A Consideration on the Orientation of L-Alanine Crystals under a Magnetic Field

概要

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The effect of a magnetic field on the orientation of diamagnetic, non-aromatic L-alanine crystals was investigated. L-alanine was crystallized from a supersaturated aqueous solution in a magnetic field of 5 T. Short prismatic crystals were oriented so that their crystallographic c-axes were aligned parallel to the direction of the magnetic field. A newly designed microscope-interferometer was used for in situ observation of crystallization processes under the magnetic field. According to the observation, the c-axes of small nucleated crystals were forced to align parallel to the magnetic field direction even when the crystals were migrating in the solution due to thermal convection. Characteristic features of the orientation were explained by the small magnetic anisotropy of the L-alanine crystal, which should be derived from the CO_2 groups.
日本結晶成長学会の論文
2003-03-25