Effects of KBr and n-decanol on the properties of cetyltrimethylammonium bromide micelles in aqueous solutions: A microelectrode voltammetric study

Ferreira, Tiago Luiz; Seoud, Omar A. El; Bertotti, Mauro

doi:10.1016/j.jelechem.2007.02.016

Cited by 9 publications

(12 citation statements)

References 39 publications

(58 reference statements)

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“…53 In addition to conclusions based on the effect of DS on the packing parameter of the aggregates, vide infra, we followed the evolution of several properties of the solution, induced by adding increased concentrations of DS to 20 mmol surfactant. Values of the cmc of the surfactants employed are: 0.40 mmol, 0.54 mmol and 1.0 mmol, for C 16 VnImBr; C 16 MeImBr; C 16 Me 3 ABr, respectively, 54,58 i.e., all measurements discussed below were done on micellar solutions. The techniques that we employed were turbidity, viscometry, DLS, and TEM.…”

Section: Resultsmentioning

confidence: 99%

Drug induced micelle-to-vesicle transition in aqueous solutions of cationic surfactants

et al. 2017

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Section: Resultsmentioning

confidence: 99%

Drug induced micelle-to-vesicle transition in aqueous solutions of cationic surfactants

et al. 2017

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“…The main objective of the present work was to show that MV is a simple and convenient technique for studying one of the most important characteristics of homologous series of surfactants, namely, the dependence of the micellar properties on the chain length of the hydrophobic tail. In addition to the results of the present study, therefore, we included the data on C 16 MeABr that we previously obtained by the same technique …”

Section: Resultsmentioning

confidence: 99%

“…Recently, we applied MV to study the micellar properties of C 16 Me 3 ABr, as well as the effects of KBr on the aggregates formed . We have now extended this study to other members of this class of surfactants, namely, C 10 Me 3 ABr, C 12 Me 3 ABr, and C 14 Me 3 ABr.…”

Section: Introductionmentioning

confidence: 99%

“…Micellar self-diffusion coefficients, D mic , have been obtained by electrochemical techniques through the use of micelle-solubilized electroactive probes, such as ferrocene (Supporting Information). − Additionally, these techniques yield information on the hydrodynamic radius, R H ; the aggregation number, N agg ; and interparticle interactions in micellar solution. Microelectrode voltammetry, MV, is attractive because the measurements are obtained under steady-state conditions in quiescent solutions. − Although hydrodynamic techniques, such as rotating-electrode voltammetry, yield similar information, the micellar geometry can be significantly influenced by forced convection, and if this occurs, it adversely affects the experimental results.…”

Section: Introductionmentioning

confidence: 99%

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Application of Microelectrode Voltammetry to Study the Properties of Surfactant Solutions: Alkyltrimethylammonium Bromides

et al. 2009

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Microelectrode cyclic voltammetry (MV) has been employed to investigate the micellar properties of solutions of homologous alkyltrimethylammonium bromides, RMe(3)ABr, R = C(10), C(12), and C(14), in water and in the presence of added NaBr. The micellar self-diffusion coefficient was calculated from the limiting current for the reversible electron transfer of micelle-bound ferrocene. From the values of this property, other parameters were calculated, including the micellar hydrodynamic radius, R(H), and aggregation number, N(agg); the latter was also theoretically calculated. We determined the values of the diffusion coefficient as a function of various experimental variables and observed the following trends: The diffusion coefficient decreases as a function of increasing surfactant concentration (no additional electrolyte added); it decreases as a function of increasing surfactant concentration at fixed NaBr concentration; and it shows a complex dependence (increase then decrease) on the NaBr concentration at a fixed RMe(3)ABr concentration. The value of the intermicellar interaction parameter decreases and then increases as a function of increasing NaBr concentration. These results are discussed in terms of intermicellar interactions and the effect of NaBr on the micellar surface charge density and sphere-to-rod geometry change. The NaBr concentration required to induce the latter change increases rapidly as a function of decreasing the length of R: no geometry change was detected for C(10)Me(3)ABr. Values of N(agg) increase as a function of increasing the length of R and are in good agreement with both literature values and values that were calculated theoretically. Thus, MV is a convenient and simple technique for obtaining fundamental properties of surfactant solutions, including additive-induced changes of micellar parameters (N(agg)) and morphology changes.

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“…There are reports on the direct use of an electroactive probe’s peak current to determine the diffusion coefficients and, consequently, the sizes of the aggregates. − However, this method is not applicable for our system due to the high diversity of the species in the solution, which makes it impossible to determine the exact contribution of each species to the total peak current. Thus, we have to confine ourselves to only tracking the formation of aggregates by following the reduction peak current of tartrazine, which is proportional to the mean diffusion coefficient.…”

Section: Resultsmentioning

confidence: 99%

Comprehensive Study of Tartrazine/Cationic Surfactant Interaction

Shahir

Javadian

Razavizadeh³

et al. 2011

J. Phys. Chem. B

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Interaction of a food dye, tartrazine, with some cationic conventional and gemini surfactants, tetradecyltrimethylammonium bromide (TTAB), N,N'-ditetradecyl-N,N,N',N'-tetramethyl-N,N'-butanediyl-diammonium dibromide (14,4,14), and N,N'-didodecyl-N,N,N',N'-tetramethyl-N,N'-butanediyl-diammonium dibromide (12,4,12), were first investigated comprehensively employing conductometry, tensiometry, and UV-visible spectroscopy. Tartrazine was found to behave in the same manner as aromatic counterions. The formation of ion pairs reflected as a considerable increase of the surfactant efficiency in tensiometry plots and their stoichiometry were determined by Job's method of continuous variations. For the tartrazine/TTAB system, nonionic DS(3), ionic DS(2-), and/or DS(2)(-) ion pairs, their small premicelles, and tartrazine-rich micelles were constituted as well as dye-containing TTAB-rich micelles. Insoluble J-aggregates of DS(-) ion pairs and cylindrical surfactant-rich micelles were also formed in tartrazine/gemini surfactant systems and recognized by transmission electron microscopy. The zeta potential and the size of the aggregates were determined using dynamic light scattering and confirmed the suggested models for the processes happening in each system. Cyclic voltammetry was applied successfully to track all of these species using tartrazine's own reduction peak current for the first time.

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Effects of KBr and n-decanol on the properties of cetyltrimethylammonium bromide micelles in aqueous solutions: A microelectrode voltammetric study

Cited by 9 publications

References 39 publications

Drug induced micelle-to-vesicle transition in aqueous solutions of cationic surfactants

Drug induced micelle-to-vesicle transition in aqueous solutions of cationic surfactants

Application of Microelectrode Voltammetry to Study the Properties of Surfactant Solutions: Alkyltrimethylammonium Bromides

Comprehensive Study of Tartrazine/Cationic Surfactant Interaction

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