Surfactant-based gels

Trickett, Kieran; Eastoe, Julian

doi:10.1016/j.cis.2008.08.009

Cited by 112 publications

(106 citation statements)

References 107 publications

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“…Trickett and Eastoe (2008) observed only a range of surfactant concentrations display this viscosity enhancement phenomenon and the critical temperature where the turning point exists is a function of surfactant concentration and shear rate. Thus, in conclusion, as the temperature increases, micelles elongate and entangle into chains until the competing effect of temperature surpasses the entanglement process and initiates micellar branching.…”

Section: Effect Of Temperaturementioning

confidence: 99%

“…As the surfactant concentration increases, the micelles are more prone to overlap and entangle into a transient network due to a larger presence of surfactant molecules in the solution (Collura et al 2001). In addition, shear thinning at higher salt concentrations suggests disentanglement of the system and alignment of the wormlike micelles under shear flow (Acharya and Kunieda 2006;Shchipunov and Hoffmann 2000;Trickett and Eastoe 2008). This alignment causes viscosity degradation since the micellar structure orients in a way that minimizes resistance to flow, causing the solution to move as a single object (Lin et al 2001).…”

Section: Effect Of Shear Ratementioning

confidence: 99%

“…Researchers have noted micelles grow and entangle before the inflection point due to the minimization of free energy, but after the inflection point, the onset of micellar branching occurs leading to a decrease in viscosity Petroleum Science (Calabrese et al 2015;Koehler et al 2000;Trickett and Eastoe 2008). Trickett and Eastoe (2008) observed only a range of surfactant concentrations display this viscosity enhancement phenomenon and the critical temperature where the turning point exists is a function of surfactant concentration and shear rate.…”

Section: Effect Of Temperaturementioning

confidence: 99%

“…The Cl -ions shrink the double layer and screen electrostatic repulsion around each head group, allowing surfactant molecules to aggregate and gradually transform into various micellar structures. To attain viscoelasticity, a higher concentration is required if using a weak, nonbinding salt, such as NaCl, since this type of salt shields the surface of the micelles unlike strong hydrotropic salts, for instance sodium salicylate and sodium tosylate, that penetrate into the micellar structure initiating viscoelasticity at lower salt concentrations (Trickett and Eastoe 2008;Hoffmann 1994;Calabrese et al 2015). To define, hydrotropic salts are amphiphilic compounds that cannot form aggregates, like micelles, yet can solubilize organic compounds in water (Hill et al 2014).…”

Section: Effects Of Salinity and Surfactant Concentrationmentioning

confidence: 99%

“…Microstructural aggregation and morphology of surfactant micelles impart changes in macroscopic behavior and flow properties of the surfactant solution under certain conditions (Gaudino et al 2015;Schramm 2000;Trickett and Eastoe 2008;van Zanten 2011). In general, the packing parameter classifies the structure of the micelles under four divisions; spherical, cylindrical/wormlike, vesicles, or lamellar micelles (Lequeux 1996).…”

Section: Introductionmentioning

confidence: 99%

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A systematic rheological study of alkyl amine surfactants for fluid mobility control in hydrocarbon reservoirs

2018

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The basis of this study is to identify the versatility of N,N,N 0 -trimethyl-N 0 -tallow-1,3-diaminopropane (DTTM) surfactant in high saline environments. The surfactant was examined with sodium chloride, NaCl, to understand how triggers such as salt, pH, temperature, and surfactant concentration influences the viscoelastic response of the surfactant solution. The DTTM surfactant and salt (NaCl) concentrations used in steady-state shear viscosity analysis range from 0.2 wt% to 2 wt% and 5 wt% to 25 wt%, respectively. Along with DTTM results, three similar chemical structures are investigated to understand how viscosity changes with alterations in tail and head group composition. It was found that DTTM surfactant has the capability of transitioning from a foam-bearing to viscoelastic state at low surfactant concentrations under moderate to high saline conditions. A longer tail length promotes viscoelasticity and shear-thinning behavior. Terminals consisting of hydroxides or ethoxylates have a lower viscosity than that of methyl terminals. A head group consisting of two nitrogen atoms has a higher viscosity than those containing one nitrogen atom. The rheological characterization of DTTM presented in this paper is part of a larger study in determining the capability of this surfactant to foam CO 2 for improving mobility control in CO 2 enhanced oil recovery in high saline oil formations.

