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Microfluidic Laser-Induced Nucleation of Supersaturated Aqueous Glycine Solutions
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2020-09-09 , DOI: 10.1021/acs.cgd.0c00669 Tianyi Hua 1 , Celymar Valentín-Valentín 1 , Omar Gowayed 1 , Seongha Lee 1 , Bruce A. Garetz 1 , Ryan L. Hartman 1
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2020-09-09 , DOI: 10.1021/acs.cgd.0c00669 Tianyi Hua 1 , Celymar Valentín-Valentín 1 , Omar Gowayed 1 , Seongha Lee 1 , Bruce A. Garetz 1 , Ryan L. Hartman 1
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Nonphotochemical laser-induced nucleation (NPLIN) of supersaturated aqueous glycine solutions was studied at a wavelength of 1064 nm using a microfluidic device. Crystal shape, size, and number were characterized in situ in real time on the chip. The influence of the laser pulse intensity on the nucleation kinetics was reported. Aging of the supersaturated solutions was necessary to observe NPLIN; fresh solutions did not nucleate. Crystal structure was found to switch from the α- to the γ-polymorph as the supersaturation increased. The observed number of crystals formed exhibited a threshold intensity but was otherwise proportional to the laser intensity, consistent with the dielectric polarization model, although the “lability” calculated from classical nucleation theory was too large by many orders of magnitude. Dynamic light scattering data revealed nanodroplets, hundreds of nanometers in diameter, formed in aged supersaturated aqueous glycine solutions; these submicron sized nanodroplets were apparently necessary for NPLIN. A new model combining the dielectric polarization model and two-step nucleation theory via submicron nanodroplets was proposed to explain these observations, providing a reasonable match between experiment and theory.
中文翻译：
微流控激光诱导的过饱和甘氨酸水溶液成核
使用微流控装置在1064 nm波长下研究了过饱和甘氨酸水溶液的非光化学激光诱导的成核（NPLIN）。晶体的形状，大小和数量在芯片上实时进行了实时表征。据报道激光脉冲强度对成核动力学的影响。为了观察NPLIN，过饱和溶液的老化是必要的。新鲜溶液没有成核。发现随着过饱和度的增加，晶体结构从α-型转变为γ-型。尽管从经典成核理论计算出的“不稳定性”太大了多个数量级，但观察到的晶体形成数量却显示出阈值强度，但与激光强度成正比，与电介质极化模型一致。动态光散射数据显示，在老化的过饱和甘氨酸水溶液中形成了直径为数百纳米的纳米液滴。这些亚微米级的纳米滴显然是NPLIN所必需的。提出了一种通过亚微米纳米液滴结合介电极化模型和两步成核理论的新模型来解释这些现象，从而在实验和理论之间提供合理的匹配。
更新日期：2020-10-07
中文翻译：
微流控激光诱导的过饱和甘氨酸水溶液成核
使用微流控装置在1064 nm波长下研究了过饱和甘氨酸水溶液的非光化学激光诱导的成核（NPLIN）。晶体的形状，大小和数量在芯片上实时进行了实时表征。据报道激光脉冲强度对成核动力学的影响。为了观察NPLIN，过饱和溶液的老化是必要的。新鲜溶液没有成核。发现随着过饱和度的增加，晶体结构从α-型转变为γ-型。尽管从经典成核理论计算出的“不稳定性”太大了多个数量级，但观察到的晶体形成数量却显示出阈值强度，但与激光强度成正比，与电介质极化模型一致。动态光散射数据显示，在老化的过饱和甘氨酸水溶液中形成了直径为数百纳米的纳米液滴。这些亚微米级的纳米滴显然是NPLIN所必需的。提出了一种通过亚微米纳米液滴结合介电极化模型和两步成核理论的新模型来解释这些现象，从而在实验和理论之间提供合理的匹配。
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