Rheology of branched wormlike micelles

Rogers, Simon A.; Calabrese, Michelle A.; Wagner, Norman J.

doi:10.1016/j.cocis.2014.10.006

Cited by 124 publications

(91 citation statements)

References 57 publications

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“…It is known that the mixtures of oppositely charged surfactants can self-assemble into such microstructures as micelles, vesicles, lamellae, columnar and the cubic mesophases, depending on the different groups and the shape of the surfactant molecules. Among these microstructures, viscoelastic wormlike micelles formed in surfactants and its mixed systems have many potential applications, thus, there has been much interest in studying the properties of the wormlike micelles, in particular those stimuli-responsive surfactants systems in recent years [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Rheological Properties of Wormlike Micelles Formed in Aqueous Systems of 3‐Alkoxy‐2‐hydroxypropyl Trimethyl Ammonium Bromides in the Presence of Sodium Octanoate

Ping

Geng

Wei

et al. 2015

J Surfact & Detergents

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The rheological properties of aqueous systems composed of each of the four homologous cationic surfactants (3-alkoxy-2-hydroxypropyl trimethyl ammonium bromides, C n HTAB, n = 12, 14, 16 and 18) in the presence of an anionic surfactant, sodium octanoate (SO), have been studied by using steady state and frequency sweep rheological measurements. The effects of surfactant concentration, hydrophobic chain length and temperature were investigated. In C 14 HTAB solution, the viscosity shows shear thinning in the concentration range of C C14HTAB [320 mmol/kg. Addition of SO promotes the micellar growth and results in the generation of wormlike micelles. Zero-shear viscosity (g 0 ) of the binary surfactant system exhibits a maximum point in the investigated concentration range, suggesting the interaction between C 14 HTAB and SO molecules is strongest at the optimal ratio of C 14 HTAB with SO. The decrease in viscosity was attributed to be the transition from entangled wormlike micelles to branching micelles after the maximum point, cryo-TEM images revealed the changes in the structure of the wormlike micelles.

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Section: Introductionmentioning

confidence: 99%

Rheological Properties of Wormlike Micelles Formed in Aqueous Systems of 3‐Alkoxy‐2‐hydroxypropyl Trimethyl Ammonium Bromides in the Presence of Sodium Octanoate

Ping

Geng

Wei

et al. 2015

J Surfact & Detergents

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“…Further, depending upon the surfactant and salt concentrations, which in turn determine the microstructure, we observe normal, subdiffusive and superdiffusive motion of surfactants. Specifically, superdiffusive behavior is associated with branch sliding, breakage and recombination of micelle fragments as well as constraint release in entangled systems.Over the past decades, the structure, dynamics and mechanical properties of self-assembled aggregates of cationic surfactants have been studied extensively [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Self-assembly of cationic surfactant solutions can be controlled by manipulating the solvent-mediated electrostatic interactions among the surfactant molecules by altering the counter ion concentration.…”

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confidence: 99%

“…chains as well as branched and loopy structures [8][9][10]. Aggregate shape, which depends on the solution temperature as well as the concentrations of the surfactant and the counter ion, has a profound effect on the rheological properties of micelle solutions.…”

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Anomalous diffusion and stress relaxation in surfactant micelles

Dhakal¹,

Sureshkumar²

2017

Phys. Rev. E

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We present the first molecular dynamics study to probe the mechanisms of anomalous diffusion in cationic surfactant micelles in the presence of explicit salt and solvent-mediated interactions.Simulations show that when the counter ion density increases, saddle-shaped interfaces manifest leading to the formation of branched structures. In experiments, branched structures exhibit lower viscosity as compared to linear and wormlike micelles, presumably due to stress relaxation arising from the sliding motion of branches along the main chain. Our simulations provide conclusive evidence and a mechanism of branch motion and stress relaxation in micellar fluids. Further, depending upon the surfactant and salt concentrations, which in turn determine the microstructure, we observe normal, subdiffusive and superdiffusive motion of surfactants. Specifically, superdiffusive behavior is associated with branch sliding, breakage and recombination of micelle fragments as well as constraint release in entangled systems.Over the past decades, the structure, dynamics and mechanical properties of self-assembled aggregates of cationic surfactants have been studied extensively [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Self-assembly of cationic surfactant solutions can be controlled by manipulating the solvent-mediated electrostatic interactions among the surfactant molecules by altering the counter ion concentration. A rich variety of fluctuating micelle morphologies can be thus formed such as spheres, cylinders, wormlike arXiv:1610.08544v1 [cond-mat.soft]

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“…The formation of rod-/worm-like micelles and/or gel structure, and their resulting entanglements account for the viscoelastic nature of such solutions Rogers et al, 2014;Su et al, 2013;Yang et al, 2015;Zhang et al, 2013). Viscoelastic surfactant solutions lead to an improved permeability due to the elastic nature of proppant transport and the formation of a better fracture geometry (Luo et al, 2014;Samuel et al, 1999).…”

Section: Introductionmentioning

confidence: 98%