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Effects of flow-selectivity on self-assembly and auto-organization processes: an example.

Alessandro Sorrenti¹, Zoubir El-Hachemi, Joaquim Crusats

¹Department of Organic Chemistry and Institute of Cosmos Science (ICC), Universitat de Barcelona (IECC-UB), c. Martí i Franquès 1, E- 08028-Barcelona Catalonia, Spain. asorrenti@ub.edu jmribo@ub.edu

Chemical Communications (Cambridge, England)

|July 5, 2011

Summary

The way H(4)TPPF(5)S(3) molecules self-assemble into J-aggregates depends on stirring method. Vortex stirring prevents cluster aggregation by limiting molecule movement.

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Area of Science:

Supramolecular Chemistry
Materials Science

Background:

H(4)TPPF(5)S(3) is a molecule known to form aggregates.
The process of homoassociation is crucial for material properties.

Purpose of the Study:

To investigate how different stirring methods affect the homoassociation of H(4)TPPF(5)S(3).
To understand the mechanisms of J-aggregate formation under varying solution dynamics.

Main Methods:

Solution-based self-assembly experiments.
Comparison of J-aggregate formation under shaking (homogenization) versus magnetic stirring in a square-section flask.
Analysis of the impact of vortex stirring and laminar flow generation on aggregation.

Main Results:

Homoassociation of H(4)TPPF(5)S(3) yields distinct J-aggregates based on the method used (shaking vs. magnetic stirring).
Vortex stirring, induced by laminar flows, reduces lateral diffusion.
This reduction in diffusion inhibits cluster-to-cluster aggregation mechanisms.

Conclusions:

Solution dynamics, specifically stirring method, significantly influence the self-assembly of H(4)TPPF(5)S(3) into J-aggregates.
Vortex stirring provides a method to control aggregation by limiting molecular diffusion.