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Surface Chemical Properties and Micellization of Disodium Hexadecyl Diphenyl Ether Disulfonate in Aqueous Solution
Author(s) -
Xu Hujun,
Xu Kai,
Wang Danping
Publication year - 2015
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 - 10.1007/s11743-015-1741-3
Subject(s) - chemistry , critical micelle concentration , surface tension , pulmonary surfactant , aqueous solution , gibbs isotherm , pyrene , adsorption , ether , thermodynamics of micellization , aggregation number , chromatography , nuclear chemistry , inorganic chemistry , micelle , organic chemistry , biochemistry , physics , quantum mechanics
The surface tension of disodium hexadecyl diphenyl ether disulfonate (C 16 ‐MADS) was measured at different NaCl concentrations (0.00–0.50 mol L −1 ) and temperatures (298.0–318.0 K) using the drop‐volume method. The results show that, with increasing temperature, the critical micelle concentration (CMC) of C 16 ‐MADS increases slightly, but the maximum surface adsorption capacity ( Γ max ) at the air–water interface decreases. When the concentration of NaCl was increased from 0.00 to 0.50 mol L −1 , the CMC of C 16 ‐MADS decreased from 1.45 × 10 −4 to 4.10 × 10 −5 mol L −1 , but the surface tension at the CMC ( γ cmc ) was not affected. When the concentration of NaCl was increased at 298.0 and 303.0 K, the Γ max of C 16 ‐MADS increased. When the temperature was increased from 308.0 to 318.0 K, the surface excess concentration ( Γ max ) of C 16 ‐MADS abnormally decreased from 2.26 to 1.41 μmol m −2 with increasing NaCl concentration. The micellization free energy ( Δ G m ∘ ) decreased from −63.98 to −76.20 kJ mol −1 with increase of temperature and NaCl concentration. The micellar aggregation number ( N m ) of disodium hexadecyl diphenyl ether disulfonate (C 16 ‐MADS) was determined using the molecule fluorescence probe method with pyrene as probe and benzophenone as quencher. The results show that an appropriate N m could be measured only at surfactant concentration above the CMC. The N m increased with an increase in C 16 ‐MADS concentration, but the micropolarity in the micelle nucleus decreased. The temperature had little effect on N m . Compared with typical single hydrophilic headgroup surfactants, aggregates of C 16 ‐MADS exhibit different properties.