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Microgravity Effects on Thermodynamic and Kinetic Properties of Colloidal Dispersions
Author(s) -
OKUBO TSUNEO,
TSUCHIDA AKIRA
Publication year - 2002
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1111/j.1749-6632.2002.tb05906.x
Subject(s) - colloid , crystallization , suspension (topology) , diffusion , chemical engineering , chemistry , colloidal particle , materials science , thermodynamics , physics , organic chemistry , mathematics , homotopy , pure mathematics , engineering
A bstract : Microgravity experiments on the physicochemical properties of colloidal dispersions reported hitherto have been reviewed. In microgravity, reliability and reproducibility of experimental data have been improved significantly by the elimination of convection in the suspension. Vanishment of the excess downward diffusion in microgravity has also produced a significant effect on properties of colloidal suspensions. For example, colloidal crystallization rates decreased in microgravity, whereas colloidal alloy crystallization rates increased. These results demonstrate the important role of the segregation effect in normal gravity. Colloidal silica formation reactions are retarded in microgravity, a phenomenon that is correlated deeply with disappearance of the downward diffusion of heavy products.