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Crystal nucleation of nano crystallite strontium malonate without and with additives

机译：含和不含添加剂的纳米微晶丙二酸锶晶体成核

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摘要

A basic study was carried out to understand the crystallization of nano crystallite strontium malonate without and with addition of sodium dodecyl sulfate surfactant (SDS) or poly ethylene glycol (PEG). Induction time was measured under different supersaturations ranging from 2.6 to 4.3 using conductivity method. The induction time was estimated from the time vs conductivity of the solution. The results show that, the induction time decreases exponentially with increasing the supersaturation. On the other hand, the induction time is decreased with addition of SDS or PEG. Using an equation that relates induction times and supersaturation ratios, free energy barrier, and critical nuclei radius were calculated. The results revealed that decrease of free energy barrier and critical nuclei radius as supersaturation increased and by addition of SDS or PEG. In addition, the calculated surface energy of strontium malonate crystals was decreased from 6.0 to 5.7 and 5.5 mJ/m~2 with SDS and PEG, respectively. In addition, the precipitated crystals are agglomerated as shown using scanning electron microscopy (SEM) investigation. In addition, the crystallite sizes of the formed crystals without and with SDS or PEG are 244, 222 and 121 nm, respectively.
机译：进行了基础研究，以了解不添加或添加十二烷基硫酸钠表面活性剂（SDS）或聚乙二醇（PEG）的纳米微晶丙二酸锶的结晶。使用电导率法在2.6至4.3的不同过饱和度下测量诱导时间。从时间对溶液的电导率估计诱导时间。结果表明，诱导时间随过饱和度的增加呈指数下降。另一方面，通过添加SDS或PEG可以减少诱导时间。使用与感应时间和过饱和比相关的方程式，计算了自由能垒和临界核半径。结果表明，通过添加SDS或PEG，随着过饱和度的增加，自由能垒和临界核半径减小。另外，使用SDS和PEG将丙二酸锶晶体的计算表面能分别从6.0降低至5.7和5.5 mJ / m〜2。另外，如使用扫描电子显微镜（SEM）研究所示，沉淀的晶体被附聚。另外，不使用SDS或PEG和使用SDS或PEG时形成的晶体的微晶尺寸分别为244、222和121nm。

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