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Theoretical study of miscibility and glass-forming trends in mixtures of polystyrene spheresA theoretical study of glass-forming trends and miscibility in mixtures of polystyrene spheres (polyballs) of different diameters, suspended in an aqueous solution, is presented. The polyballs are assumed to be charged and to interact via a Debye-Hueckel screened Coulomb potential. The Helmholtz free energy is calculated from a variational principle based on the Gibbs-Bogoliubov inequality, in which a mixture of hard spheres of different diameters is chosen as the reference system. It is found that when the charges of the two types of polyballs are sufficiently different, the variationally determined ratio of hard-sphere diameters differs substantially, leading to packing difficulties characteristic of glass formation. The experimentally observed range of glass formation corresponds to a ratio of hard-sphere diameters of 0.8 or less. Calculations of the free energy as a function of concentration indicate that the liquid polyball mixture is stable against the phase separation, even for widely different polyball charges.
Document ID
19840050386
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Shih, W.-H.
(Ohio State Univ. Columbus, OH, United States)
Stroud, D.
(Ohio State University Columbus, OH, United States)
Date Acquired
August 11, 2013
Publication Date
May 1, 1984
Publication Information
Publication: Journal of Chemical Physics
Volume: 80
ISSN: 0021-9606
Subject Category
Inorganic And Physical Chemistry
Accession Number
84A33173
Funding Number(s)
CONTRACT_GRANT: NASW-3601
CONTRACT_GRANT: NSF DMR-81-19368
Distribution Limits
Public
Copyright
Other

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