Charge screening wormlike micelles affects extensional relaxation time and noodle formation

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Rheology

Background:

• Dipeptides can self-assemble into functional nanostructures.
• Surfactants form micelles, influencing solution properties.
• Viscosity is a critical parameter in material applications.

Purpose of the Study:

• To investigate the self-assembly of a functionalized dipeptide into wormlike micelles.
• To explore how salt concentration affects micelle structure and interactions.
• To prepare and characterize gel noodles with tunable mechanical properties.

Main Methods:

• High pH treatment to induce dipeptide self-assembly.
• Systematic variation of salt concentration in dipeptide solutions.
• Rheological measurements (shear and extensional viscosity) of the resulting solutions.
• Preparation and mechanical testing of gel noodles.

Main Results:

• The functionalized dipeptide self-assembles into wormlike micelles at high pH.
• Increasing salt concentration modifies micelle aggregation and inter-micelle interactions.
• Significant changes in shear and extensional viscosity were observed with varying salt concentrations.
• Tunable mechanical properties of the resulting gel noodles were achieved.

Conclusions:

• Functionalized dipeptides serve as effective surfactants capable of forming tunable self-assembled structures.
• Salt concentration is a key parameter to control the rheological properties of these dipeptide-based systems.
• The ability to tailor viscosity and mechanical properties opens possibilities for creating advanced gel noodle materials.