Magnetic Orientation of Amino Acid Crystals
Magnetic Orientation of Amino Acid Crystals
复制标题
氨基酸晶体的磁取向
DOI：
10.1252/jcej.35.1123
复制
发表时间：
2002
影响因子：
0.8
通讯作者：
K. Shimizu
中科院分区：
文献类型：
--
作者：
K. Ogawa;F. Yagi;E. Suzuki;L. A. Guzman;K. Shimizu
研究了磁场对抗磁性非芳香氨基酸晶体取向的影响。氨基酸，如l -丙氨酸或甘氨酸，从过饱和溶液（纯和含有其他氨基酸作为添加剂）在垂直或水平高磁场下结晶。制备了一种在强磁场下进行原位观察的光学显微镜系统。根据显微镜观察结晶结果，小核l -丙氨酸晶体在溶液中运动的c轴与磁场方向平行。在甘氨酸的例子中，晶体的生长使得ac平面平行，c轴与磁场方向成55°角。这种取向行为是基于反磁性晶体的小磁各向异性来解释的。即使改变了磁场对引力轴的方向，晶体轴对磁场的方向也保持不变。并对非线性光学材料DAST （4-N， n -二甲氨基-4′-N′-甲基-二酰脲基磺酸盐）晶体的磁性取向进行了比较研究。与上述情况类似，在1T中获得的DAST晶体定向使其a轴平行于磁场。在不同的磁场强度下测定了生长晶体的取向比。
The effect of a magnetic field on the orientation of diamagnetic, non-aromatic amino acids crystals was studied. Amino acids, such as L-alanine or glycine, were crystallized from supersaturated solutions (pure and containing other amino acids as additives) under a vertical or horizontal high magnetic field. We prepared an optical microscope system for in situ observation, which could be used under a high magnetic field. According to the observed results of crystallization with the microscope, the c-axes of small nucleated L-alanine crystals moving in the solution were parallel to the direction of the magnetic field. In the case of glycine, the crystals grew so that the ac-planes were parallel and c-axes were at angles of 55° to the direction of magnetic field. This behavior in orientation is explained based on small magnetic anisotropies of diamagnetic crystals.Even if the direction of the magnetic field to the gravitational axis was changed, the directions of crystal axes to the magnetic field remain unchanged. Magnetic orientation of DAST (4-N, N-dimethylamino-4′-N′-methyl-stilbazoliumtosylate) crystal, one of the nonlinear optical materials, was also studied for comparison. As similar to the above case, DAST crystals obtained in 1T were oriented so that their a-axes were parallel to the magnetic field. The orientation ratios of the growing crystals were determined at several intensities of magnetic field.