【作者】 王英雄； 李雅娟； 黄旭； 王金本； 王毅琳；

【Author】 Yingxiong Wang, Yajuan Li, Xu Huang, Jinben Wang, and Yilin Wang* Key Laboratory of Colloid and Interface Science, Institute of Chemistry, Chinese Academy of Sciences, 100080, Beijing

【机构】 中国科学院化学研究所胶体与界面重点实验室；

【Abstract】 Three series of zwitterionic surfactants with various of hydrophobic alkyl chain and flexible or rigid spacer have been synthesized. The experiment results indicated that the CMC values of surfactants in series Ⅰ and Ⅲ decrease dramatically with increasing hydrophobic alkyl chain length, while the Cs = –(CH2)6– was the critical length of the spacer for series Ⅱ, where the CMC and surface excess concentration (Γmax) reach the maximum and minimum, respectively. The enthalpies of micelle formation (?Hmic) for series Ⅰ and Ⅲ decrease with the increase of chain length. Especially, the ?Hmic values of series Ⅰ decrease from small positive value to negative value with an increase in the hydrophobic alkyl chain length. In addition, due to the π–π interactions among the adjacent phenyl groups, the surfactant with p–xylyl group as spacer has the largest ?Hmic and the smallest micelle ionization degree (α) in series Ⅱ. DLS results presented that the aggregate sizes of C10C6Tri, C14C8Tri and C14C10Tri change significantly with the surfactant concentration above the CMC, while only small aggregates are formed by series Ⅲ at 10 CMC.更多还原