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Microflow of nanoemulsion threads in surfactant solutions
Thai Dinh1, Yixuan Xu2, Thomas G Mason3,4
1Department of Mechanical Engineering, Stony Brook University, Stony Brook, New York 11794, USA.
Physical Review. E
|February 17, 2023
Summary
We studied nanoemulsion flow in sodium dodecyl sulfate (SDS) solutions using microfluidics. Complex flows like buckling were observed, revealing relationships between flow types and SDS concentration.
Area of Science:
- Colloid and Surface Science
- Fluid Dynamics
- Microfluidics
Background:
- Nanoemulsions are crucial in various industries.
- Understanding their behavior in microfluidic devices is key for process optimization.
- Sodium dodecyl sulfate (SDS) is a common surfactant affecting emulsion stability and flow.
Purpose of the Study:
- To experimentally investigate microfluidic flow of oil-in-water nanoemulsions.
- To explore nanoemulsion thread behavior in varying sodium dodecyl sulfate (SDS) concentrations and flow rates.
- To analyze complex flow phenomena and their underlying dynamics.
Main Methods:
- Utilized a coaxial microfluidic device for nanoemulsion injection.
- Employed two high-speed cameras for simultaneous top and side view imaging.
- Analyzed core-annular, gravitational, inertial, and buckling thread flows.
Main Results:
- Observed diverse flow regimes from core-annular to complex thread behaviors.
- Developed a methodology linking core-annular and gravitational flows at low rates.
- Characterized off-axis displacements, bending, and buckling dynamics under varying SDS concentrations.
Conclusions:
- Microfluidic flow of nanoemulsions is highly dependent on SDS concentration and flow rate.
- Complex flow phenomena, including buckling, are driven by inertial, gravitational, and osmotic effects.
- The study provides insights into controlling nanoemulsion thread dynamics in microfluidic systems.
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