Real-Time Monitoring of DyF₃ Nanoparticle Growth Using ¹H Low-Field NMR.

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Nanoparticle formation via coprecipitation is typically instantaneous.
• Studying the nucleation phase of nanoparticle synthesis is challenging due to rapid reaction kinetics.

Purpose of the Study:

• To develop a method for slowing down nanoparticle formation to study nucleation.
• To monitor the real-time nucleation and growth of dysprosium(III) fluoride (DyF3) nanoparticles.
• To characterize the synthesized DyF3 nanoparticles.

Main Methods:

• Utilized a 5 mm NMR tube for real-time 1H NMR spectroscopy.
• Slowed the coprecipitation reaction by minimizing the interface between precursor solutions.
• Applied Regularized Inverse Laplace Transform to 1H longitudinal nuclear magnetization recovery curves.
• Characterized nanoparticles using X-ray Diffraction (XRD) and Transmission Electron Microscopy (TEM).

Main Results:

• Successfully slowed the DyF3 nanoparticle formation process.
• Identified three distinct components corresponding to DyCl3, NaF, and DyF3 nanoparticles via NMR.
• Synthesized DyF3 nanoparticles with an average size of 5 nm.
• Demonstrated a novel method for monitoring nanoparticle nucleation.

Conclusions:

• A new method for studying nanoparticle nucleation by controlling precursor solution mixing has been established.
• The proposed technique enables detailed investigation of chemical reaction pathways in nanoparticle formation.
• This approach offers insights into processes influencing nanoparticle synthesis.