An interrelationship between heat of micelle formation and critical micelle concentration

Moroi, Yoshikiyo; Nishikido, Nagamune; Uehara, Hiromoto; Matuura, Ryôhei

doi:10.1016/0021-9797(75)90228-3

Cited by 104 publications

(44 citation statements)

References 32 publications

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“…At a particular temperature, for the pure aqueous surfactant solutions, CMC values are in the order: SDeS > SDS > STS. The observed CMC values for the pure aqueous surfactant solutions in the temperature range studied are comparable with previously reported [31]. The CMC values for both pure and binary mixed systems increase with increase in temperature in the investigated temperature range except for SDeS with a minimum at 303 K. Such a minimum has been reported earlier for sodium alkylsulphate systems [30].…”

Section: Critical Micelle Concentration (Cmc)supporting

confidence: 91%

“…Recently, various possible combinations of surfactants are being studied [19][20][21][22]. However, systematic studies on the effect of temperature on micellization properties of mixed surfactants have been neglected, though there are many reported works [23][24][25][26][27][28][29][30][31][32][33][34][35] with regard to temperature effect on the micellization properties of single surfactant systems. Further, amongst the different types of surfactants studied, sodium alkylsulphate surfactants have been most extensively investigated.…”

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confidence: 99%

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Effect of Temperature on Micellization Properties of Binary Mixtures of Sodium Tetradecylsulphate with Sodium Decylsulphate and Sodium Dodecylsulphate in Water

Singh¹

2017

Asian J. Chem.

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INTRODUCTIONSurface-active agents usually known as surfactants are found used in various fields. The wide range applicability of surfactants is attributed to their amphiphilic property. It is well known that mixtures of surfactants perform better than single surfactant systems. Therefore, many formulations developed for application in various fields consist of surfactant mixtures. Considering the importance of mixed surfactants systems, many researchers have done investigations on micellization properties of surfactant mixtures [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Recently, various possible combinations of surfactants are being studied [19][20][21][22]. However, systematic studies on the effect of temperature on micellization properties of mixed surfactants have been neglected, though there are many reported works [23][24][25][26][27][28][29][30][31][32][33][34][35] with regard to temperature effect on the micellization properties of single surfactant systems. Further, amongst the different types of surfactants studied, sodium alkylsulphate surfactants have been most extensively investigated. In view of these considerations, three homologues of sodium alkylsulphate viz. sodium decylsulphate (SDeS), sodium dodecylsulphate (SDS) and sodium tetradecylsulphate (STS) were chosen and studied the thermodynamic and micellization properties of the binary mixtures of STS with SDeS and SDS in water medium. Conductance measurements were made at four different temperatures ranging from 298 to 313 K at 5 K intervals to determine the Critical micelle concentration (CMC) values of binary mixtures of sodium tetradecylsulphate (STS) with sodium decylsulphate (SDeS) and sodium dodecylsulphate (SDS) in water have been determined using conductance measurement method at four different temperatures ranging from 298 to 313 K at 5 K intervals. The variation in CMC and counterion binding constant as a function of temperature have been investigated. Mixed micelle composition, activity coefficient of the components and mutual interaction between the components in the mixed micelle in terms of interaction parameter have been estimated using Rubingh's model. Variation of these mixed micellization parameters with temperature has been studied. The surfactant mixtures show attractive interaction between the components, which increases with increase in temperature. Thermodynamic parameters of mixed micellization have also been calculated and observed a linear correlation between the entropy change (∆S°mic) and enthalpy change (∆H°mic). Effect of Temperature on Micellization Properties of Binary Mixtures of Sodium

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Section: Critical Micelle Concentration (Cmc)supporting

confidence: 91%

mentioning

confidence: 99%

Effect of Temperature on Micellization Properties of Binary Mixtures of Sodium Tetradecylsulphate with Sodium Decylsulphate and Sodium Dodecylsulphate in Water

Singh¹

2017

Asian J. Chem.

