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Updated: Jun 15, 2026

Gold Nanoparticle Synthesis

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Published on: July 10, 2021

Why Single-Chain Nanoparticles from Weak Polyelectrolytes Can Be Synthesized at Large Scale in Concentrated Solution?

Jose A Pomposo^1,2,3, Davide Arena¹, Ester Verde-Sesto^1,3

¹Centro de Física de Materiales (CSIC-UPV/EHU)-Materials Physics Center MPC, P Manuel Lardizabal 5, Donostia, E-20018, Spain.

Macromolecular Rapid Communications

|July 16, 2024

Summary

Weak polyelectrolyte (PE) precursors enable large-scale synthesis of single-chain nanoparticles (SCNPs) in concentrated solutions. This is because electrostatic blobs limit cross-linking, allowing higher concentrations than neutral polymers.

Keywords:

electrostatic blobs large‐scale synthesis polyelectrolytes single‐chain nanoparticles (SCNPs)

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Area of Science:

Polymer Chemistry
Nanotechnology
Materials Science

Background:

Single-chain nanoparticles (SCNPs) are typically synthesized from neutral polymer precursors.
Large-scale synthesis of SCNPs in concentrated solutions is challenging for neutral polymers.
The behavior of weak polyelectrolyte (PE) precursors in SCNP formation remains unclear.

Purpose of the Study:

To explain why weak polyelectrolyte (PE) precursors allow large-scale single-chain nanoparticle (SCNPs) synthesis in concentrated solutions.
To investigate the influence of electrostatic interactions on SCNP formation and properties.
To compare SCNP synthesis from PE precursors with that from neutral polymer precursors.

Main Methods:

Combined the elastic single-chain nanoparticles (ESN) model for neutral chains with classical scaling theory for PE solutions.
Analyzed the effect of electrostatic repulsion between polymer blobs on the cross-linking process.
Compared predicted outcomes with experimental results for PE-SCNPs.

Main Results:

Electrostatic repulsion within PE blobs restricts cross-linking to the interior of each blob.
The maximum concentration for PE-SCNP synthesis is determined by electrostatic blob size, not the full chain size.
PE-SCNPs can be synthesized at concentrations up to 30 times higher than for neutral polymer precursors.
PE-SCNP size increases upon dilution, and they do not form globular structures.

Conclusions:

The electrostatic blob model successfully explains the large-scale synthesis of PE-SCNPs in concentrated solutions.
This approach allows for higher precursor concentrations, overcoming limitations seen with neutral polymers.
The findings provide a framework for designing and synthesizing PE-SCNPs with controlled properties.