Ionic surfactant adsorption on TiO2, Al2O3 and carbon nanoparticles: physicochemical control of charge, colloidal stability and n-hexane/water interfacial tension; Journal of Molecular Liquids; Vol. 457
| Parent link: | Journal of Molecular Liquids.— .— Amsterdam: Elsevier Science Publishing Company Inc. Vol. 457.— 2026.— Article number 129723, 19 p. |
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| Other Authors: | , , , , , |
| Summary: | Title screen Ionic surfactant adsorption on oxide and carbon nanoparticles was studied as a route to regulate surface charge, colloidal state and oil/water interfacial tension. The adsorption of cationic cetyltrimethylammonium bromide (CTAB) and anionic sodium dodecyl sulfate (SDS) on plasma-synthesized titanium-oxide (Ti O), aluminium-oxide (Al O) and carbon nanoparticles (C-NPs) in aqueous KCl solutions over broad pH and ionic-strength ranges was studied. Dynamic and electrophoretic light scattering, Fourier transform infrared spectroscopy, X-ray fluorescence, electron microscopy, solution-depletion adsorption and thermal analysis were used to relate surfactant uptake and retention to changes in ζ-potential, aggregation and particle redispersion, and spinning-drop tensiometry was used to measure n-hexane/water interfacial tension. CTAB reversed the negative charge of Ti O and carbon particles and produced strongly positive ζ-potentials, consistent with adsorption of cationic surfactant species on oxide and carbon surfaces. SDS adsorption reversed the positive charge of Al O and produced negative ζ-potentials, consistent with the formation of an anionic surfactant layer. The colloidal response depended strongly on total ionic strength and pH, with near-neutral pH (6) corresponding to comparatively small aggregate sizes and high-magnitude ζ-potentials for the studied nanoparticle–surfactant combinations. After washing and redispersion in water, surfactant-modified particles exhibited apparent interfacial activity at the n-hexane/water interface, with CTAB-modified C-NPs showing the largest interfacial tension decrease, down to ∼22 mN/m. The results provide a physicochemical basis for understanding how ionic surfactant adsorption controls charge regulation, aggregation and model oil/water interfacial behaviour of oxide and carbon nanoparticles Текстовый файл AM_Agreement |
| Language: | English |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://doi.org/10.1016/j.molliq.2026.129723 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=687106 |
| Summary: | Title screen Ionic surfactant adsorption on oxide and carbon nanoparticles was studied as a route to regulate surface charge, colloidal state and oil/water interfacial tension. The adsorption of cationic cetyltrimethylammonium bromide (CTAB) and anionic sodium dodecyl sulfate (SDS) on plasma-synthesized titanium-oxide (Ti O), aluminium-oxide (Al O) and carbon nanoparticles (C-NPs) in aqueous KCl solutions over broad pH and ionic-strength ranges was studied. Dynamic and electrophoretic light scattering, Fourier transform infrared spectroscopy, X-ray fluorescence, electron microscopy, solution-depletion adsorption and thermal analysis were used to relate surfactant uptake and retention to changes in ζ-potential, aggregation and particle redispersion, and spinning-drop tensiometry was used to measure n-hexane/water interfacial tension. CTAB reversed the negative charge of Ti O and carbon particles and produced strongly positive ζ-potentials, consistent with adsorption of cationic surfactant species on oxide and carbon surfaces. SDS adsorption reversed the positive charge of Al O and produced negative ζ-potentials, consistent with the formation of an anionic surfactant layer. The colloidal response depended strongly on total ionic strength and pH, with near-neutral pH (6) corresponding to comparatively small aggregate sizes and high-magnitude ζ-potentials for the studied nanoparticle–surfactant combinations. After washing and redispersion in water, surfactant-modified particles exhibited apparent interfacial activity at the n-hexane/water interface, with CTAB-modified C-NPs showing the largest interfacial tension decrease, down to ∼22 mN/m. The results provide a physicochemical basis for understanding how ionic surfactant adsorption controls charge regulation, aggregation and model oil/water interfacial behaviour of oxide and carbon nanoparticles Текстовый файл AM_Agreement |
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| DOI: | 10.1016/j.molliq.2026.129723 |