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Rheological behavior of SiO2 NP/CTAB/PPA wormlike micelles in alcohol/water mixture

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Abstract

This study explores the effect of alcohol on the rheological behavior of SiO2 nanoparticle (NP) in cetyltrimethylammonium bromide (CTAB)/potassium hydrogen phthalate (PPA) wormlike micelles (WLMs). No previous literature explored the effect of chemical stresses on NP-mediated WLMs. The addition of 0.05 wt% NPs increased the zero-shear viscosity of 30 mM CTAB/20 mM PPA WLMs by 30%. A further increase in SiO2 NPs disrupted the micellar structure, resulting in reduced viscosity. The optimum SiO2 NP content increased from ~ 0.05 wt% to ~ 0.4 wt% as the CTAB and PPA concentrations increased from 30 mM CTAB/20 mM PPA to 90 mM CTAB/60 mM PPA. The effect of ethanol and 1-hexanol on WLMs composed of 0.05 wt% SiO2 NP/30 mM CTAB/20 mM PPA was assessed. The NPs enhanced the shear viscosity of ethanol/WLM systems. Notably, at ethanol concentrations of 0.14 wt%, 0.60 wt% and 1.40 wt%, the zero-shear viscosity increased by approximately 60%, 100%, and 25%, respectively. SiO2 NPs acted as junction points, facilitating the crosslinking among shorter micelles and improving micellar entanglement. Conversely, SiO2 NPs had little impact on 1-hexanol/WLM systems owing to the strong interaction between WLMs and 1-hexanol at the micellar interface.

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Acknowledgements

The authors would like to acknowledge the Natural Sciences and Engineering Council of Canada (NSERC) for their financial support (Grants No. RGPIN-2020-03880 and RGPIN-2017-03783). Ms. H. Han would like to acknowledge Alberta Graduate Excellence Scholarship (AGES)-International.

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Correspondence to Maen M. Husein or Giovanniantonio Natale.

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Han, H., Husein, M.M. & Natale, G. Rheological behavior of SiO2 NP/CTAB/PPA wormlike micelles in alcohol/water mixture. Rheol Acta 63, 157–166 (2024). https://doi.org/10.1007/s00397-024-01432-4

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  • DOI: https://doi.org/10.1007/s00397-024-01432-4

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