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Colloid thermophoresis in surfactant solutions: Probing colloid-solvent interactions through microscale experiments
Di Pu1, Amirreza Panahi1, Giovanniantonio Natale1
1Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta T2N 1N4, Canada.
The Journal of Chemical Physics
|September 9, 2024
Summary
Surfactants significantly alter silica bead thermophoresis by changing surface interactions. Nonionic surfactants rely on silanol group dissociation, while ionic surfactants involve surfactant adsorption.
Area of Science:
- Colloid and interface science
- Physical chemistry
- Nanotechnology
Background:
- Thermophoresis is sensitive to colloid-solvent interactions, crucial for nano/microscale manipulation.
- Surfactants tailor particle surface chemistry and interfacial interactions.
- Microscopic mechanisms of thermophoresis in surfactant solutions are complex and poorly understood.
Purpose of the Study:
- To elucidate the fundamental mechanisms of surfactant effects on silica bead thermophoresis.
- To investigate thermophoretic behavior in ionic and nonionic surfactant solutions.
- To provide a mechanistic picture of surfactant-governed interfacial interactions.
Main Methods:
- Investigated thermophoretic behavior of silica beads in ionic and nonionic surfactant solutions.
- Conducted experiments at various background temperatures.
- Employed mode-coupling analysis of electrophoretic and thermophoretic data.
Main Results:
- Silica thermophoresis in nonionic surfactants is driven by silanol group dissociation at interfaces.
- Silica thermophoresis in ionic surfactants is primarily driven by ionic surfactant adsorption onto the silica surface.
- A complete mechanistic picture of surfactant effects on interfacial interactions was established.
Conclusions:
- The study clarifies the distinct roles of nonionic and ionic surfactants in silica thermophoresis.
- Understanding these mechanisms is key for advanced colloid manipulation and characterization.
- Mode-coupling analysis effectively reveals underlying thermophoretic mechanisms.
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