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Title: Low-temperature dielectric measurements of confined water in porous granites
Authors: Silva, Hugo
Prezas, Pedro
Vinagre, Ana
Graça, Manuel F.
Monteiro, Jorge H.
Tlemçami, Mouhadyne
Moita, Patrícia
Pinho, António
Bezzeghoud, Mourad
Sushil, Mendiratta
Rosa, Rui
Keywords: dielectric measurements
Issue Date: 2014
Citation: Silva et al (2014)Low-temperature dielectric measurements of confined water in porous granites, Geophysical Research Abstracts, vol, 16, EGU2014-12625. EGU General Assembly
Abstract: Three different granitic rocks extracted from Évora (in the south of Portugal) where used to perform dielectric measurements in the frequency range from 100 Hz to 1 MHz and temperatures 100 − 350 K. Thin cylindrical samples were prepared and circular electrodes were established using silver conductive paint. A clear anomaly appears, for T ⇠ 200 − 220 K, in the dielectric measurements of the samples studied. This anomaly occurs in different materials and coincides with a phase transition of supercooled water. Tightly bounded water confined in the pores of the rock do not crystallize at 273 K, but form a metastable liquid down to 200−220 K increasing water polarization. Below this temperature water molecules solidify and polarizability decreases. The rock presenting the most sizeable anomaly has a very low specific surface area, ⇠ 0.09 m2g
Type: lecture
Appears in Collections:GEO - Comunicações - Em Congressos Científicos Internacionais

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