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  • Other Sources  (2)
  • 1995-1999  (2)
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  • 1
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    Microgravity Experiments Being Developed for Microscopic Study of Colloidal Spheres (1999)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: Microscopic spheres suspended in liquid become highly ordered under the proper conditions. Such collections of particles, called colloidal suspensions or colloids, are the subject of a series of ongoing microgravity experiments at the NASA Lewis Research Center. By studying the way these colloidal suspensions order themselves, scientists can better understand how atoms of a liquid become ordered to form a solid. In addition, highly ordered colloids have special properties that may make them useful in future hightech applications. Work is underway at Lewis to develop an optical microscope to view these colloidal suspensions sphere by sphere in microgravity.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: Research and Technology 1998; NASA/TM-1999-208815
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    The Dynamics of Disorder-Order Transition in Hard Sphere Colloidal Dispersions (1998)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: The Physics of Hard Spheres Experiment (PHaSE) seeks a complete understanding of the entropically driven disorder-order transition in hard sphere colloidal dispersions. The light scattering instrument designed for flight collects Bragg and low angle light scattering in the forward direction via a CCD camera and performs conventional static and dynamic light scattering at 10-160 deg. through fiber optic cables. Here we report on the kinetics of nucleation and growth extracted from time-resolved Bragg images and measurements of the elastic modulus of crystalline phases obtained by monitoring resonant responses to sinusoidal forcing through dynamic light scattering. Preliminary analysis of the former indicates a significant difference from measurements on the ground, while the latter confirms nicely laboratory experiments with the same instrument and predictions from computer simulations.
    Keywords: Inorganic and Physical Chemistry
    Type: Microgravity Science Laboratory (MSL-1); 186-195; NASA/CP-1998-208868
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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