The interaction of isomeric hexanediols with sodium dodecyl sulfate and dodecyltrimethylammonium bromide micelles

Kennedy, Christopher; MacMillan, Samantha N.; McAlduff, Michael; Marangoni, D. Gerrard

doi:10.1007/s003960000392

Cited by 20 publications

(17 citation statements)

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“…The K x values for SDS/1-alkanols 5,6 , SDS/α,ω-alkanediols 9 , and DTAB/1- bC a , to experimental data. alkanols Kawamura, H., unpublished data systems obtained by the differential conductivity technique, and those of DTAB/1,2-alkanediols and DTAB/α,ω-alkanediols systems determined from the NMR paramagnetic relaxation enhancement experiment 10,11 were also plotted in the figure to compare with the present result. The standard Gibbs energy change of transfer per methylene group, ΔG 0 CH 2 , was calculated from the slope of the straight line in Fig.…”

Section: Resultsmentioning

confidence: 78%

Effect of Hydroxyl Groups on Solubilization States of Alkandiols in DTAB Micelles: Application of a Differential Conductivity Technique

Kawamura¹,

Takeda²,

Tagawa³

et al. 2017

J. Oleo Sci.

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Section: Resultsmentioning

confidence: 78%

Effect of Hydroxyl Groups on Solubilization States of Alkandiols in DTAB Micelles: Application of a Differential Conductivity Technique

Kawamura¹,

Takeda²,

Tagawa³

et al. 2017

J. Oleo Sci.

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“…For the SDS=1,6-HXD systems, the D mic H values begin to decrease in a regular fashion at an alcohol concentration of 0.025 mol dm À3 , whereas for 1,2-HXD, the D mic H values continue to increase until $0.100 mol dm À3 of alcohol is added to the mixed system. It is known that the 1,2-HXD is a more hydrophobic alcohol than 1,6-HXD [27,29] and as a result, it partitions into the micelle to a greater extent. Hence, the contributions to the overall D mic H values from alkyl-chain water contacts should be more substantial for the more hydrophobic alcohol.…”

Section: Resultsmentioning

confidence: 99%

“…[6,[25][26][27][28] The placement of the second hydroxyl headgroup appears to have a significant impact on how the diol interacts with the micelle and, hence, modifies the properties of the mixed aggregates. In the case of hexanediols, the position of the hydroxyl groups in relation to each other has been observed to play a significant role in the degree to which the micellar properties are altered.…”

Section: Introductionmentioning

confidence: 97%

“…In the case of hexanediols, the position of the hydroxyl groups in relation to each other has been observed to play a significant role in the degree to which the micellar properties are altered. [27] As well, the partition coefficients of a,x-alkanediols are all substantially smaller than 1,2-alkanediols of comparable carbon chain length. [27,29] This was interpreted in terms of the decrease in the entropy of transfer of a,x-alkanediols versus their 1,2 counterparts, due to the wicket-like conformation that these alcohols adopt in the micelle palisade region.…”

Section: Introductionmentioning

confidence: 98%

“…[27] As well, the partition coefficients of a,x-alkanediols are all substantially smaller than 1,2-alkanediols of comparable carbon chain length. [27,29] This was interpreted in terms of the decrease in the entropy of transfer of a,x-alkanediols versus their 1,2 counterparts, due to the wicket-like conformation that these alcohols adopt in the micelle palisade region. [26,29] The adoption of this wicket-like configuration decreases the entropy of transfer (D tr S ) per CH 2 group, leading to the less negative D tr G values, and hence smaller partition coefficients.…”

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Thermodynamics of Mixed Micellization of Isomeric Hexanediols in Sodium Dodecyl Sulfate

Comeau

McLachlan

Marangoni

2009

Journal of Dispersion Science and Technology

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The thermodynamic parameters of mixed micelle formation (D mic G , D mic H , D mic S ) have been determined for a series of mixed micelles consisting of two isomeric hexanediols (1,2-hexanediol and 1,6-hexanediol) in sodium dodecylsulfate micellar solutions. The enthalpies of micellization were determined directly from isoperibol solution calorimetry. Gibbs energies and entropies of micelle formation were obtained from the application of the charged pseudo-phase model of micelle formation to the calorimetric critical micelle concentration values. The location of the alcohols in the micellar palisade layer has been determined from two-dimensional nuclear Overhauser enhancement spectroscopy (NOESY) experiments. The calorimetric titration data indicates that the placement of the hydroxyl groups on the six carbon backbone greatly affects the energetics of the micelle formation process. From the NMR data, the location of the cosurfactant in the micelle has been determined. These results indicate that the locus of solubilization affects the subtle balance of forces responsible for the formation of the mixed aggregates.

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The Interaction of Glymes with Surfactant Micelles

Petropolis¹,

Petropolis²,

MacNeil³

et al. 2020

J Surfact & Detergents

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The critical micelle concentrations (CMC) values and counterion dissociation (α values) have been determined for a number of mixed micellar systems consisting of two typical ionic surfactants and glycol ethers (glymes) as cosurfactants, namely diethylene glycol dimethyl ether, diethylene glycol diethyl ether, triethylene glycol dimethyl ether, and tetraethylene glycol dimethyl ether. Conductance experiments were used to determine the CMC and α values of the mixed micelles as a function of glyme concentration in the aqueous mixed solvent. Favorable interactions between sodium dodecyl sulfate micelles and glyme cosurfactants were deduced from the decreases in the CMC values and the large increase in the α values of these systems as a function of increasing glyme concentration in the mixed solvents. In contrast to the anionic surfactant/glyme systems, in general, there appeared to be little favorable interactions between the surfactant and glymes when micelles of the cationic surfactant dodecyltrimethylammonium bromide were formed in water/ glyme solvent systems containing an increasing amount of the glymes. The interaction of glymes with the surfactant micelles was examined closely via 13 C nuclear magnetic resonance (NMR) chemical shifts for both surfactant and glyme carbons; these chemical shifts changes were interpreted in terms of the distribution and the localization of the glymes in the aggregates. Finally, partition constants, determined from two-dimensional diffusion-oriented spectroscopy (2D-DOSY) experiments, were used to calculate thermodynamic quantities of transfer of the glymes between the bulk phase and the self-assembled aggregates. All these results are interpreted in terms of the key contributions that both the glyme ethoxylated groups and alkyl endgroups make to the hydrophobic interactions.

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The interaction of isomeric hexanediols with sodium dodecyl sulfate and dodecyltrimethylammonium bromide micelles

Cited by 20 publications

References 0 publications

Effect of Hydroxyl Groups on Solubilization States of Alkandiols in DTAB Micelles: Application of a Differential Conductivity Technique

Effect of Hydroxyl Groups on Solubilization States of Alkandiols in DTAB Micelles: Application of a Differential Conductivity Technique

Thermodynamics of Mixed Micellization of Isomeric Hexanediols in Sodium Dodecyl Sulfate

The Interaction of Glymes with Surfactant Micelles

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