Research Grant Report
Synthesis of High Purity, Well Crystallized Nanoparticles via Low Pressure Spray Drying
2019 Volume 27 Pages 35-41
Details
2019 Volume 27 Pages 35-41
This research demonstrated a simple, facile means for the production of monodisperse fine metal particles with high levels of crystallinity and purity using a rapid spray heating process. Fine particles of colloidal Ag (geometric mean diameter dp = 1.01 μm, geometric standard deviation σg = 1.22 and crystal size dc = 22 nm) prepared by a liquid phase method were used as a test material to evaluate the proposed technique, and the effects of drying temperature (200–900°C) on particle characteristics were investigated in detail. The particles obtained after spray heating at 500°C exhibited high crystallinity (dc = 40 nm) and high purity while keeping their initial morphology and size distribution (dp = 0.92 μm, σg = 1.24). The volume resistivity of the fine Ag particles after spray heating was 3.6 × 10–5 Ω·cm, which was considerably lower than that of fine Ag particles before spray heating (6.4 × 10–3 Ω·cm) by a factor of 180. The simple method proposed in this paper has the potential to produce high-quality fine particles of various metals suitable for real-world applications.
