نتایج جستجو برای: CuO-CoO-MnO/SiO2

تعداد نتایج: 5934  

Journal: :Nanoscale 2011
Jiajia Ning Guanjun Xiao Li Wang Bo Zou Bingbing Liu Guangtian Zou

Magnetic metal (Mn, Fe, Co, and Ni) oxides nanocrystals with small size and uniform size distribution are synthesized via a cation-exchange reaction. Two experimental stages are included in the synthesis of metal oxides nanocrystals. Firstly, Cu(OH)2 decomposes to CuO nanocrystals, induced by free metal cations. Compared to CuO nanocrystals produced without any free metal cation, the free metal...

In the presented study, CuO-CoO-MnO/SiO2 nanocomposite was synthesis by Cu(II), Co(II), Mn(II), with 1:1:1 mole ratio and Tetraethyl orthosilicate. azo–azomethine 1-(3-imino-4-hydroxophenylazo-4-nitrobenzene)-4-methyl phenol (L) was synthesized and used as a ligand for capturing the metal ions. Also, 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide was applied as the i...

Journal: :The Journal of chemical physics 2011
Kalpataru Pradhan Gennady L Gutsev Charles A Weatherford Purusottam Jena

Using density functional theory with generalized gradient approximation, we have performed a systematic study of the structure and properties of neutral and charged trioxides (MO(3)) and tetraoxides (MO(4)) of the 3d-metal atoms. The results of our calculations revealed a number of interesting features when moving along the 3d-metal series. (1) Geometrical configurations of the lowest total ene...

Journal: :Journal of hazardous materials 1999
A Fortuny C Bengoa J Font A Fabregat

Catalytic wet oxidation has proved to be effective at eliminating hazardous organic compounds, such as phenol, from waste waters. However, the lack of active long-life oxidation catalysts which can perform in aqueous phase is its main drawback. This study explores the ability of bimetallic supported catalysts to oxidize aqueous phenol solutions using air as oxidant. Combinations of 2% of CoO, F...

2018
Jiyoung Jeong Sung-Hyun Kim Seonghan Lee Dong-Keon Lee Youngju Han Soyeon Jeon Wan-Seob Cho

The main mechanism of toxicity for fast-dissolving nanoparticles (NPs) is relatively simple as it originates from the intrinsic toxicity of their constituent elements rather than complicated surface reactivity. However, there is little information about the compared toxicity of fast-dissolving NP and its constituent ion, which is essential for understanding the mechanism of NP toxicity and the ...

2017
Ling Liu Jingjing Shi Hongxia Cao Ruiyu Wang Ziwu Liu

CeO2-MO x (M = Cu, Co, Ni) composite yolk-shell nanospheres with uniform size were fabricated by a general wet-chemical approach. It involved a non-equilibrium heat-treatment of Ce coordination polymer colloidal spheres (Ce-CPCSs) with a proper heating rate to produce CeO2 yolk-shell nanospheres, followed by a solvothermal treatment of as-synthesized CeO2 with M(CH3COO)2 in ethanol solution. Du...

Journal: :Brazilian Journal of Biology 2021

Abstract Nanoparticles are known bio elicitors in plant biotechnology. Different concentrations of ZnO, CuO and CoO nanoparticles were used for the enhanced accumulation secondary metabolites antioxidant activities callus derived from root, shoot leaf Artemisia annua L. Biomass was somehow affected on high Nps. Phenolic content observed maximum (60µg) at 0.1mg/l CuONps. Total activity (33µg) ro...

Journal: :ACS applied materials & interfaces 2014
Chen Wang Qing Li Fangfang Wang Guofeng Xia Ruiqing Liu Deyu Li Ning Li Jacob S Spendelow Gang Wu

Nanostructured CuO anode materials with controllable morphologies have been successfully synthesized via a facile and environmentally friendly approach in the absence of any toxic surfactants or templates. In particular, leaf-like CuO, oatmeal-like CuO, and hollow-spherical CuO were obtained by changing the ligand agents. The structures and electrochemical performance of these as-prepared CuO w...

Journal: :Physical review 2022

We report experimental evidence of the formation antiferromagnetic clusters well within cuprate superconductor ${\mathrm{La}}_{1.85}{\mathrm{Sr}}_{0.15}{\mathrm{CuO}}_{4}$ (LCu) in a composite made LCu and ferromagnet ${\mathrm{La}}_{0.6}{\mathrm{Sr}}_{0.4}{\mathrm{CoO}}_{3}$ (LCo). It is found that exchange field LCo suppresses dynamic spin fluctuation short-range-ordered superparamagnetic typ...

2015
Xin Fu

The toxicity of CuO nanoparticles (CuO NPs) to human hepatocarcinoma (HepG2) cells was investigated in this study. CuO NPs (1 40 mg/L) had significant toxicity to HepG2 cells. The antioxidant N-acetyl-L-cysteine (NAC) significantly reduces the cytotoxicity induced by the CuO NPs, supporting the hypothesis that oxidative stress contributes to the cytotoxicity of CuO NPs. To further explore the o...

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