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On Precipitation of Sparingly Soluble Fluoride Salts
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2018-01-05 00:00:00 , DOI: 10.1021/acs.cgd.7b01115 Ricco T. Kügler 1 , Matthias Kind 1
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2018-01-05 00:00:00 , DOI: 10.1021/acs.cgd.7b01115 Ricco T. Kügler 1 , Matthias Kind 1
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The classical approaches for nucleation rate and diffusion-limited crystal growth are checked for their validity for sparingly soluble salts, i.e., calcium fluoride and strontium fluoride. Particle size distributions are calculated by population balance modeling as a function of the initial supersaturation and free lattice ion ratio. Theoretical results are compared with experimentally determined particle sizes which are measured by dynamic light scattering technique. Before measurement, suspensions were stabilized by dilution with deionized water or surfactant solution. The dilution of suspensions was done after solid liquid equilibrium had been reached. Consequently, particle formation mechanisms, such as nucleation and crystal growth which depend on supersaturation, are assumed to be unaffected. If supersaturation is calculated correctly by considering activities and ion complex formation, we found that experimental results are predictable by modeling with classical approaches. Hereby, interfacial energy is the only fitting parameter. Furthermore, the diffusion-limited crystal growth rate decreases with deviation from stoichiometric precipitation condition due to the lower transport flux of the shortfall ion.
中文翻译：
关于微溶氟化盐的沉淀
检查了用于成核速率和扩散受限的晶体生长的经典方法对于难溶盐（即氟化钙和氟化锶）的有效性。粒度分布是通过种群平衡模型计算的，是初始过饱和度和自由晶格离子比率的函数。将理论结果与通过动态光散射技术测量的实验确定的粒度进行比较。在测量之前，通过用去离子水或表面活性剂溶液稀释来稳定悬浮液。在达到固液平衡后进行悬浮液的稀释。因此，假定不依赖于过饱和的颗粒形成机制，例如成核和晶体生长。如果通过考虑活性和离子配合物的形成正确地计算了过饱和度，我们发现通过经典方法进行建模可以预测实验结果。因此，界面能是唯一的拟合参数。此外，由于短缺离子的较低的传输通量，扩散限制的晶体生长速率随着与化学计量沉积条件的偏离而降低。
更新日期：2018-01-05
中文翻译：
关于微溶氟化盐的沉淀
检查了用于成核速率和扩散受限的晶体生长的经典方法对于难溶盐（即氟化钙和氟化锶）的有效性。粒度分布是通过种群平衡模型计算的，是初始过饱和度和自由晶格离子比率的函数。将理论结果与通过动态光散射技术测量的实验确定的粒度进行比较。在测量之前，通过用去离子水或表面活性剂溶液稀释来稳定悬浮液。在达到固液平衡后进行悬浮液的稀释。因此，假定不依赖于过饱和的颗粒形成机制，例如成核和晶体生长。如果通过考虑活性和离子配合物的形成正确地计算了过饱和度，我们发现通过经典方法进行建模可以预测实验结果。因此，界面能是唯一的拟合参数。此外，由于短缺离子的较低的传输通量，扩散限制的晶体生长速率随着与化学计量沉积条件的偏离而降低。
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