Multimerization: closed or open association scenario?

Area of Science:

• Colloid and Surface Chemistry
• Physical Chemistry

Background:

• Traditional models of molecular association,
• open association
• closed association
• often fail to accurately describe complex aggregation processes in solutions.
• Existing models inadequately capture the nuances of multimerization.

Purpose of the Study:

• To demonstrate that realistic multimerization can exhibit mixed features of both open and closed association models.
• To propose a method for characterizing multimerization using micelle size distribution.
• To challenge the routine interpretation of experimental data on micellization.

Main Methods:

• Analysis of theoretical models for molecular association.
• Demonstration of mixed features in living polymerization.
• Development of a method to derive micelle size distribution from mean aggregation number dependence on concentration.

Main Results:

• Realistic multimerization processes can simultaneously display characteristics of both open and closed association.
• Living polymerization may appear to have a critical micelle concentration (CMC), while closed systems may not.
• A method is proposed to derive micelle size distribution from the concentration dependence of the mean aggregation number.

Conclusions:

• Neither classical open nor closed association models fully describe many aggregation processes.
• Detailed micelle size distribution is crucial for understanding equilibrium and dynamic properties.
• A new method allows derivation of micelle size distribution from mean aggregation number, prompting re-evaluation of experimental data interpretation.