Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan.
Chem Asian J. 2011 Nov 4;6(11):2878-89. doi: 10.1002/asia.201100105. Epub 2011 Jun 30.
Recent streams of laser studies on crystallization and crystal growth are summarized and reviewed. Femtosecond multiphoton excitation of solutions leads to their ablation at the focal point, inducing local bubble formation, shockwave propagation, and convection flow. This phenomenon, called "laser micro tsunami" makes it possible to trigger crystallization of molecules and proteins from their supersaturated solutions. Femtosecond laser ablation of a urea crystal in solution triggers the additional growth of a single daughter crystal. Intense continuous wave (CW) near infrared laser irradiation at the air/solution interface of heavy-water amino acid solutions results in trapping of the clusters and evolves to crystallization. A single crystal is always prepared in a spatially and temporally controlled manner, and the crystal polymorph of glycine depends on laser power, polarization, and solution concentration. Upon irradiation at the glass/solution interface, a millimeter-sized droplet is formed, and a single crystal is formed by shifting the irradiation position to the surface. Directional and selective crystal growth is also possible with laser trapping. Finally, characteristics of laser-induced crystallization and crystal growth are summarized.
近期关于结晶和晶体生长的激光研究进展被总结和综述。飞秒多光子激发溶液会导致在焦点处的消融，从而诱导局部气泡形成、冲击波传播和对流。这种现象被称为“激光微海啸”，使得从过饱和溶液中触发分子和蛋白质结晶成为可能。飞秒激光在溶液中对尿素晶体的消融会触发单个子晶体的额外生长。在重水氨基酸溶液的空气/溶液界面处进行高强度连续波（CW）近红外激光辐照会导致团簇的捕获，并发展为结晶。总是以空间和时间受控的方式制备单晶，并且甘氨酸的晶体多型取决于激光功率、偏振和溶液浓度。在玻璃/溶液界面处进行辐照时，会形成毫米大小的液滴，通过将辐照位置移动到表面，可以形成单晶。激光捕获还可以实现定向和选择性晶体生长。最后，总结了激光诱导结晶和晶体生长的特点。
