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Solvents, in which ionic surfactants do not affect the zeta potential
Marek Kosmulski1, Piotr Próchniak, Jarl B Rosenholm
1Department of Physical Chemistry, Abo Akademi University, Abo, Finland. mkosmuls@hektor.umcs.lublin.pl
Journal of Colloid and Interface Science
|November 10, 2009
Summary
The study shows that solvent polarity impacts how the anionic surfactant, DOSS, adsorbs onto titania and alumina particles. Higher polarity solvents like methanol led to significant zeta potential changes, unlike intermediate polarity alcohols.
Area of Science:
- Surface Chemistry
- Colloid Science
- Materials Science
Background:
- Understanding surfactant adsorption is crucial for controlling nanoparticle behavior in dispersions.
- Solvent properties significantly influence interfacial phenomena and particle interactions.
Purpose of the Study:
- To investigate the effect of solvent polarity on the adsorption of DOSS (anionic surfactant) onto titania and alumina.
- To correlate changes in zeta potential with varying solvent polarities.
Main Methods:
- Electroacoustic method was employed to study adsorption.
- Zeta potential measurements were conducted on titania and alumina dispersions.
- Experiments were performed in solvents of varying polarities: methanol, hydrocarbons, and intermediate polarity alcohols (1-propanol, 2-propanol, 1-butanol).
Main Results:
- DOSS significantly altered the zeta potential of titania and alumina in low-polarity hydrocarbons and high-polarity methanol.
- The impact of DOSS on zeta potential was less pronounced in intermediate polarity solvents like propanols and butanol.
- This indicates a polarity-dependent adsorption mechanism of the surfactant.
Conclusions:
- Solvent polarity is a critical factor governing the adsorption behavior of DOSS on oxide surfaces.
- The electroacoustic method effectively quantifies surfactant-surface interactions influenced by solvent properties.
- Tailoring solvent polarity can modulate surfactant efficacy in controlling nanoparticle surface charge.
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