International Journal Of Bio-Inorganic Hybrid Nanomaterials
Volume:4 Issue: 2, Summer 2015

In this paper, cubic nickel oxide nanoparticles were successfully prepared by solid-state thermal decomposition of nickel(II) macrocyclic Schiff-base complex at 450°C for 3 h without employing toxic solvent or surfactant and complicated equipment. nickel(II) macrocyclic Schiff-base complex was synthesized by the reaction of 1,2-bis(2-formyl-3-methoxyphenyl)propane, NiCl2•6H2O and 1,3-phenylenediamine in methanol at room temperature and characterized by elemental analyses and FT-IR spectroscopy. The as prepared NiO nanoparticles were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The XRD pattern result shows that the synthesized NiO nanoparticles are pure and single phase. The SEM and TEM results show the morphology of the as prepared NiO nanoparticles is almost cubic shape with the average size between 20-150 nm. On the basis of the above results, other transition metal macrocyclic Schiff base complexes are therefore potentially capable of forming metal oxide nanoparticles.

Quantum dots are new types of fluorescent materials for biological labeling. As a result, QDs toxicity study is an essential requirement for future clinical applications. Therefore, the cytotoxic CdSe:ZnS quantum dots effects on some organs in mice are presented in this study. In this work, 10, 20 and 40 mg/kg doses of CdSe:ZnS quantum dots were injected to 32 adult male mice. Structural and optical properties of quantum dots were studied by XRD. The testis and liver weight of various groups were analyzed using SPSS 16 program (one way ANOVA test) and histological changes in testis, liver tissues were analyzed by Light microscopy. Testis tissue showed high toxic effect in 40 mg/kg dose. Also histological study of liver tissue showed degeneration of hepatocyte cytoplasm, nuclear matters and sinusoidal dilation in dose-dependent manner in comparable to control groups but the lobular architecture is largely maintained in10, 20 and 40 mg/kg doses. The body weight did not change significantly in any of the CdSe:ZnS treated groups. The testis weight (TW) decreased significantly in mice that received 40 mg/kg CdSe:ZnS QDs and liver weight in the case of mice treated with 20, 40 mg/kg CdSe:ZnS QDs were increased significantly. According to the differences the toxicity of quantum dot on testis and liver tissues in adult, it seems that various organs have different responses to quantum dots toxicity.

A simple, green synthesis of N-alkyl-3-acetyl-2-methylpyrrole derivatives using ZnO nanoparticles from the three component reaction of aliphatic amines, acetylacetone (as a 1,3-dicarbonyl compound) and α-haloketones under solvent-free condition is described.

This paper reports the viability of developing Zn-27Al alloy matrix hybrid nanocomposites reinforced with alumina, graphite and fly ash (solid waste bye product of coal in thermal power plants). This research work was aimed at developing low cost-high performance Zn-27Al matrix nanocomposite with low density. Alumina particulates (Al2O3), graphite added with 0, 2, 3, 4 and 5wt% fly ash were utilized to prepare 10wt% reinforcing phase with Zn-27Al alloy as matrix using two-step stir casting method. Density measurement, estimated percentage porosity, tensile testing, micro hardness measurement and optical microscopy were used to assess the performance of the nanocomposites produced. The results show that the hardness, ultimate tensile strength, and percent elongation of the hybrid nanocomposites decrease with increase in fly ash content. The maximum decrease in hardness and ultimate tensile strength of 13.72% and 15.25% respectively were observed for composite grade containing 5wt% fly ash. The percentage elongation of composite sample without fly ash is 8.9% which is comparable with that of the sample containing 2wt% fly ash with percentage elongation of 8.8%. The results show that fly ash can be utilized as complementary reinforcement in ZA-27 alloy matrix composite to reduce cost.

In this study, a feasible green method for the synthesis of copper oxide nanocrystalline is described by using sour cherry juice which has a significant effect on crystalline size, and morphology. The benefits of the green method, not only nanometer scale are formed but also low-cost method are obtained in a normal atmosphere which it has been used (CH3COO)2Cu.H2O individually as Cu sources. All samples have calcination in 600°C. The effect of sour cherry juice concentration to control crystal growth is investigated by changing the amount of it to 20, 40, and 80 mL, respectively. The synthesized particles are characterized by using X-ray Diffraction (XRD) and Field Emission Scanning Electron Microscopy (FE-SEM). Powder X-ray Diffraction analysis confirms that pure Copper Oxide nanocrystallines are in a single phase monoclinic structure which the average crystalline size has estimated via Williamson-Hall plot from the highest peak of the XRD was among 15-55 nm for all samples.

