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Wetting behavior of polyoxyethylene-type nonionic surfactant with multi-branched chains on solid surfaces.
Risa Kawai1,2, Nana Tsutsui1, Kotoha Ueno1
1Department of Materials Science & Engineering, National Institute of Technology, Suzuka College, Shiroko-cho, Suzuka, Mie, 510-0294, Japan.
Branched surfactants significantly enhance surface wetting and reduce surface tension compared to linear types. Their unique structure promotes rapid spreading on various surfaces, improving wettability for diverse applications.
Area of Science:
- Surface Chemistry
- Materials Science
- Colloid Science
Background:
- Surfactant wetting is crucial for applications like cleaning, coatings, and electronics.
- Understanding surfactant structure-property relationships is key to optimizing performance.
Purpose of the Study:
- Investigate the interfacial properties and wettability of a branched nonionic surfactant.
- Compare its performance against linear single-chain and double-chain surfactants.
- Elucidate the role of branched hydrophobic chains in surface wetting.
Main Methods:
- Systematic investigation of interfacial properties.
- Surface tension measurements.
- Contact angle measurements on various substrates.
- Analysis of wetting free energy.
Main Results:
- Branched surfactant (bC7-bC9EO15.8) achieved low surface tension (26.3-27.0 mN m⁻¹) and high surface activity.
- Rapid spreading on hydrophobic surfaces and lower contact angles on glass compared to linear surfactants.
- Highest wetting free energy observed across all tested substrates.
- Higher critical micelle concentration (CMC) for branched surfactant.
Conclusions:
- Methyl-rich branched hydrophobic chains significantly enhance surfactant wettability.
- Surfactant adsorption and reorientation at the solid/liquid interface drive improved wetting.
- Branched surfactants offer superior performance for wetting applications regardless of surface polarity.
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