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Synthesis and Characterization of Supramolecular Colloids
Published on: April 22, 2016
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Thermodynamic perturbation theory for self-assembling mixtures of divalent single patch colloids
Bennett D Marshall1, Walter G Chapman
1Department of Chemical and Biomolecular Engineering, Rice University, 6100 S. Main, Houston, Texas 77005, USA. bennettd1980@gmail.com.
Soft Matter
|June 10, 2014
Summary
This study extends thermodynamic perturbation theory to model binary mixtures of divalent patchy colloids with only unlike-species attractions. The new theory accurately predicts mixture behavior, showing 4-mer rings dominate at low temperatures.
Area of Science:
- Colloid and Interface Science
- Statistical Mechanics
- Physical Chemistry
Background:
- Patchy colloids are model systems for complex fluids.
- Understanding binary mixtures with selective interactions is crucial.
- Existing theories struggle to model divalent patchy colloid mixtures.
Purpose of the Study:
- Extend thermodynamic perturbation theory (TPT) to binary mixtures of divalent patchy colloids.
- Incorporate selective AB attractions, excluding AA and BB interactions.
- Accurately model the formation of chains and rings in these mixtures.
Main Methods:
- Applied Wertheim's two-density formalism for one-site associating fluids.
- Extended TPT to account for divalent bonding and binary mixtures.
- Compared theoretical predictions with Monte Carlo simulation data.
Main Results:
- The extended TPT accurately predicts the structure and thermodynamics of the binary mixture.
- Four-mer rings (two A, two B) were found to dominate at low temperatures.
- Ring formation inhibits extensive polymerization into long chains.
Conclusions:
- The developed theory provides the first accurate model for binary mixtures of divalent patchy colloids with selective attractions.
- The findings offer insights into the self-assembly and phase behavior of synthesized mixtures.
- This work advances the theoretical understanding of complex colloidal systems.
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