IN-SITU OBSERVATION OF THE CONCENTRATION GRADIENT LAYER AROUND A GROWING CRYSTAL OF LEUCINE COMPLEX

The concentration gradient layer around a growing crystal of L-leucine complex was observed using a Michelson interferometer. From the inter ferograms and growth-rate measurements in the stagnant solution, we co uld estimate the growth mode and the diffusion coefficient of the comp lex of L-leucine (L-leu) and 3,4-dimethylbenzenesulfonic acid (o-DMBS) . Growth rate versus surface supersaturation could be shown as R(<sigm a)) = 2.35 x 10(-7) sigma(1.65), and the diffusion coefficient was est imated to be 7.2 x 10(-10) m(2)/s. The estimated Stokes radius coincid ed with the size of each molecule of L-leu and o-DMBS.