Usual and unusual crystallization from solution
Usual and unusual crystallization from solution
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DOI：
10.1016/j.jcrysgro.2010.01.006
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发表时间：
2010-03-15
影响因子：
1.8
通讯作者：
Veesler, Stephane
中科院分区：
文献类型：
--
作者：
Revalor, Eve;Hammadi, Zoubida;Veesler, Stephane
成核是一种随机现象，观察到临界成核的概率很低。我们的目标是加强亚稳区的形核，使我们能够定位和控制它。第一步是确定成核速率，从而确定所研究的分子的成核行为。测定成核速率的两种常用方法是直接计数/观察法测定诱导时间和直接测定均匀成核的稳态速率。第二步是作用于成核，以控制、定位和观察它。我们开发了不同寻常的方法，向结晶条件添加外场或使用限制。超声波缩短了诱导时间，增加了晶体数量。光照射通过形成自由基来诱导成核。电场倾向于在一个电极附近局部成核，这取决于所研究的分子的极性对溶液密度的局部作用。最后对约束进行了测试，结果表明这种方法在空间上控制成核是非常有希望的，并且每个液滴产生一个单晶。(C)2010爱思唯尔B.V.保留所有权利。
Nucleation is a stochastic phenomenon and the probability of observing the critical nuclei formation is very low. Our aim is to enhance nucleation in the metastable zone enabling us to locate and control it. The first step is to determine the nucleation rate, and thus the nucleation behavior of the molecule studied. The two usual methods for determining nucleation rate are measuring induction time by direct counting/observation and direct determination of the steady-state rate of homogeneous nucleation. The second step consists in acting on nucleation, to control, locate and observe it. We develop unusual approaches, adding an external field to the crystallization conditions or using confinement. Ultrasounds reduce induction time and increase the number of crystals. The light irradiation induces nucleation by forming radicals. The electric field tends to localize the nucleation near one electrode depending on the polarity of the molecule studied in acting locally on the density of the solution. Lastly confinement was tested, and results indicate that this approach is very promising for controlling nucleation spatially and generate one single crystal per droplet. (C) 2010 Elsevier B.V. All rights reserved.