Thermodynamic studies of mixed ionic/nonionic surfactant systems

Journal of Colloid and Interface Science
B M RazavizadehBeheshteh Sohrabi

Abstract

Mixtures of alkyltrimethylammonium bromide (CnTAB, n=12, 14, 16, 18) and Triton X-100 were studied at a range of mole fractions of ionic surfactant per nonionic surfactant. For each mixture, the cmc obtained from surface tension measurements differed from that obtained using potentiometry. The behavior of these mixed-surfactant systems showed three different regions with increasing total surfactant concentration. From the surface tension and potentiometry data, we obtained the free monomer concentration of ionic surfactant (mi), the micellar mole fraction of surfactant (xi), and the degree of dissociation (alpha) of ionic surfactant. We also obtained the free monomer concentration of Triton X-100 (m2) using PFG-NMR technique. A new equation was introduced to evaluate the activity coefficient in the micellar phase. The excess free energy (GE) and the synergetic parameters of mixtures were determined at various mole fractions of CnTAB/Triton X-100. Finally, the complexity of the synergism parameters was investigated.

Citations

Feb 23, 2010·Journal of Molecular Modeling·Niaz Poorgholami-BejarpasiBeheshteh Sohrabi
Sep 15, 2014·Journal of Molecular Graphics & Modelling·Hussein GharibiSoheila Javadian
Apr 18, 2012·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Erina OnoYoshinori Kawase
Oct 8, 2019·The Journal of Physical Chemistry Letters·Ziqi DengMing-De Li
Mar 3, 2007·Environmental Science & Technology·Fu ZhaoSteven J Skerlos

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