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Université de Fribourg

Holocene vegetation and fire history of the mountains of Northern Sicily (Italy)

Tinner, Willy ; Vescovi, Elisa ; Leeuwen, Jacqueline F. N. van ; Colombaroli, Daniele ; Henne, Paul D. ; Kaltenrieder, Petra ; Morales-Molino, César ; Beffa, Giorgia ; Gnaegi, Bettina ; Knaap, W. O. van der ; Mantia, Tommaso La ; Pasta, Salvatore

In: Vegetation History and Archaeobotany, 2016, vol. 25, no. 5, p. 499–519

Knowledge about vegetation and fire history of the mountains of Northern Sicily is scanty. We analysed five sites to fill this gap and used terrestrial plant macrofossils to establish robust radiocarbon chronologies. Palynological records from Gorgo Tondo, Gorgo Lungo, Marcato Cixé, Urgo Pietra Giordano and Gorgo Pollicino show that under natural or near natural conditions, deciduous forests...

Université de Fribourg

Three-dimensional pore structure and ion conductivity of porous ceramic diaphragms

Wiedenmann, Daniel ; Keller, Lukas ; Holzer, Lorenz ; Stojadinović, Jelena ; Münch, Beat ; Suarez, Laura ; Fumey, Benjamin ; Hagendorfer, Harald ; Brönnimann, Rolf ; Modregger, Peter ; Gorbar, Michal ; Vogt, Ulrich F. ; Züttel, Andreas ; Mantia, Fabio La ; Wepf, Roger ; Grobéty, Bernard

In: AIChE Journal, 2013, vol. 59, no. 5, p. 1446–1457

The ion conductivity of two series of porous ceramic diaphragms impregnated with caustic potash was investigated by electrochemical impedance spectroscopy. To understand the impact of the pore structure on ion conductivity, the three-dimensional (3-D) pore geometry of the diaphragms was characterized with synchrotron x-ray absorption tomography. Ion migration was calculated based on an extended...

Université de Fribourg

Electrochemical characterization of porous diaphragms in development for gas separation

Stojadinović, J. ; Wiedenmann, Daniel ; Gorbar, M. ; Mantia, F. La ; Suarez, L. ; Herzog, V. Zakaznova ; Vogt, U. F. ; Grobéty, Bernard ; Züttel, Andreas

In: ECS Electrochemistry Letters, 2012, vol. 1, no. 4, p. F25-F28

The alkaline electrolyzer industry is facing the imminent necessity of replacing the asbestos diaphragms with a separator made of a new environmentally friendly material. The influence of a diaphragm's material and porosity on the ionic conductivity was studied for asbestos, zirconium dioxide, wollastonite and olivine diaphragms. Developed electrochemical impedance spectroscopy (EIS) set-up with...

3 results 1