Other
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976moon...15..403m&link_type=abstract
The Moon, vol. 15, June-July 1976, p. 403-413.
Other
2
Amorphous Materials, Electrostatic Charge, Gas-Solid Interfaces, Hydrogen Bonds, Lunar Soil, Radiation Damage, Acids, Apollo 11 Flight, Apollo 12 Flight, Bases, Gas Mixtures, Lunar Evolution, Oxygen, Solar Wind, Surface Properties, Water Vapor
Scientific paper
Results are reported for an experimental investigation of gas-interaction effects on different Apollo 11 and Apollo 12 lunar-soil samples containing bonded particles. In the experiments, lunar fines were exposed to pure O2, pure water vapor, HCl, NH3, N2, HCOOH, and CH3NH2, in order to observe whether bonded particles would separate. In addition, repeated gas adsorption/desorption measurements were performed to determine the nature and reactive properties of the particle surfaces, and surface areas were measured for comparison with analogous terrestrial samples to determine whether the surface areas of highly radiation-damaged particles were larger or smaller. It is found that N2 is apparently ineffective in separating bonded particles and that the ratio of Apollo 11 to Apollo 12 bonded particles separated by a particular gas exposure ranges from 2.5 to 3.0. Possible reasons for differences in material surface properties at the two Apollo sites are considered, and it is concluded that material from a certain depth at some other site was transported to the Apollo 12 site and mixed with the original material in recent years (considerably less than 2000 years ago).
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