scholarly journals Synthesis of cerium oxide nanoparticles using Vitex extract

2020 ◽  
Vol 11 (4) ◽  
pp. 477-483
Author(s):  
T. V. Fesenko ◽  
I. V. Laguta ◽  
O. M. Stavynska ◽  
O. I. Oranska
Keyword(s):  
Electron Microscopy ◽  
Green Synthesis ◽  
Surface Area ◽  
Cerium Oxide ◽  
Nitrogen Adsorption ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Reducing Properties

The aim of this work was to study composition and antioxidant/reducing properties of Vitex cannabifolia leaves extract and to characterize it as a possible active agent for green synthesis of cerium oxide nanoparticles (CeO2-NPs). The aim of the study was also to prepare CeO2-NPs and to investigate the particles sizes, texture and morphology. Antioxidant/reducing properties of Vitex cannabifolia leaves extract were studied using Folin-Chiocalteu and 2,2-diphenyl-1-picrylhydrazyl (DPPH) tests, composition of the extract was explored by means of laser desorption/ionization time-of-flight mass spectrometry method. The extract was found to possess very high antioxidant/reducing capability, showing fast reduction of DPPH radicals even at 100-fold dilution. The main components of the extract were phenolic acids, flavonoids and terpenes; all these compounds are known to be active reducing and/ or stabilizing agents in green synthesis of various nanoparticles. Using the extract, CeO2-NPs were prepared by means of the procedure that included the reduction of cerium(IV) ammonium nitrate by extract components followed by annealing the precipitate at 600 °C under in air conditions. The particles synthesized were characterized by means of scanning electron microscopy, X-ray diffraction and nitrogen adsorption methods. According to X-ray diffraction and electron microscopy data, CeO2-NPs had crystalline structure, spherical form and fairly uniform particles size distribution; surface area of the particles was estimated from nitrogen adsorption isotherms as about 30 m2 per 1 g. The average crystallite size determined from X-ray line broadening data was about 17 nm, the average particles diameter derived from surface area data was up to ~30 nm. Thus, one can conclude that the particles synthesized are small enough to be suitable for biomedical applications while Vitex cannabifolia extract is the effective reagent for green synthesis of cerium oxide nanoparticles

scholarly journals Nickel-Doped Cerium Oxide Nanoparticles: Green Synthesis Using Stevia and Protective Effect against Harmful Ultraviolet Rays

Molecules ◽  
2019 ◽  
Vol 24 (24) ◽  
pp. 4424 ◽  
Author(s):  
Mehrdad Khatami ◽  
Mina Sarani ◽  
Faride Mosazadeh ◽  
Mohammadreza Rajabalipour ◽  
Alireza Izadi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cerium Oxide ◽  
Field Emission ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
Ni Doping ◽  
X Ray ◽  
Scanning Electron

Nanoparticles of cerium oxide CeO2 are important nanomaterials with remarkable properties for use in both industrial and non-industrial fields. In a general way, doping of oxide nanometric with transition metals improves the properties of nanoparticles. In this study, nickel- doped cerium oxide nanoparticles were synthesized from Stevia rebaudiana extract. Both doped and non-doped nanoparticles were characterized by X-ray diffraction, Field Emission Scanning Electron Microscopy, Energy Dispersive X-ray, Raman spectroscopy, and Vibrating-Sample Magnetometry analysis. According to X-ray diffraction, Raman and Energy Dispersive X-ray crystalline and single phase of CeO2 and Ni doped CeO2 nanoparticles exhibiting fluorite structure with F2g mode were synthesized. Field Emission Scanning Electron Microscopy shows that CeO2 and Ni doped nanoparticles have spherical shape and sizes ranging of 8 to 10 nm. Ni doping of CeO2 results in an increasing of magnetic properties. The enhancement of ultraviolet protector character via Ni doping of CeO2 is also discussed.

scholarly journals Cerium Oxide Nanoparticles: Synthesis and Characterization for Biosafe Applications

