Dynamic self-assembly, especially self-assembly under magnetic field, is vital not only for its marvelous phenomenon but also for its mechanisms. Revealing the underlying mechanisms is crucial for a deeper understanding of self-assembly. In this paper, several magnetic induced self-assembly experiments by using the mixed magnetic multiphase fluids comprised of silica microspheres were carried out. The relations of the strength of external magnetic field, the inverse magnetorheological effect, and the structures of self-assembled particles were investigated. In addition, a momentum-exchanged immersed boundary-based lattice Boltzmann method (MEIB-LBM) for modeling multi-physical coupling multiphase flows was employed to numerically study the magnetic induced self-assembly process in detail. The present work showed that the external magnetic field can be used to control the form of self-assembly of nonmagnetic microparticles in a chain-like structure, and the self-assembly process can be classified into four stages with magnetic hysteresis, magnetization of nonmagnetic microparticles, self-assembly in chain-like structures, and the stable chain state. The combination of experimental and numerical results could offer a method to control the self-assembled nonmagnetic microparticles, which can provide the technical and theoretical support for the design and fabrication of micro/nanomaterials.
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April 2018
Research Article|
March 14 2018
Self-assembly of silica microparticles in magnetic multiphase flows: Experiment and simulation
Special Collection:
Papers Selected from the Seventh International Symposium on Physics of Fluids
Xiang Li
;
Xiang Li
College of Engineering, Shantou University
, 243 Daxue Road, Shantou, Guangdong 515063, China
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Xiao-Dong Niu;
Xiao-Dong Niu
a)
College of Engineering, Shantou University
, 243 Daxue Road, Shantou, Guangdong 515063, China
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You Li
;
You Li
College of Engineering, Shantou University
, 243 Daxue Road, Shantou, Guangdong 515063, China
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Mu-Feng Chen
Mu-Feng Chen
College of Engineering, Shantou University
, 243 Daxue Road, Shantou, Guangdong 515063, China
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a)
Author to whom correspondence should be addressed: xdniu@stu.edu.cn.
Physics of Fluids 30, 040905 (2018)
Article history
Received:
October 24 2017
Accepted:
January 25 2018
Citation
Xiang Li, Xiao-Dong Niu, You Li, Mu-Feng Chen; Self-assembly of silica microparticles in magnetic multiphase flows: Experiment and simulation. Physics of Fluids 1 April 2018; 30 (4): 040905. https://doi.org/10.1063/1.5010292
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