Journal article
Cosmic dust synthesis by accretion and coagulation
The Astrophysical journal, Vol.441(2), pp.830-838
03/1995
DOI: 10.1086/175406
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.
Details
- Title: Subtitle
- Cosmic dust synthesis by accretion and coagulation
- Creators
- G PraburamJ Goree
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.441(2), pp.830-838
- DOI
- 10.1086/175406
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Publisher
- University of Chicago Press
- Language
- English
- Date published
- 03/1995
- Academic Unit
- Physics and Astronomy; Mechanical Engineering
- Record Identifier
- 9984199769002771
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