Detalhes bibliográficos
| Resumo: | 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 |
|---|
| Autores principais: | Silva, Hugo |
|---|
| Outros Autores: | Prezas, Pedro; Vinagre, Ana; Graça, Manuel F.; Monteiro, Jorge H.; Tlemçami, Mouhadyne; Moita, Patrícia; Pinho, António; Bezzeghoud, Mourad; Sushil, Mendiratta; Rosa, Rui |
|---|
| Assunto: | dielectric measurements granites |
|---|
| Ano: | 2015 |
|---|
| País: | Portugal |
|---|
| Tipo de documento: | palestra |
|---|
| Tipo de acesso: | acesso aberto |
|---|
| Instituição associada: | Universidade de Évora |
|---|
| Idioma: | português |
|---|
| Origem: | Repositório Científico da Universidade de Évora |
|---|