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首页> 外文期刊>Crystal growth & design >Recrystallization, Phase Composition, and Local Structure of Amorphous Lactose from the Total Scattering Pair Distribution Function
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Recrystallization, Phase Composition, and Local Structure of Amorphous Lactose from the Total Scattering Pair Distribution Function

机译:从总散射对分布函数看无定形乳糖的重结晶,相组成和局部结构

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Total scattering pair distribution function (TSPDF) analysis of synchrotron X-ray diffraction data has been used to study the structural characteristics of amorphous lactose and its subsequent recrystallization on aging. This shows that the recrystallization kinetics vary substantially between spray dried, lyophilized, and melt quenched samples aged at 40 degrees C/75% relative humidity (RH), although all samples consistently form the stable a monohydrate when crystallization does occur. Using TSPDF it was possible to quantify the amount of amorphous and crystalline phases present, as well as to extract other structural information such as crystallite size, as a function of time during aging from the different starting materials. We also were able to determine a correlation between a higher degree of local molecular ordering in the amorphous phase with decreased stability against recrystallization. This study shows the rich information that may be obtained from a TSPDF analysis of recrystallization from the amorphous state in organic systems.
机译:同步加速器X射线衍射数据的总散射对分布函数(TSPDF)分析已用于研究非晶态乳糖的结构特征及其在老化后的重结晶。这表明在40°C / 75%相对湿度(RH)老化的喷雾干燥,冻干和熔融淬火样品之间,重结晶动力学有很大不同,尽管当确实发生结晶时所有样品始终形成稳定的一水合物。使用TSPDF可以量化存在的非晶相和结晶相的数量,并可以从不同的起始材料中提取其他结构信息(如微晶尺寸),这些信息是老化过程中时间的函数。我们还能够确定非晶相中较高程度的局部分子有序与降低的抗重结晶稳定性之间的相关性。这项研究表明,可以从TSPDF分析有机系统中非晶态的重结晶中获得丰富的信息。

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