首页|Mechanism of nanoparticle aggregation in gas-liquid microfluidic mixing

Mechanism of nanoparticle aggregation in gas-liquid microfluidic mixing

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Using gas-liquid segmented micromixers to prepare nanoparticles that have a homogeneous particle size,controllable shape,and monodispersity advantages.Although nanoparticle aggregation within a mi-crofluid has been shown to be affected by the shear effect,the shear effect triggering conditions in gas-liquid two-phase flow is unclear and the aggregation behavior of nanoparticles under the shear effect is difficult to predict,resulting in uncontrollable physical and chemical properties of nanoparticle ag-gregates.In this study,a numerical simulation of nanoparticle aggregation in gas-liquid two-phase flow under the shear effect is performed using the CFD-DEM method.Then,the effects of total flow rate,gas-liquid two-phase flow ratio,and particle volume fraction on particle aggregation were analyzed to achieve control of particle aggregation shape and size.Meanwhile,the triggering mechanism of the shear effect and the mechanism of the shear effect on the aggregation of nanoparticles were clarified.The re-sults show that increasing the total flow rate or decreasing the gas-liquid two-phase flow rate ratio can induce the shear effect,which reduces the particle aggregation size and makes the morphology tend to be spherical.Moreover,increasing the particle volume fraction,and total flow rate or decreasing the gas-liquid two-phase flow rate ratio also increases the number of particle collisions and induce interpar-ticle adhesion.Hence,particle adhesion and the shear effect compete with each other and together affect particle aggregation.

MicrofluidicGas-liquid segmented micromixerNanoparticle aggregationShear effectNumerical calculation

Hongxia Li、Xiyang Wang、Du Qiao、Jiahao Li、Weiping Zhu、Honglin Li

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Key Laboratory for Precision & Non-traditional Machining Technology of Ministry of Education,Dalian University of Technology,Dalian 116023,China

Shanghai Key Laboratory of New Drug Design,School of Pharmacy,East China University of Science and Technology,Shanghai 200237,China

Shanghai Beyond Limits Manu-facturing Project国家自然科学基金国家自然科学基金中央高校基本科研业务费专项Dalian city supports in-novation and entrepreneurship projects for high-level talentsLiaoning Province's Xing Liao Talents Program

11502044U1906233DUT22JC082021RD16XLYC2002108

2024

10.1016/j.cclet.2023.108747

中国化学快报(英文版)
中国化学会

中国化学快报(英文版)

CSTPCD
影响因子：0.771
ISSN：1001-8417
年,卷(期)：2024.35(4)
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