Complex between cationic like-charged polyelectrolytes/surfactants systems

Bassalah, Mohamed E.A.; Cerda, James J.; Sintes, Tomàs; Aschi, Adel; Othman, Tahar

doi:10.1016/j.eurpolymj.2017.08.045

Cited by 10 publications

(7 citation statements)

References 56 publications

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“…We can notice that nonionic and anionic (same charge) surfactants show similar behavior: increase in apparent CMC and decrease in viscosity, starting from relatively low concentration. A model compatible with these findings, with previous models [60,64] and with computer simulation on same-charge PESCs [51,52] is illustrated in Figure 5. The surfactant interacts primarily via hydrophobic groups, forming mixed micelles.…”

Section: Proposed Modelsupporting

confidence: 85%

“…For same sign systems, less studies have been performed, but it is generally concluded both from experiments and simulations [49][50][51][52] that hydrophobic interactions overcome the electrostatic repulsion between charges, causing the surfactant to co-micellize with the polyelectrolyte (Figure 2). Also, interactions with nonionic surfactants have been subject of relatively few publications.…”

Section: Studies On Pescsmentioning

confidence: 99%

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Interactions between an Associative Amphiphilic Block Polyelectrolyte and Surfactants in Water: Effect of Charge Type on Solution Properties and Aggregation

Raffa

2021

Polymers

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The study of interactions between polyelectrolytes (PE) and surfactants is of great interest for both fundamental and applied research. These mixtures can represent, for example, models of self-assembly and molecular organization in biological systems, but they are also relevant in industrial applications. Amphiphilic block polyelectrolytes represent an interesting class of PE, but their interactions with surfactants have not been extensively explored so far, most studies being restricted to non-associating PE. In this work, interactions between an anionic amphiphilic triblock polyelectrolyte and different types of surfactants bearing respectively negative, positive and no charge, are investigated via surface tension and solution rheology measurements for the first time. It is evidenced that the surfactants have different effects on viscosity and surface tension, depending on their charge type. Micellization of the surfactant is affected by the presence of the polymer in all cases; shear viscosity of polymer solutions decreases in presence of the same charge or nonionic surfactants, while the opposite charge surfactant causes precipitation. This study highlights the importance of the charge type, and the role of the associating hydrophobic block in the PE structure, on the solution behavior of the mixtures. Moreover, a possible interaction model is proposed, based on the obtained data.

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Section: Proposed Modelsupporting

confidence: 85%

Section: Studies On Pescsmentioning

confidence: 99%

Interactions between an Associative Amphiphilic Block Polyelectrolyte and Surfactants in Water: Effect of Charge Type on Solution Properties and Aggregation

Raffa

2021

Polymers

View full text Add to dashboard Cite

show abstract

“…[1,4,8] We can notice that nonionic and anionic (same charge) surfactants show similar behavior: increase in apparent CMC and decrease in viscosity, starting from relatively low concentration. A model compatible with these findings, with previous models [60,64] and with computer simulation on same-charge PESCs [51,52] is illustrated in Figure 5. The surfactant interacts primarily via hydrophobic groups, forming mixed micelles.…”

Section: Proposed Modelsupporting

confidence: 85%

“…[2,46,47] When a point of charge neutralization is reached, precipitation or separation of a PESC-rich phase typically occurs, [1,39,40,42] that may eventually redissolve by adding excess surfactant. [48] For same sign systems, less studies have been performed, but it is generally concluded, both from experiments and simulations, [49][50][51][52] that hydrophobic in-teractions overcome the electrostatic repulsion between charges, causing the surfactant to co-micellize with the polyelectrolyte (Figure 2). Also, interactions with nonionic surfactants have been subject of relatively few publications.…”

Section: Studies On Pescsmentioning

confidence: 99%

Interactions Between an Associative Amphiphilic Block Polyelectrolyte and Surfactants in Water: Effect of Charge Type on Solution Properties and Aggregation

