Showing papers by "Mahmoud Roushani published in 2012"
TL;DR: In this article, a carbon electrode modified with nickel oxide nanoparticles has been used to investigate the electrochemical oxidation of Glycine, l-Serine, and l-Alanine in an alkaloid solution.
Abstract: Glassy carbon electrode modified with nickel oxide nanoparticles has been used to investigate the electrochemical oxidation of Glycine, l-Serine, and l-Alanine in an alkaloid solution. The electrochemical behavior of the modified electrode was characterized by cyclic voltammetry in detail. The electrocatalytic behavior is further exploited as a sensitive detection scheme for the above amino acids by hydrodynamic amperometry. Under optimized conditions, the calibration curves are linear in the concentration ranges of 1–200 μM for Glycine, 1–400 μM for l-Serine, and 30–200 μM for l-Alanine, respectively. The respective detection limit (S/N = 3) and sensitivity are 0.9 μM and 24.3 nA μM−1 for Glycine, 0.85 μM and 12.4 nA μM−1 for l-Serine, and 29.67 μM and 0.4 nA μM−1 for l-Alanine. The prepared electrode exhibits a satisfactory stability and long life-time, while it is stored at ambient conditions.
61 citations
TL;DR: In this article, the photoluminescence spectrum of Cd(OH)2 nanostructures appears as two emission bands: one related to green emission at 475-510 nm and the other related to deep level emission at 510-540 nm.
Abstract: Ultralong Cd(OH)2 nanowires were fabricated in high yield by a convenient chemical method using alkali medium at room temperature without using any templates. The preparation conditions induce a unilateral growth of nanowires, despite the absence of any template. The length of the nanowires reached several hundreds of micrometers, giving an aspect ratio of a few thousands. The X-ray diffraction shows that the Cd(OH)2 nanostructures crystallized in the wurtzite structure without any special orientation. The photoluminescence spectrum of Cd(OH)2 nanostructures appears as two emission bands: one related to green emission at 475–510 nm, and the other related to deep level emission at 510–540 nm. Also the formation mechanisms of the nanowires are presented. The growth mechanism involves the irreversible and specifically oriented self-assembly of primary nanocrystals and results in the formation of the nanowires.
6 citations
TL;DR: In this article, the UO2L4 complex was decomposed in two and the others were decomosed in three stages, the first order reaction was first order for the studied complexes and then the Schiff base ligands were decoded in one or two steps.
Abstract: The new [UO2L(CH3OH)] [where L = bis(salicylaldehyde)2,6-diiminopyridine (L1), bis(5-methoxysalicylaldehyde)2,6-diiminopyridine (L2), bis(5-bromosalicylaldehyde)2,6-diiminopyridine (L3), bis(5-nitrosalicylaldehyde)2,6-diiminopyridine (L4)] complexes were synthesized and characterized by IR, UV–vis and elemental analysis. Methanol solvent is coordinated to uranyl complexes. The electrochemical properties of the uranyl complexes were investigated by cyclic voltammetry in DMF solvent. Thermogravimetry and differential thermoanalysis of the uranyl complexes were carried out in the range of 20–700 °C. The UO2L4 complex was decomposed in two and the others were decomposed in three stages. Up to 85 °C, the coordinated solvent was released then the Schiff base ligands were decomposed in one or two steps. Decomposition of synthesized complexes is related to the Schiff base characteristics. The thermal decomposition reaction is first order for the studied complexes.
3 citations