Mixed micelles of sodium perfluorooctanoate and imidazolium based ionic liquids in aqueous solution: A SANS and Tensiometric study

Padsala, Shailesh; Patel, Vipul M.; Ray, Debes; Aswal, Vinod K.; Bahadur, Pratap

doi:10.1016/j.molliq.2020.114558

Cited by 9 publications

(5 citation statements)

References 59 publications

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“…SANS studies on fluorinated surfactant micelles in aqueous solutions in the presence of additives are very limited. A few SANS studies are available on mixed micelles of fluorinated surfactants and hydrogenated surfactants ,− or imidazolium-based ionic liquids and on PFOA micelles in the presence of salt: , in NH 4 Cl:NH 4 OH buffer solutions with pH 8.8 and an ionic strength of 0.1 (units not mentioned in that paper) and in 0.5 M NH 4 Cl.…”

Section: Resultsmentioning

confidence: 99%

“…While the results presented in that paper provided indirect evidence on urea effects on PFOA micelles, direct structural information on PFOA micelles in aqueous solutions in the presence of urea is not available in the literature. In general, nanostructure characterization studies of fluorinated surfactant micelles in water are limited. − …”

Section: Introductionmentioning

confidence: 99%

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Structure and Interactions in Perfluorooctanoate Micellar Solutions Revealed by Small-Angle Neutron Scattering and Molecular Dynamics Simulations Studies: Effect of Urea

et al. 2021

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The self-assembly of surfactants in aqueous solution can be modulated by the presence of additives including urea, which is a well-known protein denaturant and also present in physiological fluids and agricultural runoff. This study addresses the effects of urea on the structure of micelles formed in water by the fluorinated surfactant perfluoro-n-octanoic acid ammonium salt (PFOA). Analysis of small-angle neutron scattering (SANS) experiments and atomistic molecular dynamics (MD) simulations provide consensus strong evidence for the direct mechanism of urea action on micellization: urea helps solvate the hydrophobic micelle core by localizing at the surface of the core in the place of some water molecules. Consequently, urea decreases electrostatic interactions at the micelle shell, changes the micelle shape from prolate ellipsoid to sphere, and decreases the number of surfactant molecules associating in a micelle. These findings inform the interactions and behavior of surface active per-and polyfluoroalkyl substances (PFAS) released in the aqueous environment and biota.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structure and Interactions in Perfluorooctanoate Micellar Solutions Revealed by Small-Angle Neutron Scattering and Molecular Dynamics Simulations Studies: Effect of Urea

et al. 2021

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“…SANS measurements of aqueous PFOA solutions in the absence and presence of PEO were performed on the NG-B 30 m SANS instrument at the Center for Neutron Research (NCNR), National Institute of Standards and Technology (NIST), Gaithersburg, MD (refer to the SI for information on SANS data collection and reduction). SANS has been widely used to determine the size and structure of surfactant micelles. ,− …”

Section: Methodsmentioning

confidence: 99%

Binding of Perfluorooctanoate to Poly(ethylene oxide)

et al. 2022

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To inform the design of polymer-based adsorbent materials for sequestration of per- and polyfluoroalkyl substances (PFAS) from aqueous solution, we report here on the critical aggregation concentration (CAC), shape, size, composition, and interactions of assemblies formed in water between perfluorooctanoic acid ammonium salt (PFOA) and the nonionic polymer poly(ethylene oxide) (PEO), obtained from complementary experiments (conductivity, surface tension, pyrene fluorescence, viscosity, and small-angle neutron scattering (SANS)) and atomistic molecular dynamics (MD) simulations. PEO–PFAS binding commences at concentrations lower than the PFOA critical micelle concentration (CMC) and is driven by PEO localizing on the micelle surface and shielding the fluorocarbon parts of PFOA from contact with water. PFOA + PEO mixed micelles have a 10% higher association number and are 40% more elongated compared to polymer-free PFOA micelles. This is the first investigation on the structure of polymer + fluorocarbon surfactant mixed micelles and contributes fundamental insights into the association of water-soluble polymers with PFAS surfactants.

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“…This number can be affected by temperature, pH, type of surfactant, the addition of either electrolytes or organic compounds, etc. Several methods have been reported for the determination of the micellar aggregation number, including light-scattering [59], fluorescence [35,60] transmission electron microscopy [61,62], isothermal titration calorimetry [63,64], small-angle neutron scattering (SANS) [65][66][67], among others.…”

Section: Aggregation Numbermentioning

confidence: 99%

Gemini and Bicephalous Surfactants: A Review on Their Synthesis, Micelle Formation, and Uses

Guerrero-Hernández¹,

Meléndez‐Ortiz²,

Cortez-Mazatan³

et al. 2022

IJMS

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The use of surfactants in polymerization reactions is particularly important, mainly in emulsion polymerizations. Further, micelles from biocompatible surfactants find use in pharmaceutical dosage forms. This paper reviews recent developments in the synthesis of novel gemini and bicephalous surfactants, micelle formation, and their applications in polymer and nanoparticle synthesis, oil recovery, catalysis, corrosion, protein binding, and biomedical area, particularly in drug delivery.

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Mixed micelles of sodium perfluorooctanoate and imidazolium based ionic liquids in aqueous solution: A SANS and Tensiometric study

Cited by 9 publications

References 59 publications

Structure and Interactions in Perfluorooctanoate Micellar Solutions Revealed by Small-Angle Neutron Scattering and Molecular Dynamics Simulations Studies: Effect of Urea

Structure and Interactions in Perfluorooctanoate Micellar Solutions Revealed by Small-Angle Neutron Scattering and Molecular Dynamics Simulations Studies: Effect of Urea

Binding of Perfluorooctanoate to Poly(ethylene oxide)

Gemini and Bicephalous Surfactants: A Review on Their Synthesis, Micelle Formation, and Uses

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