Thermodynamic and Interfacial Properties of Cationic Gemini Surfactant in the Presence of Alcohols
Küçük Resim Yok
Tarih
2018
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Carl Hanser Verlag
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The micellar properties of the cationic Gemini surfactant ethanediyl-1,2-bis(dimethyldodecyl ammonium bromide), C12H25 center dot(CH3)(2)N+-(CH2)(2)-N+(CH3)(2)C(12)H(25 center dot)2Br(-) (12-2-12), with short chain alcohols have been studied by conductivity and surface tension measurements within the temperature range 293.15 K-313.15 K and alcohol percentage. The critical micelle concentration (CMC) of 12-2-12 solution, degree of ionization (alpha) and standard Gibbs free energy of micellization (Delta G(m)degrees), standard enthalpy of micellization (Delta H-m degrees) were calculated from conductivity and surface tension data. The experimental data show that the CMC values of cationic Gemini surfactants increased with addition of methanol, ethanol and n-propanol. The thermodynamic parameters (Delta G(m)degrees), (Delta H-m degrees) and (Delta S-m degrees) of micellization of 12-2-12 in alcohol were also calculated from the temperature dependence of the CMC values. CMC, (alpha), (Delta H-m degrees) and (Delta S-m degrees) increased linearly with increasing temperature. In the mixture of dimeric cationic surfactant (12-2-12) and alcohol solutions, the CMC values showed a slight increase with increasing alcohol concentration. CMC, maximum surface excess concentration at the solution/air interface, Gamma(max), minimum area per surfactant molecule, A(min), and the surface pressure at CMC, IICMC, values calculated from the surface tension measurements and thermodynamic parameters have been evaluated at same temperatures.
Açıklama
Anahtar Kelimeler
Cationic Gemini Surfactant, Critical Micelle Concentration, Surface Tension, Conductivity, Micellization Behavior, Mixed Micelles, Tetradecyltrimethylammonium Bromide, Aqueous-Solutions, Free-Energy, Head Group, Fluorescence, Ammonium, Mixtures, Tension
Kaynak
Tenside Surfactants Detergents
WoS Q Değeri
Q4
Scopus Q Değeri
Q3
Cilt
55
Sayı
4
