Fluorescence correlation spectroscopy directly monitors coalescence during nanoparticle preparation

Area of Science:

• Materials Science
• Chemical Engineering
• Physical Chemistry

Background:

• Nanoparticle formation involves complex processes like coalescence and aggregation.
• Understanding these mechanisms is crucial for controlling nanoparticle properties and applications.
• Traditional methods may lack the speed or resolution to capture dynamic formation events.

Purpose of the Study:

• To investigate the utility of dual color fluorescence cross-correlation spectroscopy (DC FCCS) for studying nanoparticle formation.
• To assess the generality of DC FCCS across different nanoparticle synthesis methods.
• To gain insights into the role of coalescence during the genesis of polymeric and inorganic nanoparticles.

Main Methods:

• Utilized dual color fluorescence cross-correlation spectroscopy (DC FCCS).
• Investigated three distinct nanoparticle preparation methods: emulsion-solvent evaporation, miniemulsion polymerization, and inorganic nanocapsule formation via polycondensation.
• Analyzed data to quantify coalescence and aggregation dynamics.

Main Results:

• DC FCCS provided rapid and clear data on coalescence during nanoparticle formation.
• Coalescence played a minor role in emulsion-solvent evaporation and miniemulsion polymerization.
• Significant coalescence was observed during inorganic nanocapsule formation.

Conclusions:

• DC FCCS is a powerful and versatile tool for real-time monitoring of nanoparticle genesis.
• The method offers deep mechanistic insights into nanoparticle formation processes.
• Findings highlight the differential impact of coalescence across various synthesis routes.