To calculation non-bonded interaction of the [CoCl6]3- complex embedded in nano ring, we focus on the single wall boron-nitride B18N18 nano ring. Thus, the geometry of B18N18 nano ring has been optimized by B3LYP method with EPR-II (Electron paramagnetic resonance) basis set and geometry of the [CoCl6]3- complex has been optimized at B3LYP method with Aldrich’s VTZ basis set and Stuttgart RSC 1997 Effective Core Potential. Also NBO (Natural Bond Orbital) analysis such as LUMO (lowest unoccupied molecular orbital) and the HOMO (highest occupied molecular orbital) for the lowest energy have been derived to estimate the structural stability and band gaps, Natural atomic orbitals, Fermi energy, absorption energy of the B18N18-[CoCl6]3- nano system can be distinguished based on these NBO data. Total atomic charges, Total atomic spin densities, Isotropic Fermi Contact Coupling and geometrical quantities of different loops of B18N18 nano ring inclusive [CoCl6]3- embedded in the nano ring at the level of B3LYP theory and EPR-II basis set for B, N, Cl atoms and Aldrich’s VTZ basis set and Stuttgart RSC 1997 Effective Core Potential for Co (III) have been calculated by Gaussian quantum chemistry package.

In this scientific research, for the first time, the removal of radioactive strontium-90 (90Sr) by γ-MnO2-AgA zeolite as a novel nanocomposite adsorbent was accomplished under different conditions such as pH, temperature, adsorbent amount and the contact time that are examined from drinking water of Ramsar city and monitored via Ultra Low-Level Liquid Scintillation Counting (LSC) technique. Prior to the reaction study, this composite was successfully prepared through three steps; first, NaA nanozeolite was prepared by the hydrothermal method. Then, silver ions (Ag+) were loaded in the NaA nanozeolite framework using ion exchange procedure and silver (Ι) nitrate solution as silver precursor for the preparation of the AgA nanozeolite. Finally, MnO2 nanoparticles (NPs) with 19.3 wt% were dispersed and deposited on the external surface of AgA nanozeolite through impregnation method for the preparation of γ-MnO2-AgA zeolite. The synthesized samples have been characterized and identified using Scanning electron microscopy-energy dispersive micro-analysis (SEM-EDX), X-ray diffraction (XRD) and Fourier transform infrared (FTIR) techniques. The obtained results denoted that radioactive 90Sr was removed and adsorbed by γ-MnO2-AgA zeolite nanocomposite under optimized conditions including pH= 8.5, temperature (25°C) and adsorbent amount (1.5 g) after 6 h with a yield 93%. The minimum detectable activity (MDA) for 90Sr via LSC instrument was 6.92 mBq/Lit. The counting efficiency of LSC system was 78%. It has been emphasized that γ-MnO2-AgA zeolite nanocomposite has a high capacity and potential for the removal of radioactive 90Sr.

The output of a piezoelectric nanogenerator based on ZnO nanowire is largely affected by the shape of nanowire. In order to obtain mechanically stable nanogenerator with high performance, the investigation of mechanical and electrical characteristics related to the nanowires and materials used in nanogenerators are of great interest and significance. This paper presents the various behavior of the conduction band, carrier concentration and the magnitude and distribution of the piezoelectric potential in cylindrical and conical shape ZnO nanowire (NW) by using finite element (FE) method. It is shown that symmetry reduction in nanowire shape and replacement the cylindrical NW with the conical NW, results in more advantageous both in terms of mechanical stability and piezoelectric potential. The large variation of the conduction band at the tip of conical nanowire results in receiving a large increase of maximum piezoelectric potential from -70 mv (cylindrical nanowire with radius of 30 nm) to -1750 mv (conical nanowire with tip radius of 5 nm and base radius of 30 nm). It is also shown that the insulating materials with lower Young’s modulus and lower relative permittivity are the best options in nanogenerator device fabrication. This numerical study can provide a guideline to design of the piezoelectric nanogenerator with high performance.