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在(25±0.2)℃的实验温度下,通过用表面张力法确定了辛基酚聚氧乙烯醚(10)乙基磺酸钠(OPS)在无机盐氯化物(LiCl,NaCl,KCl,MgCl2,CaCl2,BaCl2,AlCl3,FeCl3和SmCl3)水溶液中的临界胶束浓度(cmc)值,根据cmc值的变化得出无机盐反离子对非离子-阴离子型表面活性剂OPS的cmc值影响规律.实验数据分析表明,虽然非离子-阴离子型表面活性剂OPS分子中增加了一个非离子氧乙烯单元的亲水性基团,但其cmc值和无机盐反离子浓度[M]之间具有与离子型表面活性剂相似的线性关系:lgcmc=-4.242-(0.2980-0.0102Z/r)lg[M]([M]<1mol/L),其中Z和r分别为反离子的价态和范德华原子半径的平均值.无机盐对OPS的cmc的影响具有离子型表面活性剂的性质,不具有非离子型或两性表面活性剂的性质.该关系式亦说明了水溶液中非离子-阴离子型表面活性剂OPS的cmc值与无机盐反离子的浓度、价态和范德华原子半径的平均值有关,反离子对胶束的结合度的大小取决于反离子的价态与范德华原子半径平均值的比值.最后就无机盐反离子对OPS的cmc影响机理进行了简要分析.
The surface tension of the octylphenol ethoxylates (10) sodium ethanesulfonate (OPS) in the presence of inorganic salt chlorides (LiCl, NaCl, KCl, MgCl2 , CMC, CaCl 2, BaCl 2, AlCl 3, FeCl 3 and SmCl 3). The cmc values of inorganic salt counterion on the cmc value of nonionic-anionic surfactant OPS were obtained according to the change of cmc value. Experimental data analysis shows that although a hydrophilic group of non-ionic oxyethylene unit is added to the nonionic-anionic surfactant OPS molecule, the cmc value and the counterion concentration of inorganic salt [M] The similar linear relationship of surfactants: lgcmc = -4.242- (0.2980-0.0102Z / r) lg [M] ([M] <1mol / L), where Z and r are the valences of the counter ions and van der Waals atoms The mean value of the radius The effect of inorganic salts on the cmc of OPS has the property of an ionic surfactant and does not have the property of a nonionic or amphoteric surfactant.The relationship also illustrates the nonionic-anionic surfactant in aqueous solution The cmc value of the agent OPS is related to the concentration of the counterion of the inorganic salt, the valence and the mean value of the van der Waals atomic radius, Size of the combination of ionic micelles depends on the ratio of counterion valence of van der Waals atomic radii of the mean. Finally inorganic counterions influencing mechanism cmc OPS briefly analyzed.