Physics – Condensed Matter – Materials Science
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992eocm.rept..325f&link_type=abstract
In ESA, Environment Observation and Climate Modelling Through International Space Projects. Columbus Eight (COSY-8): Utilisation
Physics
Condensed Matter
Materials Science
Agglomeration, Astrophysics, Cosmic Dust, Interstellar Matter, Microgravity, Nucleation, Partial Pressure, Temperature Effects, Condensing, Materials Science, Parabolic Flight, Physical Chemistry, Solid State Physics, Vapor Phases
Scientific paper
A short description of the program Stardust whose goal is to study the formation and properties of high temperature particles and gases, including silicate and carbonaceous materials, that are of interest in astrophysics and planetary science, is given. The international program was carried out in microgravity conditions in parabolic flight. A description of the laboratory equipment, conceived to perform experimental tests in reduced gravity conditions, and which is based on the gas evaporation technique, is given. The gas evaporation technique utilizes one or more heated crucible to vaporize solids materials (SiO, Mg) in a low pressure of inert or reactive gas inside of a vacuum bell jar. The vapor pressures of the materials are controlled by the temperature of the crucibles. The temperature and pressure of inert gas are also controlled. By varying the vapor pressure relative to the gas temperature and pressure, the conditions for substantial grain condensation can be controlled and grain formation measured using light scattering techniques. Thus the partial pressure for grain condensation, can be measured as a function of temperature. The gas evaporation technique has the advantage that complex chemical systems can be studied by using multiple crucibles each containing solid source material. Experimental results and future trends are addressed.
Bussoletti Ezio
Carotenuto L.
Colangeli Luigi
Dellaversana P.
Ferguson Frank
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