terms of hollow fiber microstructure, adsorption characteristics and electrical properties.