Alkyl chain length-dependent viscoelastic properties in aqueous wormlike micellar solutions of anionic gemini surfactants with an azobenzene spacer

作者：Song, Binglei; Hu, Yufang; Song, Yongming; Zhao, Jianxi^*

来源：Journal of Colloid and Interface Science, 2010, 341(1): 94-100.

DOI：10.1016/j.jcis.2009.09.023

• Anionic gemini surfactants
• Azobenzene spacer
• Wormlike micelle
• Viscoelastic properties
• Alkyl chain-length dependence

A homologue of carboxylate gemini surfactants with an azobenzene spacer and different lengths of the alkyl tails, referred to as C-m(azo)C-m, has been synthesized. All the surfactants formed wormlike micelles at relatively low concentrations without addition of salt. The reason was attributed to the long and rigid characteristic of the azobenzene spacer, which yielded the pseudo volume between the two tails and thus a columnar-like molecular geometry for the formation of wormlike micelles. The results of rheology and FF-TEM measurements showed that the length of the alkyl tails strongly affected the viscoelastic properties of the wormlike micelle Solution. With the increase of the alkyl tail length, the solutions evolved from a typically Viscous fluid to a strong viscoelastic solution and then to a get-like state. This was attributed to the different microstates as revealed by scaling law, These solutions behave as polyelectrolyte systems because of their additive-free nature.

• 出版日期2010-1-1
• 单位福州大学; 东北林业大学