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首页> 外文期刊>Crystal growth & design >Crystal Engineering of L?Alanine with L?Leucine Additive using Metal- Assisted and Microwave-Accelerated Evaporative Crystallization
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Crystal Engineering of L?Alanine with L?Leucine Additive using Metal- Assisted and Microwave-Accelerated Evaporative Crystallization

机译：金属辅助和微波加速蒸发结晶法对含L？亮氨酸添加剂的L？丙氨酸进行晶体工程

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In this work, we demonstrated that the change in the morphology of L-alanine crystals can be controlled with the addition of L-leucine using the metal-assisted and microwave accelerated evaporative crystallization (MAMAEC) technique. Crystallization experiments, where an increasing stoichiometric amount of L-leucine is added to initial L-alanine solutions, were carried out on circular poly(methyl methacrylate) (PMMA) disks modified with a 21-well capacity silicon isolator and silver nanoparticle films using microwave heating (MA-MAEC) and at room temperature (control experiments). The use of the MA-MAEC technique afforded for the growth of L-alanine crystals with different morphologies up to ～10-fold faster than those grown at room temperature. In addition, the length of L-alanine crystals was systematically increased from ～380 to ～2000 μm using the MA-MAEC technique. Optical microscope images revealed that the shape of L-alanine crystals was changed from tetragonal shape (without L-leucine additive) to more elongated and wire-like structures with the addition of the L-leucine additive. Further characterization of Lalanine crystals was undertaken by Fourier transform infrared (FT-IR) spectroscopy, Raman spectroscopy and powder X-ray diffraction (PXRD) measurements. In order to elucidate the growth mechanism of L-alanine crystals, theoretical simulations of Lalanine’s morphology with and without L-leucine additive were carried out using Materials Studio software in conjunction with our experimental data. Theoretical simulations revealed that the growth of L-alanine’s {011} and {120} crystal faces were inhibited due to the incorporation of L-leucine into these crystal faces in selected positions.
机译：在这项工作中，我们证明了使用金属辅助和微波加速蒸发结晶（MAMAEC）技术，通过添加L-亮氨酸可以控制L-丙氨酸晶体的形态变化。使用微波通过21孔容量硅隔离器和银纳米颗粒膜改性的圆形聚（甲基丙烯酸甲酯）（PMMA）圆盘进行了结晶实验，在化学实验中将增加的化学计量的L-亮氨酸添加到初始L-丙氨酸溶液中。加热（MA-MAEC）和室温下（对照实验）。 MA-MAEC技术的使用为不同形态的L-丙氨酸晶体的生长提供了比室温下生长快约10倍的晶体。此外，使用MA-MAEC技术将L-丙氨酸晶体的长度从380微米增加到2000微米。光学显微镜图像显示，通过添加L-亮氨酸添加剂，L-丙氨酸晶体的形状从四边形（没有L-亮氨酸添加剂）改变为更细长的丝状结构。通过傅立叶变换红外（FT-IR）光谱，拉曼光谱和粉末X射线衍射（PXRD）测量对拉丙氨酸晶体进行了进一步表征。为了阐明L-丙氨酸晶体的生长机理，结合我们的实验数据，使用Materials Studio软件对有或没有L-亮氨酸添加剂的Lalanine形态进行了理论模拟。理论模拟表明，由于在选定位置将L-亮氨酸掺入这些晶面，因此抑制了L-丙氨酸的{011}和{120}晶面的生长。

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