摘要
表面活性剂的一个重要性质是能显著地降低水的表面张力。溶液的表面张力随表面活性剂浓度的增加而急剧下降,待浓度大到一定值后,表面张力几乎不再改变,从而可确定表面活性剂的临界胶束浓度。文章用最大泡压法测表面活性剂十六烷三甲基溴化铵(CTAB)水溶液的表面张力,进而确定其临界胶束浓度。测定无机盐存在的情况下,十六烷三甲基溴化铵的临界胶束浓度的变化规律。无机盐(NaClNa2SO4Na3PO4)能显著降低临界胶束浓度。此法装置简单,测定迅速,被广泛应用。
Reducing the surface tension of water obviously is a important nature of surface activated reagent.With the cncentration of surface activated reagent increasing, the surface tension reduce obviously.When the cncentration is enough, the surface tension do not change hardly.So the CMC of surface activated reagent is known. The surface tension of aqueous solution cetyltrimethylammonium bromide(CTAB) is determined in this paper by maximum bubble pressure. And determine the change of CMC when salts is exist. Salts(NaCl, Na2 SO4, Na3 PO4) can reduce the CMC of surface activated reagent remarkably. This method is used widely. Because the equipment is simple,determination is quickly.
作者
付俊华
FU Junhua(Henan Zhongyuan Petrochemical Engineering corp.Ld.,Puyang 457000,China)
