Stabilization and Controlled Association of Inorganic Nanoparticles using Block Copolymers

TL;DR

This paper investigates how block copolymers can stabilize inorganic nanoparticle aggregates in water, revealing a hierarchical core-shell structure that enhances colloidal stability through controlled association.

Contribution

It demonstrates the formation of stable, hierarchical nanoparticle-polymer aggregates with a core-shell microstructure using scattering and simulation techniques.

Findings

Hierarchical core-shell microstructure identified

Nanoparticle aggregates exhibit enhanced colloidal stability

Controlled association process enables stable hybrid structures

Abstract

We report on the structural properties of mixed aggregates made from rare-earth inorganic nanoparticles (radius 20 Angstroms) and polyelectrolyte-neutral block copolymers in aqueous solutions. Using scattering experiments and Monte Carlo simulations, we show that these mixed aggregates have a hierarchical core-shell microstructure. The core is made of densely packed nanoparticles and it is surrounded by a corona of neutral chains. This microstructure results from a process of controlled association and confers to the hybrid aggregates a remarkable colloidal stability.