Operando investigation of particle re-entrainment mechanism in electrostatic capture process on the lab-on-a-chip  

作　　者：Yong Zhu Yikun Zhang Xiaoyong Yang Shanlong Tao Mingxia Chen Wenfeng Shangguan 

机构地区：[1]Research Center for Combustion and Environmental Technology,School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Journal of Environmental Sciences》2024年第2期337-347,共11页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.52200130 and 22176123);Postdoctoral Science Foundation of China (No.2022M722082);the National Key Research&Development Plan (No.2017YFC0211804)。

摘　　要：Inhalable particle is a harmful air pollutant that causes a significant threat to people's health and ecological environments,which should be removed to purify air,but there exists limited removal efficiency due to particle re-entrainment.Here,Operando observation system based on microscopic visualization method is developed to make in situ test of particle migration,deposition and re-entrainment characteristics on a lab-on-a-chip to achieve the investigation in micro-level scale.The deposition evolution of charged particles is recorded in electric field region intuitively,which confirms the fracture of particle chain occurs during the growth process of deposited particles.It captures the instantaneous process that a larger particle with micron size due to the coagulation of submicron particles fractures from main body of the particle chain for the first time.The analysis of migration behavior of a single submicron particle near electrode surface demonstrates the direct influence of drag force on the fracture of particle chain.This work is the first-time visualization of dynamic process and mechanism elucidation of particle re-entrainment at the micron level,and the findings will provide the theory support for the particle re-entrainment mechanism and bring inspires of enhancing capture efficiency of inhalable particle.

关 键 词：Inhalable particle Re-entrainment mechanism Operando observation LAB-ON-A-CHIP Capture efficiency 

分 类 号：X513[环境科学与工程—环境工程]