Arrested Chain Growth During Magnetic Directed Particle Assembly in Yield Stress Matrix Fluids
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McKinley_Arrested chain.pdf
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3.1 MB
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Author(s)
Rich, Jason P.
McKinley, Gareth H
Doyle, Patrick S
Date Issued
February 2012
Journal
Langmuir
Publisher
American Chemical Society
Citation
Rich, Jason P., Gareth H. McKinley, and Patrick S. Doyle. Arrested Chain Growth During Magnetic Directed Particle Assembly in Yield Stress Matrix Fluids. Langmuir 28, no. 8 (February 28, 2012): 3683-3689.
Version
Author's final manuscript
Abstract
The process of assembling particles into organized functional structures is influenced by the rheological properties of the matrix fluid in which the assembly takes place. Therefore, tuning these properties represents a viable and as yet unexplored approach for controlling particle assembly. In this Letter, we examine the effect of the matrix fluid yield stress on the directed assembly of polarizable particles into linear chains under a uniform external magnetic field. Using particle-level simulations with a simple yield stress model, we find that chain growth follows the same trajectory as in Newtonian matrix fluids up to a critical time that depends on the balance between the yield stress and the strength of magnetic interactions between particles; subsequently, the system undergoes structural arrest. Appropriate dimensionless groups for characterizing the arresting behavior are determined and relationships between these groups and the resulting structural properties are presented. Since field-induced structures can be indefinitely stabilized by the matrix fluid yield stress and “frozen” into place as desired, this approach may facilitate the assembly of more complex and sophisticated structures.
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Hatsopoulos Microfluids Laboratory
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1021/la204240f
