Critical aggregation concentration in the PAMPS (10%)/DTAB system

Ritacco, Hernán; Kurlat, D. H.

doi:10.1016/s0927-7757(02)00551-4

Cited by 30 publications

(20 citation statements)

References 29 publications

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“…When an oppositely charged surfactant is added to a polyelectrolyte solution it first progressively replaces the polyelectrolyte counterions in the vicinity of the macromolecular main chain. Generally, this process does not conduct to observable changes in the bulk properties of the system as could be followed with commonly used techniques as conductivity or light scattering, however they can be detected by more sensitive, and less common techniques such as Electric birefringence [9][10][11][12][13]. This situation changes when a certain surfactant concentration, the critical aggregation concentration (cac) is reached.…”

Section: Introductionmentioning

confidence: 99%

Effect of surfactant concentration on the responsiveness of a thermoresponsive copolymer/surfactant mixture with potential application on “Smart” foams formulations

Lencina

Miconi

Fernández-Leyes

et al. 2018

Journal of Colloid and Interface Science

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The Cop-L/DTAB mixtures were capable of producing thermoresponsive foams but only in a very narrow surfactant concentration (c) range, 0.3 < c< 1.6 mM. The responsiveness is due to a modification of the interfacial compression elasticity induced by conformational changes of the Polyeletrolyte/surfactant aggregates at the interface. This is possible only for c < 1.6 because higher surfactant concentrations induce the polymer collapse at all temperatures, eliminating the thermal responsiveness.

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Section: Introductionmentioning

confidence: 99%

Effect of surfactant concentration on the responsiveness of a thermoresponsive copolymer/surfactant mixture with potential application on “Smart” foams formulations

Lencina

Miconi

Fernández-Leyes

et al. 2018

Journal of Colloid and Interface Science

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“…It is generally admitted that surfactant micelles start to form much above CAC, decorating the polymer chains, at least when these chains are sufficiently flexible. Recent calorimetry [6] and electrical birefringence [7,8] experiments with cationic surfactants and anionic polymers have revealed that polymer/surfactant association already occurs below CAC. It has been proposed that this binding below CAC is noncooperative, and becomes more cooperative above CAC only.…”

Section: Introductionmentioning

confidence: 99%

Interaction of cationic surfactants with carboxymethylcellulose in aqueous media

Mata

Patel

Jain

et al. 2006

Journal of Colloid and Interface Science

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“…Therefore, the hydrophobic chains begin to have a greater intermolecular association and form a dynamic physical cross-linked network, as shown in Figure 5. This leads to a sharp increases in fluid mechanical volume and viscosity [22].…”

Section: Critical Association Concentrationmentioning

confidence: 99%

Novel Hydrophobic Associating Polymer with Good Salt Tolerance

et al. 2018

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Abstract:A hydrophobic associating polymer named DiPHAM (acrylamide/sodium acrylamide-2-methylpropanesulfonic/sodium acrylate/N,N-di-n-dodecylacrylamide) with good salt tolerance was synthesized via photo-initiation polymerization. The critical association concentration (CAC) of DiPHAM was determined by viscosity changes to be 490 mg/L with different DiPHAM concentrations and particle sizes varied under such dynamic conditions. The influences of aqueous metal ions with different charges on its aqueous solution were investigated by measuring apparent viscosity, viscoelasticity, thixotropy, rheology, and particle size, and by SEM observation. The apparent viscosity of the DiPHAM solution was affected by metal ions to some extent, but the viscosity of the polymer can be still maintained at 55 mPa·s under 20 × 10 4 mg/L NaCl. Divalent metal ions show greater impact on DiPHAM aqueous solutions, but the polymer solutions showed resistance to the changes caused in viscosity, structure, and viscoelasticity by Ca 2+ and Mg 2+ ions. The salt tolerance of DiPHAM is due to the combination of hydrophobic association, the electrostatic shield, and double layer compression of the hydration shell. Increasing the ion concentration enhances the dehydration and further compresses the hydration shell, making the non-structural viscosity decrease, even "salting out". Measurements of rheological properties showed that DiPHAM solutions could maintain a relatively high viscosity (0.6%-71 mPa·s/0.3%-50 mPa·s) after 120 min of continuous shearing (170 s −1 ) at 140 • C. Under high-salinity (5000 mg/L Ca 2+ /3000 mg/L Mg 2+ ) conditions, the solution with 0.6 wt% DiPHAM still maintained a high viscosity (50 mPa·s/70 mPa·s) after continuously shearing for 120 min at 120 • C and 170 s −1 . The good salt tolerance of DiPHAM can lead to a variety of applications, including in fracturing fluids for enhanced oil recovery (EOR) and in sewage treatment.

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Critical aggregation concentration in the PAMPS (10%)/DTAB system

Cited by 30 publications

References 29 publications

Effect of surfactant concentration on the responsiveness of a thermoresponsive copolymer/surfactant mixture with potential application on “Smart” foams formulations

Effect of surfactant concentration on the responsiveness of a thermoresponsive copolymer/surfactant mixture with potential application on “Smart” foams formulations

Interaction of cationic surfactants with carboxymethylcellulose in aqueous media

Novel Hydrophobic Associating Polymer with Good Salt Tolerance

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