Crystallization Behavior and Nucleation Kinetics of Organic Melt Droplets in a Microfluidic Device,Crystal Growth & Design

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Crystallization Behavior and Nucleation Kinetics of Organic Melt Droplets in a Microfluidic Device
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2018-04-25 00:00:00 , DOI: 10.1021/acs.cgd.7b01697
Burkard Spiegel ₁ , Alexander Käfer ₁ , Matthias Kind ₁

Affiliation

The powerful technique of microfluidics is applied for the first time to investigate the crystallization behavior and nucleation kinetics of monodisperse organic melt droplets in the range of a few nanoliters. Multiple characteristic time scales in the fraction of (un)crystallized droplets are found. We interpret these findings regarding mechanisms discussed in microfluidics or oil-in-water emulsions and with the help of inverse Laplace transformation. Heterogeneous active centers, for example, various catalytic impurities, cause fast nucleation in multiple droplet populations with different rates. The nucleation of the remaining droplets in the later stage of the experiment is dominated by only one, slower nucleation rate. The related mechanism is most likely surfactant-driven heterogeneous nucleation at the surface or in the droplet volume. Homogeneous nucleation is excluded at this droplet size and the supercooling values examined. Hexadecane (C16) and ethylene glycol distearate (EGDS) are used as exemplary organic melt substances. Our results prove that the application of microfluidics to organic melt droplets enables an optical examination of monodisperse droplets without droplet interactions to study nucleation. This provides new opportunities to investigate fundamental parameters in the field of emulsion crystallization.

中文翻译：

微流控装置中有机熔滴的结晶行为和成核动力学

首次应用了强大的微流控技术来研究数纳升范围内的单分散有机熔体液滴的结晶行为和成核动力学。在（未）结晶液滴的分数中发现了多个特征时间标度。我们解释这些发现有关微流控或水包油乳液中讨论的机制，并借助拉普拉斯逆变换。异构的活性中心，例如各种催化杂质，会以不同的速率在多个液滴群体中引起快速成核。在实验的后期，其余液滴的形核仅以一个较慢的形核速率为主导。相关的机制很可能是表面活性剂驱动的表面异质形核或液滴体积中的异质形核。在该液滴尺寸下，均相成核被排除在外，并且检查了过冷值。十六烷（C16）和乙二醇二硬脂酸酯（EGDS）被用作示例性有机熔体物质。我们的结果证明，将微流体应用于有机熔体液滴可以对单分散液滴进行光学检查，而无需液滴相互作用来研究成核作用。这为研究乳液结晶领域的基本参数提供了新的机会。我们的结果证明，将微流体应用于有机熔体液滴可以对单分散液滴进行光学检查，而无需液滴相互作用来研究成核作用。这为研究乳液结晶领域的基本参数提供了新的机会。我们的结果证明，将微流体应用于有机熔体液滴可以对单分散液滴进行光学检查，而无需液滴相互作用来研究成核作用。这为研究乳液结晶领域的基本参数提供了新的机会。

更新日期：2018-04-25

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