JAXA Repository / AIREX 未来へ続く、宙(そら)への英知

このアイテムに関連するファイルはありません。

タイトルProperties of simulated comet mantle
著者(英)Laue, E.; Stephens, J.; Saunders, S.; Sutton, S.; Fanale, F. P.; Banerdt, B.
著者所属(英)Jet Propulsion Lab., California Inst. of Tech.
発行日1984-04-01
言語eng
内容記述The properties of freeze-dried dilute dispersions of dust in water ice are of considerable interest in studies of comet nucleus mantles. The formation of a rind residue produced by the sublimation of water ice containing various amounts of fine clay particles may be an important process. A simulation of the development of the dry dust rind on the surface of comets is presented. This rind is the result of preferential ice sublimation. The development and disruption of this rind and its subsequent levitation by water vapor flow is studied. The most interesting rind simulant is produced by dispersing 0.1 micron particles of montmorillonite in water in concentrations of 10%, 1%, and 0.1%. These dispersions are then sprayed into liquid nitrogen in the form of 100 micron droplets. The frozen droplets are then freeze-dried in a vacuum which prevents the ice temperature from rising above -30 C. Sublimation of the nitrogen and the water produced dry rinds. The most striking result was the development of large cohesive matrices of individual clay particles, and in some cases a continuous cohesive crust. Scanning electron microscope (SEM) observations reveal that the material formed by freeze-drying the 0.1% dispersion does not retain the original spherical shape of the sprayed 100 micron droplets; instead it consists of a continuous filamentary network, as shown in the SEM stereo micrographs.
NASA分類LUNAR AND PLANETARY EXPLORATION
レポートNO84N23452
権利No Copyright
URIhttps://repository.exst.jaxa.jp/dspace/handle/a-is/527222


このリポジトリに保管されているアイテムは、他に指定されている場合を除き、著作権により保護されています。