Mathematics – Logic
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...66...56g&link_type=abstract
Icarus (ISSN 0019-1035), vol. 66, April 1986, p. 56-74. NASA-supported research.
Mathematics
Logic
10
Condensation Nuclei, Dust, Mars Atmosphere, Mineralogy, Particle Size Distribution, Atmospheric Composition, Crystallinity, Mars Surface, Mars, Dust, Particles, Nucleation, Mineralogy, Formation, Calorimetry, Ice, Temperature, Condensation, Minerals, Clays, Zeolites, Goethite, Bassanite, Hematite, Crystalline Material, Hydration, Hematite, Frost
Scientific paper
Experiments were performed to determine the factors influencing ice nucleation detected in Viking Lander data from the Mars surface. The study focused on the relationship between mineral properties and condensate formation under Mars conditions. Pulverized particles of the primary phases of basaltic rocks and their alteration products, expandable clay minerals and a nonexpandable clay mineral, and petrologically well-characterized regolith materials ranging from 10-60 microns in size, were studied. The powders were individually or in combinations mixed with water in a flowing CO2 atmosphere while calorimetry data was taken on the ice nucleation threshold. The ice-forming characteristics of the mixes were found to be a function of the crystallographic disregistry, chemical bonding, and active-site properties of the individual minerals. The crystalline materials were better nucleators of condensates than were the cryptocrystalline mineral specimens, while nonexpandable clay materials, particularly zeolite, were the more effective nucleators among the weathering product materials.
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