Real-Time Monitoring of DyF 3 Nanoparticle Growth Using 1 H Low-Field NMR

DyF 3 nanoparticle formation in a 5 mm NMR tube is studied. Real-time 1 H NMR spectroscopy measurements of coprecipitation reaction in the NMR tube in a magnetic field of 0.6 T were performed on a time scale up to 40 h. As it is known, the nanoparticle formation by the coprecipitation method occurs instantly. The chemical reaction was slowed down using the minimization of the interface between two precursor solutions to study the nucleation of DyF 3 particles in detail. The time-domain results of the Regularized Inverse Laplace Transform application to the 1 H longitudinal nuclear magnetization recovery curves demonstrate three components responsible for solutions of DyCl 3, NaF, and DyF 3 nanoparticles. The synthesized DyF 3 nanoparticles in a 5 mm NMR tube are characterized as DyF 3 with an average size of 5 nm using XRD and TEM methods. Thus, a method for monitoring the nanoparticle nucleation using preventing mixing of the precursor solutions by minimizing their interface has been proposed for the first time. The proposed method will allow a detailed study of the chemical reaction course and processes affecting the nanoparticle formation.