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Experimental evidence for excess entropy discontinuities in glass-forming solutions.
J Chem Phys ; 136(7): 074515, 2012 Feb 21.
Artigo em Inglês | MEDLINE | ID: mdl-22360256
ABSTRACT
Glass transition temperatures T(g) are investigated in aqueous binary and multi-component solutions consisting of citric acid, calcium nitrate (Ca(NO(3))(2)), malonic acid, raffinose, and ammonium bisulfate (NH(4)HSO(4)) using a differential scanning calorimeter. Based on measured glass transition temperatures of binary aqueous mixtures and fitted binary coefficients, the T(g) of multi-component systems can be predicted using mixing rules. However, the experimentally observed T(g) in multi-component solutions show considerable deviations from two theoretical approaches considered. The deviations from these predictions are explained in terms of the molar excess mixing entropy difference between the supercooled liquid and glassy state at T(g). The multi-component mixtures involve contributions to these excess mixing entropies that the mixing rules do not take into account.

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Tipo de estudo: Policy_brief Aspecto clínico: Predição / Prognóstico Idioma: Inglês Revista: J Chem Phys Ano de publicação: 2012 Tipo de documento: Artigo País de afiliação: Suíça