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Section: Effect Of Temperaturementioning

confidence: 99%

Section: Effect Of Shear Ratementioning

confidence: 99%

Section: Effect Of Temperaturementioning

confidence: 99%

Section: Effects Of Salinity and Surfactant Concentrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A systematic rheological study of alkyl amine surfactants for fluid mobility control in hydrocarbon reservoirs

2018

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Interconvertible Self‐Assembly and Rheological Properties of Planar Bilayers and Vesicle Gels in Anionic/Nonionic (CF/CH) Surfactant Solutions

Dong

et al. 2013

Chemistry An Asian Journal

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The surface and bulk properties of aqueous mixtures of nonionic tetraethylene glycol monododecyl ether (C12EO4) and anionic perfluorolauric acid (PFLA) were studied. These mixtures exhibited pronounced synergistic effects in terms of their mixed micellization and rheological properties. Only one type of mixed micelle is formed in dilute mixed solutions. At low PFLA content, with increasing the total surfactant concentration, short thread-like micelles grow to form larger discs. On increasing the amount of PFLA, owing to the fact that the fluctuant planar bilayers of nonionic C12EO4 become charged, vesicle gels that are comprised of densely packed unilamellar and multilamellar vesicles spontaneously form, in which the fluorocarbon chains in the bilayers are in a fluid state at room temperature. The elastic properties and the yield stress of the lamellar solutions largely increase upon the addition of small amounts of PFLA and they then pass through a maximum at a saturation of effective membrane charge density. Interestingly, increasing the pH value of the gels causes a backward transition from stiff vesicles to flexible planar bilayers. On increasing the amount of NaOH, the bilayers exhibit greater flexibility, owing to the decrease in membrane charges, along with a large decrease in the solution viscosity and their elastic properties. The combination of strong stability of the vesicle gels with the interconvertible transition of bilayers and vesicles is expected to be of practical use for controlled drug delivery and release.

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Lanthanide‐Containing Photoluminescent Materials: From Hybrid Hydrogel to Inorganic Nanotubes

Qiao

Lin

Zhang

et al. 2011

Chemistry A European J

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Functional photoluminescent materials are emerging as a fascinating subject with versatile applicability. In this work, luminescent organic-inorganic hybrid hydrogels are facilely designed through supramolecular self-assembly of sodium cholate, and lanthanide ions such as Eu(3+), Tb(3+), and Eu(3+)/Tb(3+). Fluorescence microscopy and TEM visualization demonstrates the existence of spontaneously self-assembled nanofibers and 3D networks in hybrid hydrogel. Photoluminescence enhancement of lanthanide ions is realized through coordination with cholate and co-assembly into 1D nanofibers, which can successfully shield the Eu(3+) from being quenched by water. The photoluminescence emission intensity of a hybrid hydrogel exhibits strong dependence on europium/cholate molar ratio, with maximum emission appearing at a stoichiometry of 1:3. Furthermore, the emission color of a lanthanide-cholate hydrogel can be tuned by utilizing different lanthanide ions or co-doping ions. Moreover, photoluminescent lanthanide oxysulfide inorganic nanotubes are synthesized by means of a self-templating approach based on lanthanide-cholate supramolecular hydrogels. To the best of our knowledge, this is the first time that the lanthanide oxysulfide inorganic nanotubes are prepared in solution under mild conditions.

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Surfactant-based gels

Cited by 112 publications

References 107 publications

A systematic rheological study of alkyl amine surfactants for fluid mobility control in hydrocarbon reservoirs

A systematic rheological study of alkyl amine surfactants for fluid mobility control in hydrocarbon reservoirs

Interconvertible Self‐Assembly and Rheological Properties of Planar Bilayers and Vesicle Gels in Anionic/Nonionic (CF/CH) Surfactant Solutions

Lanthanide‐Containing Photoluminescent Materials: From Hybrid Hydrogel to Inorganic Nanotubes

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