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Investigation of the water sorption properties of Mars-relevant micro- and mesoporous minerals

Jänchen, Jochen and Bish, David L. and Möhlmann, Diedrich T.F. and Stach, Helmut (2006) Investigation of the water sorption properties of Mars-relevant micro- and mesoporous minerals. Icarus: International Journal of Solar System Studies, 180 (2), pp. 353-358. Elsevier. doi: 10.1016/j.icarus.2005.10.010. ISSN 0019-1035.

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Encouraged by recent results of the Mars Odyssey spacecraft mission and the OMEGA team (Mars Express) concerning water in equatorial latitudes between ±45° on Mars and the possible existence of hydrated minerals, we have investigated the water sorption properties of natural zeolites and clay minerals close to martian atmospheric surface conditions as well as the properties of Mg-sulfates and gypsum. To quantify the stability of hydrous minerals on the martian surface and their interaction with the martian atmosphere, the water adsorption and desorption properties of nontronite, montmorillonite, chabazite and clinoptilolite have been investigated using adsorption isotherms at low equilibrium water vapor pressures and temperatures, modeling of the adsorption equilibrium data, thermogravimetry (TG), differential scanning calorimetry (DSC), and proton magic angle spinning nuclear magnetic resonance measurements (<sup>1</sup>H MAS NMR). Mg-sulfate hydrates were also analyzed using TG/DSC methods to compare with clay mineral and zeolites. Our data show that these microporous minerals can remain hydrated under present martian atmospheric conditions and hold up to 2.5–25 wt% of water in their void volumes at a partial water vapor pressure of 0.001 mbar in a temperature range of 333–193 K. Results of the <sup>1</sup>H MAS NMR measurements suggest that parts of the adsorbed water are liquid-like water and that the mobility of the adsorbed water might be of importance for adsorption-water-triggered chemistry and hypothetical exobiological activity on Mars.

Item URL in elib:https://elib.dlr.de/22173/
Document Type:Article
Title:Investigation of the water sorption properties of Mars-relevant micro- and mesoporous minerals
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Jänchen, JochenTechnische Fachhochschule Wildau, GermanyUNSPECIFIEDUNSPECIFIED
Bish, David L.Indiana University, Bloomington, Indiana, USAUNSPECIFIEDUNSPECIFIED
Stach, HelmutZeoSys GmbH, Berlin, GermanyUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 353-358
Keywords:Mars, surface, mineralogy, geochemistry
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - no assignment (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: Pieth, Susanne
Deposited On:02 Feb 2006
Last Modified:14 Jan 2010 20:53

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