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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Kinetic analyses of crystallization and devitrification: Comparison of activation energies in aqueous solutions of glycerol and dimethyl sulphoxide
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Kinetic analyses of crystallization and devitrification: Comparison of activation energies in aqueous solutions of glycerol and dimethyl sulphoxide

机译：结晶和失透的动力学分析：甘油和二甲基亚砜水溶液中的活化能比较

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摘要

Crystal growth rates in glass forming 50 w/w% glycerol and 45 ww% dimethyl sulphoxide (DMSO) aqueous solutions were found to follow Arrhenius behaviour over a broad range of temperatures. Activation energies for ice crystal growth in these solutions were determined from Arrhenius plots of the isothermal crystal growth rate data. The values for the activation energy of crystal growth were found to be the same for each solution, suggesting that the activation energy barrier to transport of water molecules across the ice-solution interface is the same in both solutions. The activation energies were compared to activation energy of crystallization values given by several non-isothermal DSC kinetic analysis techniques. It was found for 15 w/w% DMSO that the activation energy for growth war equal to the activation energy for the whole crystallization process. This was not the case for 50 w/w% glycerol solutions, an observation which highlights the inapplicability of the standard analysis techniques under conditions of continued nucleation.
机译：发现形成玻璃的50 w / w％甘油和45 w w％的二甲基亚砜（DMSO）水溶液中的晶体生长速率在很宽的温度范围内都遵循阿伦尼乌斯行为。这些溶液中冰晶生长的活化能由等温晶体生长速率数据的Arrhenius图确定。发现每种溶液的晶体生长活化能值均相同，这表明在两种溶液中，水分子通过冰-溶液界面传输的活化能垒均相同。将活化能与几种非等温DSC动力学分析技术给出的结晶化活化能值进行了比较。发现对于15w / w％的DMSO，生长战争的活化能等于整个结晶过程的活化能。 50 w / w％甘油溶液不是这种情况，这一观察结果突出了标准分析技术在连续成核条件下的不适用性。

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