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Title:
Cosmic dust synthesis by accretion and coagulation
Authors:
Praburam, G.; Goree, J.
Affiliation:
AA(University of Iowa, Iowa City, IA, US), AB(University of Iowa, Iowa City, IA, US)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 441, no. 2, p. 830-838 (ApJ Homepage)
Publication Date:
03/1995
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Analogs, Coagulation, Cosmic Dust, Deposition, Space Plasmas, Carbon, Grain Size, Growth, Morphology
DOI:
10.1086/175406
Bibliographic Code:
1995ApJ...441..830P

Abstract

The morphology of grains grown by accretion and coagulation is revealed by a new laboratory method of synthesizing cosmic dust analogs. Submicron carbon particles, grown by accretion of carbon atoms from a gas, have a spherical shape with a cauliflower-like surface and an internal micro-structure of radial columns. This shape is probably common for grains grown by accretion at a temperature well below the melting point. Coagulated grains, consisting of spheres that collided to form irregular strings, were also synthesized. Another shape we produced had a bumpy non- spherical morphology, like an interplanetary particle collected in the terrestrial stratosphere. Besides these isolated grains, large spongy aggregates of nanometer-size particles were also found for various experimental conditions. Grains were synthesized using ions to sputter a solid target, producing an atomic vapor at a low temperature. The ions were provided by a plasma, which also provided electrostatic levitation of the grains during their growth. The temporal development of grain growth was studied by extinguishing the plasma after various intervals.

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