Physicochemical Understanding of Self-Aggregation and Microstructure of a Surface-Active Ionic Liquid [C₄mim]...

Area of Science:

• Physical Chemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Limited physicochemical data exists for aqueous mixtures of ionic liquids (ILs) and reverse pluronics.
• Understanding self-aggregation and microstructure is key for novel applications.

Purpose of the Study:

• To investigate the self-aggregation dynamics and microstructure of a specific surface-active IL (SAIL) in the presence of a reverse pluronic (10R5).
• To elucidate the interactions and resulting structures in SAIL/10R5 aqueous mixtures.

Main Methods:

• Isothermal titration calorimetry (ITC)
• High-resolution nuclear magnetic resonance (NMR) spectroscopy (including 2H and 13C NMR)
• Small-angle neutron scattering (SANS)
• Cryo-/freeze-fracture transmission electron microscopy (TEM)

Main Results:

• 10R5 facilitates the aggregation of SAIL, forming mixed aggregates and free SAIL micelles.
• Slow dynamics were observed in aqueous SAIL/10R5 mixtures.
• Globular morphologies were identified for both mixed species and individual components.
• SAIL interacts preferentially with the interfacial region of the assembled SAIL.

Conclusions:

• The formed species are mixed interacted aggregates, not mixed micelles.
• This research enriches the understanding of 10R5/SAIL mixed microheterogeneous systems.
• These systems hold potential for green drug delivery and nanomaterial synthesis templates.