Effect of Temperature Treatment on Electrical Property, Crystal Structures and Lattice Strains of Precipitated CaCO3 Nanoparticles

Abstract

In this study, the effect of temperature treatment during the preparation process of calcium carbonate (CaCO 3) nanoparticles was systematically examined for a drug delivery carrier. The CaCO 3 powder was prepared by the precipitation method at different annealing temperatures. The morphologies, elemental compositions and crystal structures of the synthesized CaCO 3 powder were analyzed by Scanning Electron Microscope/Energy-Dispersive Spectroscopy and X-ray Diffractometry (XRD), respectively. The result shows that the particle size increased with an increase in annealing temperature. Based on the crystal structure analyzed from XRD, the sample was perfectly matched with the calcite/ vaterite polymorphs phases. The crystallite size and lattice strains of the CaCO 3 powder were calculated from the full width at half maximum parameter. The results show that the increase in annealing temperature leads to an increase in crystallite size and a decrease in lattice strain. The CaCO 3 powder has a dielectric constant of 6.0-6.8 that reduced with the increase in applied frequency. The crystal structure, crystallite size, lattice strain, and dielectric properties of CaCO 3 powder are dependent of the annealing temperature. Such properties confirm that CaCO 3 powder is suitable for drug delivery carrier application.

Controlled preparation of CaO adsorbents by microsyringe titration technology for CO2 capture

“…S10, with an increase in the reaction temperature, the CaCO 3 precursors gradually grew from dispersed but heterogeneous particle agglomerates to final spherical large particles. The particle size of CaCO 3 increased with increasing temperature because the nucleation rate of crystals was lower than the growth rate of crystals when the temperature increased, resulting in a relative increase in the crystal growth 55,56 . From Fig.…”

“…The particle size of CaCO 3 increased with increasing temperature because the nucleation rate of crystals was lower than the growth rate of crystals when the temperature increased, resulting in a relative increase in the crystal growth. 55,56 From Fig. S11, an increase in the preparation temperature of the precursors afforded the gradual formation of a dense structure of the obtained adsorbent particles, with the worst adsorption performance at a preparation temperature of 45°C.…”