2021 ◽  
Vol 1 (3) ◽  
pp. 176-189
Author(s):  
Prathima Prabhu Tumkur ◽  
Nithin Krisshna Gunasekaran ◽  
Babu R. Lamani ◽  
Nicole Nazario Bayon ◽  
Krishnan Prabhakaran ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cerium Oxide ◽  
Ceo2 Nanoparticles ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diphenyltetrazolium Bromide ◽  
Scanning Electron

Due to its excellent physicochemical properties, cerium oxide (CeO2) has attracted much attention in recent years. CeO2 nanomaterials (nanoceria) are widely being used, which has resulted in them getting released to the environment, and exposure to humans (mostly via inhalation) is a major concern. In the present study, CeO2 nanoparticles were synthesized by hydroxide-mediated method and were further characterized by Scanning Electron Microscopy (SEM), Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive X-ray Spectroscopy (EDX), Fourier Transform Infrared Spectroscopy (FTIR), and X-ray Diffraction Spectroscopy (XRD). Human lung epithelial (Beas-2B) cells were used to assess the cytotoxicity and biocompatibility activity of CeO2 nanoparticles. 3-(4,5-Dimethylthiazol-2-yl)-2,5-Diphenyltetrazolium Bromide (MTT) and Live/Dead assays were performed to determine the cytotoxicity and biocompatibility of CeO2 nanoparticles. Generation of reactive oxygen species (ROS) by cerium oxide nanoparticles was assessed by ROS assay. MTT assay and Live/Dead assays showed no significant induction of cell death even at higher concentrations (100 μg per 100 μL) upon exposure to Beas-2B cells. ROS assay revealed that CeO2 nanoparticles did not induce ROS that contribute to the oxidative stress and inflammation leading to various disease conditions. Thus, CeO2 nanoparticles could be used in various applications including biosensors, cancer therapy, catalytic converters, sunscreen, and drug delivery.

Cerium Oxide Nanoparticles Catalyst for the Oxidation of Methanol

2019 ◽  
Vol 35 (5) ◽  
pp. 1539-1545
Author(s):  
Hossein Bayahia
Keyword(s):  
Cerium Oxide ◽  
Methanol Conversion ◽  
Precipitation Method ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxidation Of Methanol ◽  
Co Precipitation ◽  
Cerium Oxide Catalyst

This study outlines the synthesis of cerium oxide nanoparticles, their characterization and their activity in the oxidation of methanol. A simple and easy co-precipitation method was used for the preparation of cerium oxide, without any added surfactants. The physicochemical properties of the sample were studied using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The morphology and size of the catalyst was studied using SEM. EDX confirms the element content of the synthesized cerium oxide. The structure of CeO2 was confirmed using XRD. Thus, the reported CeO2 was an active catalyst for methanol oxidation to form formaldehyde at a temperature range of 523–753K in the gas phase. At 753K, the cerium oxide catalyst gave 53% formaldehyde selectivity, 57% methanol conversion and 31% formaldehyde yields.

scholarly journals Cerium oxide nanoparticles: influence of the high-Z component revealed on radioresistant 9L cell survival under X-ray irradiation

2013 ◽  
Vol 9 (7) ◽  
pp. 1098-1105 ◽  
Author(s):  
Adam Briggs ◽  
Stéphanie Corde ◽  
Sianne Oktaria ◽  
Ryan Brown ◽  
Anatoly Rosenfeld ◽  
...  
Keyword(s):  
Cell Survival ◽  
Cerium Oxide ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
X Ray

Optimization of Green Synthesis Approach of Silver Nanoparticles Using Indonesian Wild Honey

2021 ◽  
Vol 891 ◽  
pp. 111-115
Author(s):  
Maradhana Agung Marsudi ◽  
Farah Fitria Sari ◽  
Pandu Mauliddin Wicaksono ◽  
Adinda Asmoro ◽  
Arif Basuki ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Synthesis Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Particle Count ◽  
Transmission Electron ◽  
Nitrate Precursor ◽  
Synthesis Approach

