DTAB降低饱和烷烃与水的界面张力的研究

Interfacial Tension between Alkyl and DTAB Solution

判断一种表面活性剂降低油-水界面张力性能的优劣,就需要对界面张力进行准确有效的测量。文章就不同浓度的十二烷基三甲基溴化铵(DTAB)水溶液分别与正庚烷(n-Heptane)和正十六烷(n-Hexadecane)之间的界面张力进行定量的测量,分别得到了在30℃下水-正庚烷和水-正十六烷体系的界面张力随DTAB浓度变化的曲线。结果表明,在DTAB浓度达到其所在体系中的CMC值时,水-正庚烷体系界面张力小于水-十六烷体系界面张力。DTAB具有较强的抗矿盐能力,界面张力随温度升高有所下降。

Interfacial tension should be tested to know whether a surfactant is good or not. The interfacial tensions of water/n-heptane and water/n-hexadecane with DTAB were tested. The curves of oil-water interfacial tension under 30℃ were also plotted. It shows that the interracial tension of water-hexadecane system is much lower than that without DTAB. The experiments show that the interfacial tension of water/n-heptane is lower than water/n-hexadecane when the concentration of DTAB is as high as the CMC. The results show that interfacial tensions of alkyl/water go down when temperature goes up, and DTAB also has a good interfacial activity in salt solution.