A Rheological Approach to Viscoelastic Worm‐Like Micelles of Tunable Properties

Parathakkatt, Sudheesh; George, Jinu; Sajeev, M. S.; Sreejith, Lisa

doi:10.1007/s11743-009-1114-x

Cited by 3 publications

(4 citation statements)

References 30 publications

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“…It can be seen that the trend of studied DES viscosity profiles is very similar to that of common ILs reported in the literature, where the viscosities of all DESs decreased with increasing temperature . It is also observed that the alternation of the hydrogen bond donor (i. e. LA, MA, CA and Fr) effects the dynamic viscosity of the produced DES as it can be seen that the highest recorded viscosity at room temperature belong to [ChCl]:[CA] (1003100 mPa s) followed by [ChCl]:[MA] (44079 mPa s).…”

Section: Resultssupporting

confidence: 78%

“…It can be seen that the trend of studied DES viscosity profiles is very similar to that of common ILs reported in the literature, where the viscosities of all DESs decreased with increasing temperature. [71][72][73][74][75] It is also observed that the alternation of the hydrogen bond donor (i. e. LA, MA, CA and In industrial applications, some of these high viscous DES required preheating before processing and need more pumping energy as well. A rheological property that gives indication about this is the yield stresses for the produced DES systems at different temperatures.…”

Section: Shear Flow Behaviormentioning

confidence: 99%

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Gas Solubility and Rheological Behavior of Natural Deep Eutectic Solvents (NADES) via Combined Experimental and Molecular Simulation Techniques

et al. 2017

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A potential of natural deep eutectic solvent (NADES) produced with the mixture of choline chloride with lactic acid, malic acid, citric acid and fructose is studied in this work. Experimental techniques are used to collect thermophysical property data including water content, thermal strength, density and gas solubility of CO2 and N2 data at pressures up to 50 bars. Detailed rheological measurements and various models have been studied to describe the dynamic flow behavior. Moreover, a density functional theory (DFT) and classical molecular dynamics (MD) methods have been used for investigating the physicochemical properties, structuring, dynamics and interfacial behavior of the studied NADES from the nanoscopic point of view to infer its viability for extensive usage. The rheological experimental results show usual shear‐thinning effect in which the η is decreasing with shear rate at all temperatures. A trend of studied NADES viscosity profiles were found as very similar to that of common ionic liquids that were previously, where the viscosities of all studied NADES decreased with increasing temperature. DFT simulations yielded with an accurate quantification of short‐range interaction but liquid state is also characterized by middle and long‐range interaction together with volumetric effects. Molecular orientations were quantified by radial distribution functions and the developed interactions are topologically characterized.

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Section: Resultssupporting

confidence: 78%

“…It can be seen that the trend of studied DES viscosity profiles is very similar to that of common ILs reported in the literature, where the viscosities of all DESs decreased with increasing temperature. [71][72][73][74][75] It is also observed that the alternation of the hydrogen bond donor (i. e. LA, MA, CA and In industrial applications, some of these high viscous DES required preheating before processing and need more pumping energy as well. A rheological property that gives indication about this is the yield stresses for the produced DES systems at different temperatures.…”

Section: Shear Flow Behaviormentioning

confidence: 99%

Gas Solubility and Rheological Behavior of Natural Deep Eutectic Solvents (NADES) via Combined Experimental and Molecular Simulation Techniques

et al. 2017

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“…It was also shown through rheological measurements in 12-2-12,2Br − micellar solutions upon addition of ethylene glycol (an organic polar solvent which remains in the bulk phase) . On the other hand, addition of alcohols, which provoke a decrease in C *, has been shown to result in a stronger tendency to micellar growth by rheology measurements . On the basis of the meaning proposed by the authors for b , the variations observed in this parameter in the presence of the different additives investigated is reasonable.…”

Section: Resultsmentioning

confidence: 52%

“…16 On the other hand, addition of alcohols, which provoke a decrease in C*, has been shown to result in a stronger tendency to micellar growth by rheology measurements. 47 On the basis of the meaning proposed by the authors for b, the variations observed in this parameter in the presence of the different additives investigated is reasonable. It is also consistent with the results obtained for the aqueous dimeric micellar solutions.…”

mentioning

confidence: 62%

Concentration and Medium Micellar Kinetic Effects Caused by Morphological Transitions

Graciani

Rodrı́guez²,

Martı́n³

et al. 2010

Langmuir

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The reaction methyl naphthalene-2-sulfonate + Br(-) was investigated in several alkanediyl-α-ω-bis(dodecyldimethylammonium) bromide, 12-s-12,2Br(-) (with s = 2, 3, 4, 5, 6, 8, 10, 12), micellar solutions in the absence and in the presence of various additives. The additives were 1,2-propylene glycol, which remains in the bulk phase, N-decyl N-methylglucamide, MEGA10, which forms mixed micelles with the dimeric surfactants, and 1-butanol, which distributes between the aqueous and micellar phases. Information about the micellar reaction media was obtained by using conductivity and fluorescence measurements. In all cases, with the exception of water-1,2-prop 12-5-12,2Br(-) micellar solutions, with 30% weight percentage of the organic solvent, a sphere-to-rod transition takes place upon increasing surfactant concentration. In order to quantitatively explain the experimental data within the whole surfactant concentration range, a kinetic equation based on the pseudophase kinetic model was considered, together with the decrease in the micellar ionization degree accompanying micellar growth. However, theoretical predictions did not agree with the experimental kinetic data for surfactant concentrations above the morphological transition. An empirical kinetic equation was proposed in order to explain the data. It contains a parameter b which is assumed to account for the medium micellar kinetic effects caused by the morphological transition. The use of this empirical equation permits the quantitative rationalization of the kinetic micellar effects in the whole surfactant concentration range.

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Octanol-Triggered Self-Assemblies of the CTAB/KBr System: A Microstructural Study

et al. 2010

Self Cite

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A micelle-vesicle transition induced by n-octanol C(8)OH was observed in an aqueous cetyltrimethylammonium bromide (CTAB)/potassium bromide (KBr) system. This transition was investigated by viscosity, rheology, dynamic light scattering (DLS), and direct imaging technique, cryo-transmission electron microscopy (cryo-TEM). Viscometry shows that the system underwent several morphological transitions with the increase in concentration of C(8)OH (regions I-IV). At low octanol concentration (region I), DLS analysis showed an increase in the apparent hydrodynamic diameter of the micelles with the addition of C(8)OH which was supported by cryo-TEM and rheology. With further addition of C(8)OH, transition of the elongated micelles occurred to a viscoelastic fluid comprising entangled wormlike micelles (region II), for which rheological data can be described by the Maxwell model. Further, the wormlike micelles transform to vesicles at [C(8)OH] ≈ 0.020 M (region III). This transition and the consequent changes in the fluid response can be explained in terms of vesicle formation caused by further addition of C(8)OH. Beyond this concentration (region IV), vesicles are the predominant microstructures in the system which shows unusual temperature response.

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A Rheological Approach to Viscoelastic Worm‐Like Micelles of Tunable Properties

Cited by 3 publications

References 30 publications

Gas Solubility and Rheological Behavior of Natural Deep Eutectic Solvents (NADES) via Combined Experimental and Molecular Simulation Techniques

Gas Solubility and Rheological Behavior of Natural Deep Eutectic Solvents (NADES) via Combined Experimental and Molecular Simulation Techniques

Concentration and Medium Micellar Kinetic Effects Caused by Morphological Transitions

Octanol-Triggered Self-Assemblies of the CTAB/KBr System: A Microstructural Study

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