Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (11): 1240-1243.doi: 10.3866/PKU.WHXB20051109

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Surfactivity and Micellization of Disodium Hexadecyl Diphenyl Ether Disulfonate in Aqueous Solution

XU Hujun; LÜ Chun-xu; LIANG Jin-long   

  1. School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094; School of Chemical Engineering, Southern Yangtze University, Wuxi 214036
  • Received:2005-04-07 Revised:2005-05-20 Published:2005-11-15
  • Contact: XU Hu-jun

Abstract: By using drop-volume method, the surface tension of disodium hexadecyl diphenyl ether disulfonate (C16-MADS) was measured in different NaCl concentrations (0~0.50 mol•L-1 NaCl) at different temperatures (298.0~318.0 K). The results show that with the increase of temperature, the critical micelle concentration (cmc) of C16-MADS slightly increases, but the maximum surface excess concentration at the air/water interface (Γ) decreases. The cmc of C16-MADS decreases from 1.45×10-4 mol•L-1 down to 4.10×10-5 mol•L-1 as the concentration of NaCl increases from 0 to 0.50 mol•L-1, but the corresponding surface tension at the concentration (γcmc) shows no variation. As the increase of NaCl concentration, Γ of C16-MADS increases as the increase of temperature in the range of 298.0~303.0 K, but abnormally decreases from 2.27 μmol•m-2 down to 1.41 μmol•m-2 in the range of 308.0~318.0 K. The micellization free energies (ΔGm0) are in the range -63.98~-76.20 kJ•mol-1 in the studied ranges of temperature and NaCl concentration. The process of micellization of C16-MADS in aqueous solution is mainly driven by the entropy.

Key words: Disodium hexadecyl diphenyl ether disulfonate, Surface tension, Critical micelle concentration