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Optimizing PEGylation of TiO2 Nanocrystals through a Combined Experimental and Computational Study.
Daniele Selli1, Massimo Tawfilas1, Michele Mauri1
1Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy.
Chemistry of Materials : a Publication of the American Chemical Society
|December 27, 2019
Summary
Achieving high grafting densities of PEGylated nanoparticles is crucial for biomedical uses. This study reveals that the transition from polymer "mushroom" to "brush" conformations occurs only at high grafting densities, challenging existing models.
Area of Science:
- Materials Science
- Biomedical Engineering
- Polymer Chemistry
Background:
- PEGylation enhances nanoparticle biocompatibility and circulation time for biomedical applications.
- High grafting densities of polymers on nanoparticle surfaces are desirable for improved performance.
Purpose of the Study:
- To identify optimal conditions for achieving very high grafting densities of PEG on metal oxide nanoparticles.
- To analyze polymer conformation on surfaces across different coverage regimes and polymer lengths.
Main Methods:
- Combined experimental and theoretical approach.
- Carbon-13 Nuclear Magnetic Resonance (13C NMR) spectroscopy.
- Molecular dynamics (MD) simulations.
Main Results:
- Demonstrated conditions for achieving very high grafting densities of PEG on metal oxide nanoparticles.
- Conformational analysis revealed that the mushroom-to-brush transition occurs at significantly higher grafting densities than predicted by classical models.
- 13C NMR and MD simulations showed discrepancies with existing models for polymer conformation on surfaces.
Conclusions:
- Existing models for polymer conformation on surfaces are insufficient for predicting the mushroom-to-brush transition.
- The mushroom-to-brush transition for PEGylated nanoparticles is observed only at high grafting densities.
- This finding has significant implications for designing PEGylated nanoparticles for biomedical applications.
