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A green and efficient oxidation of benzylic alcohols using H_2O_2 catalyzed by montmorillonite-K10 supported mnCl_2

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Chinese Chemical Letters 2010年第10期21卷 1162-1164页

作者： gholam Reza Najafi Department of Chemistry Islamic Azad University

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 manga... 详细信息

关键词： Green oxidation system Hydrogen peroxide montmorillonite-KlO manganese(H) chloride

Perfect GmR effect in gapped graphene-based ferromagnetic normal ferromagnetic junctions

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Chinese Physics B 2015年第4期24卷 405-410页

作者： Hossein Karbaschi gholam Reza Rashedi Department of Physics University of Isfahan

We investigate the quantum transport property in gapped graphene-based ferromagnetic/normal/ferromagnetic （FG/NG/FG） junctions by using the Dirac-Bogoliubov-de Gennes equation. The graphene is fabricated on SiC and BN substrates separately, so carders in FG/NG/FG structures are considered as massive relativistic particles. Transmission prob- ability, charge, and spin conductances are studied as a function of exchange energy of ferromagnets （h）, size of graphene gap, and thickness of normal graphene region （L） respectively. Using the experimental values of Fermi energy in the normal graphene part （EFN - 400 meV） and energy gap in graphene （260 meV for SiC and 50 meV for BN substrate）, it is shown that this structure can be used for both spin-up and spin-down polarized current. The latter case has different behavior of gapped FG/NG/FG from that of gapless FG/NG/FG structures. Also perfect charge giant magnetoresistance is observed in a range of E FN - mv 2 F〈h〈E FN＋mv 2 F.

关键词： graphene spin-polarized current giant magnetoresistance nanoscale structures

A green and efficient deoximation using H_2O_2 catalyzed by montmorillonite-K10 supported CoCl_2

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Chinese Chemical Letters 2007年第12期18卷 1451-1454页

作者： Ali Ezabadi gholam Reza Najafi mohammed m.Hashemi Department of Chemistry Central Tehran Branch Department of Chemistry Science and Research BranchIslamic Azad UniversityTehranIran Department of Chemistry Sharif University of TechnologyP.O.Box 11365-9516TehranIran

Oximes were oxidized to the corresponding carbonyl compounds in good to high yields by environmentally friendly and green oxidant, H202 catalyzed by montmorillonite K-10 supported cobalt（Ⅱ） chloride.

关键词： Green deoximation system Hydrogen peroxide montmorillonite K-IO Cobalt(II) chloride

Review of electrodeposition methods for the preparation of high-entropy alloys

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International Journal of minerals,metallurgy and materials 2022年第9期29卷 1683-1696页

作者： Zahra Shojaei gholam Reza Khayati Esmaeel Darezereshki Department of materials Science and Engineering Shahid Bahonar University of KermanKerman 76135-133Iran

High-entropy alloys(HEAs)are suitable for engineering applications requiring excellent mechanical,corrosion,thermal,and magnetic *** the last decade,electrodeposition has emerged as a promising synthesis technique for *** has focused on the influence of procedure parameters on the deposition of different HEA layers and the effect of their microstructure on their corrosion and magnetic *** review of current literature provides comprehensive information on HEAs and the use of direct and pulse electrodeposition as a synthesis technique for these *** review also addresses the research gaps on HEA production via electrodeposition,such as using other ceramic particles instead of graphene oxide in composite structures based on HEAs.

关键词： high-entropy alloy electrodeposition corrosion resistance magnetic properties

maximum mass of a hot neutron star with a quark core

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Research in Astronomy and Astrophysics 2011年第4期11卷 471-481页

作者： Tayebeh Yazdizadeh gholam Hossein Bordbar Islamic Azad University Bafgh Branch Department of Physics Shiraz University Research Institute for Astronomy and Astrophysics of maragha

We have considered a hot neutron star with a quark core, a mixed phase of quark-hadron matter, and a hadronic matter crust and have determined the equation of state of the hadronic phase and the quark phase. We have then found the equation of state of the mixed phase under the Gibbs conditions. Finally, we have computed the structure of a hot neutron star with a quark core and compared our results with those of the neutron star without a quark core. For the quark matter calculations, we have used the mIT bag model in which the total energy of the system is considered as the kinetic energy of the particles plus a bag constant. For the hadronic matter calculations, we have used the lowest order constrained variational formalism. Our calculations show that the results for the maximum gravitational mass of a hot neutron star with a quark core are substantially different from those of a neutron star without the quark core.

