Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 324, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2020.114675
Keywords
SiO2 nanoparticles; Wormlike micelles; Viscoelasticity; Micelle-nanoparticle junction; Hydrophobic effect
Funding
- National Natural Science Foundation of China [51974344]
- Natural Science Foundation of Shandong Provincial [ZR2019MEE077]
- Fundamental Research Funds for the Central Universities [19CX02064A]
- Opening Fund of Shandong Key Laboratory of Oilfield Chemistry
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The effects of SiO2 nanoparticles on the viscoelasticity of WLMs solutions were investigated, showing that micelle-nanoparticle junctions increased the contour length of WLMs to facilitate viscoelasticity. The experiments explored the impact of SiO2 NPs on zero-shear viscosity and flow activation energies of WLMs with different surfactant alkyl chain lengths. The viscoelasticity of WLMs/NPs mixture was found to be related to the hydrophobic effect between the nanoparticles and surfactant molecules in the micelle-nanoparticle junction.
The effects of both hydrophilic and hydrophobic SiO2 nanoparticles (NPs) on the viscoelasticity of stearyltrimethylammonium bromide/sodium salicylate wormlike micelles (WLMs) solutions were investigated. The micelle-nanoparticle junctions obviously increased the contour length L-c of the WLMs to facilitate the viscoelasticity of WLMs solution, which could be reflected by cryo-TEM images and Maxwell model. The effects of SiO2 NPs on the zero-shear viscosity and the flow activation energies of WLMs with different surfactant alkyl chain lengths were explored in the controlled experiments. It was found that the viscoelasticity of WLMs/NPs mixture was associated with the strength of the hydrophobic effect between the SiO2 NPs and surfactant molecules in the micelle-nanoparticle junction. The number densities of micelle-nanoparticle junction in hydrophilic and hydrophobic SiO2 NPs systems were calculated by the mathematical model to confirm our proposed hypothesis. (C) 2020 Elsevier B.V. All rights reserved.
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