A two-step synthesis for preparing metal microcapsules with a biodegradable polymer substrate

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Metal microcapsules are emerging as superior alternatives to polymer microcapsules for various applications.
• Developing cost-effective and efficient methods for metal microcapsule synthesis is crucial for their wider adoption.

Purpose of the Study:

• To develop a simplified method for synthesizing metal microcapsules with enhanced properties.
• To investigate the influence of nanoparticle size and gold salt concentration on secondary metal shell formation.
• To achieve cost-effective production of metal microcapsules with high core retention efficiency.

Main Methods:

• Synthesis of poly(vinyl pyrrolidone)-stabilised platinum nanoparticles (PVP-Pt).
• Secondary metal shell (gold) deposition onto polymeric microcapsules using electroless plating.
• Characterization of nanoparticle size and secondary shell thickness and quality.

Main Results:

• Nanoparticle size did not significantly affect secondary shell thickness but influenced shell quality.
• Gold salt concentration was identified as a limiting factor in electroless deposition.
• Successfully produced gold-shelled microcapsules with thicknesses as low as 56 ± 13 nm.
• Achieved complete core retention of volatile actives.

Conclusions:

• A novel, simplified method for producing cost-effective metal microcapsules has been established.
• The findings provide fundamental understanding for optimizing metal shell deposition.
• The developed microcapsules demonstrate potential for efficient encapsulation of volatile substances.