Chromium oxide nanoparticles were synthesized by the reduction of potassium dichromate solution with Mukia Maderaspatana plant extract. In electrochemical methods, Cr2O3 nanoparticles were synthesized by two ways, using platinum (Pt) electrodes and K2Cr2O7 solution with H2SO4 as medium in the first case. And chromium doped platinum electrode (Pt/Cr) in presence of NaHCO3 solution in second case...

Benzotriazole (BTA) and tolyltriazole (TTA) were used to passivate pure copper chromium bronze alloys for environmental protection. Using the chemical immersion treatment, a dense film of chromium-free passivation layer was formed on surfaces both alloys. Microstructure, crystalline phases bonds layers systematically characterized, mechanisms studied. The mainly consisted CuO, Cu2O, polymers Cu...

A green environmental friendly process for preparing monodispersed cuprous oxide nanoparticles is reported. In this process, cuprous oxide is prepared using Cu(OH)42- as precursor and glucose as reducing agency in the presence of dispersant under ultrasonic radiation. Spherical, welldispersed Cu2O nanoparticles were obtained with the average size of 200 nm or 1.5 μm, respectively, with or witho...

Condensation of 5-nitro, 3-chloro-, and 5-chlorosalicylic acid with formaldehyde afforded dimeric disalicylmethanes which were O-methylated with dimethyl sulfate and oxidized with chromium(VI) oxide to give the diarylketones 10, 11, 12. Wittig reaction with ylides obtained by deprotonation of alkyltriphenylphosphonium salts with sodium bis (trimethylsilyl)amide yielded a series of diarylalkenes...

We have used laser-initiated chemical vapor deposition to grow the chromium oxide thin films through the oxidation of Cr~CO!6 in an oxygen environment. While both Cr2O3 and CrO2 are present in the film, the relative weight of each phase depends on the oxygen partial pressure. The Curie temperature of the film increases and approaches the bulk TC of CrO2 ~397 K! as the partial oxygen pressure is...

This paper suggests an improved method for the sample preparation to quantify vanadium, chromium, nickel and copper in tool steel high-speed by using flame atomic absorption spectrometry. The suggested prepared two specimen solutions containing different internal standard elements: one included quantifications of vanadium or cobalt quantification chromium another phosphoric acid nickel, after w...

Chromium promotion of iron oxide based water-gas shift (WGS) catalysts prepared via co-precipitation/calcination was investigated. Mössbauer spectroscopy and XRD evidence that chromium is incorporated in the calcined hematite (?-Fe2O3) precursor irrespective doping level (0?12 wt.%). CO-TPR shows delays reduction active magnetite (Fe3O4) phase. WGS activity evaluated under realistic conditions ...

In this work, the pH conditions during chromium electrodeposition are investigated using a home-made microsensor and scanning electrochemical microscopy (SECM). Few studies have focused on measuring local metal none has been conducted electrodeposition. The novelty of work is study in very acidic (pH < 1) concentrated media (>1 mol·L−1). Along with several other determinants, key factor achievi...

Heavy metals have significant importance in altering the immune response. Chromium is found in the environment commonly in trivalent, Cr (III), and hexavalent, Cr (VI), forms. The reduction of Cr (VI) to Cr (III) results in the formation of reactive intermediates (ROS) that contribute to the cytotoxicity and genotoxicity. In this study mice were treated with chromium (VI) oxide (24 mg /kg body ...