Alkane selection as a critical factor in structuring reverse wormlike micelles
Hilda Camila Nascimento Nogueira1, Laura Caetano Escobar da Silva1, Tomás Sigfrido Plivelic2
1Institute of Chemistry UNICAMP Brazil.
Journal of Colloid and Interface Science
|January 18, 2025
Summary
The oil phase
Area of Science:
- Colloid and interface science
- Materials science
Background:
- Reverse wormlike micelles (RWLMs) are dynamic aggregates whose properties are influenced by their surrounding medium.
- Understanding the relationship between solvent properties and micelle structure is crucial for controlling their behavior.
Purpose of the Study:
- To investigate how alkane chain length affects the rheological properties, structure, and morphology of RWLMs.
- To establish a link between solvent cohesive energy density and RWLM characteristics.
Main Methods:
- Rheological analysis
- Small-angle X-ray scattering (SAXS)
- Fourier-transform infrared (FT-IR) spectroscopy
- Cryogenic transmission electron microscopy (cryo-TEM)
Main Results:
- Alkane chain length influences the cross-sectional area and persistence length of RWLMs.
- Higher cohesive energy density alkanes result in narrower aqueous channels within RWLMs.
- A model based on the Hildebrand solubility parameter explains the observed structure-solvent relationship.
Conclusions:
- The cohesive energy density of the oil phase is a key factor in controlling RWLM dimensions.
- Tailoring alkane selection allows for precise control over aqueous channel diameter.
- This offers potential for designing RWLMs for specific applications, such as in confined media.
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