Results 231 to 240 of about 255,817 (279)
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Hydrocarbon Extraction into Surfactant Phase with Nonionic Surfactants. II. Model
Separation Science and Technology, 1985Abstract The solubilization kinetics of an extraction process of oil with an aqueous micellar solution of a nonionic surfactant has been modeled. The model is directly related to the phase diagram, allowing a simple form which explains the main effects. The theoretical results show the adsorption process of surfactant at the phase interfaces to provide
P. Neogi, Myungsoo Kim, Stig E. Friberg
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Hybrid Fluorocarbon–Hydrocarbon Surfactants: Synthesis and Colloidal Characterization
The Journal of Organic Chemistry, 2021Four double-tailed hybrid fluorocarbon-hydrocarbon (F-H) surfactants with a poly(ethylene glycol) (PEG) polar headgroup were synthesized. The hydrophobic scaffold consists of an amino acid core, onto which were grafted both fluorocarbon and hydrocarbon chains of different lengths.
Grousson, Emilie +4 more
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Hydrocarbon Surfactants for CO2: An Impossible Dream?
Australian Journal of Chemistry, 2007It used to be thought that hydrocarbon ionic surfactants were incompatible with dense liquid or supercritical CO2, and fluorination of the chains was necessary to achieve any appreciable solubility. Here it is shown that branching of pendant hydrocarbon chains, especially methylation of the tips, can lead to substantial solubility enhancements in CO2 ...
Eastoe, JG, Gold, S, Steytler, DC
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‘Emulsion locks’ for the containment of hydrocarbons during surfactant flushing
Journal of Environmental Sciences, 2020Reversible double water in oil in water (W/O/W) emulsions were developed to contain subsurface hydrocarbon spills during their remediation using surfactant flushing. Double emulsions were prepared by emulsifying CaCl2 solutions in canola oil, and subsequently by emulsifying the W/O emulsions in aqueous sodium alginate solutions. The formation of double
Kristine Lamont +2 more
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The Journal of Physical Chemistry, 1994
The pulsed field gradient NMR method has been used to determine self-diffusion coefficients of surfactant molecules, solubilized hydrocarbons, and D2O solvent in ternary N-alkyl-N,N-dimethylamine oxide/alkane/ D2O surfactant systems. In the micellar phase, diffusion is governed by hydrodynamic transport of the micelles, supplemented by an exchange of ...
Panitz, J.C. +3 more
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The pulsed field gradient NMR method has been used to determine self-diffusion coefficients of surfactant molecules, solubilized hydrocarbons, and D2O solvent in ternary N-alkyl-N,N-dimethylamine oxide/alkane/ D2O surfactant systems. In the micellar phase, diffusion is governed by hydrodynamic transport of the micelles, supplemented by an exchange of ...
Panitz, J.C. +3 more
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Solubilization of polycyclic aromatic hydrocarbons by perfluorinated surfactant micelles
Water Research, 2002Due to their chemical and thermal stability, perfluorinated surfactants (PFSs) are promising materials for the development of novel environmental remediation applications. This stability also leads to the persistence of PFS in the environment; therefore, their properties and behavior should be well understood.
Youn-Joo, An +2 more
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Modelling surfactant-enhanced remediation of polycyclic aromatic hydrocarbons
Environmental Modelling & Software, 1998Abstract Within the framework of a comprehensive investigation concerning the use of surfactants to enhance the in situ remediation of polycyclic aromatic hydrocarbons (PAH) contaminations in the subsurface, SMART (Streamtube Model for Advective and Reactive Transport), a multicomponent transport model, was developed to study the processes ...
Michael Finkel +2 more
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Miscibility of Hydrocarbon and Fluorocarbon Surfactants in Adsorbed Film and Micelle
Journal of Colloid and Interface Science, 2001We investigated the miscibility of nonionic hydrocarbon and fluorocarbon surfactants in the adsorbed film and the micelle by surface tension measurements of the aqueous solution. The combination of tetraethyleneglycol monodecyl ether (C10E4) and tetraethyleneglycol mono-1,1,7-trihydrododecafluoroheptyl ether (FC7E4) was chosen because they have the ...
Masumi, Villeneuve +4 more
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Effect of Surfactants on the Biodegradation of Petroleum Hydrocarbons
2003This paper focuses on the influence of Rokafenol N9-surfactant on the degree of biodegradation of diesel oil fraction (295–310°C). The diesel oil was a product of atmospheric distillation of Russian crude oil from the “Ural” oil field. It contained hydrocarbons characteristically hardly susceptible to biodegradation and of high toxicity.
Kazimierz Grabas +2 more
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A liquid CO2-compatible hydrocarbon surfactant: experiment and modelling
Physical Chemistry Chemical Physics, 2013Surfactants soluble in liquid CO2 are rare and knowledge on interfacial and self-assembly behaviour is fragmented. We found that polyoxyethylene (5) isooctylphenyl ether is interfacially active at the water-liquid CO2 interface. Water-liquid CO2 interfacial tension was measured at various surfactant concentrations at 50 bar and 283 K using the pendant ...
Banerjee, S. +3 more
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