Probing structure-nanoaggregation relations of polyaromatic surfactants: a molecular dynamics simulation and dynamic...

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Physical Chemistry

Background:

• Perylene bisimide (PA) surfactants are crucial in self-assembly studies.
• Understanding structure-nanoaggregation relationships is key for designing advanced materials.

Purpose of the Study:

• To investigate how structural variations in PA surfactant side chains influence nanoaggregate formation.
• To explore the role of solvent properties on PA surfactant aggregation dynamics.

Main Methods:

• Molecular dynamics simulations were employed to model PA surfactant behavior.
• Dynamic light scattering experiments were conducted to validate simulation results.
• Analysis of radial distribution functions and solvent accessible surface area to accessible volume (SASA:AV) ratios.

Main Results:

• Aggregate size and dynamics varied significantly with side chain structure and solvent polarity.
• Aromatic solvents like toluene hindered π-π stacking compared to aliphatic solvents like heptane.
• Side chain structure influenced the SASA:AV ratio, affecting aggregate morphology.
• PA surfactants with aliphatic functional groups in both side chains showed steric hindrance, preventing T-stacking.

Conclusions:

• Molecular aggregation of PA surfactants is controllable by tuning side chain substituents and solvent properties.
• Intermolecular interactions, rather than self-diffusivity, are primarily influenced by side chain modifications.
• These findings offer insights into designing self-assembled nanostructures with tailored properties.