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Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
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Related Experiment Video

Updated: Mar 2, 2026

Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device
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CO2-Switchable microemulsion based on a pseudogemini surfactant.

Dongfang Liu1, Yuxin Suo, Jiang Tan

  • 1College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China. hshlu@swpu.edu.cn.

Soft Matter
|May 9, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces a novel CO2-responsive microemulsion using N,N,N

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Area of Science:

  • Stimuli-responsive materials science
  • Supramolecular chemistry
  • Colloid and interface science

Background:

  • Stimuli-responsive surfactants are gaining research interest globally.
  • Tertiary amines and anionic surfactants can form responsive systems.
  • Microemulsions offer tunable properties for various applications.

Purpose of the Study:

  • To develop and characterize a microemulsion responsive to carbon dioxide.
  • To investigate the formation and disassembly of a pseudogemini surfactant.
  • To demonstrate the reversible phase transition of the microemulsion system.

Main Methods:

  • Preparation of a microemulsion using N,N,N',N'-tetramethyl-1,3-propanediamine (TMPDA) and sodium dodecyl sulphate (SDS).
  • Introduction of CO2 to protonate TMPDA, forming a pseudogemini surfactant (SDS-TMPDA-SDS) and inducing microemulsion breakdown.
  • Introduction of N2 at 50 °C to reverse the process, regenerating TMPDA and SDS and recovering the microemulsion.

Main Results:

  • A microemulsion system exhibiting reversible CO2-induced phase transitions was successfully prepared.
  • Protonation of TMPDA by CO2 led to the formation of SDS-TMPDA-SDS, causing microemulsion destabilization.
  • Nitrogen bubbling reversed the system, restoring the initial microemulsion state, demonstrating reversibility over multiple cycles.

Conclusions:

  • The developed microemulsion demonstrates effective and reversible carbon dioxide responsiveness.
  • The formation and disassembly of the pseudogemini surfactant are key to the observed phase transitions.
  • This system holds potential for applications requiring tunable phase behavior triggered by CO2.