Raffa¹

2021

Preprint

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The study of interactions between polyelectrolytes (PE) and surfactants is of great interest for both fundamental and applied research. These mixtures can represent, for example, models of self-assembly and molecular organization in biological systems, but they are also relevant in industrial applications. Amphiphilic block polyelectrolytes represent an interesting class of PE, but their interactions with surfactants have not been extensively explored so far, most studies being restricted to non-associating PE. In this work, interactions between an anionic amphiphilic triblock polyelectrolyte and different types of surfactants bearing respectively negative, positive and no charge, are investigated via surface tension and solution rheology measurements for the first time. It is evidenced that the surfactants have different effects on viscosity and surface tension, depending on their charge type. Micellization of the surfactant is affected by the presence of the polymer in all cases; shear viscosity of polymer solutions decreases in presence of same charge or nonionic surfactants, while the opposite charge surfactant cause precipitation. This study highlights the importance of the charge type, and the role of the associating hydrophobic block in the PE structure, on the solution behavior of the mixtures. Moreover, a possible interaction model is proposed, based on the obtained data.

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“…The vast majority of studies of polyelectrolyte adsorption and mediated interactionboth experimental ,− and theoretical ,− focus on surfaces that carry an opposite charge to that of the polyelectrolyte backbone, where the adsorption is primarily driven by electrostatic attraction to the surface. There have also been efforts focused on electrostatically driven, like-charged polyelectrolyte adsorption to induce long-range repulsion, − where multivalent ion adsorption provides enough overcharging to drive adsorption of a like-charged polymer secondary layer. , Whether like-charged or oppositely charged, the adsorption is driven by electrostatics in these works. When the adsorption is purely electrostatic, bringing two surfaces with the adsorbed polymer results in long-range repulsion and short-range attraction due to the overlap of adsorbed polymer layers and a bridging effect between the polymer and both surfaces, respectively. ,,− ,− …”

Section: Introductionmentioning

confidence: 99%

Nonelectrostatic Adsorption of Polyelectrolytes and Mediated Interactions between Solid Surfaces

et al. 2021

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Polymer-mediated interaction between two solid surfaces is directly connected to the properties of the adsorbed polymer layers. Nonelectrostatic interactions with a surface can significantly impact the adsorption of polyelectrolytes to charged surfaces. We use a classical density functional theory to study the effect of various polyelectrolyte solution properties on the adsorption and interaction between two like-charged surfaces. Our results show that nonelectrostatic interactions not only enhance polyelectrolyte adsorption but can also result in qualitatively different salt effects with respect to the adsorbed amount. In particular, we observe decreasing, increasing, and a previously unreported nonmonotonic behavior in the adsorbed amount of polymer with added salt under the conditions studied, although the nonmonotonic regime only occurs for a narrow range in the parameter space. With sufficient nonelectrostatic adsorption, the adsorbed polymer layers produce a long-range repulsive barrier that is strong enough to overcome dispersive interactions that cause surfaces to attract. Concurrently, a short-range bridging attraction is observed when the two polyelectrolyte layers span both the surfaces. Both the repulsive barrier and bridging attraction depend on the charge density of the polymer backbone and the bulk salt concentration but not on the chain length in the semidilute regime studied.

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Complex between cationic like-charged polyelectrolytes/surfactants systems

Cited by 10 publications

References 56 publications

Interactions between an Associative Amphiphilic Block Polyelectrolyte and Surfactants in Water: Effect of Charge Type on Solution Properties and Aggregation

Interactions between an Associative Amphiphilic Block Polyelectrolyte and Surfactants in Water: Effect of Charge Type on Solution Properties and Aggregation

Interactions Between an Associative Amphiphilic Block Polyelectrolyte and Surfactants in Water: Effect of Charge Type on Solution Properties and Aggregation

Nonelectrostatic Adsorption of Polyelectrolytes and Mediated Interactions between Solid Surfaces

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