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“…Enthalpies obtained using the computer program are listed in ∆ mic H°: (i) an endothermic contribution from the headgroups and (ii) an exothermic contribution from the alkyl chains. 9, [42][43][44] For alkylpolyglycol ethers the magnitude of the endothermic contribution of the headgroups depends on the extent to which water is liberated into the bulk solvent upon micellization. As the degree of ethoxylation increases, the hydration and ∆ mic H°increase correspondingly.…”

Section: 40mentioning

confidence: 99%

Thermodynamics of Micellization of Nonionic Saccharide-Based N-Acyl-N-alkylaldosylamine and N-Acyl-N-alkylamino-1-deoxyalditol Surfactants

et al. 1999

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). Thermodynamics of micellization of nonionic saccharide-based N-acyl-N-alkylaldosylamine and Nacyl-N-alkylamino-1-deoxyalditol surfactants. Langmuir, 15(6), 2009Langmuir, 15(6), -2014 https://doi.org/10.1021/la981404w Copyright Other than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons).Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Eight homologous series of nonionic carbohydrate-derived surfactants in which the alkyl chains are linked through N-acylated amine bonds were synthesized, and their critical micelle concentrations (cmc's) and standard enthalpies of micellization were determined using titration microcalorimetry. Gibbs energies of micellization (∆micG°) were calculated from the critical micelle concentrations. N-Acyl-N-alkylaldosylamines (acyl ) acetyl/propionyl, aldosyl ) glucosyl/lactosyl) and N-acyl-N-alkylamino-1-deoxyalditols (acyl ) acetyl/propionyl, alditol ) glucitol/lactitol) with alkyl chain lengths of 8, 10, and 12 carbon atoms show a 10-fold decrease in cmc when the length of the chain is increased by two methylene groups. The enthalpograms for the C8 analogs are more complicated than those for the C10 and C12 analogs. Therefore, the enthalpograms were modeled using a computer-based program which takes account of the nonideal properties of the solutions, yielding enthalpies of micelle formation. Increments in the thermodynamic parameters show satisfactory self-consistency. Each CH2 group contributes -2.4 kJ mol -1 to ∆micH°, ∆micG°-(CH2) is -3.0 kJ mol -1 for each series, and T∆micS°(CH2) is 0.7 kJ mol -1 at 40°C. Although the change in entropy is the main driving force for micellization, the enthalpy of micellization may also contribute significantly to the Gibbs energy of micellization, particularly for longer alkyl chains.

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“…Essa associação é medida através do grau de associação micelar (β mic ) ou do grau de dissociação micelar (α mic = 1 -β mic ) (EVANS & WENNERSTROM, 1999;HUNTER, 1989;MOROI, 1992;MYERS, 1999;ROSEN, 1989 MOROI et al, 1975;ZANA, 1980).…”

Section: Associação De íOns Aos Agregadosunclassified

“…diminui na ordem: , 1968). MOROI et al, 1975;ZANA, 1980).Há várias técnicas disponíveis para a determinação da associação de íons à micela: os eletrodos seletivos de íons (LARSEN & TEPLEY, 1974;ZANA et al, 1981), a condutividade (BUNTON et al, 1977;BUNTON et al, 1979;EVANS, 1956;FRAHM et al, 1980;LIANOS & ZANA, 1983), a supressão de fluorescência LISSI et al, 1984;LISSI et al, 1986; MUZZARELLI et al, 1982;OLEA & LISSI, 1986), métodos espectrofotométricos (BARTET et al, 1980;FERNANDEZ-BOLANOS et al, 1986a;GAMBOA et al, 1981), eletroforese (SEPULVEDA & CORTES, 1985), ou espalhamento de luz (ATHANASSAKIS et al, 1985;BIRESAW et al, 1985;CORTI & DEGIORGIO, 1981;DORSHOW et al, 1982;DORSHOW et al, 1983), entre outros. …”

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Novos tensoativos derivados da 2-D-glucosamina

