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SAXS study of the nucleation of glycine crystals from a supersaturated solution

机译：SAXS研究过饱和溶液中甘氨酸晶体成核

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摘要

Nucleation of crystalline solids, the first stage of crystallization from solution, is not yet fully understood. This is true for both small molecules of low molecular weight and more complicated large molecules. To obtain direct structural information about the process of nucleation and crystallization of small molecules, small-angle X-ray scattering (SAXS) has been used to study the crystallization of the amino acid glycine from its supersaturated aqueous solution. The scattering data was analyzed using the unified fit model, which is well-suited for studying complex systems that may contain multiple levels of related structural features. The results suggest that glycine molecules exist as dimers in supersaturated solution. The system obeys power-law behavior that indicates the presence of fractals in the solution. A transformation from mass fractal structure to surface fractal structure is observed during the crystallizatioia process, which could be the signature of a two-step nucleation process.
机译：从溶液中结晶的第一步，结晶固体的成核作用尚未完全理解。对于低分子量的小分子和更复杂的大分子都是如此。为了获得有关小分子成核和结晶过程的直接结构信息，小角度X射线散射（SAXS）已用于研究氨基酸甘氨酸从其过饱和水溶液中的结晶。使用统一拟合模型分析了散射数据，该模型非常适合研究可能包含多个级别的相关结构特征的复杂系统。结果表明甘氨酸分子以二聚体形式存在于过饱和溶液中。该系统遵循幂律行为，该行为表明溶液中存在分形。在结晶过程中观察到从质量分形结构到表面分形结构的转变，这可能是两步成核过程的标志。

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