Effect of Hofmeister anions on micellization and micellar growth of the surfactant cetylpyridinium chloride

Abezgauz, Ludmila; Kuperkar, Ketan; Hassan, P. A.; Ramon, Ory; Bahadur, Pratap; Danino, Dganit

doi:10.1016/j.jcis.2009.08.045

Cited by 162 publications

(128 citation statements)

References 55 publications

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“…Furthermore, the filament lifetime depends more strongly on zero-shear viscosity in the linear regime (t fil / g 1:3 0 ) than in the branched regime (t fil / g 0:9 0 ). For CPyCl/NaSal solutions, the change of the micellar morphology from a linear to branched structure at R max is confirmed by rheological measurements [Oelschlaeger et al (2009)] and cryo-TEM studies [Abezgauz and Danino (2007)]. Similar results are obtained for the CTAB/NaClO 3 system, when solutions with R < R max and R > R max are compared [ Fig.…”

Section: E Low Salt Regimesupporting

confidence: 64%

Elongational deformation of wormlike micellar solutions

Sachsenheimer

Oelschlaeger

Müller

et al. 2014

Journal of Rheology

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We have investigated the uniaxial elongation behavior of six different wormlike micelle systems covering a broad range of surfactant concentrations cs and salt/surfactant ratios R using the capillary breakup elongational rheometry (CaBER). In the fast-breaking limit (high cs and R), filament lifetime tfil is controlled by the equilibrium shear modulus G0 and the breakage time λbr obtained from small oscillatory shear according to tfil/G0∝λbr2/3 and relaxation time ratios λe/λs≈1 are found. When reptation dominates (high cs, low R) λe/λs<1 is observed similar as for solutions of covalently bound polymers. In this concentration regime, the micellar structure seems not to be affected by the strong elongational flow. In contrast, high filament lifetimes up to 1000 s and λe/λs values up to 10 are observed at low cs irrespective of R. This indicates the formation of elongation-induced structures (EISs). A minimum viscosity and a minimum initial diameter are required for creating EIS. Additional filament stretching experiments indicate that a critical total deformation has to be exceeded for structure build-up. Finally, our experiments reveal a distinct difference regarding the dependence between solutions of linear and branched micelles of filament lifetime on viscosity suggesting that CaBER is a versatile means to distinguish between these structures.

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Section: E Low Salt Regimesupporting

confidence: 64%

Elongational deformation of wormlike micellar solutions

Sachsenheimer

Oelschlaeger

Müller

et al. 2014

Journal of Rheology

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“…The factors include the chemical structure of surfactant molecules [5][6][7][8], such as the nature of headgroups and the nature of counterions, and the solution conditions [9][10][11][12][13][14][15][16][17][18], such as concentration, temperature, the pH, the ionic strength, and the presence of additives. The nature of surfactant counterion or the nature of counterions from the salts added to the surfactant solution [3][4][5][9][10][11][12][13][14][19][20][21][22][23] significantly affects the cmc, micelle size, micelle shape, micellar catalysis, emulsion size, interfacial property, rheological property, phase behavior, etc. For the single ionic surfactants, counterions stabilize ionic surfactant micelles by binding to the micellar surface and screening the electrostatic repulsion between the surfactant headgroups [6,[8][9][10][11][12], thus the binding affinity of counterions influences both the process of micellization and aggregation.…”

Section: Introductionmentioning

confidence: 99%

Specific ion effects on the micellization of aqueous mixed cationic/anionic surfactant systems with various counterions

Hao

Yang

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…To prevent electron beam radiation damage low dose imaging was used. [55][56][57] The solutions were maintained at 30 C in a water bath and then transferred to the controlled environment vitrication system (CEVS) for preparation. A 5 ml drop was placed on a perforated carbon grid (Ted Pella) and blotted to form a thin lm of sample.…”

Section: Methodsmentioning

confidence: 99%

1-Hexanol triggered structural characterization of the worm-like micelle to vesicle transitions in cetyltrimethylammonium tosylate solutions

et al. 2015

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The cationic surfactant cetyltrimethylammonium tosylate (CTAT) forms highly viscous/viscoelastic solutions and worm-like micelles at relatively low concentrations. The effect of 1-alkanols with short to long alkyl chains viz. ethanol, 1-butanol, 1-hexanol and 1-octanol on CTAT micelles was examined. In particular, a detailed study on the effect of 1-hexanol was carried out by viscosity, cryogenic transmission electron microscopy (cryo-TEM), nuclear magnetic resonance (NMR) and small-angle neutron scattering (SANS) to observe microstructural changes in CTAT micelles. 1-Hexanol displays a distinct interaction with CTAT micelles strongly dependent on CTAT concentration. Up to a certain critical CTAT concentration, 1-hexanol molecules penetrate into the micelles and show growth.Characterization by direct cryo-TEM imaging implies that upon progressive addition of 1-hexanol, worm-like CTAT micelles first grow and finally transform into vesicles. The course of vesicle formation was followed by SANS measurements. The site of 1-hexanol in the micelles close to the palisade layer was evaluated using 2D NMR. This study devotes a fundamental knowledge for controlling the shape and size of worm-like micelles that find many industrial applications particularly in personal-and home-care products.

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Effect of Hofmeister anions on micellization and micellar growth of the surfactant cetylpyridinium chloride

Cited by 162 publications

References 55 publications

Elongational deformation of wormlike micellar solutions

Elongational deformation of wormlike micellar solutions

Specific ion effects on the micellization of aqueous mixed cationic/anionic surfactant systems with various counterions

1-Hexanol triggered structural characterization of the worm-like micelle to vesicle transitions in cetyltrimethylammonium tosylate solutions

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