Bazito¹,

Seoud²

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AgradecimentosEm primeiro lugar e acima de tudo, agradeço a Deus pela minha existência e a de tudo e todos que me cercam.Ao Prof. Omar El Seoud pela orientação e oportunidade proporcionados nesses anos de convívio. Ao Prof. Frank H. Quina (IQ-USP), pelo auxílio nas medidas de fluorescência, e à Profa. Rosângela Itri (Instituto de Física -USP), pela realização das medidas e auxílio na interpretação dos resultados de espalhamento de raios X em baixo ângulo (SAXS).Ao Paulinho, por sua paciência oriental na realização dos experimentos de RMN e dos softwares "caseiros" que tanto agilizaram este trabalho.À Ellen Nogueira, pela ajuda nas medidas de espalhamento de luz e tensões superficiais.Ao pessoal da Central Analítica, da Biblioteca, da Secretaria de Pós-Graduação, do Setor Administrativo e de apoio do IQ-USP, pela paciência e pelo auxílio indispensáveis na realização deste trabalho.Ao CNPq, Capes, Finep e Fapesp, pelo auxílio financeiro proporcionado ao nosso laboratório e ao IQ-USP, sem o que seria impossível a realização deste trabalho.À Fapesp e à Capes, pela bolsa de doutoramento concedida.Ao pessoal do laboratório: Ana, Cesar, Dona Euzita, Erika, Naiara, Paulo, Ricardo, Susana, pelo saudável ambiente de trabalho, companheirismo, sugestões e discussões, ao longo de todo esse tempo.Aos amigos do IQ-USP (e ex-IQ-USP): Fabio, Guilherme, Marcia, Sascha, Shirley, e tantos outros, o meu agradecimento especial, pela amizade constante, apoio nos momentos difíceis, e pelas muitas e muitas risadas que tornaram tudo muito mais fácil. The anionic surfactants were obtained by the acylation of 2-Dglucosamine with acyl chlorides (with 8, 12 and 16 carbons), followed by the methylation of these derivatives with methanol in acidic media, and the sulfation of the methyl glucosides with sulfur trioxide-pyridine complex.The cationic surfactants were obtained by the tosylation of methyl glucosides followed by the quaternization with trimethylamine and exchange of the tosylate contra-ion with chloride ions on an ion exchange resin.These surfactants showed c.m.c. similar to other ionic surfactants with equal hydrophobic chain lengths, but more favorable free energies of transfer of the polar head to the micelle. This fact is attributed to hydrogen bonding between the head groups of the surfactant in the micelle, and the hydrophobicity of the sugar moiety.The micelles of these surfactants showed aggregation numbers larger than those obtained for other surfactants, problably because of head-group attractive interactions.Introdução 1 IntroduçãoOs tensoativos ou surfatantes são moléculas anfifílicas, isto é, que possuem duas regiões de polaridades diferentes: uma polar (ou hidrofílica) e outra apolar (ou hidrofóbica). Isso lhes confere uma grande capacidade de adsorção em interfaces, diminuindo as energias interfaciais, daí seu nome ("surfactant" = "surface active") (ROSEN, 1989 Os zwitteriônicos, devido ao seu baixo poder de irritação à pele e aos olhos, têm tido crescente aplicação em produtos para higiene pessoal (SMITH, 1979...

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An interrelationship between heat of micelle formation and critical micelle concentration

Cited by 104 publications

References 32 publications

Effect of Temperature on Micellization Properties of Binary Mixtures of Sodium Tetradecylsulphate with Sodium Decylsulphate and Sodium Dodecylsulphate in Water

Effect of Temperature on Micellization Properties of Binary Mixtures of Sodium Tetradecylsulphate with Sodium Decylsulphate and Sodium Dodecylsulphate in Water

Thermodynamics of Micellization of Nonionic Saccharide-Based N-Acyl-N-alkylaldosylamine and N-Acyl-N-alkylamino-1-deoxyalditol Surfactants

Novos tensoativos derivados da 2-D-glucosamina

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