1993 Volume 19 Issue 6 Pages 1081-1088
Surfaces of single crystals of s-carboxymethyl-L-crysteine (L-SCMC) grown in NaCl-doped supersaturated solution of DL-SCMC were observed. The generation rates of D-and L-fine crystals on the surface of the parent crystals (L-seed) were proportional to the 2.7 th and 1st power of operational supersaturation, respectively, . but were independent of the superficial velocity of the solution. Generation of D-fine crystals in the supersaturated solution began to be observed about 2 hours after D-fine crystals began to be observed on the surface of L-seed. From these experimental results, the generation of D-fine crystals is thought to be attributable to a heterogeneous nucleation mechaism. The D-fine crystals in the solution are thought to be born by the removal of the fine crystals on the L-seed. The generation rates of D-fine crystals and the induction time were also correlated with a classical heterogeneous nucleation rate equation. L-fine crystals were observed throughout the experimental in the supersaturated solution, but it was not found that whether heterogeneous nucleation or sticking of the fine crystals influenced the generation of L-fine crystals.
