Matsubara Hiroki, Nakano Takayuki, Matsuda Takashi, Takiue Takanori, Aratono Makoto
Department of Chemistry, Faculty of Science, Kyushu University, Fukuoka 812-8581, Japan.
Langmuir. 2005 Aug 30;21(18):8131-7. doi: 10.1021/la0508543.
The surface tensions (gamma) of the aqueous solutions of tetradecyltrimethylammonium bromide (TTAB) and dodecyltrimethylammonium bromide (DTAB) were measured as a function of the total molality of surfactants (m) and the relative proportion (composition) of DTAB (X(2)) at 298.15 +/- 0.05 K under atmospheric pressure. The effect of the difference in the hydrophobic chain length between hexadecyltrimethylammonium bromide (HTAB) and DTAB on the synergism was examined. This synergism was observed in the miscibility at the surface of a mixture of these two compounds. The excess Gibbs energy of adsorption of the TTAB-DTAB system was positive in contrast to the HTAB-DTAB system. This indicates that there are certain restrictions on the difference in the hydrophobic chain length for the synergism to be brought about in homologous cationic surfactant mixtures. This mechanism was explained by the theory of a staggered structure formation at the air/water interface. A similar argument successfully applied to the hexadecyltrimethylammonium chloride (HTAC)-dodecyltrimethylammonium chloride (DTAC) and tetradecyltrimethylammonium chloride (TTAC)-DTAC mixtures also.
在298.15±0.05 K和大气压下，测量了十四烷基三甲基溴化铵（TTAB）和十二烷基三甲基溴化铵（DTAB）水溶液的表面张力（γ），其作为表面活性剂总质量摩尔浓度（m）和DTAB相对比例（组成）（X(2)）的函数。研究了十六烷基三甲基溴化铵（HTAB）和DTAB之间疏水链长度差异对协同作用的影响。在这两种化合物混合物的表面混溶性中观察到了这种协同作用。与HTAB-DTAB体系相反，TTAB-DTAB体系的过量吸附吉布斯自由能为正。这表明，对于在同系阳离子表面活性剂混合物中产生协同作用，疏水链长度的差异存在一定限制。这种机理通过气/水界面处交错结构形成理论进行了解释。类似的观点也成功应用于十六烷基三甲基氯化铵（HTAC）-十二烷基三甲基氯化铵（DTAC）和十四烷基三甲基氯化铵（TTAC）-DTAC混合物。
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