Tuning the rheology and microstructure of particle-laden fluid interfaces with Janus particles

Hypothesis: Particle-laden fluid interfaces are the central component of many natural and engineering systems. Understanding the mechanical properties and improving the stability of such interfaces are of great practical importance. Janus particles, a special class of heterogeneous colloids, might be used as an effective surface-active agent to control the assembly and interfacial rheology of particle-laden fluid interfaces. Experiments: Using a custom-built interfacial stress rheometer, we explore the effect of Janus particle additives on the interfacial rheology and microscopic structure of particle-laden fluid interfaces. Findings: We find that the addition of a small amount of platinum-polystyrene (Pt-PS) Janus particles within a monolayer of PS colloids (1:40 number ratio) can lead to more than an order-of-magnitude increase in surface moduli with enhanced elasticity, which improves the stability of the interface. This drastic change in interfacial rheology is associated with the formation of local particle clusters surrounding each Janus particle. We further explain the origin of local particle clusters by considering the interparticle interactions at the interface. Our experiments reveal the effect of local particle structures on the macroscopic rheological behaviors of particle monolayers and demonstrate a new way to tune the microstructure and mechanical properties of particle-laden fluid interfaces.

© This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/

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Work Title Tuning the rheology and microstructure of particle-laden fluid interfaces with Janus particles
Access
Open Access
Creators
  1. Yiming Qiao
  2. Xiaolei Ma
  3. Zhengyang Liu
  4. Michael A. Manno
  5. Nathan C. Keim
  6. Xiang Cheng
Keyword
  1. Interfacial rheology
  2. Janus particles
  3. Interparticle interactions
License CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives)
Work Type Article
Publisher
  1. Journal of Colloid and Interface Science
Publication Date July 15, 2022
Publisher Identifier (DOI)
  1. https://doi.org/10.1016/j.jcis.2022.03.041
Deposited August 02, 2024

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Version 1
published

  • Created
  • Added 2202.02288v2-1.pdf
  • Added Creator Yiming Qiao
  • Added Creator Xiaolei Ma
  • Added Creator Zhengyang Liu
  • Added Creator Michael A. Manno
  • Added Creator Nathan C. Keim
  • Added Creator Xiang Cheng
  • Published
  • Updated
  • Updated Keyword Show Changes
    Keyword
    • Interfacial rheology, Janus particles, Interparticle interactions