Temperature Effects on Triboelectric Charging in the Martian Environment

Details Temperature Effects on Triboelectric Charging in the Martian Environment Temperature Effects on Triboelectric Charging in the Martian Environment

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p53a1493s&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #P53A-1493

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[5470] Planetary Sciences: Solid Surface Planets / Surface Materials And Properties, [5494] Planetary Sciences: Solid Surface Planets / Instruments And Techniques, [6225] Planetary Sciences: Solar System Objects / Mars

Scientific paper

The analysis of soils on Mars requires the transport of materials from the surface of the planet to an instrument aperture. The material, obtained from scoops or drills, may be crushed, and/or sieved to obtain particle sizes suitable for analysis - typically 50-150 microns diameter. Challenges arise in inserting samples into the instrument, sieving and controlling sample cross-contamination because materials in this size range prove to be cohesive under martian conditions [1, 2]. The cohesiveness has been attributed to triboelectric charging, charge that arises from particles rubbing against each other and, particularly, against dissimilar materials such as those used to construct the sieves and the entrance apertures of the instruments. The magnitude of the charging effect depends on the type of materials and a host of other variables including temperature, humidity, roughness, and strain. Experiments by Anderson et al. [1] characterized the effects of using different materials for handling fixtures, and of using vibration to expedite soil transport, on the ability to load soils into analytical instruments in martian conditions. We have modified their experiment to enable measuring the effects of temperature and humidity under similar test conditions. The motivation is to better understand variance of sampling capabilities on Mars with changes in latitude and time of day. [1] Anderson, R. C. et al. Icarus (2009) 204, p545-557 [2] Anderson, R. C. et al. LPSC (2009) abstract 1648 This work is supported by the NASA Mars Instrument Development Program and by the Jet Propulsion Laboratory/CIT

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