Ting Luo1, Pengfei Zhang2, Dongxu Cheng3, Congcong Li1, Junyi Shen1, Mingyue Yang1, Jie Zhao1, Kai Zhang1, Qianyuan Yu This email address is being protected from spambots. You need JavaScript enabled to view it.2, Zhandong Shi This email address is being protected from spambots. You need JavaScript enabled to view it.2 

1 School of Measurement and Testing Engineering, China Jiliang University, Hangzhou 310018, China
2 Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou 450001, China
3 China Tobacco Henan Industrial Co., Ltd., Hunan 410007, China


Received: March 28, 2024
Revised: June 1, 2024
Accepted: June 24, 2024

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.4209/aaqr.240086  

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Cite this article:

Ting Luo, Pengfei Zhang, Dongxu Cheng, Congcong Li, Junyi Shen, Mingyue Yang, Jie Zhao, Kai Zhang, Qianyuan Yu, Zhandong Shi (2024). Coagulation Characteristics of Nano-agglomerates in Free Molecular States under Different Electric Field Intensities. Aerosol Air Qual. Res. https://doi.org/10.4209/aaqr.240086


HIGHLIGHTS

  • Using fractal dimension as a parameter improved particle coagulation accuracy.
  • Fractal dimension and electric field intensity studied for coagulation effects.
  • Electric field makes particles have multi-dispersion and even forms new particles.
 

ABSTRACT 


The coagulation behavior of nanoparticles in microfluidic chip channels is complex and affected by various external factors, including electric fields, sound fields, and wakes. Among them, electric fields have been confirmed to be the most effective for combining and manipulating particles to create new materials with diverse functionalities. In this work, the coagulation characteristics of nanoparticles in the electric field were studied, and the feasibility of the simplified Smoluchowski’s equation (SE) by Taylor-expansion moment method (TEMOM) when considering non-spherical particle shapes was verified. The results showed that the particle evolution process obtained by introducing fractal dimension was closer to reality. Compared to spherical particles, non-spherical particles are often observed to exhibit potentially stronger coagulation processes, potentially faster aggregation and growth rates, and potentially lower concentrations of surrounding particles. At the same time, due to the increase in collision, coagulation, and fracture times, the dispersed particle system has stronger multi-dispersion, and more new particles of different sizes are formed. Specifically, the concentration of charged non-spherical particles at time τ = 0.5 is about 6.25 times lower than that of charged spherical particles. Similarly, at time τ = 10, the dispersion of charged non-spherical particles is 700 million times greater than that of charged spherical particles. Furthermore, when charged particles with different fractal dimensions are subjected to the same electric field intensity, their coagulation processes exhibit nearly identical behavior. The results of this study are of great significance for guiding the assembly of nanoparticles.


Keywords: Nanoparticle, Non-spherical, Dielectric particles, Coagulation




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