Physicochemical studies of the cetyltrimethylammonium bromide micellar system using a bromide selective electrode

Gerakis, Athanasios M.; Koupparis, Michael A.

doi:10.1016/0039-9140(93)e0045-f

Cited by 15 publications

(5 citation statements)

References 18 publications

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“…Silicon amounts varied from zero to 3.00 × 10 −3 mol L −1 (8.40 × 10 −5 in mass fraction). In the absence of silicate, the CMC of CTAB was 1.00 × 10 −3 mol L −1 (3.6 × 10 −4 in mass fraction), in good agreement with the reported values (0.90-1.15 × 10 −3 mol L −1 ) [20][21][22].…”

Section: Dilute Regionsupporting

confidence: 90%

Physical chemistry of nanostructured molecular sieves by the study of phase diagrams: the case of the cetyltrimethylammonium bromide–tetramethylammonium silicate–water system

Albuquerque

Vautier-Giongo

Pastore

2005

Journal of Colloid and Interface Science

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Section: Dilute Regionsupporting

confidence: 90%

Physical chemistry of nanostructured molecular sieves by the study of phase diagrams: the case of the cetyltrimethylammonium bromide–tetramethylammonium silicate–water system

Albuquerque

Vautier-Giongo

Pastore

2005

Journal of Colloid and Interface Science

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“…The authors assumed that K OH/Br for the dimeric micellar solutions investigated was similar to that corresponding to conventional alkyltrimethylammonium bromide surfactants. With this in mind, a value of 0.098 for the ion-exchange equilibrium constant was taken into account [ 25 ]. k 2 w was experimentally obtained, its value being equal to 9.8 × 10 −3 M −1 s −1 at 303 K.…”

Section: Resultsmentioning

confidence: 99%

Study of the Reaction 2-(p-Nitrophenyl)ethyl Bromide + OH− in Dimeric Micellar Solutions

Graciani

Rodrı́guez

Martı́n³

et al. 2011

Molecules

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The dehydrobromination reaction 2-(p-nitrophenyl)ethyl bromide + OH−was investigated in several alkanediyl-α-ω-bis(dodecyldimethylammonium) bromide, 12-s-12,2Br− (with s = 2, 3, 4, 5, 6, 8, 10, 12) micellar solutions, in the presence of NaOH 5 × 10−3 M. The kinetic data were quantitatively rationalized within the whole surfactant concentration range by using an equation based on the pseudophase ion-exchange model and taking the variations in the micellar ionization degree caused by the morphological transitions into account. The agreement between the theoretical and the experimental data was good in all the dimeric micellar media studied, except for the 12-2-12,2Br− micellar solutions. In this case, the strong tendency to micellar growth shown by the 12-2-12,2Br− micelles could be responsible for the lack of accordance. Results showed that the dimeric micelles accelerate the reaction more than two orders of magnitude as compared to water.

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“…The bromide signal reflects differences in the association of the bromide ion with the free surfactant (which may often be neglected) and the micelle, respectively. Analysis of free counterion concentration has previously been used to determine CMCs, as exemplified in the CMC determination of CTAB using a bromide selective electrode [35]. The degree of counterion binding may also be quantified from the bromide signal.…”

Section: Ce-fa Procedures For Determining Cmcsmentioning

confidence: 99%

CE frontal analysis employing contactless conductivity detection for determination of CMCs of non‐UV absorbing charged surfactants

2007

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Micellar systems composed of surfactants are used extensively in academia and industry for many different applications. In this work a highly versatile CE method for determination of CMCs of charged surfactants has been developed. In the case of positively charged surfactants a coating procedure of the fused-silica capillary was used, whereas negatively charged surfactants were analyzed using uncoated capillaries. The CE method is based on frontal analysis (FA) employing use of contactless conductivity and UV detection. The main advantages of the method are that it can be used for non-UV absorbing surfactants without introducing marker compounds which previously has been found to affect CMCs, requires very limited sample volume and is easily implemented and automated using standard CE equipment. The fact that counterions and different aggregated states are separated allows a detailed characterization of the micelle systems using the developed method. In the case of UV absorbing surfactants similar results were obtained employing contactless conductivity and UV detection. Finally, CMCs obtained using conductometry gave similar results as compared to the developed CE-FA procedure.

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Physicochemical studies of the cetyltrimethylammonium bromide micellar system using a bromide selective electrode

Cited by 15 publications

References 18 publications

Physical chemistry of nanostructured molecular sieves by the study of phase diagrams: the case of the cetyltrimethylammonium bromide–tetramethylammonium silicate–water system

Physical chemistry of nanostructured molecular sieves by the study of phase diagrams: the case of the cetyltrimethylammonium bromide–tetramethylammonium silicate–water system

Study of the Reaction 2-(p-Nitrophenyl)ethyl Bromide + OH− in Dimeric Micellar Solutions

CE frontal analysis employing contactless conductivity detection for determination of CMCs of non‐UV absorbing charged surfactants

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