Synthesis of hollow nanostructured nickel oxide microspheres by ultrasonic spray atomization

Hydrothermal Treatment of Tannin: A Route to Porous Metal Oxides and Metal/Carbon Hybrid Materials

“…Again, such order of magnitude perfectly agrees with what can be seen in high-resolution TEM pictures of Figure 7e,f. Interestingly, hollow NiO microspheres having similar diameters were also produced by ultrasonic spray atomisation but their surface area was lower (11-30 m 2 ·g −1 , depending on the synthesis conditions) because made of bigger nanoparticles (average size 35-64 nm) [52].…”

Synthesis, characterization, and application of nickel oxide/CNT nanocomposites to remove Pb2+ from aqueous solution

“…The functionalization of CNTs is commonly performed using the chemical oxidation process introducing functional groups such as -COOH, C-O, C=O, and -OH on the surface of CNTs; such groups act as active surface sites for metal attachment [20,21]. NiO nanostructure can be synthesized through various methods such as co-precipitation [22], sol gel [23], hydrothermal [24], spray pyrolysis method [25], and chemical precipitation [26]. In this study, NiO/CNT nanocomposite was synthesized by chemical precipitation method, which was simple and cost efficient.…”

Low Weight Hollow Microspheres of Iron with Thin Dielectric Coating: Synthesis and Microwave Permeability

“…In these papers, nitrate solutions of the Ni and Co (10 wt.%) at 1000 • C were applied as precursors. The 2 of 12 frequency of the ultrasonic generator was 1.7 MHz in the experiment with nickel oxide [7] and 1.7-2.2 MHz in the case of Co [10,11]. The typical diameter of the microspheres of nickel oxide and cobalt oxide was 5-7 µm and 1.5 µm [7,11], respectively.…”

“…An ultrasonic atomizer sputters the initial salt solution that undergoes high temperatures. As a result, hollow microspheres are usually formed [6,7]. The reason for the "hollowness" of the particles is the balance between the high evaporation rate of the solvent from the droplet [8] and the diffusion rate of the components of the droplet, e.g., ions, metal clusters, etc.…”

“…Recently, the synthesis of nickel oxide [7] and metallic cobalt [10,11] by the spray pyrolysis technique was reported. It was shown that changes in the frequency of ultrasonic atomization and the concentration of the initial salt solution regulates the particle size of the final product [12,13].…”