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Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device
Published on: March 18, 2020
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Aggregation of Mixed (Cationic + Anionic) and (Cationic + Nonionic) Surfactant Systems within a (Lanthanide
1Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
Summary
Deep eutectic solvents (DESs) effectively facilitate mixed surfactant aggregation. These novel media promote spontaneous, entropically driven self-assembly of cationic, anionic, and nonionic surfactants, expanding their application potential.
Area of Science:
- Supramolecular Chemistry
- Materials Science
- Physical Chemistry
Background:
- Deep eutectic solvents (DESs) are versatile media for molecular aggregation.
- Surfactant self-assembly is crucial in various chemical processes.
- Understanding mixed surfactant behavior in novel solvents is essential.
Purpose of the Study:
- Investigate the self-aggregation of mixed surfactants in a lanthanum nitrate-urea DES.
- Determine the effect of the DES on critical aggregation concentrations (CACs) and interactions.
- Characterize the thermodynamic driving forces and aggregation numbers.
Main Methods:
- Utilized a lanthanum nitrate-urea (La:U) DES as the solvent medium.
- Studied mixtures of N-dodecyltrimethylammonium bromide (DTAB) with sodium dodecyl sulfate (SDS) or Triton X-100 (TX-100).
- Employed fluorescence spectroscopy to determine aggregation numbers and microenvironment properties.
Main Results:
- Surfactant mixtures readily self-aggregate in the (La:U) DES across all compositions.
- DES screens surfactant headgroup charges, influencing CACs and interactions (negative β).
- Aggregation is spontaneous, predominantly entropically driven, with significant attractive interactions.
Conclusions:
- The (La:U) DES is an effective medium for mixed surfactant aggregation.
- This study expands the application potential of polar DESs as alternative solvents.
- Findings provide insights into surfactant behavior in non-aqueous environments.
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