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Related Experiment Video

Updated: May 2, 2026

A Facile and Efficient Approach for the Production of Reversible Disulfide Cross-linked Micelles
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Redox-switchable microemulsions with efficient phase separation and surfactant recycling.

Shuyu Wang1, Yanjie Xu1, Yinjun Fang2

  • 1Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, PR China.

Journal of Colloid and Interface Science
|June 8, 2024
PubMed
Summary

Redox-switchable microemulsions (MEs) demonstrate efficient demulsification and surfactant recycling. This novel approach enables the recovery of 11-butylselanyl-undecyl sulfate sodium (C4SeC11SO4Na) with over 97% efficiency, paving the way for greener chemical processes.

Keywords:
Efficient phase separationPost-processing of emulsified eluentsRedox-switchable microemulsionSurfactant recycling

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Area of Science:

  • Surfactant chemistry
  • Colloid and interface science
  • Green chemistry and sustainable processes

Background:

  • Switchable microemulsions (MEs) offer adaptive responses to stimuli, crucial for efficient phase separation and surfactant recovery.
  • Key challenges include effectively deactivating surfactant interfacial activity and minimizing their solubility in oil phases for successful recycling.

Purpose of the Study:

  • To develop and characterize redox-switchable microemulsions for efficient phase separation and surfactant regeneration.
  • To investigate the reversible transition of 11-butylselanyl-undecyl sulfate sodium (C4SeC11SO4Na) under redox conditions.
  • To demonstrate the practical application of these switchable MEs in simultaneous oil removal and surfactant recycling.

Main Methods:

  • Fabrication of monophasic MEs using 11-butylselanyl-undecyl sulfate sodium (C4SeC11SO4Na), n-butanol, n-octane, and water via pseudo-ternary phase diagrams.
  • Characterization of ME structure and droplet size using conductivity, dynamic light scattering (DLS), and cryogenic transmission electron microscopy (cryo-TEM).
  • Assessment of redox response through visual observation, DLS, cryo-TEM, nuclear magnetic resonance (NMR), and thin-layer tomography.

Main Results:

  • Reversible redox transition between C4SeC11SO4Na and its oxidized form (C4SeOC11SO4Na) achieved using H2O2 and N2H4.
  • Efficient demulsification and regeneration of C4SeC11SO4Na-based MEs demonstrated under redox control.
  • High recyclability of C4SeC11SO4Na (97.1 ± 0.3%) over five cycles achieved, with treated wastewater meeting environmental standards.

Conclusions:

  • Redox-switchable MEs provide an effective platform for controlled phase separation and surfactant recycling.
  • The developed method enables simultaneous oil removal and surfactant recovery from emulsified effluents.
  • This approach holds significant potential for sustainable industrial applications, reducing waste and improving resource efficiency.