In this work, silver nanoparticles have been successfully synthesized using simple and environmentally friendly ‘green synthesis’ method using Indonesian wild honey as mediator. Particle count and size can be optimized by varying the silver nitrate precursor and honey concentration, with the help of sodium hydroxide as pH regulator. Based on X-ray diffraction (XRD) result, crystalline structure of Ag has been confirmed in sample with impurities from AgCl. Based on dynamic light scattering (DLS) and transmission electron microscopy (TEM) results, it was found that the smallest average particles size of AgNPs (117.5 nm from DLS and 11.1 nm from TEM) was obtained at sample with 5% w/v of honey and 0.5 mM of AgNO3.

scholarly journals Synthesis, Characterization, and Antimicrobial Activity of CoO Nanoparticles from a Co (II) Complex Derived from Polyvinyl Alcohol and Aminobenzoic Acid Derivative

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Maged S. Al-Fakeh ◽  
Roaa O. Alsaedi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cobalt Oxide ◽  
Oxide Nanoparticles ◽  
Aminobenzoic Acid ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cobalt Oxide Nanoparticles ◽  
Coo Nanoparticles ◽  
Scanning Electron

Cobalt oxide nanoparticles (CoO NPs) were synthesized by the calcination method from the Co (II) complex which has the formula [Co(PVA)(P-ABA)(H2O)3], PVA = polyvinyl alcohol, and P-ABA = para-aminobenzoic acid. The calcination temperature was 550°C, and the products were characterized by element analysis, thermal analyses (TGA and DTA), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), UV-Vis spectra, and scanning electron microscopy (SEM) techniques. The kinetic and thermodynamic parameters (∆H   ∗ , ∆G   ∗ , and ∆S   ∗ ) for the cobalt (II) complex are calculated. The charges been carried by the atoms cause dipole moment 10.53 and 3.84 debye and total energy 11.04 × 102 and 24.80 × 102k Cal mol−1 for the Co (II) complex and cobalt oxide, respectively. X-ray diffraction confirmed that the resulting oxide was pure single-crystalline CoO nanoparticles. Scanning electron microscopy indicating that the crystallite size of cobalt oxide nanocrystals was in the range of 36–54 nm. Finally, the antimicrobial activity of cobalt oxide nanoparticles was evaluated using four bacterial strains and one fungal strain. Two strains of Gram-positive cocci (Staphylococcus aureus and Enterococcus faecalis), two strains of Gram-negative bacilli (Escherichia coli and Pseudomonas aeruginosa), and one strain of yeast such as fungi (Candida albicans) were used in this study.

scholarly journals Synthesis and Characterization of Nano-Tungsten Oxide Precipitated onto Natural Inorganic Clay for Humidity-Sensing Applications

Ceramics ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 120-127 ◽  
Author(s):  
Ahmed Afify ◽  
Ahmed Elsayed ◽  
Mohamed Hassan ◽  
Mohamed Ataalla ◽  
Amr Mohamed ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Tungsten Oxide ◽  
Diffraction Field ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sensing Applications ◽  
Transmission Electron ◽  
Tungsten Oxide Nanoparticles ◽  
Inorganic Clay

A wet chemical method was used to obtain tungsten oxide nanoparticles from tungsten tetrachloride and natural microfibrous inorganic clay (sepiolite) as a starting material. Precipitation of tungsten oxide species onto sepiolite under basic conditions and subsequent thermal treatment was investigated, prompted by the abundance of sepiolite in nature and the useful environmental applications that could be attained. Laser granulometry, X-ray diffraction, field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX), and high-resolution transmission electron microscopy (HR-TEM) techniques were used to study the particle-size distribution, the morphology, and the composition of the prepared sample. Our findings show the presence of tungsten oxide nanoparticles, which are less than 50 nm, on the needles of the modified sepiolite.

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