Synthesis of DL-alanine mesocrystals with a hollow morphology
Synthesis of DL-alanine mesocrystals with a hollow morphology
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DOI：
10.1021/cg800239g
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发表时间：
2008-10-01
影响因子：
3.8
通讯作者：
Mastai, Yitzhak
中科院分区：
文献类型：
--
作者：
Medina, Dana D.;Mastai, Yitzhak
DL-丙氨酸从水/醇过饱和溶液中结晶导致外消旋化合物的沉淀，其显示针状中空形态，与从纯水溶液中生长的针状晶体相反。这种不寻常的形态是通过假设过饱和溶液快速结晶，以产生DL-丙氨酸纳米晶体，组装得到介观晶体来解释的。所得DL-丙氨酸晶体的特征在于通过一系列技术，如X-射线衍射，扫描电子显微镜，显微拉曼，和差示扫描量热法。通过光散射和离子溶液电导率研究了动力学。这些测量结果表明，这些超结构的DL-丙氨酸介晶由三维DL-丙氨酸纳米晶体。最后，提出了中空DL-丙氨酸介晶的形成机理。
The crystallization of DL-alanine from water/alcohol supersaturated solutions results in the precipitation of a racemic compound displaying a needlelike hollow morphology, in contrast to the needlelike crystals grown from pure aqueous solutions. This unusual morphology is explained by assuming that the supersaturated solutions crystallized rapidly to create DL-alanine nanocrystals that assemble to give mesoscale crystals. The resulting DL-alanine crystals are characterized by a range of techniques such as X-ray diffraction, scanning electron microscopy, micro-Raman, and differential scanning calorimetry. The kinetics was studied by light scattering and ion-solution conductivity. These measurements revealed that these superstructures Of DL-alanine mesocrystals consist of three-dimensional DL-alanine nanocrystals. Finally, a mechanism for the formation Of DL-alanine mesocrystals with a hollow morphology is proposed.