Micellization of Alkyltriphenylphosphonium Bromides in Ethylene Glycol and Diethylene Glycol + Water Mixtures: Thermodynamic and Kinetic Investigation

Kolay, Sancheeta; Ghosh, Kallol K.; MacDonald, Amy M.; Moulins, Jonathan R.; Palepu, R.

doi:10.1007/s10953-007-9222-6

Cited by 17 publications

(11 citation statements)

References 21 publications

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“…Both EG and DEG are considered water structure breakers that disrupt the hydrogen bond network of water resulting in dehydration of the micellar surface and head groups. Since they form hydrates with water, this should inhibit hydrophobic interactions and cause the CMC to increase [27].…”

Section: Cetyldimethylethanolammonium Bromide (Cdmeab)mentioning

confidence: 99%

“…Ghosh et al [22] studied the temperature and solvophobic effect on the micellization of some cationic gemini surfactants. Addition of polar organic solvents with properties close to those of water, such as ethylene glycol, glycerol and formamide, have been investigated by our research group [27][28][29]. Ethylene glycol (EG) and diethylene glycol (DEG) have been selected as organic solvents because of their resemblance to the properties of water and having the ability to promote micelle formation [17].…”

Section: Introductionmentioning

confidence: 99%

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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)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Sinha

Kumar

Lakra

et al. 2015

J Surfact & Detergents

Self Cite

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“…Decreasing the hydrophobic effect of the surfactant molecules decreases the repulsion between the hydrophobic chains and the surrounded water phase and consequently increases the CMC value, as presented in Table 1 [23].…”

Section: Critical Micelle Concentrationmentioning

confidence: 99%

Interactions of Glycols with Dodecyl Isothiouronium Cationic Surfactant on the Surface Active Parameters

Hefni

Negm

2013

J Surfact & Detergents

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Surface properties of the dodecyl isothiouronium cationic surfactant in a mixed solvent of water and polyethylene glycol of different molecular weights varied from ethylene glycol to polyethylene glycol‐600 were determined using surface tension and conductivity measurements. The results showed an increase in the surface properties including critical micelle concentration, effectiveness and efficiency, compared to the surfactant in pure water as the solvent. The interaction between the cationic surfactant and the glycols was described and the molecular weight of the different glycols was rationalized.

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“…[13,[31][32][33][34][35] Further, fewer reports deal with effect of EG oligomers on thermodynamic parameters of micellization of cationic surfactant (except Gibbs energy of micellization). This motivated us to investigate thermodynamic of micellization process of cationic surfactant in the presence of EG and its oligomers.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Study of a Cationic Surfactant in Aqueous Solution Containing Ethylene Glycol and Its Oligomers: Effect of Number of Ethereal Oxygen Atoms in Glycols Molecule

Chavda

Bahadur

2013

Journal of Dispersion Science and Technology

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Effect of glycols viz., ethylene glycol (EG), diethylene glycol (DEG), triethylene glycol (TEG) and tetraethylene glycol (TeEG) on micellization parameter of cationic surfactant tetradecyletrimethyl ammonium bromide (TTAB) was examined by means electrical conductivity measurements. The critical micelle concentration (CMC), degree of counterion dissociation (a) and Gibbs energy of micellization (DG m ) as well as Gibbs energy of transfer (DG t ) of surfactant tail from bulk phase to micellar phase as a functions glycol concentration at 303.15 K were evaluated. In ordered to obtain enthalpy (DH m ) and entropy (DS m ) of micellization, CMCs were determined in 10.0% of glycols in temperature range from 303.15 K to 323.15 K. Thermodynamic parameters of the micellization reveal that effectiveness of glycols to reduce micellization increases with concentration and with number of ethereal oxygen, [-O-] n in glycol molecule. INTRODUCTIONApplications of surfactants in fields like lubrication or oil-wetting cleaners and detergency require the use of surfactant in either a water-free or water-poor medium. This has stimulated a significant amount of interest towards the micellization of various surfactants in non-aqueous, polar organic media [1,2] and in mixed solvent having a significant amount of a polar solvent mixed with water. [3][4][5][6][7][8][9][10][11][12] Glycols are well known for their use as coolants and antifreezes and find application in pharmaceutical, cosmetics, and food industries. [13] In most these applications, surfactant is also present and, therefore, it is important to study the effect of glycol on micellization of surfactants. The properties of surfactant micelles can change significantly as the polar glycol solvent replaces the water in the system. Also, the addition of glycols to aqueous micellar surfactant solutions provides an opportunity to study the so called solvophobic effect (as opposed to the hydrophobic effect), which is used to describe micellization in polar solvent [3,14] The micellization in these solvents is similar in many aspects to the micellization in water although micellization is not as favorable as in water for given surfactant. [15] There is enormous literature that deals with effect of aqueous ethylene glycol (EG) on micellization of cationic, anionic and nonionic surfactants. [3][4][5][6][7][8][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] From thermodynamic studies of micellization in presence of EG Ruiz [5,6] observed that due to lower cohesive energy of EG þwater mixed solvent system, aggregation number of micelles decreased. For alkyltrimethylammonium bromide surfactant in presence of aqueous EG and glycerol from electrochemical studies using surfactant selective electrode, Palepu and coworkers [3] concluded that logarithm of the critical micellar concentration (CMC) of surfactant is directly proportional to the solvent=water ratio expressed in weight percent. They have also investigate the effect of EG on binary mixtures of alkyltriphenylphosphonium brom...

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Micellization of Alkyltriphenylphosphonium Bromides in Ethylene Glycol and Diethylene Glycol + Water Mixtures: Thermodynamic and Kinetic Investigation

Cited by 17 publications

References 21 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

Interactions of Glycols with Dodecyl Isothiouronium Cationic Surfactant on the Surface Active Parameters

Thermodynamic Study of a Cationic Surfactant in Aqueous Solution Containing Ethylene Glycol and Its Oligomers: Effect of Number of Ethereal Oxygen Atoms in Glycols Molecule

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