A Field Dependent 2H Nuclear Magnetic Relaxation Study of the Aggregation Behavior in Micellar Solutions of CTAB and SDS

Toernblom, Maria; Henriksson, Ulf; Ginley, Molly

doi:10.1021/j100079a025

Cited by 54 publications

(83 citation statements)

References 14 publications

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“…In accordance, both surfactants were observed to grow weakly at low surfactant concentrations followed by a much stronger growth behavior beyond a certain surfactant concentration. Such a more or less abrupt increase in the extent of growth has been observed for several surfactant systems and the surfactant concentration where the aggregation numbers start to grow rapidly is often referred to as the second cmc [14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 87%

Explaining the growth behavior of surfactant micelles

Bergström

2015

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 87%

Explaining the growth behavior of surfactant micelles

Bergström

2015

Journal of Colloid and Interface Science

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“…24 It is seen that CMC 2 is strongly influenced by all three constants in that way CMC 2 From experiments, it is known that increasing the electrolyte concentration lowers CMC 2 and favors larger micelles. [35][36][37] According to the Poisson-Boltzmann theory, k c H 0 and k c decreases, whereask c increases, as the influence of electrostatics is decreased when an increasing amount of electrolyte is added to the solution. 21,38 This indicates that the joint effect of increasingk c and decreasing k c H 0 is mainly responsible for the lowering of CMC 2 upon adding salt to a charged surfactant system.…”

Section: A the Influence Of Bending Elasticity Constants On The Growmentioning

confidence: 99%

A theoretical investigation of the influence of the second critical micelle concentration on the solubilization capacity of surfactant micelles

Bergström

2018

AIP Advances

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The solubilization of hydrophobic components by surfactants that form microemulsion droplets has been investigated from a theoretical point of view. By means of combining thermodynamics of self-assembly to form small systems with bending elasticity theory, we have been able to demonstrate a strong correlation between the second critical micelle concentration (CMC 2 ) of surfactant micelles and their solubilization capacity (σ). The correlation may be rationalized as a consequence of all three bending elasticity constants spontaneous curvature (H 0 ), bending rigidity (k c ) and saddle-splay constant (k c ) showing similar trends with respect to the two quantities, i.e. σ increases and CMC 2 decreases with decreasing values of k c H 0 and increasing values of k c and k c , respectively. As a result, we demonstrate that the solubilization capacity is predicted to always be higher for a gemini surfactant with CMC 2 = 11 mM as compared with a gemini surfactant with CMC 2 = 18 mM. The predicted correlation between solubilization capacity and CMC 2 agrees with experimental observations showing that surfactants forming larger micelles in general have better solubilization capacity than surfactants forming smaller micelles. The theory also demonstrates, in agreement with experiments, that σ is raised in the entire range of surfactant concentrations, below as well as above CMC 2 , regardless of micelle size. Consequently, our theory predicts that small micelles formed below CMC 2 increase in size, whereas large rodlike or wormlike micelles formed above CMC 2 decrease in size, as a hydrophobic solubilizate is added to a micellar solution. © 2018 Author(s)

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“…Ionic surfactant micelles can transform from spheres into rod-like micelles, thread-like micelles, and other self-assembled entities including vesicles and liquid-crystalline phases upon increase of concentration or temperature or addition of additives [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Specifically, addition of salts often provides a driving force for microstructural transitions and micellar growth already at low concentrations.…”

Section: Introductionmentioning

confidence: 99%