Premium
Constructing Gemini‐Like Surfactants with Single‐Chain Surfactant and Dicarboxylic Acid Sodium Salts
Author(s) -
Tang Yongqiang,
Wang Ruijuan,
Wang Yilin
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/s11743-014-1632-z
Subject(s) - chemistry , pulmonary surfactant , micelle , cationic polymerization , bromide , titration , critical micelle concentration , isothermal microcalorimetry , methylene , inorganic chemistry , aqueous solution , hydrogen bond , nuclear chemistry , polymer chemistry , organic chemistry , molecule , biochemistry , physics , quantum mechanics , enthalpy
Construction of gemini‐like surfactants using the cationic single‐chain surfactant cetyltrimethylammonium bromide C 16 H 33 N(CH 3 ) 3 Br 2 (CTAB) and the anionic dicarboxylic acid sodium salt NaOOC(CH 2 ) n ‐2 COONa (C n Na 2 , n = 4, 6, 8, 10, 12) by way of non‐covalent interactions has been investigated by surface tension measurements, hydrogen‐1 nuclear magnetic resonance ( 1 H NMR) spectroscopy and isothermal titration microcalorimetry (ITC). The critical micelle concentrations (cmc) of the CTAB/C n Na 2 mixtures are obviously lower than that of CTAB and strongly depend on the mixing ratio. Moreover, the cmc values of the CTAB/C n Na 2 mixtures decrease gradually with an increasing methylene chain length of C n Na 2 , indicating hydrophobic interaction between the hydrocarbon chains of CTAB and C n Na 2 facilitates micellization of the mixtures. In particular, the ITC curves and 1 H NMR spectra indicate that the binding ratio of CTAB to C n Na 2 , except C 4 Na 2 , is around 2:1, i.e., (CTAB) 2 C n Na 2 . Additionally, CTAB/C n Na 2 mixtures are soluble in a whole molar ratio and concentration ranges have been studied, even at the electrical neutralization point. Therefore, these results reveal that highly soluble gemini‐like surfactants are conveniently constructed with oppositely‐charged cationic single‐chain surfactants and dicarboxylic acid sodiums. In an attempt at improving the performance of surfactants this work provides guidance for choosing additives that form gemini‐like surfactants via an uncomplicated synthesis.