铜对水溶液中棒状CaSO₄·2H₂O成核动力学及结晶的影响。
Effect of Cu on the nucleation kinetics and crystallization of rod-shaped CaSO·2HO in aqueous solution.
作者信息
Sun Xiangbin, Wang Xianshun, Zhang Genlei, Cui Peng, Shen Hao
机构信息
School of Chemistry and Chemical Engineering, Anhui Province Key Laboratory of Controllable Chemistry Reaction and Material Chemical Engineering, Hefei University of Technology Hefei 230009 China
School of Materials Science and Engineering, Hefei University of Technology Hefei 230009 China.
出版信息
RSC Adv. 2019 Nov 5;9(62):36020-36026. doi: 10.1039/c9ra07640a. eCollection 2019 Nov 4.
In this study, a simple and efficient strategy is developed to synthesize rod-like CaSO·2HO (DH) crystals with tunable aspect ratio in aqueous solution using Cu as modifier. The aspect ratio and length of the DH crystals are effectively reduced to 5.7 : 1 and about 35 μm in the presence of Cu, respectively. The interfacial tension value () in the aqueous solution is improved significantly with the assistance of Cu, yet the nucleation rate () of the DH crystal is decreased sharply. The interfacial tension value () in the aqueous solution is improved and the nucleation rate () of the DH crystal is drastically decreased due to the introduction of Cu, leading to the induction time of the DH crystallization being extended from 4 min to 25 min. The diversification of morphology for the DH crystals is incited by the changes of nucleation kinetics and Cu incorporated into the crystal lattice, affecting the crystal growth habit, and finally controlling the growth of DH crystals in aqueous solution.
在本研究中，开发了一种简单有效的策略，以铜作为改性剂，在水溶液中合成纵横比可调的棒状CaSO·2HO（DH）晶体。在铜存在的情况下，DH晶体的纵横比和长度分别有效降低至5.7∶1和约35μm。在铜的辅助下，水溶液中的界面张力值（）显著提高，但DH晶体的成核速率（）急剧下降。由于铜的引入，水溶液中的界面张力值（）提高，DH晶体的成核速率（）急剧下降，导致DH结晶的诱导时间从4分钟延长至25分钟。成核动力学的变化以及铜掺入晶格中引发了DH晶体形态的多样化，影响了晶体生长习性，最终控制了DH晶体在水溶液中的生长。
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