氯酸钠晶体生长的手性对称破损研究

我们使用非搅拌的氯酸钠晶体水溶液,研究了晶体的手性对称破损问题.氯酸钠晶体溶液是通过溶解分析纯 NaClO3 粉末于去离子水中配制而成.采用 Mach-Zehnder 干涉方法和称重法测定晶体的溶解度.使用偏光显微镜鉴定了11545颗晶体的手性.这些晶体是从不同pH条件下的90个自发成核和生长实验中获得.实验结果表明:溶液的pH值可影响到氯酸钠晶体的手性分布.晶体手性分布的pH效应,可用随机动力学理论和胚晶凝聚二次成核理论来定性解释.

New Insights into Chiral Symmetry Breaking in Crystal Growth of NaClO3

The topic on spontaneous chiral symmetry breaking in unstirred crystallization was studied from aqueous solution of NaClO_3. A sodium chlorate solution was prepared by dissolving the A.R. of the NaClO_3 powder in distilled water. A solubility of NaClO_3 solution was measured by both Mach-Zehnder interferometry and a weight technique. Total of 11545 chiral crystals were identified by the polarizers. The crystals were grown on spontaneous nucleation from the 90 runs of experiments with different pH value in solution. An experimental results indicated that the pH value in solution could influence the distribution of the crystal chirality of NaClO_3. The effect of pH might be explained by stochastic kinetics and embryos coagulation secondary nucleation (ECSN) qualitatively.