Journal
SOFT MATTER
Volume 14, Issue 19, Pages 3818-3828Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8sm00273h
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Funding
- National Science Foundation [CBET-1510671, CBET-1436482]
- American Chemical Society Petroleum Research Fund [51803-ND5]
- Air Force Office of Scientific Research [FA9550-12-1-0090]
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Understanding the dynamic adsorption of nanoparticles (NPs) at fluid interfaces is important for stabilizing emulsions and for the preparation of 2D NP-based materials. Here we show that the Ward-Tordai equations commonly employed to describe the dynamics of surfactant adsorption at a fluid interface combined with a Frumkin adsorption isotherm can be employed to model the diffusion-limited adsorption of NPs onto a fluid interface. In contrast to surfactants, an additional wetting equation of state (EOS) must be incorporated to characterize the dynamic interfacial tension during the adsorption of NPs to the oil-water interface. Our results show agreement between the model and experiments with NP area fractions <0.3. Slower dynamics are observed at larger area fractions, which are speculated to arise from polydispersity or re-organization at the interface. We show the model can be extended to the competitive adsorption between the NPs and a surface active species.
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