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化学学报
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化学学报 ›› 1964, Vol. 30 ›› Issue (5): 441-451.    下一篇

论文

混合表面活性剂水溶液的表面吸附 I.溴化十二烷基吡啶和硫酸十二烷基鈉的表面吸附

華西苑, 赵国璽   

  1. 北京大学化学系
  • 投稿日期:1963-08-21 修回日期:1964-06-24 发布日期:2013-06-03

SURFACE ADSORPTION OF THE AQUEOUS SOLUTION OF MIXED SURFACTANTS Ⅰ. SURFACE ADSORPTION OF DODECYLPYRIDINIUM BROMIDE AND SODIUM DODECYLSULPHATE

HUA HSI-YUAN, CHAO KUO-HIS   

  1. Department of Chemistry, Peking University
  • Received:1963-08-21 Revised:1964-06-24 Published:2013-06-03

PDF

550

被引次数

8

本工作研究澳化十二烷基呲啶(C12NBr)和硫酸十二烷基钠(NaC12S)两种正、负离子表面活性剂的混合溶液(加入溴化钠作成等离子强度溶液)的表面吸附。用滴体积法测定C12NBr水溶液、等离子强度的、不同C12Br-NaC12S比例的水溶液及1:1当量C12NBr-NaC12S混合溶液的表面张力。利用等离子强度条件下的Gibbs吸附公式-((dγ/dlnmN))mS=RTГ'N及——((dγ/dlnmN))mN=RTГ'S,可分剧求出正、负表面活性离子的吸附量。结果表明:1.负离子表面活性剂之存在大为增加正离子表面活性剂的表面活性;反之亦然。1:1当量C12NBr-NaC12S混合溶液的CMC约为2×10-5m,比C12NBr溶液的CMC约小650倍。2.负离子表面活性剂之存在促进正表面活性离子的表面吸附;反之亦然。这恰好与负、负表面活性离子混合溶液及丁醇-负表面活性离子混合溶液之情形相反。3.加无机盐(NaBr)对1:1当量C12NBr-NaC12S混合溶液的表面张力几无影响,亦即对吸附无显著影响。

Although the surface adsorption of ionic surfactants had been widely studied,the investigations were almost limited to solutions containing only a single surfactant. In the present investigation surface tension of the mixed solutions containing a cationic and an anionic surfactant namely, dodecylpyridinium bromide and sodium dodecylsulfate, has been measured by the drop-volume method, and the individual adsorption of each surface-active ion calculated by the following equations.