Effects of Interfacial Shear on Particle Aggregation at an Oil/Water Interface,Langmuir

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Effects of Interfacial Shear on Particle Aggregation at an Oil/Water Interface
Langmuir ( IF 3.7 ) Pub Date : 2022-07-27 , DOI: 10.1021/acs.langmuir.2c01159
Nader Laal-Dehghani ₁ , Gordon F Christopher ₁

Affiliation

Using a Stokesian dynamics simulation, the microstructure of particle aggregates at an oil/water interface with an applied Couette flow is studied. The results of the aggregation are consistent with previously published experimental work demonstrating multiple regimes of behavior based on the relative strength of shear and capillary forces. In previous work, densification of aggregates at low shear rates was theorized to occur due to short time scale fragmentation/reaggregation of aggregates with rigid particle bonds. In simulations, densification is observed at low shear rates but occurs due to local reorganization of particles due to capillary torques over long time scales. Moderate shear rates create mobile bonds between particles at shorter time scales, allowing aggregates to fragment without reaggregation into smaller isolated clusters, consistent with prior experimental work. At the highest shear rates, aggregation is inhibited completely.

中文翻译：

界面剪切对油/水界面颗粒聚集的影响

使用斯托克斯动力学模拟，研究了在油/水界面处应用库埃特流的颗粒聚集体的微观结构。聚集的结果与先前发表的实验工作一致，该工作表明基于剪切力和毛细力的相对强度的多种行为方式。在以前的工作中，理论上认为在低剪切速率下聚集体的致密化是由于具有刚性颗粒键的聚集体的短时间尺度碎裂/重新聚集而发生的。在模拟中，在低剪切速率下观察到致密化，但由于长时间尺度上的毛细管扭矩导致颗粒的局部重组而发生。适中的剪切速率在较短的时间尺度上在颗粒之间产生移动键，使聚集体在不重新聚集成较小的孤立簇的情况下破碎，与之前的实验工作一致。在最高剪切速率下，完全抑制聚集。

更新日期：2022-07-27

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