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Mollaamin F.,Islamic Azad University at Qom
Journal of Computational and Theoretical Nanoscience | Year: 2014

A Nano biofuel cell employing a Boron nitride nanotube (BNNT) and flavin adenine dinucleotide (FAD) based on the direct electron transfer principle has been investigated using HF and DFT theoretical methods. FAD was immobilized on the BNNT together by combining water molecules in box model. We have performed the quantum chemical model to evaluate the effect of BNNT in direction of electron transfer, stability, electric properties including resistance, voltage, current, conductivity, limiting conductivity, power and nuclear magnetic resonance parameters and thermochemical properties as a biofuel cell. The data exhibited that the BNNT biofuel cell model can be applied for generating electric power in lower resistances with the best agreement in linear correlation of voltage-current directly from sustainable fuel substrate such as FAD. In this paper, the results illustrated that together with the feasibility of using BNNT and FAD to become the norm in electrochemical bio system applications.Copyright © 2014 American Scientific Publishers Copyright © 2014 American Scientific Publishers. Source

Yusofi E.,Islamic Azad University at Tehran | Mohsenzadeh M.,Islamic Azad University at Qom
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2014

Recent Planck results motivated us to use non-Bunch-Davies vacuum. In this paper, we use the excited-de Sitter mode as non-linear initial states during inflation to calculate the corrected spectra of the initial fluctuations of the scalar field. First, we consider the field in de Sitter space-time as background field and for the non-Bunch-Davies mode, we use the perturbation theory to the second order approximation. Also, unlike conventional renormalization method, we offer de Sitter space-time as the background instead Minkowski space-time. This approach preserve the symmetry of curved space-time and stimulate us to use excited mode. By taking into account this alternative mode and the effects of trans-Planckian physics, we calculate the power spectrum in standard approach and Danielsson argument. The calculated power spectrum with this method is finite, corrections of it is non-linear, and in de Sitter limit corrections reduce to linear form that obtained from several previous conventional methods. © 2014 Elsevier B.V. Source

Najafi G.R.,Islamic Azad University at Qom
Chinese Chemical Letters | Year: 2010

Primary and secondary benzylic alcohols were oxidized to the corresponding carbonyl compounds in good to high yields by environmentally friendly and green oxidant, H2O2 catalyzed by Montmorillonite-K10 supported manganese(II) chloride. © 2010 Gholam Reza Najafi. Source

Monajjemi M.,Islamic Azad University at Tehran | Mollaamin F.,Islamic Azad University at Qom
Journal of Cluster Science | Year: 2012

One of the applications of nanotechnology is use of carbon nanotubes for the targeted delivery of drug molecules. To demonstrate the physical and chemical properties of biomolecules and identify new material of drug properties, the interaction of carbon nanotubes (CNTs) with biomolecules is a subject of many investigations. CNTs is a synthetic compound with extraordinary mechanical, thermal, electrical, optical, and chemical properties widely applied for technological purposes. In this article we have tried to investigate thermodynamic parameters and dielectric effects in different solvents for one of the most famous anticancer drug "cisplatin" combined to SWCNT, by Monte Carlo and density functional theory (DFT) calculations. Cause of platinum element in cisplatin we have done calculations as Gibbs free energy, thermal enthalpy, thermal energy and entropy at 6-31G** basis set with SCRF model of solvent. In this work, the major point has been embedded that results of both two methods of Monte Carlo and DFT can overlap with each other and cisplatin- SWCNT is a suitable compound for drug delivery in different media. © 2011 Springer Science+Business Media, LLC. Source

Panahi-Kalamuei M.,University of Kashan | Mousavi-Kamazani M.,Islamic Azad University at Kashan | Salavati-Niasari M.,University of Kashan | Hosseinpour-Mashkani S.M.,Islamic Azad University at Qom
Ultrasonics Sonochemistry | Year: 2015

Selenium (Se) nanostructures were synthesized by a sonochemical method using SeCl4 as a new precursor for Se nanostructures. Moreover, hydrazine, potassium borohydride, and thioglycolic acid were used as reducing reagents in aqueous solution. Ultrasonic power, irradiation time, reducing agent, solvent, HCl, NaOH, and the surfactant were changed in order to investigate the effect of preparation parameters on the morphology and particle size of selenium. The obtained Se with different morphologies and sizes was characterized by XRD, SEM, TEM, EDS, and DRS. The selenium nanostructures exhibited enhanced photocatalytic activity in the degradation of methylene blue (MB) under visible light irradiation. Furthermore, to examine the solar cell application of as-synthesized selenium nanostructure, FTO/TiO2/Se/Pt-FTO and FTO/Se/CdS/Pt-FTO structures were created by deposited selenium film on top of the TiO2 layer and FTO glass prepared by Doctor's blade method, respectively. © 2014 Elsevier B.V. All rights reserved. Source

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