The H2O and CO2 adsorption properties of phyllosilicate-poor palagonitic dust and smectites under martian environmental conditions

Jänchen, J.; Morris, R. V.; Bish, David L.; Janssen, Mareike; Hellwig, Udo

doi:10.1016/j.icarus.2008.12.006

Cited by 36 publications

(26 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In andisols, allophane and iron (oxy)hydroxides contain substantial amounts of adsorbed H 2 O because of their large specific surface area (SSA) (65) and the presence of surface hydroxyl groups that act as strong adsorption sites through hydrogen bonding (66). Similarly, the abundance of these hydroxylated phases may dominate the SSA of the martian soil and thus the level of atmospheric H 2 (67,68), show indeed that these materials can hold relatively large amounts of adsorbed H 2 O (a few wt %) under martian conditions, even at low relative humidities and with relatively fast exchange kinetics (69).…”

Section: Hydration Of the Amorphous Phase And Specific Surface Area Omentioning

confidence: 95%

Soil Diversity and Hydration as Observed by ChemCam at Gale Crater, Mars

Meslin

Gasnault

Forni

et al. 2013

Science

Self Cite

229

200

View full text Add to dashboard Cite

International audienceThe ChemCam instrument, which provides insight into martian soil chemistry at the submillimeter scale, identified two principal soil types along the Curiosity rover traverse: a fine-grained mafic type and a locally derived, coarse-grained felsic type. The mafic soil component is representative of widespread martian soils and is similar in composition to the martian dust. It possesses a ubiquitous hydrogen signature in ChemCam spectra, corresponding to the hydration of the amorphous phases found in the soil by the CheMin instrument. This hydration likely accounts for an important fraction of the global hydration of the surface seen by previous orbital measurements. ChemCam analyses did not reveal any significant exchange of water vapor between the regolith and the atmosphere. These observations provide constraints on the nature of the amorphous phases and their hydration

show abstract

Section: Hydration Of the Amorphous Phase And Specific Surface Area Omentioning

confidence: 95%

Soil Diversity and Hydration as Observed by ChemCam at Gale Crater, Mars

Meslin

Gasnault

Forni

et al. 2013

Science

Self Cite

229

200

View full text Add to dashboard Cite

show abstract

“…The high montmorillonite content leads to a relatively large surface with 74 m 2 g −1 (BET surface area with N 2 ) (Jänchen et al, 2009b). Studies on montmorillonite using the BET method with water in place of nitrogen have shown a surface enlargement to 217 m 2 g −1 (Jänchen et al, 2009a).…”

Section: Swelling Clay Soilmentioning

confidence: 99%

Supercooled interfacial water in fine-grained soils probed by dielectric spectroscopy

Lorek

Wagner

2013

The Cryosphere

View full text Add to dashboard Cite

Abstract.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 1.1 MHz at Martian-like temperatures down to −70 • C. Two Martian analogue soils have been investigated: a Ca-bentonite (specific surface of 237 m 2 g −1 , up to 9.4 % w/w gravimetric water content) and JSC Mars 1, a volcanic ash (specific surface of 146 m 2 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.

show abstract

“…The CEC of clay mineral is attributed to structural defects, broken bonds and structural hydroxyl transfers (Jänchen et al 2009). Intercalation process increases the total number o exchange sites marginally in bentonite.…”

Section: Characterization Of Bentonite and Organobentonitementioning

confidence: 99%

Use of Bentonite and Organobentonite as Alternatives of Partial Substitution of Cement in Concrete Manufacturing

Lima-Guerra

Mello

Resende

et al. 2014

Int J Concr Struct Mater

View full text Add to dashboard Cite

In order to study the capacities of a new occurrence of Brazilian clay samples as partial replacements of cement, a bentonite sample was selected for utilization in the natural and modified forms for present study. The natural bentonite (BBT) was modified by anchorament of 3-aminopropyltrietoxisilane (BBT APS ) and 3,2-aminoethylaminopropyltrimetoxisilane (BBT AEAPS ) in the surface of component minerals of bentonite sample. The original and organo-bentonite samples were characterized by elemental analysis, scanning electron microscopic and textural analyses. The values of micropore area were varying from 7.2 m 2 g -1 for the BBT to 12.3 m 2 g -1 for the BBT AEAPS . The bentonite samples were characterized by the main variable proportion of bentonite in the natural and intercalated forms (2, 5, 10, 15, 20, 25, 30, and 35 % by weight of cement) in the replacement mode whiles the amount of cementations material. The workability, density of fresh concrete, and absorption of water decreased as the substitution of ordinary Portland cement by perceptual of natural and modified bentonite increased. The results reveal that workability decreased with decrease of the amount of natural bentonite in the concrete, same behavior is observed for bentonite functionalized, varying from 49 to 28 mm. The energetic influence of the interaction of calcium nitrate in the structure of blends was determined through the calorimetric titration procedure.

show abstract

The H2O and CO2 adsorption properties of phyllosilicate-poor palagonitic dust and smectites under martian environmental conditions

Cited by 36 publications

References 22 publications

Soil Diversity and Hydration as Observed by ChemCam at Gale Crater, Mars

Soil Diversity and Hydration as Observed by ChemCam at Gale Crater, Mars

Supercooled interfacial water in fine-grained soils probed by dielectric spectroscopy

Use of Bentonite and Organobentonite as Alternatives of Partial Substitution of Cement in Concrete Manufacturing

Contact Info

Product

Resources

About