物理化学学报 >> 2005, Vol. 21 >> Issue (11): 1240-1243.doi: 10.3866/PKU.WHXB20051109

研究论文 上一篇    下一篇

十六烷基二苯醚二磺酸钠表面化学性质及胶团化作用

许虎君; 吕春绪; 梁金龙   

  1. 南京理工大学化工学院, 南京 210094; 江南大学化工学院, 江苏 无锡 214036
  • 收稿日期:2005-04-07 修回日期:2005-05-20 发布日期:2005-11-15
  • 通讯作者: 许虎君 E-mail:xu6209@163.com

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 E-mail:xu6209@163.com

摘要: 用滴体积法通过表面张力的测定, 系统地研究了十六烷基二苯醚二磺酸钠(C16-MADS)在不同温度(298.0~318.0 K)和不同NaCl浓度(0~0.50 mol•L-1)下的表面活性. 结果表明, 温度升高使C16-MADS溶液的临界胶束浓度(cmc)略有增大, 表面极限吸附量(Γ)降低. cmc随NaCl浓度的增大从1.45×10-4 mol•L-1降至4.10×10-5 mol•L-1, 但最低表面张力(γcmc)基本不受影响. 在298.0 K与303.0 K时, NaCl浓度的增大, Γ增大; 在308.0、313.0与318.0 K时, NaCl浓度的增大, 出现了Γ从2.27 μmol•m-2降低至1.41 μmol•m-2的“反常”现象. 胶团形成自由能(ΔGm0)随温度和NaCl浓度增加负值增大(-63.98~-76.20 kJ•mol-1), 胶团的形成主要是熵驱动过程.

关键词: 十六烷基二苯醚二磺酸钠, 表面张力, 临界胶团浓度

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