Other
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.553w&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Other
Scientific paper
The PCS flight apparatus was accommodated in the ISS EXPRESS Rack 2 and was remotely operated from the NASA Glenn Research Center's (GRC) Telescience Support Center in Cleveland, Ohio and at a remote site at Harvard University in Cambridge, Massachusetts. This sophisticated light scattering instrument is capable of imaging, and dynamic and static (D&S) light scattering from 11 to 169 degrees, Bragg scattering over the range from 10 to 60 degrees, and laser light scattering at low angles from 0.3 to 6.0 degrees. PCS was launched on 4/19/2001 on Space Shuttle STS-100. The experiment was activated on May 31, 2001. As of February 2002, PCS has accomplished around 1800 hours of onboard operation, during which, binary colloidal crystal alloys, crystal nucleation and growth and the resultant structures have been studied. The long duration microgravity environment in the ISS facilitated extended studies on the growth and coarsening characteristics of crystals. The de-mixing of the colloid- polymer critical-point sample was also studied as it phase-separates into two phases, one that resembles a gas and one that resembles a liquid. This behavior cannot be observed in the sample on Earth because sedimentation would cause the colloids to fall to the bottom of the cell faster than the de-mixing process could occur. Similarly, the study of aging of another colloid-polymer sample, the colloid-polymer gel, also provided valuable information. The investigations on the extremely slow, low concentration fractal gels gave the initial gelation rate over several days. Several exciting and microgravity unique aspects of these results will be discussed.
Bailey A.
Bowen Jason
Christianson R.
Cipelletti
Doherty Marcus
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