| DOI: | 10.5194/tc-7-1839-2013
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| Scopus记录号: | 2-s2.0-84890538162
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| 论文题名: | Supercooled interfacial water in fine-grained soils probed by dielectric spectroscopy |
| 作者: | Lorek A; , Wagner N
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| 刊名: | Cryosphere
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| ISSN: | 19940416
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| 出版年: | 2013
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| 卷: | 7, 期:6 | | 起始页码: | 1839
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| 结束页码: | 1855
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| 语种: | 英语
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| 英文关键词: | dielectric property
; fine grained sediment
; Mars
; permittivity
; physicochemical property
; planetary landform
; probe
; spectroscopy
; supercooling
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| 英文摘要: | Water substantially affects nearly all physical, chemical and biological processes on the Earth. Recent Mars observations as well as laboratory investigations suggest that water is a key factor of current physical and chemical processes on the Martian surface, e.g. rheological phenomena. Therefore it is of particular interest to get information about the liquid-like state of water on Martian analogue soils for temperatures below 0 °C. To this end, a parallel plate capacitor has been developed to obtain isothermal dielectric spectra of fine-grained soils in the frequency range from 10 Hz to 1.1MHz at Martian-like temperatures down to -70 °C. Two Martian analogue soils have been investigated: a Ca-bentonite (specific surface of 237m2 g -1, up to 9.4%w/w gravimetric water content) and JSC Mars 1, a volcanic ash (specific surface of 146m2 g-1, up to 7.4%w/w). Three soil-specific relaxation processes are observed in the investigated frequency-temperature range: two weak highfrequency processes (bound or hydrated water as well as ice) and a strong low-frequency process due to counter-ion relaxation and the Maxwell-Wagner effect. To characterize the dielectric relaxation behaviour, a generalized fractional dielectric relaxation model was applied assuming three active relaxation processes with relaxation time of the ith process modelled with an Eyring equation. The real part of effective complex soil permittivity at 350 kHz was used to determine ice and liquid-like water content by means of the Birchak or CRIM equation. There are evidence that bentonite down to -70 °C has a liquid-like water content of 1.17 monolayers and JSC Mars 1 a liquid-like water content of 1.96 monolayers. © Author(s) 2013. CC Attribution 3.0 License. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/74920
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| Appears in Collections: | 影响、适应和脆弱性
气候变化与战略
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作者单位: | German Aerospace Center (DLR), Berlin, Germany; Institute of Material Research and Testing at the Bauhaus-University Weimar, Weimar, Germany
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| Recommended Citation: | |
Lorek A,, Wagner N. Supercooled interfacial water in fine-grained soils probed by dielectric spectroscopy[J]. Cryosphere,2013-01-01,7(6)
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