Low-temperature dielectric measurements of confined water in porous granites
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10174/12580 https://doi.org/Silva H.G., M. Tlemçani, J.H. Monteiro, M.P. Graça, P. Moita, A. Pinho, M. Bezzeghoud, S.K. Mendiratta, and R. Namorado Rosa, 2014. Low-temperature dielectric measurements of confined water in porous granites, Geophysics, 79, 3; D187–D195, http://dx.doi.org/10.1190/GEO2013-0399.1 https://doi.org/10.1190/geo2013-0399.1 |
Resumo: | The dielectric behavior of rocks affected by the known phase transition of supercooled water is the main problem we analyzed. Three different granitic rocks were 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 change in the dielectric measurements appears at T∼220K for one of the samples. This coincides with the known 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 maintaining water polarization. Below this temperature, water molecules solidify and polarizability decreases. The rock presenting the most sizable change has a very low specific surface area of ∼0.09m2g−1, has connected porosity of ∼1.10%, and has the smallest degree of alteration. In addition, geochemical analyzes reveal a low percentage of hydration water in its structure confirming the role of pore water in this change. A comparison between water-saturated, oven-dried, and vacuum-dried samples was done. Finally, a logarithmic dependency of the critical temperature for the supercooled water phase transition with the measuring frequency was found. |
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Low-temperature dielectric measurements of confined water in porous granitesRock physicsPorosityWater tableElectromagneticsThe dielectric behavior of rocks affected by the known phase transition of supercooled water is the main problem we analyzed. Three different granitic rocks were 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 change in the dielectric measurements appears at T∼220K for one of the samples. This coincides with the known 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 maintaining water polarization. Below this temperature, water molecules solidify and polarizability decreases. The rock presenting the most sizable change has a very low specific surface area of ∼0.09m2g−1, has connected porosity of ∼1.10%, and has the smallest degree of alteration. In addition, geochemical analyzes reveal a low percentage of hydration water in its structure confirming the role of pore water in this change. A comparison between water-saturated, oven-dried, and vacuum-dried samples was done. Finally, a logarithmic dependency of the critical temperature for the supercooled water phase transition with the measuring frequency was found.Society of Exploration Geophysicists2015-02-18T10:32:38Z2015-02-182014-05-09T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10174/12580https://doi.org/Silva H.G., M. Tlemçani, J.H. Monteiro, M.P. Graça, P. Moita, A. Pinho, M. Bezzeghoud, S.K. Mendiratta, and R. Namorado Rosa, 2014. Low-temperature dielectric measurements of confined water in porous granites, Geophysics, 79, 3; D187–D195, http://dx.doi.org/10.1190/GEO2013-0399.1http://hdl.handle.net/10174/12580https://doi.org/10.1190/geo2013-0399.1eng0016-803379GeophysicsDFIShgsilva@uevora.pttlem@uevora.ptndndpmoita@uevora.ptapinho@uevora.ptmourad@uevora.ptndrrosa@uevora.pt393Silva, H.G.Tlemçani, M.Monteiro, J.H.Graça, M.P.Moita, P.Pinho, A.Bezzeghoud, M.Mendiratta, S.K.Namorado Rosa, Ruiinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-03T18:57:38Zoai:dspace.uevora.pt:10174/12580Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:06:18.113691Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Low-temperature dielectric measurements of confined water in porous granites |
title |
Low-temperature dielectric measurements of confined water in porous granites |
spellingShingle |
Low-temperature dielectric measurements of confined water in porous granites Silva, H.G. Rock physics Porosity Water table Electromagnetics |
title_short |
Low-temperature dielectric measurements of confined water in porous granites |
title_full |
Low-temperature dielectric measurements of confined water in porous granites |
title_fullStr |
Low-temperature dielectric measurements of confined water in porous granites |
title_full_unstemmed |
Low-temperature dielectric measurements of confined water in porous granites |
title_sort |
Low-temperature dielectric measurements of confined water in porous granites |
author |
Silva, H.G. |
author_facet |
Silva, H.G. Tlemçani, M. Monteiro, J.H. Graça, M.P. Moita, P. Pinho, A. Bezzeghoud, M. Mendiratta, S.K. Namorado Rosa, Rui |
author_role |
author |
author2 |
Tlemçani, M. Monteiro, J.H. Graça, M.P. Moita, P. Pinho, A. Bezzeghoud, M. Mendiratta, S.K. Namorado Rosa, Rui |
author2_role |
author author author author author author author author |
dc.contributor.author.fl_str_mv |
Silva, H.G. Tlemçani, M. Monteiro, J.H. Graça, M.P. Moita, P. Pinho, A. Bezzeghoud, M. Mendiratta, S.K. Namorado Rosa, Rui |
dc.subject.por.fl_str_mv |
Rock physics Porosity Water table Electromagnetics |
topic |
Rock physics Porosity Water table Electromagnetics |
description |
The dielectric behavior of rocks affected by the known phase transition of supercooled water is the main problem we analyzed. Three different granitic rocks were 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 change in the dielectric measurements appears at T∼220K for one of the samples. This coincides with the known 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 maintaining water polarization. Below this temperature, water molecules solidify and polarizability decreases. The rock presenting the most sizable change has a very low specific surface area of ∼0.09m2g−1, has connected porosity of ∼1.10%, and has the smallest degree of alteration. In addition, geochemical analyzes reveal a low percentage of hydration water in its structure confirming the role of pore water in this change. A comparison between water-saturated, oven-dried, and vacuum-dried samples was done. Finally, a logarithmic dependency of the critical temperature for the supercooled water phase transition with the measuring frequency was found. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-05-09T00:00:00Z 2015-02-18T10:32:38Z 2015-02-18 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10174/12580 https://doi.org/Silva H.G., M. Tlemçani, J.H. Monteiro, M.P. Graça, P. Moita, A. Pinho, M. Bezzeghoud, S.K. Mendiratta, and R. Namorado Rosa, 2014. Low-temperature dielectric measurements of confined water in porous granites, Geophysics, 79, 3; D187–D195, http://dx.doi.org/10.1190/GEO2013-0399.1 http://hdl.handle.net/10174/12580 https://doi.org/10.1190/geo2013-0399.1 |
url |
http://hdl.handle.net/10174/12580 https://doi.org/Silva H.G., M. Tlemçani, J.H. Monteiro, M.P. Graça, P. Moita, A. Pinho, M. Bezzeghoud, S.K. Mendiratta, and R. Namorado Rosa, 2014. Low-temperature dielectric measurements of confined water in porous granites, Geophysics, 79, 3; D187–D195, http://dx.doi.org/10.1190/GEO2013-0399.1 https://doi.org/10.1190/geo2013-0399.1 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0016-8033 79 Geophysics DFIS hgsilva@uevora.pt tlem@uevora.pt nd nd pmoita@uevora.pt apinho@uevora.pt mourad@uevora.pt nd rrosa@uevora.pt 393 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Society of Exploration Geophysicists |
publisher.none.fl_str_mv |
Society of Exploration Geophysicists |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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