Green synthesis of ZnO nanoparticles via Agathosma betulina natural extract

Synthesis and characterization of novel spinel Zn 1.114 La 1.264 Al 0.5 O 4.271 nanoparticles

“…These values are consistent with the reported binding energies for Zn 2þ in the bulk zinc oxide [44]. Similarly, it was found that the peaks at about 1023 and 1022 eV can be assigned to octahedral and tetrahedral Zn 2þ ions, respectively [45]; thus, the ratio of octahedral/tetrahedral peak areas (Zn [6]/Zn [4]) was determined from the peaks located near 1023 and 1022 eV in order to find the type of zinc ferrite (ZnFe 2 O 4 ) spinel material. It was shown that increasing the mechanoactivation from 0 min to 2 and 18 min led to increase the intensity of the peak at about 1023 eV and the Zn[6]/Zn [4] ratio was increased from 0% to 36 and 69%, respectively indicating the surface structure of the activated material was changed from normal spinel to inverse spinel [45].…”

Green synthesis of Co3O4nanoparticles viaAspalathus linearis: Physical properties

“…The precipitate was then separated from the aqueous extract, first by decanting then by centrifuging at 1000 rpm 3 times for 10 min each over successive additions of de-ionized water to wash the precipitate of any residual aqueous extract. As the synthetized oxides-based nanoparticles by green process are generally amorphous, an annealing was necessary to induce an effective crystallization (23)(24)(25)(26)(27)(28)(29)(30)(31)(32). In this case, the asobtained centrifuged precipitate was heated at 90°C for 90 min to remove bio-compounds in excess.…”

“…Figure 7 shows the typical XPS spectrum of the annealed Cobalt oxide nanoparticles. (28)(29)(30)(31)(32); the mechanism of formation of such nanoparticles is not understood and is being investigated using in situ and ex situ High Performance Liquid Chromatography and Liquid Chromatography Mass Spectrometry. As mentioned previously, A. Linearis leaf extract contains, among others, two unique phenolic compounds: aspalathin (a dihydrochalcone C-glucoside) and aspalalinin (a cyclic dihydrochalcone).…”

Green Synthesis and Characterization of Silver Nanoparticles Using Vitex negundo (Karu Nochchi) Leaf Extract and its Antibacterial Activity

“…The preparation of nanoparticles such as ZnO, CdO, NiO, Sm 2 O 3 are reported by many researchers [10][11][12][13]. Although the commercial methodologies have proven as efficient tools for synthesizing, but their continuous use may pose a great threat to human health and the environment because of the use of toxic and hazardous reagents and generation of toxic byproducts in some instances [14].…”