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Related Concept Videos

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Related Experiment Video

Updated: May 16, 2026

Formulation of Diblock Polymeric Nanoparticles through Nanoprecipitation Technique
06:47

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Published on: September 20, 2011

Cationic polyelectrolyte-stabilized nanoparticles via RAFT aqueous dispersion polymerization.

M Semsarilar1, V Ladmiral, A Blanazs

  • 1Department of Chemistry, The University of Sheffield, Brook Hill, Sheffield, South Yorkshire, UK.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 5, 2012
PubMed
Summary

Researchers synthesized cationic nanoparticles using polymerization-induced self-assembly (PISA). Controlling salt concentration and charge density enabled stable nanoparticle formation, yielding tunable spherical, wormlike, or vesicular structures.

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Flash NanoPrecipitation for the Encapsulation of Hydrophobic and Hydrophilic Compounds in Polymeric Nanoparticles
10:12

Flash NanoPrecipitation for the Encapsulation of Hydrophobic and Hydrophilic Compounds in Polymeric Nanoparticles

Published on: January 7, 2019

Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Polymerization-induced self-assembly (PISA) is a powerful technique for creating nanostructures.
  • Cationic nanoparticles are valuable for various applications, but their synthesis can be challenging due to electrostatic repulsion.
  • Stabilizing cationic nanoparticles requires careful control over surface charge and steric interactions.

Purpose of the Study:

  • To synthesize cationic sterically stabilized diblock copolymer nanoparticles using RAFT aqueous dispersion polymerization.
  • To investigate the influence of synthesis parameters, including salt concentration, solids content, block composition, and charge density, on nanoparticle formation.
  • To overcome challenges associated with electrostatic repulsion in cationic stabilizer chains during self-assembly.

Main Methods:

  • Utilized reversible addition-fragmentation chain-transfer (RAFT) aqueous dispersion polymerization.
  • Employed a quaternized poly(2-(dimethylamino)ethyl methacrylate) (PQDMA) as the cationic steric stabilizer macro-chain-transfer agent (macro-CTA).
  • Used poly(2-hydroxypropyl methacrylate) (PHPMA) as the hydrophobic core-forming block.
  • Investigated strategies to mitigate repulsion, such as copolymerization with glycerol monomethacrylate (GMA) or using binary macro-CTA mixtures.
  • Characterized nanoparticles using (1)H NMR spectroscopy, dynamic light scattering (DLS), transmission electron microscopy (TEM), and aqueous electrophoresis.

Main Results:

  • Demonstrated successful synthesis of cationic diblock copolymer nanoparticles via PISA.
  • Identified that high salt concentrations are necessary to overcome strong electrostatic repulsion between PQDMA chains.
  • Showed that reducing charge density, either through copolymerization or binary macro-CTA mixtures, facilitates self-assembly.
  • Confirmed complete HPMA polymerization within 2 hours at 70 °C via NMR.
  • Achieved tunable nanoparticle morphologies (spherical, wormlike, vesicular) with controlled cationic surface charge.

Conclusions:

  • Cationic sterically stabilized diblock copolymer nanoparticles can be effectively synthesized using RAFT PISA.
  • Salt concentration and charge density are critical parameters for successful self-assembly of cationic nanoparticles.
  • Strategies like copolymerization or binary macro-CTA systems offer control over nanoparticle stability and morphology.
  • The synthesized nanoparticles exhibit tunable properties, making them promising for various applications.