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Spacer length effect on the aggregation behaviours of gemini surfactants in EAN

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Abstract

As the symbol of gemini surfactants, the spacer group connects two surfactant monomers and plays an important role in the self-assembling of gemini surfactants. Recent attention has been paid to the effects of spacer nature and length in aqueous systems. In this study, the aggregation behaviours of quaternary ammonium gemini surfactants 12-s-12 with different spacer length (s = 2, 3, 4, 5, 6, 8, 10, 12) have been investigated in the protic ionic liquid EAN. The micellization behaviour was characterized by surface tension measurement. With the help of small-angle X-ray scattering (SAXS), the size and shape of aggregates were verified. The spacer length effect could be reflected by the changes in the micellization and phase behaviours of 12-s-12/EAN systems. The critical packing parameter of gemini molecules would decrease monotonically with the spacer length, which is supported by SAXS results. Due to the charge screening effect of EAN, the aggregation behaviours of 12-s-12 would be mainly influenced by spacer length. Our results would be the important supplement to the spacer length effect of gemini surfactants in the nonaqueous systems.

Graphical abstract

With the increase of spacer chain length, the reverse hexagonal lyotropic liquid crystal phase would transform into the micellar phase.

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Funding

The authors received financial supports from the National Natural Science Foundation of China (21703175, 21673129, and 51905158), Xuzhou University of Technology, and the Project National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology (No. 201812).

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Correspondence to Qintang Li or Xiao Chen.

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Li, Q., Wang, X., Zhuang, W. et al. Spacer length effect on the aggregation behaviours of gemini surfactants in EAN. Colloid Polym Sci 299, 685–692 (2021). https://doi.org/10.1007/s00396-020-04795-1

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