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Nanoparticle adsorption dynamics at fluid interfaces
Xiaoqing Hua1, Joelle Frechette, Michael A Bevan
1Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218, USA. mabevan@jhu.edu jfrechette@jhu.edu.
Soft Matter
|May 3, 2018
Summary
We developed a model for nanoparticle adsorption dynamics at fluid interfaces, crucial for emulsions and 2D materials. The model combines established equations with a new wetting equation of state for accurate predictions.
Area of Science:
- Physical Chemistry
- Materials Science
- Colloid Science
Background:
- Dynamic adsorption of nanoparticles (NPs) at fluid interfaces is key for emulsion stabilization and creating 2D NP-based materials.
- Existing models for surfactant adsorption dynamics do not fully capture NP behavior due to unique NP properties.
Purpose of the Study:
- To adapt and validate the Ward-Tordai equations and Frumkin adsorption isotherm for modeling nanoparticle adsorption dynamics.
- To incorporate a wetting equation of state (EOS) to accurately describe dynamic interfacial tension during NP adsorption.
- To extend the model for competitive adsorption scenarios involving NPs and other surface-active species.
Main Methods:
- Applied the Ward-Tordai equations, typically used for surfactants, to model diffusion-limited nanoparticle adsorption.
- Integrated a Frumkin adsorption isotherm to describe NP interactions at the interface.
- Introduced a novel wetting equation of state (EOS) to account for NP-specific interfacial behavior at oil-water interfaces.
Main Results:
- The combined model accurately describes NP adsorption dynamics for area fractions below 0.3.
- Discrepancies at higher area fractions suggest effects of NP polydispersity or interfacial reorganization.
- The model successfully predicts competitive adsorption between NPs and surface-active species.
Conclusions:
- The adapted Ward-Tordai equations with a Frumkin isotherm and a wetting EOS provide a robust framework for modeling NP adsorption dynamics.
- This model advances the understanding of NP interfacial behavior, with implications for material design and emulsion technology.
- The model's extension to competitive adsorption opens new avenues for controlling interfacial properties.
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