Synthesis and Characterization of NiO Nano‐Spheres by Templating on Chitosan as a Green Precursor

Abstract

In this study, nickel oxide was prepared through the calcination of extrusion dripped chitosan/nickel nitrate beads. The morphology and structural properties of the products were studied using various characterization techniques. Uniformly distributed nickel oxide was formed as observed from the studies of surface morphology where the processing parameters play a huge role on the resulting morphology. TEM results have shown that nickel oxide with crystallite sizes of 10–30 nm was obtained. The Fourier-transform infrared spectra studies show an intense peak at 525 cm−1, which is attributed to the vibration of Ni–O bond. Furthermore, the XRD results show NiO diffraction peaks correspond to (111), (200), (220), (311), and (222) which indicates that a bunsenite structure with a face-centered cubic phase was produced in this study. The usage of 500°C as the lower limit in this study is justified due to the complete removal of the templating material as seen in the thermalgravimetric analysis studies. Furthermore, it was obtained that the largest surface area of nickel oxide synthesized using this technique is 48.024 m2/g with pore sizes of 19.843 nm. The usage of chitosan as a green template for the synthesis of nanoparticles has shown promising results which allows a more economical and sustainable approach for the fabrication of nanomaterials

Large magnetodielectric effect and negative magnetoresistance in NiO nanoparticles at room temperature

“…2,3 They possess novel electrical, magnetic and optical properties that are useful for different applications. 4,5 Nickel oxide (NiO) nanoparticles have been studied lately because of their very useful applications viz., as catalysts, gas sensors, electrochromic lms, dye-sensitized photo cathodes, electrode materials for fuel cells, batteries etc. [6][7][8][9][10][11][12][13] Various synthesis techniques of NiO nanoparticles have been attempted and reported in recent years by many researchers [14][15][16][17] to have variety of applications.…”

Ionic–gelation synthesis of gadolinium doped ceria (Ce 0.8 Gd 0.2 O 1.90 ) nanocomposite powder using sodium-alginate

“…However, due to the large volume expansion resulting from the precursors burn-off step, this method is uncontrollable in some extents, particularly for large-scale production of GDC nanocomposites [7]. Therefore, development of a simple, efficient, inexpensive and environmentally-friendly technique for synthesizing GDC nanocomposite powders with high purity is of great interest for both the manufacturing and research communities [31].…”

Thermochemical evaluation of oxygen transport membranes under oxy‐combustion conditions in a pilot‐scale facility

“…The measured pore sizes in the four tests were similar and classified into the mesoporous category, which includes pores with sizes ranging from 2 to 50 nm. Theoretically, the alteration of these parameters tends to cause a decrease in the ability of the sample to act as an efficient pathway under practical conditions …”

“…Comparison of these results with those of the treated samples as listed in Table reveals that both the surface area and the pore volume decreased upon exposure of the samples to abrasive atmospheres; the worst results werre obtained in Test 3 (80% CO 2 , 700 ppm SO 2 , 24% H 2 O, 176 ppm NO x , 841 ppm CO, and trace elements). These decreases led to a reduction in the accessible surface area, which, in turn, caused deterioration of the O 2 separation performance of this material . Although the parameters of this material show similar variation trends to those of LSCF, the variation of the parameters of CGO_Co was less pronounced; in particular, the specific surface area and pore volume of the CGO_CO samples decrease to 1.4–4.1 m 2 g −1 and 0.002–0.004 cm 3 g −1 , respectively, compared to the corresponding values of 9.2–10.5 m 2 g −1 and 0.006–0.007 cm 3 g −1 , respectively, for the LSCF samples.…”