A thermodynamic study of the postmicellar transition of cetyltrimethylammonium bromide in water

Quirion, François; Desnoyers, Jacques E.

doi:10.1016/0021-9797(86)90127-x

Cited by 56 publications

(19 citation statements)

References 25 publications

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“…If the solution is ideal and the partial molar heat capacities Cg(aq), Cg(aq) and Cg(aq) are negligible, the dependence on temperature of C,,(aq) is given by eqn. (2). cprn(a9) = 4 H?…”

Section: Discussionmentioning

confidence: 99%

Differential scanning calorimetric study of n-hexadecyltrimethylammonium chloride in aqueous solutions

Blandamer¹,

Briggs²,

Brown³

et al. 1992

Faraday Trans.

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“…If the solution is ideal and the partial molar heat capacities Cg(aq), Cg(aq) and Cg(aq) are negligible, the dependence on temperature of C,,(aq) is given by eqn. (2). cprn(a9) = 4 H?…”

Section: Discussionmentioning

confidence: 99%

Differential scanning calorimetric study of n-hexadecyltrimethylammonium chloride in aqueous solutions

Blandamer¹,

Briggs²,

Brown³

et al. 1992

Faraday Trans.

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“…This is roughly taken into account here by a constant tangential component of the conductivity which with eq 10 establishes p(r) DJr) = constant (12) or (13) rt D,(r) = u,(r)kT = D -; a < r I b b2 with Ds being the tangential self-diffusion coefficient of the counterions and Db the self-diffusion coefficient of free counterions.…”

Section: N1-11mentioning

confidence: 99%

Counterion contribution to the dielectric spectrum of aqueous solutions of ionic surfactant micelles

Barchini¹,

Pottel²

1994

J. Phys. Chem.

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This paper is concerned with the measurement and interpretation of the dielectric relaxation properties of aqueous ionic surfactant micelle solutions without additional salt. The complex permittivities e of cationic and of anionic micelle solutions of hexadecyltrimethylammonium bromide and sodium dodecyl sulfate, respectively, were determined in the frequency range 1 M H z C v < 3 (partly 30) GHz and for several surfactant concentrations choosen between the first and second cmc. The measurements were performed at 25 OC. The c (v) spectra were evaluated in terms of an empirical spectral function. The characterizing parameters of that function were discussed in terms of the results of a new theoretical approach for the dynamics of the layer of bound counterions.The proposed model provides information about the degree of dissociation, effective size of the micelles, and mobility of the counterions.

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“…11 Transitions from cylinders to vesicle were observed for lecithin-bile salt mixed systems when reducing the bile salt contents. 12 These type of changes can also be induced at constant surfactant concentration by increasing the ionic strength of the water medium, [13][14][15] by the presence of cosurfactants in the system 16 or also by changing temperature. 11 The critical micellar concentration corresponds to the transition between single dispersed surfactant molecules to spherical aggregates.…”

Section: Introductionmentioning

confidence: 99%

Unconventional vesicle-to-ribbon transition behaviour of diacyl glycerol amino acid based surfactants in extremely diluted systems induced by pH-concentration effects

Pinazo

Pérez

Infante

2004

Phys. Chem. Chem. Phys.

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A vesicle-to-ribbon transition has been observed in extremely dilute 1-O-(L-arginyl)-2, 3-O-di-decanoyl-snglycerol dichlorohydrate (1010R) surfactant systems by means of static light scattering. At concentration as low as 0.005 mM the solutions scattered significantly. From the angular dependence and molecular weight of the aggregates a vesicular structure is suggested. Increasing surfactant concentration in water induces the vesicle-toribbon transition at concentrations as low as 0.5 mM. This transition is accompanied by a strong decrease of scattered intensity and change in angular dependence. Lowering the pH at a fixed concentration can induce the same transition. Both parameters change the protonation of the surfactant, inducing an increase in preferred surfactant head-group area. Those findings are congruent with the observed surface tension behaviour as a function of surfactant concentration and suggests an explanation for the widely different critical micellar concentration (c.m.c.) as determined by different techniques.

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A thermodynamic study of the postmicellar transition of cetyltrimethylammonium bromide in water

Cited by 56 publications

References 25 publications

Differential scanning calorimetric study of n-hexadecyltrimethylammonium chloride in aqueous solutions

Differential scanning calorimetric study of n-hexadecyltrimethylammonium chloride in aqueous solutions

Counterion contribution to the dielectric spectrum of aqueous solutions of ionic surfactant micelles

Unconventional vesicle-to-ribbon transition behaviour of diacyl glycerol amino acid based surfactants in extremely diluted systems induced by pH-concentration effects

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