Colloid and Polymer Science

, Volume 297, Issue 4, pp 571–586 | Cite as

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

  • Yu Sun
  • Xiaoqing Xu
  • Mengyi Qin
  • Nanjiong Pang
  • Guowei WangEmail author
  • Linghua ZhuangEmail author
Original Contribution


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


Surface-active ionic liquid Gelatin Critical micelle concentration Thermodynamic parameters DFT molecular simulation 



Ionic liquids


Surface-active ionic liquid


1-Allyl-3-methylimidazolium chloride


1-Butyl-3-methylimidazolium chloride


1-Ethyl-3-methylimidazolium chloride


3-Methyl-1-ethoxycarbonylimidazolium chloride


1-Allyl-3-methylimidazolium dodecyl sulfate


1-Butyl-3-methylimidazolium dodecyl sulfate


1-Ethyl-3-methylimidazolium dodecyl sulfate


3-Methyl-1-ethoxycarbonylimidazolium dodecyl sulfate


Triplepeptide (Gly-Pro-Hyp)


Density functional theory


Minimum surface area per molecule


Critical micelle concentration


Surface tension at critical micelle concentration


Maximum surface excess

β value

Degree of counterion binding to micelles

\( \varDelta {G}_{ads}^0 \)

Gibbs free energy of adsorption

\( \varDelta {G}_m^0 \)

Gibbs free energy change of micellization

\( \varDelta {H}_m^o \)

Standard enthalpy change of micellization

\( \varDelta {S}_m^o \)

Standard entropy change of micellization


H-Nuclear magnetic resonance



This work was financed by National Natural Science Foundation of China (No. 21706127) and Natural Science Foundation of Jiangsu Province (BK20140939), which were granted to Linghua Zhuang. The authors also gratefully appreciated the support from National/Jiangsu Students Innovation and Entrepreneurship Training Program (Nos. 201710291015, 201710291016, 2018DC661) and Postgraduate Research & Practice Innovation Program of Jiangsu Province (SJCX18-0345).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

396_2019_4473_MOESM1_ESM.doc (241 kb)
ESM 1 (DOC 241 kb)


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.College of Food Science and Light IndustryNanjing Tech UniversityNanjingChina
  2. 2.College of Biotechnology and Pharmaceutical EngineeringNanjing Tech UniversityNanjingChina
  3. 3.College of Chemistry and Molecular EngineeringNanjing Tech UniversityNanjingChina

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