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Title: In situ 3-D mapping of pore structures and hollow grains of interplanetary dust particles with phase contrast X-ray nanotomography

Authors:
 [1];  [2]
  1. XNano Sciences Inc., P.O. Box 12852 Huntsville Alabama 35815 USA
  2. Center for Nanoscale Materials, Argonne National Laboratory, Argonne Illinois 60439 USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1401446
Grant/Contract Number:
AC02-06CH11357
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Meteoritics and Planetary Science
Additional Journal Information:
Journal Volume: 51; Journal Issue: 9; Related Information: CHORUS Timestamp: 2017-10-20 17:04:55; Journal ID: ISSN 1086-9379
Publisher:
Wiley-Blackwell
Country of Publication:
United States
Language:
English

Citation Formats

Hu, Z. W., and Winarski, R. P. In situ 3-D mapping of pore structures and hollow grains of interplanetary dust particles with phase contrast X-ray nanotomography. United States: N. p., 2016. Web. doi:10.1111/maps.12674.
Hu, Z. W., & Winarski, R. P. In situ 3-D mapping of pore structures and hollow grains of interplanetary dust particles with phase contrast X-ray nanotomography. United States. doi:10.1111/maps.12674.
Hu, Z. W., and Winarski, R. P. 2016. "In situ 3-D mapping of pore structures and hollow grains of interplanetary dust particles with phase contrast X-ray nanotomography". United States. doi:10.1111/maps.12674.
@article{osti_1401446,
title = {In situ 3-D mapping of pore structures and hollow grains of interplanetary dust particles with phase contrast X-ray nanotomography},
author = {Hu, Z. W. and Winarski, R. P.},
abstractNote = {},
doi = {10.1111/maps.12674},
journal = {Meteoritics and Planetary Science},
number = 9,
volume = 51,
place = {United States},
year = 2016,
month = 7
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1111/maps.12674

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  • The size distribution and physical properties of interplanetary dust grains as indicated by the analysis of lunar microcraters are reviewed. The problems involved in the determination of the size distribution of lunar microcraters are considered, and a cumulative microcrater size distribution is presented for five microcrater samples which indicates a greater number of small microcraters than previously derived. The ratio of crater depth to diameter is then discussed as a means of studying the physical properties and chemical compositions of the grains, and it is shown that for a sample of 284 craters, the ratio increases with decreasing crater diameter.more » The size distribution and depth/diameter ratio data is interpreted as indicating the presence of two distinct dust populations consisting of a large-grain component with density typical of silicates and a small-grain component with a density typical of iron, with a minor silicate contribution. Spatial measurements and collection experiments are noted to support the interpretation, which also does not suggest the presence of particles of density less than 1 g/cu cm.« less
  • The Khare et al. (1984) optical constants for the organic material designated 'tholin' are presently used to determine an original behavior for tholin grains that is interemediate between that of dielectric and absorbing materials. The ratio of the radiation pressure to the gravitational forces is obtained, together with the temperature distribution, by solving for solar radiation field interactions; temperature is found to be a strong function of grain size, with submicronic grains being hotter than the blackbody. Such observations as CN jets, and the absence of the silicate emission feature beyond 1.5 AU heliocentric distance, can be accounted for bymore » the presence of tholin in the cometary dust. 36 references.« less
  • A study is made of how equilibrium spherical dust structures depend on the volume ionization power, the neutral gas pressure, the number of trapped dust grains, and the ion-to-electron temperature ratio. It is shown that the structures are charged negatively and their charge is determined by the floating potential, which depends on the radius of the structure and on the ion temperature. The structures are charged mainly by absorbing a plasma flux. Conditions are determined under which the polarization fields and charges out-side the structures change sign, indicating the presence of overscreening effects, previously known only for individual dust grains.more » It is shown that overscreening outside the structures results exclusively from the plasma fluxes that are generated by the structure itself and are required to maintain it in equilibrium.« less