NOPR Collection:

Green synthesis of CuO/RHA-MCM-41 nanocomposite by solid state reaction: Characterization and antibacterial activity

2016-11-16T06:15:21Z

Title: Green synthesis of CuO/RHA-MCM-41 nanocomposite by solid state reaction: Characterization and antibacterial activity Authors: Ziksari, Monireh; Pourahmad, Afshin Abstract: The fabrication and characterization of mesoporous siliceous MCM-41 nanoparticles under room temperature using rice husk ash as an alternative cheap silica source is reported. Rice husk, combusted at 600 ºC for the production of amorphous silica, has been used for the preparation of CuO/RHA-MCM-41 nanocomposites containing 5.0 and 10.0 wt.% Cu under solid state reaction and calcined at 300 and 500 °C. XRD results reveal diffraction peaks for each of the two compounds in the nanocomposite. In the FT-IR spectra, all bands in nanocomposite sample show a shift with respect to that of the matrix nanoparticles, indicating that the copper oxide is incorporated in the matrix. TEM images indicate that nanoparticles size of CuO is ~ 4 nm. The novel nanocomposite exhibits excellent antibacterial activity against gram-positive (S. aureus) and gram-negative (E. coli) bacteria. Page(s): 1347-1351

Synthesis, structure, spectral and theoretical studies of an organic decachlorotricadmate(II)

2016-11-16T06:06:48Z

Title: Synthesis, structure, spectral and theoretical studies of an organic decachlorotricadmate(II) Authors: Hajji, Melek; Guerfel, Taha Abstract: Synthesis, crystal structure, DFT calculations, thermal analysis, electrochemical measurements, IR, Raman and UV spectroscopic investigations of an organic decachlorotricadmate(II) (C₄H₁₄N₂)₂[Cd₃Cl₁₀] (C₄H₁₄N₂= N^',N'-dimethylethane-1,2-diaminium) (1) are described. The structure of (1) provides a new one-dimensional polymer built up from a trinuclear [Cd₃Cl₁₀]^4- anion located in a special position and charge balanced by an unique (C₄H₁₄N₂)²⁺ cation. The anion and the organic cation are interlinked by N–H---Cl hydrogen bonds. Thermal analysis of (1) reveals its anhydrous character. Page(s): 1342-1346

Interaction of ADN with some group II and III elements

2016-11-16T05:48:58Z

Title: Interaction of ADN with some group II and III elements Authors: Türker, Lemi Abstract: Ammonium dinitramide (ADN) has been studied quantum chemically at the level of UB3LYP/6-31++G(d,p) in order to get some information about its behavior in the presence of some group II and III elements (viz., Be, Mg, B and Al). The results indicate that Be and Mg are being oxidized by AND, but B and Al are not. In the case of Be and Mg, the reduction of ADN is accompanied by the removal of NO₂ moiety which has negative total charge. On the other hand, the interaction pattern of these elements with dinitramic acid (HDN) in the presence of ammonia (HDN+NH₃+element, ternary composites) is different than the isomeric/isoelectronic binary (ADN+element) composites. Some quantum chemical properties of those binary and ternary composite systems are also presented. Page(s): 1334-1341

Electrochemical impedance spectroscopy of homo and copolymer of aniline and 2,4- dinitrophenol in a binary electrolyte system

2016-11-16T05:39:40Z

Title: Electrochemical impedance spectroscopy of homo and copolymer of aniline and 2,4- dinitrophenol in a binary electrolyte system Authors: Parsa, Ali; Sobhani, Ebtesam; Shakeri, Azadeh; Fridbod, Farnoush Abstract: Electropolymerization of aniline and 2,4-dinitrophenol on composite graphite electrode in phosphoric acid medium has been investigated by cyclic voltammetry. The copolymer has been synthesized in a mole ratio of 1:1 of aniline and 2,4-dinitrophenol in aqueous medium with para-toluene sulfonic acid and KCl as the binary supporting electrolytes. The properties of the modified electrodes have been characterized and compared with each other by FTIR spectroscopy. The inductive behavior of polyaniline and copolymers of aniline with 2,4-dinitrophenol has been identified via electrochemical impedance spectroscopy by determining parameters such as impedance and capacitance. Page(s): 1325-1333