Effect of the Nature of the Counterion on the Properties of Anionic Surfactants. 1. Cmc, Ionization Degree at the Cmc and Aggregation Number of Micelles of Sodium, Cesium, Tetramethylammonium, Tetraethylammonium, Tetrapropylammonium, and Tetrabutylammonium Dodecyl Sulfates
作者:Mohamed Benrraou、Barney L. Bales、Raoul Zana
DOI:10.1021/jp021714u
日期:2003.12.1
The surfactants cesium, tetramethylammonium, tetraethylammonium, tetrapropylammonium and tetrabutylammonium dodecyl sulfates (CsDS, TMADS, TEADS, TPADS, and TBADS) have been synthesized by ion-exchange. The critical micellization concentration in the absence of added salt (cmc) has been determined at 10, 25, and 40 °C using the electrical conductivity method. The cmc was found to decrease in the sequence
表面活性剂铯、四甲基铵、四乙基铵、四丙基铵和四丁基铵十二烷基硫酸盐(CsDS、TMADS、TEADS、TPADS 和 TBADS)已通过离子交换合成。使用电导率法在 10、25 和 40 °C 下确定了不加盐 (cmc) 的临界胶束化浓度。发现 cmc 按 CsDS > TMADS > TEADS > TPADS > TBADS 的顺序降低。cmc 的值对温度的影响很小,对于大多数研究的表面活性剂,在 25 °C 左右经历了一个浅的最小值。胶束聚集数已使用时间分辨荧光猝灭法测定,其中芘/十二烷基氯化吡啶鎓作为荧光探针/猝灭剂对,在各种表面活性剂浓度下,在 TMADS 的情况下,在四甲基氯化铵存在下。cmc处的胶束电离度α0由电导率数据和聚集n的值确定...