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Water vapor weathering of Taurus-Littrow orange soil - A pore-structure analysisA pore-volume analysis was performed on water vapor adsorption data previously obtained on a fresh sample of Taurus-Littrow orange soil, and the analysis was repeated on the same sample after its exposure to moist air for a period of approximately six months. The results indicate that exposure of an outgassed sample to high relative pressures of water vapor can result in the formation of substantial micropore structure, the precise amount being dependent on the sample pretreatment, particularly the outgassing temperature. Micropore formation is explained in terms of water penetration into surface defects. In contrast, long-term exposure to moist air at low relative pressures appears to reverse the process with the elimination of micropores and enlargement of mesopores possibly through surface diffusion of metastable adsorbent material. The results are considered with reference to the storage of lunar samples.
Document ID
19780062895
Document Type
Conference Proceedings
Authors
Cadenhead, D. A. (New York, State University Buffalo, N.Y., United States)
Mikhail, R. S. (Ain Shams University Cairo, Egypt)
Date Acquired
August 9, 2013
Publication Date
January 1, 1975
Subject Category
LUNAR AND PLANETARY EXPLORATION
Meeting Information
Lunar Science Conference(Houston, TX)
Funding Number(s)
CONTRACT_GRANT: NGR-33-183-013
Distribution Limits
Public
Copyright
Other