在微流控装置中通过乳液结晶连续生产 NaCl 球形颗粒,Crystal Growth & Design

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在微流控装置中通过乳液结晶连续生产 NaCl 球形颗粒
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2023-11-07 , DOI: 10.1021/acs.cgd.3c00973
Liucong Chen ₁ , Jingtao Wang ₁

Affiliation

在本文中，提出了一种基于乳液溶剂扩散连续生产单分散球形氯化钠（NaCl）结晶颗粒的微流体系统。NaCl颗粒的生产过程分为四个阶段：液滴生成、结晶、团聚和固结。调节 NaCl 溶液的初始浓度和连续相（CP）的流量，以改变小立方晶体（单位晶体）团聚形成的球形颗粒的形貌和微观结构。在这些单元晶体中观察到新颖的漏斗状和框架状表面结构，它们都是由阶梯状方形表面微结构构成的，这可能可以显示晶体的生长模式和机制。球形颗粒的平均圆度最高为0.94，粒径变异系数最低为2.87%，表现出良好的球形度和较窄的粒径分布。此外，通过改变CP流量，可以获得不同的颗粒，从球形颗粒到多晶簇再到单晶。此外，还计算了颗粒孔隙率，为设计具有预期孔隙率的颗粒提供参考。

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Continuous Production of NaCl Spherical Particles via Emulsion Crystallization in Microfluidic Devices

In this article, a microfluidic system for the continuous production of monodisperse spherical sodium chloride (NaCl) crystalline particles based on emulsion solvent diffusion is presented. The production process of NaCl particles is divided into four stages: droplet generation, crystallization, agglomeration, and consolidation. The initial concentration of NaCl solution and the flow rate of the continuous phase (CP) are adjusted to change the morphology and microstructure of the spherical particles formed through the agglomeration of the small cubic crystals (unit crystals). Novel hopper-like and frame-like surface structures are observed in these unit crystals, and both of them are constructed by the stepped square surface microstructure, which probably could show the growth pattern and mechanism of crystals. The highest average circularity of spherical particles is 0.94, and the lowest coefficient of variation of the particle size is 2.87%, which shows a fine sphericity and narrow particle size distribution. Furthermore, by changing the CP flow rate, different particles, from the spherical particle to the cluster of multiple crystals and to the single crystal, are obtained. In addition, the particle porosity is calculated to provide a reference for designing particles with an expected porosity.

更新日期：2023-11-07

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