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|Title: ||Low-temperature dielectric measurements of confined water in porous granites|
|Authors: ||Silva, Hugo|
Graça, Manuel F.
Monteiro, Jorge H.
|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|
|Appears in Collections:||GEO - Comunicações - Em Congressos Científicos Internacionais|
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