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Synthesis and Characterization of Supramolecular Colloids
Published on: April 22, 2016
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Structural Implications on the Properties of Self-Assembling Supramolecular Hosts for Fluorescent Guests
Sicheng Tang1, Bryan Donaphon2, Marcia Levitus2
1Laboratory for Molecular Photonics, Department of Chemistry, University of Miami , 1301 Memorial Drive, Coral Gables, Florida 33146-0431, United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|August 5, 2016
Summary
Amphiphilic macromolecules self-assemble into nanoscale particles for encapsulating hydrophobic guests. Optimal host assembly requires excess hydrophobic components, with a 6:1 ratio ideal for fluorescent probe delivery vehicles.
Area of Science:
- Polymer Chemistry
- Supramolecular Chemistry
- Materials Science
Background:
- Amphiphilic macromolecules are key building blocks for self-assembling nanostructures.
- Controlling the balance of hydrophobic and hydrophilic segments is crucial for predictable self-assembly.
- Designing effective encapsulation systems requires understanding structure-property relationships.
Purpose of the Study:
- To synthesize and characterize amphiphilic macromolecules with varying hydrophobic-to-hydrophilic ratios.
- To investigate the self-assembly behavior of these macromolecules into nanoscale particles.
- To evaluate the encapsulation efficiency of hydrophobic guests and identify optimal structural parameters.
Main Methods:
- Radical copolymerization of methacrylate monomers to create amphiphilic poly(methacrylate) backbones.
- Systematic variation of decyl (hydrophobic) and oligo(ethylene glycol) (hydrophilic) side chain ratios and lengths.
- Characterization of self-assembled nanoparticle dimensions (hydrodynamic diameter, supramolecular weight) and critical assembly concentrations.
- Encapsulation studies using hydrophobic borondipyrromethene chromophores.
Main Results:
- Macromolecules self-assembled into nanoscaled particles when the hydrophobic-to-hydrophilic ratio was between 6:1 and 1:2.
- Critical assembly concentration decreased, while hydrodynamic diameter and supramolecular weight increased with higher relative hydrophobic content.
- Increased hydrophobic content reduced interchromophoric interactions and delayed quencher access, indicating enhanced guest stability.
- A 6:1 ratio of decyl to oligo(ethylene glycol) side chains proved optimal for spontaneous assembly and stable guest encapsulation.
Conclusions:
- Hydrophobic components must be in excess for optimal supramolecular host assembly.
- A 6:1 hydrophobic-to-hydrophilic ratio provides ideal structural guidelines for designing self-assembling supramolecular hosts.
- These findings enable the development of effective delivery vehicles for imaging probes and other hydrophobic molecules.
