Effect of Supercritical Ethanol Drying on the Properties of Zinc Oxide Nanoparticles

Abstract

The synthesis, characterization, and application as polymers and anti-wear additives of nanosized zinc oxide particles obtained by conventional and supercritical ethanol drying are reported in this study. The nanaoparticles of ZnO produced by the two different drying techniques were characterized using Fourier Transform Infrared (FT-IR) spectrophotometry, Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD) and Thermogravimetric analysis (TGA) to elucidate the shape, size, composition, and stability of the nanoparticles. ZnO nanoparticles were then applied to poly (vinyl chloride) (PVC) powder and light mineral oil to assess their effectiveness and suitability as additives in diverse areas. XRD analysis revealed ZnO crystalline structure with average particle size of 24.7 nm for zinc oxide nanoparticles prepared by supercritical ethanol drying while SEM showed well-isolated and monodisperse particles with average size of 61.08 nm.

Comparative Study of Cold Sintering Process and Autoclave Thermo-Vapor Treatment on a ZnO Sample

“…In addition to the ZnO reflexes, low-intensity reflexes are visible, which, as in [19], belong to the Zn 5 (OH) 8 Cl 2 H 2 O (JCPDS 7-155) phase, formed after TVT ZnO at 240 • C ( Table 3). The appearance of the Zn 5 (OH) 8 Cl 2 H 2 O phase with a decomposition temperature of 250 • C was observed in [34] and also in [10]. On the X-ray pattern of the CSP4 sample (Figure 7b), unidentified traces of the decay product of this phase are marked with a round icon.…”

Supercritical CO2 drying of alginate/zinc hydrogels: a green and facile route to prepare ZnO foam structures and ZnO nanoparticles

“…These results can be explained by the elimination of capillary force among particles during supercritical drying, which can inhibit particle agglomeration. 63 In the ionotropic gelling of alginate, zinc was chelated by two carboxylic groups of two polymer chains via electrostatic bridges which led to the formation of a stiffened gel. To understand the inuence of this complexation on the vibrational bands of alginate, both alginate gel and cross-linked Alg/ Zn xerogel and aerogel beads prepared using three different concentrations of the zinc source were analyzed using FT-IR spectroscopy.…”

“…These results can be explained by the elimination of capillary force among particles during supercritical drying, which can inhibit particle agglomeration. 63 …”

Zinc Borate Chemical Garden and Zinc Borate Powders from Tincal Mineral and Zinc Sulfate Heptahydrate

“…Thus sodium sulfate was present as only in small amount as impurity. The presence of peaks at 2θ values of 31.7º, 34.3º, 36.2º (JCPDS card number 79-0206) would indicate the presence of ZnO in the samples [37]. ZnO also was not present since these peaks were absent.…”