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Dodecyl sulfate-based anionic surface-active ionic liquids: synthesis, surface properties, and interaction with gelatin

Authors
  • Sun, Yu1
  • Xu, Xiaoqing2
  • Qin, Mengyi1
  • Pang, Nanjiong1
  • Wang, Guowei1
  • Zhuang, Linghua3
  • 1 Nanjing Tech University, College of Food Science and Light Industry, Nanjing, Jiangsu, 211800, China , Nanjing (China)
  • 2 Nanjing Tech University, College of Biotechnology and Pharmaceutical Engineering, Nanjing, Jiangsu, 211800, China , Nanjing (China)
  • 3 Nanjing Tech University, College of Chemistry and Molecular Engineering, Nanjing, Jiangsu, 211800, China , Nanjing (China)
Type
Published Article
Journal
Colloid & Polymer Science
Publisher
Springer-Verlag
Publication Date
Feb 02, 2019
Volume
297
Issue
4
Pages
571–586
Identifiers
DOI: 10.1007/s00396-019-04473-x
Source
Springer Nature
Keywords
License
Yellow

Abstract

Four dodecyl sulfate-based anionic surface-active ionic liquids were synthesized. Physicochemical parameters of surface-active ionic liquids (SAILs) or SAIL/gelatin aqueous solutions were demonstrated. Critical micelle concentration (cmc) values of [Emim][C12H25SO4], [Amim][C12H25SO4], [Bmim][C12H25SO4], and [Etmim][C12H25SO4] were 2.10 mmol/L, 1.95 mmol/L, 0.95 mmol/L, and 0.86 mmol/L at 298.15 K, respectively. cmc values of four SAILs followed the decreasing trend: [Emim][C12H25SO4] ≈ [Amim][C12H25SO4] > [Bmim][C12H25SO4] ≈ [Etmim][C12H25SO4]. The alkyl chain length (ethyl to butyl group) and electron absorption effect (carboxylate ester or allyl group) of substituent in cationic imidazolium groups played important role in micelle formation of SAILs. cmc values of SAIL/gelatin aqueous solutions were lower than those of SAILs. Micelle formation (SAIL or SAIL/gelatin) was spontaneous, exothermic, and entropy-driven. From DFT calculation, typical hydrogen bonds were found between active hydrogen atom of imidazole ring and oxygen, sulfur atoms of sulfate anion group. The information obtained would provide guide for design and synthesis of novel SAILs for wide gelatin application. Graphical abstract

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