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Temperature Comparative Studies on Self‐Assembly of Sodium Dodecyl Sulphate and Didodecyl Dimethyl Ammonium Bromide in Aqueous, Brine, and Trifluoroethanol Media
Author(s) -
Dey Apensu,
Banik Rajesh,
Ghosh Soumen
Publication year - 2021
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1002/jsde.12385
Subject(s) - chemistry , gibbs free energy , microviscosity , aggregation number , aqueous solution , ammonium bromide , critical micelle concentration , micelle , sodium dodecyl sulfate , enthalpy , standard molar entropy , krafft temperature , thermodynamics , inorganic chemistry , analytical chemistry (journal) , pulmonary surfactant , chromatography , standard enthalpy of formation , biochemistry , physics , membrane
An approach based on experimental and theoretical methods was used to compare the self‐assembly [ i.e ., determination of the critical micelle concentration (CMC), degree of ionization ( α ) and counterion binding ( β )] of sodium dodecyl sulfate (SDS) and didodecyl dimethyl ammonium bromide (DDAB) in deionized water and 10 mM NaCl and 10 (vol) % trifluoroethanol solutions. Experimental methods consisted of electrical conductometry, tensiometry, fluorimetry, and determination of Krafft temperature. A critical analysis of the thermodynamics of self‐assembly by the Gibbs–Helmholtz equation and the van't‐Hoff rationale provided values of several parameters, such as the change of Gibbs free energy and enthalpy change of micellization ( Δ G m 0 and Δ H m 0 , respectively) and the Gibbs free energy of surfactant tail groups (∆ G 0 trans ). Interfacial properties, aggregation number ( N agg ), micropolarity ( I 1 / I 3 ), microviscosity ( η ), packing parameter ( P ), dielectric constant ( D ), anisotropy ( r ), and Stern–Volmer binding constant ( K SV ) for SDS and DDAB in different temperatures and different systems were determined.