Effect of monomeric and polymeric co-solutes on cetyltrimethylammonium bromide wormlike micelles: Rheology, Cryo-TEM and Small-angle neutron scattering

Francisco, Kelly R.; Silva, Marcelo da; Sabadini, Edvaldo; Karlsson, Göran; Dreiss, Cécile A.

doi:10.1016/j.jcis.2010.01.086

Cited by 37 publications

(42 citation statements)

References 61 publications

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“…The increase of the total surfactant concentration may enhance the hydrophobicity of the "solvent" because of the cosolvent property of [C 8 mim]Br, which may improve the flexibility of micelles. This increase in flexibility is expected to lower the zero-shear viscosity η 0 and relaxation time τ R by enhancing the ability to form connections ("branching points") [37]. At the same time, the enhancement of the "solvent" hydrophobicity is unfavourable to the formation of long wormlike micelles.…”

Section: Effect Of Surfactant Compositionmentioning

confidence: 99%

“…At the same time, the enhancement of the "solvent" hydrophobicity is unfavourable to the formation of long wormlike micelles. The micelles begin to form connections when the formation of a threefold junction is favored over endcaps because the scission energy becomes much larger than the energy of formation of a threefold junction [37]. The 'branching points' can slide along the wormlike micelles and provide an additional mechanism of stress relaxation.…”

Section: Effect Of Surfactant Compositionmentioning

confidence: 99%

“…NaSal is an aromatic organic salt who can form hydrophobic interaction with the wormlike micelles and thus has different effects on the rheology behavior of wormlike micelle solution compared with simple salt NaBr [37]. However, Fig.…”

Section: Effect Of Nabr and Nasalmentioning

confidence: 99%

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Rheological behavior of mixed system of ionic liquid [C8mim]Br and sodium oleate in water

Yue

et al. 2015

Front. Chem. Sci. Eng.

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We report on the rheological behavior of wormlike micelles constructed by ionic liquid surfactant [C 8 mim]Br (1-octyl-3-methylimidazolium bromide) and anionic surfactant sodium oleate (NaOA) in aqueous solution. The effects of surfactant composition, total surfactant concentration, added salts, and temperature were investigated. The prevailing surfactant effect at lower concentration and the leading cosolvent effect at higher concentration of [C 8 mim]Br may be the main reasons for appearance of well-established maximum in key rheological parameters with variation of surfactant composition and total surfactant concentration. The Cole-Cole plots demonstrate that the systems (total surfactant concentration falls within 0.17-0.35 mol$L -1 and molar ratio 0.33£R£0.50) fit the Maxwell's mechanical model as linear viscoelastic fluid. The addition of NaBr or sodium salicylate decreases significantly the viscosity and the relaxation time of the wormlike micelle solution but cannot change the value of plateau modulus G 0 . The present system has low rheological tolerance to temperature. The increase of temperature decreases the average contour length and viscosity of wormlike micelles and thus strengthens the relaxation progress of diffusion and weakens the relaxation progress of reptation. Increasing the temperature also decreases the value of plateau modulus G 0 and shifts the minimum value of the loss modulus G ″ min to higher frequencies.

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Section: Effect Of Surfactant Compositionmentioning

confidence: 99%

Section: Effect Of Surfactant Compositionmentioning

confidence: 99%

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Rheological behavior of mixed system of ionic liquid [C8mim]Br and sodium oleate in water

Yue

et al. 2015

Front. Chem. Sci. Eng.

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“…The viscoelastic properties of some WLM systems can be tuned by light [14,15], pH [16] and addition of hydrophobic solute [17]. Therefore, this is an interesting system in which macroscopic properties can be switched via simple molecular triggers [18].…”

Section: Introductionmentioning

confidence: 99%

Effects of some anions of the Hofmeister series on the rheology of cetyltrimethylammonium-salicylate wormlike micelles

Alkschbirs

Percebom

Loh

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…6,8,[17][18][19][20] Mixtures of cationic and anionic surfactants, 20 zwitterionic dimeric surfactant solutions 21 and cationic surfactant solutions 20,22 have also been investigated. A common surfactant in wormlike micelle literature is cetyl trimethylammonium bromide (CTAB) [23][24][25][26][27] which forms cylindrical wormlike surfactant micelles; systems forming reverse micelles have also been reported.…”

Section: Introductionmentioning

confidence: 99%

Characterization of dynamics and internal structure of a mixed-surfactant wormlike micellar system using NMR and rheometry

2012

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We use complementary experiments-proton NMR diffusometry and relaxometry, deuterium NMR lineshapes, and rheometry-to construct a comprehensive picture of the microscopic structure of a mixed-surfactant wormlike micellar system composed of a zwitterionic surfactant and an anionic surfactant in brine. In this system, at some surfactant concentrations, the time for micellar breaking and recombination s b is not small compared with the micellar reptation time s R , weakening the condition to obtain a stress relaxation function with just one relaxation time at long times. From NMR relaxometry, we determine the overlap concentration. Deuterium NMR spectral lineshapes indicate the presence of a wide angular distribution in the orientational order. NMR diffusometry and rheology probe different timescales and yield complementary information indicating polymer-like behaviour at the corresponding lengthscales. Via NMR, surfactant diffusion coefficients are seen to decrease with increasing diffusion time, consistent with restricted diffusion within a reptating micelle. At the same time, comparison of measurements with protonated and deuterated surfactants strongly suggests that the measured short and long time diffusion coefficients correspond to intra-micellar and micellar diffusion, respectively. Fitting the diffusion results to a simple model, the average end-to-end micellar distance is estimated to be in the 1 mm range and only weakly dependent on concentration. The water diffusion measurements, on the other hand, imply a high degree of water structuring at the micellar surface. We also find that the wormlike micelles obeyed simple polymer-like scaling behaviors, with a crossover from Zimm-like (diffusion) to Rouse-like (rheology) exponents.

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Effect of monomeric and polymeric co-solutes on cetyltrimethylammonium bromide wormlike micelles: Rheology, Cryo-TEM and Small-angle neutron scattering

Cited by 37 publications

References 61 publications

Rheological behavior of mixed system of ionic liquid [C8mim]Br and sodium oleate in water

Rheological behavior of mixed system of ionic liquid [C8mim]Br and sodium oleate in water

Effects of some anions of the Hofmeister series on the rheology of cetyltrimethylammonium-salicylate wormlike micelles

Characterization of dynamics and internal structure of a mixed-surfactant wormlike micellar system using NMR and rheometry

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