Effect of aromatic solubilizates on the shape of CTABr micelles

Heindl, A.; Strnad, J.; Kohler, Hans‐Helmut

doi:10.1021/j100105a035

Cited by 58 publications

(40 citation statements)

References 4 publications

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“…Variation of the QB absorption maxima as a function of W in QB senses is close to but never equal to the bulk water the system Brij 30-cyclohexane, () B 1 , (l) B 2 , and C 12 E 5 -hexane, (ᮀ) (Figs. 3,7,8), thus, this small probe resides in the structured…”

Section: Qb In Reverse Micelles Of Bhdc In Benzenementioning

confidence: 99%

“…Recently, the ratio of intensities in UV spectra has also been considered of value to determine the 1 Author to whom correspondence should be addressed. micropolarity of micelles solubilizates (7). The aim of this study was to investigate, by using QB, cepting water to W values higher than 50 (17) and in decane which accepts water till W Å 20. the interface polarity of reversed micelles with surfactants with characteristics different from those of AOT in their Unlike the ionic surfactant, the hydrophilic part of nonionic surfactants of the class of poly(oxyethylene) alkyl polar head groups such as cationic and nonionic ones.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Micropolarity of Reversed Micelles: Comparison between Anionic, Cationic, and Nonionic Reversed Micelles

Correa

Biasutti

Silber

1996

Journal of Colloid and Interface Science

195

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Section: Qb In Reverse Micelles Of Bhdc In Benzenementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Micropolarity of Reversed Micelles: Comparison between Anionic, Cationic, and Nonionic Reversed Micelles

Correa

Biasutti

Silber

1996

Journal of Colloid and Interface Science

195

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“…As a result, mixed micelles are formed that usually grow in size upon addition of solubilizate. [4][5][6][7][8] The driving force for this kind of solubilization mechanism is the entropy of mixing surfactant and solubilizate as well as, in the case of ionic surfactants, the reduction of surface charge density in the micelles. On the other hand, long and flexible aliphatic hydrocarbons have been found to be solubilized into the interior core of the micelles, forming swollen micelles that eventually may grow into microemulsion droplets rather than mixed micelles.…”

Section: Introductionmentioning

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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“…This is the result of its more efficient binding with CDAB micelles and more efficient promotion of the growth of cylindrical micelles. 19 The effect of the degree of ordering in system I on the reactivity of EATP can be estimated by the values of P2 = /cm/kE and P3 = kf_,/koH (kE is the reaction rate constant in the E-phase), which characterize the ordering effects in comparison with the micellar and aqueous alkaline solutions, respectively. For substrates 2 and 3, the P2 values indicate a -7--L7-fold decrease in the reaction rate in the E-phase as compared to that in the micellar phase (see Table 2).…”

Section: Resultsmentioning

confidence: 99%

Kinetics of alkaline hydrolysis of esters of phosphorus acids in micellar and hexagonal phases in the cetyldimethylethylammonium bromide—NaOH—water system

et al. 1998

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The influence of micellar (Mi) and hexagonal (E) mesophases of the cetyldimethylethylammonium bromide--NaOH--water system (I) on the rates of alkaline hydrolysis of, and O,O-di~-nitrophcnyl)methyl phosphonate (4) was studied by UV spectrophotomerry. The binding constants of the substrates, critical mieelle concentrations, and rate constants of reactions in the micellar phase were determined, in micellar solutions of system I, a tenfold increase in the rates of alkaline hydrolysis of 2--4 was observed. An increase in the degree of medium ordering during the formation of the E-phase results in a twofold acceleration of alkaline hydrolysis of 2 and 3 and in the inhibition of this process in the case of 4.

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Effect of aromatic solubilizates on the shape of CTABr micelles

Cited by 58 publications

References 4 publications

Micropolarity of Reversed Micelles: Comparison between Anionic, Cationic, and Nonionic Reversed Micelles

Micropolarity of Reversed Micelles: Comparison between Anionic, Cationic, and Nonionic Reversed Micelles

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

Kinetics of alkaline hydrolysis of esters of phosphorus acids in micellar and hexagonal phases in the cetyldimethylethylammonium bromide—NaOH—water system

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