Single Pulse, Single Crystal Laser-Induced Nucleation of Potassium Chloride
Single Pulse, Single Crystal Laser-Induced Nucleation of Potassium Chloride
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DOI：
10.1021/cg8007415
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发表时间：
2009-02-01
影响因子：
3.8
通讯作者：
Camp, Philip J.
中科院分区：
文献类型：
--
作者：
Alexander, Andrew J.;Camp, Philip J.
证明了非光化学激光诱导的过饱和氯化钾溶液成核。我们已经观察到，一个7 ns的单脉冲近红外（1064 nm）激光可以用来生长氯化钾的单晶。利用激光辐射增强亚临界晶体核的各向同性电子极化和相应的原子核自由能的降低来增强成核的模型对实验结果进行了分析。用经典成核理论计算了亚临界核在零场中变为超临界核的比例；该分数与结晶产率相关，并成功地描述了实验观察到的产率对激光功率和过饱和度的依赖性。对实验结果进行分析，得到晶体-溶液界面张力的现象学值gamma = 2.19 +/- 0.03 mJ m（-2）。
The nonphotochemical laser-induced nucleation of aqueous supersaturated solutions of potassium chloride is demonstrated. We have observed that a single, 7 ns pulse of near-infrared (1064 nm) laser light can be used to grow a single crystal of potassium chloride. The experimental results are analyzed using a model in which nucleation is enhanced through the isotropic electronic polarization of subcritical crystal nuclei by laser radiation and the associated reduction in free energy of the nuclei. Classical nucleation theory is used to calculate the fraction of subcritical nuclei, initially in zero field, which become supercritical in the laser field; this fraction is correlated with the crystallization yield and is shown to successfully describe the dependences of the experimentally observed yields upon laser power and supersaturation. The experimental results are analyzed to obtain a phenomenological value of the crystal-solution interfacial tension, gamma = 2.19 +/- 0.03 mJ m(-2).