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Structure Identification of Adsorbed Anionic-Nonionic Binary Surfactant Layers Based on Interfacial Shear Rheology
Ourania Oikonomidou1, Margaritis Kostoglou1, Thodoris Karapantsios1
1Department of Chemical Technology and Industrial Chemistry, Faculty of Chemistry, Aristotle University of Thessaloniki, University Box 116, 541 24 Thessaloniki, Greece.
Molecules (Basel, Switzerland)
|March 11, 2023
Summary
This study reveals how nonionic surfactants can displace sodium oleate in flotation, optimizing mineral separation. Understanding these interfacial dynamics enhances flotation efficiency for valuable mineral recovery.
Area of Science:
- Mineral processing and surface chemistry.
- Application of flotation technology in mining.
- Surfactant science and interfacial phenomena.
Background:
- Anionic sodium oleate (NaOl) and nonionic surfactants are crucial in magnesite flotation.
- These surfactants modify particle hydrophobicity and air-liquid interface properties.
- Current understanding relies on surface tension, which doesn't fully capture dynamic flotation conditions.
Purpose of the Study:
- To investigate the interfacial rheology of NaOl and nonionic surfactant mixtures.
- To understand the dynamic arrangement and viscoelastic properties of adsorbed surfactants under shear.
- To explore how nonionic surfactant structure influences NaOl displacement at the air-liquid interface.
Main Methods:
- Utilizing interfacial shear rheology to study surfactant mixtures.
- Analyzing adsorption kinetics and intermolecular forces at the air-liquid interface.
- Complementing rheological data with surface tension isotherm measurements.
Main Results:
- Nonionic surfactants demonstrate a tendency to displace NaOl from the air-liquid interface.
- The concentration required for NaOl displacement is dependent on the nonionic surfactant's hydrophilic chain length and hydrophobic group geometry.
- Surface tension data supports the observed interfacial displacement phenomena.
Conclusions:
- Interfacial rheology provides deeper insights into dynamic surfactant behavior during flotation.
- The structural characteristics of nonionic surfactants are key determinants of their displacement efficiency.
- This research offers a pathway to optimize flotation reagent design for improved mineral recovery.
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