Conductometric and fluorometric investigations on the mixed micellar systems of cationic surfactants in aqueous media

Moore, Sarah; Mohareb, Michael; Moore, Stephanie A.; Palepu, R.

doi:10.1016/j.jcis.2006.09.019

Cited by 26 publications

(19 citation statements)

References 31 publications

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“…The CMC values obtained from the conductivity method are in good agreement with the surface tension and fluorescence methods. The experimental CMC values are in close agreement with published literature data [24,28,[37][38][39][40]54]. It is observed that an increase in the amount of EG and DEG increases the degree of ionization for all the studied surfactants.…”

Section: Cetyldimethylethanolammonium Bromide (Cdmeab)supporting

confidence: 90%

Effect of Polar Organic Solvents on Self‐Aggregation of Some Cationic Monomeric and Dimeric Surfactants

Sinha

Kumar

Lakra

et al. 2015

J Surfact & Detergents

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Surface and micellization behavior of some cationic monomeric surfactants, viz., cetyldiethylethanolammonium bromide (CDEEAB), cetyldimethylethanolammonium bromide (CDMEAB), tetradecyldiethylethanolammonium bromide (TDEEAB) and dimeric surfactants, i.e., alkanediyl-a, x-bis(dimethylhexadecylammonium bromide) (C 16 -s-C 16 , 2Br -where s = 4, 12), butanediyl-1,4-bis(dimethyldodecylammonium bromide (C 12 -4-C 12 , 2Br -) and 2-butanol-1,4-bis(dimethyldodecylammonium bromide) (C 12 -4(OH)-C 12 , 2Br -), was studied in water-organic solvents [10 and 20 % v/v ethylene glycol (EG) and diethylene glycol (DEG)] by conductivity, surface tension and steady-state fluorescence methods at 300 K. The main focus of the present work is on the study of the effect of organic solvents on the critical micelle concentration (CMC), Gibbs free energy of micellization (DG°m), Gibbs free energy of transfer (DG°t rans ), Gibbs adsorption energy (DG°a ds ) and some interfacial parameters such as the surface excess concentration (C max ), minimum area per surfactant molecule (A min ) and surface pressure (p CMC ). The aggregation number (N agg ) and SternVolmer quenching constant (K SV ) were also determined by the steady-state fluorescence method. It was observed that N agg decreased with increasing volume percent of organic solvent. The results exhibited an increase in CMC in waterorganic solvents as compared to the respective surfactants in pure water. The negative values of DG°m and DG°a ds indicate a spontaneous micellization process. The thermodynamics of micellization revealed that the micellizationreducing efficiency of glycols increases with the concentration and the number of ethereal oxygens in the glycol.

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Section: Cetyldimethylethanolammonium Bromide (Cdmeab)supporting

confidence: 90%

Effect of Polar Organic Solvents on Self‐Aggregation of Some Cationic Monomeric and Dimeric Surfactants

Sinha

Kumar

Lakra

et al. 2015

J Surfact & Detergents

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“…The activity coefficients (c i ) of each component have been calculated by using the nonideal mixed micelle model [17,18]. The calculated c 1 values are plotted against the values of a 1 in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The solubilized n-butanol molecules in the palisade region of a mixed micelle shields the attraction between the head groups of two surfactants so that the b value changes with the n-butanol concentration. For the binary mixtures, the excess enthalpy of mixing (DH mix ) in a mixed micelle can be calculated with the values of b and X i [16][17][18][19]. The calculated DH mix values for each system are changing a little with the value of a 1 for each system as much as do the b values.…”

Section: Resultsmentioning

confidence: 99%

Mixed Micellization of Sodium Dodecylbenzene Sulfonate with Polyoxyethylene Lauryl Ether Surfactants (POLE4 and POLE23) in n‐Butanol Aqueous Solution

Park

Lee

2011

J Surfact & Detergents

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The values of critical micelle concentration and counterion binding constant for the mixed micellizations of sodium dodecylbenzenesulfonate (DBS) with polyoxyethylene(4) lauryl ether (POLE4) and polyoxyethylene(23) lauryl ether (POLE23) in aqueous solution of n-butanol at 25°C were determined as a function of the overall mole fraction of DBS by using the electric conductivity and the surface tension methods. Various thermodynamic parameters were calculated and analyzed for the mixed micellization of DBS/POLE4 and DBS/POLE23 systems by means of the equations derived from the nonideal mixed micellar model. The results show that DBS/POLE23 mixed system has a greater deviation from the ideal model than DBS/POLE4 mixed system. These deviations of thermodynamic parameters for both mixed systems become greater with the addition and concentration increase of n-butanol.

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“…The results reported for mixtures of alkyltrimethylammonium bromides give positive or negative values of the interaction parameter or excess Gibbs energy [9][10][11][12]. It is also reported that the interaction between surfactants is attractive for other homologous surfactants [9,13]. Some papers suggest attractive and repulsion interactions with changes in the mole fractions of surfactants [14][15][16].…”

Section: Introductionmentioning

confidence: 93%

Unusual behavior of CMC for binary mixtures of alkyltrimethylammonium bromides: Dependence on chain length difference

Akisada

Kuwahara

Koga

et al. 2007

Journal of Colloid and Interface Science

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Conductometric and fluorometric investigations on the mixed micellar systems of cationic surfactants in aqueous media

Cited by 26 publications

References 31 publications

Effect of Polar Organic Solvents on Self‐Aggregation of Some Cationic Monomeric and Dimeric Surfactants

Effect of Polar Organic Solvents on Self‐Aggregation of Some Cationic Monomeric and Dimeric Surfactants

Mixed Micellization of Sodium Dodecylbenzene Sulfonate with Polyoxyethylene Lauryl Ether Surfactants (POLE4 and POLE23) in n‐Butanol Aqueous Solution

Unusual behavior of CMC for binary mixtures of alkyltrimethylammonium bromides: Dependence on chain length difference

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