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首页> 外文期刊>Crystal growth & design >Strong additive-surface interaction leads to the unusual revival of growth at solvent-poisoned faces of DL-alanine crystal
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Strong additive-surface interaction leads to the unusual revival of growth at solvent-poisoned faces of DL-alanine crystal

机译：强大的添加剂-表面相互作用导致DL-丙氨酸晶体的溶剂中毒表面异常生长恢复

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摘要

The effects of various anions and cations dissociated from a spectrum of inorganic salts on the growth of dl-alanine polar c-axis have been systematically investigated using in situ microscopic observations on single seed crystals. Surprisingly, it is observed that both the polar -c and +c ends of dl-alanine c-axis undergo a revival of solvent-poisoned dead growth in the presence of every one of the additives used in this study. Furthermore, it is found that divalent ions (e.g., Mg~(2+) and SO_4~(2-)) promote the growth along dl-alanine c-axis more effectively than univalent ions (e.g., Na~+ and Cl~-). Such an ion-induced growth acceleration of dl-alanine c-axis, contrary to the usual understanding, particularly shows an unusual case where important Coulombic interaction between additive and crystal surface can actually favor face growth. This interesting phenomenon is interpreted at the molecular level, with the role of surface roughening particularly highlighted.
机译：已使用单晶种的原位显微镜观察系统地研究了从无机盐光谱中解离出来的各种阴离子和阳离子对dl-丙氨酸极性c轴生长的影响。令人惊讶地，观察到在该研究中使用的每种添加剂的存在下，dl-丙氨酸c轴的-c和+ c极性末端均经历了溶剂中毒的死生长的恢复。此外，发现二价离子（例如，Mg〜（2+）和SO_4〜（2-））比一价离子（例如，Na〜+和Cl〜-）更有效地促进沿dl-丙氨酸c轴的生长。 ）。与通常的理解相反，这种由离子诱导的dl-丙氨酸c轴的生长加速特别显示了一种不寻常的情况，其中添加剂和晶体表面之间的重要库仑相互作用实际上可以促进表面生长。这种有趣的现象在分子水平上得到了解释，表面粗糙化的作用尤其突出。

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