关键词： dense matter -- equation of state -- stars fundamental parameters(masses, radii, temperatures)

The effects of strong magnetic fields on neutron star structure:lowest order constrained variational calculations

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Research in Astronomy and Astrophysics 2013年第2期13卷 197-206页

作者： gholam Hossein Bordbar Zeinab Rezaei Department of Physics Shiraz University Center for Excellence in Astronomy and Astrophysics(CEAA-RIAAm)-maragha

We investigate the effects of strong magnetic fields upon the large-scale properties of neutron and protoneutron stars. In our calculations, the neutron star mat- ter was approximated by pure neutron matter. Using the lowest order constrained vari- ational approach at zero and finite temperatures, and employing AV18 potential, we present the effects of strong magnetic fields on the gravitational mass, radius, and gravitational redshift of neutron and protoneutron stars. It is found that the equation of state for a neutron star becomes stiffer with an increase of magnetic field and tem- perature. This leads to larger values of the maximum mass and radius for the neutron stars.

关键词： dense matter -- equation of state -- stars magnetic fields -- stars fundamental parameters (masses, radii, temperatures)

Calculation of the structural properties of asymmetrical nuclear matter

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Research in Astronomy and Astrophysics 2012年第3期12卷 345-358页

作者： gholam Hossein Bordbar Hamideh Nadgaran Department of Physics Shiraz University Research Institute for Astronomy and Astrophysics of maragha

The structural properties of asymmetrical nuclear matter have been calculated,employing the AV 18 potential for different values of proton to neutron *** calculations have also been made for the case of symmetrical nuclear matter with the UV14,AV14 and AV 18 *** our calculations,we used the lowest order constrained variational method to compute the correlation function of the system.

关键词： stars:neutron—dense matter—equation of state

mCm-41 anchored sulfonic acid (mCm-41-R-SO_3H):A mild,reusable and highly efficient heterogeneous catalyst for the Biginelli reaction

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Chinese Chemical Letters 2008年第12期19卷 1435-1439页

作者： gholam Hossein mahdavinia Hamid Sepehrian Department of Chemistry Islamic Azad University-Marvdasht BranchMarvdashtIran Jaber lbn Hayan Research Laboratories Nuclear Science and Technology Research InstituteAEOIP.O.Box 11365/8486TehranIran

An efficient three-component synthesis of 3,4-dihydropyrimidinones using mCm-41 anchored sulfonic acid （mCm-41-R-SO3H） as a mild, heterogeneous catalyst for Biginelli reaction in CH3CN under reflux condition is desc... 详细信息

关键词： One-pot mCm-41-R-SO3H Heterogeneous Biginelli reaction multicomponent

Silica supported perchloric acid(HClO_4-SiO_2):A mild,reusable and highly efficient heterogeneous catalyst for the synthesis of amidoalkyl naphthols

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Chinese Chemical Letters 2008年第10期19卷 1171-1174页

作者： gholam Hossein mahdavinia mohammad A.Bigdeli majid m.Heravi Department of Chemistry Islamic Azad University-Marvdasht BranchMarvdashtIran Faculty of Chemistry Teacher Training University49 Mofateh StreetTehranIran Department of Chemistry School of SciencesAzzahra UniversityVanakTehranIran

An efficient and direct procedure has been developed for the preparation of amidoalkyl naphthols by a one-pot condensation of aryl aldehydes, 2-naphthol and urea or amides, in the presence of HClO4-SiO2 as a heterogeneous catalyst. The reactions were carried out under reflux and solvent-free conditions. The present methodology offers several advantages such as excellent yields, simple procedure, easy work-up and ecofriendly reaction condition. The catalyst is easily prepared, stable, reusable and efficient under the reaction conditions.

关键词： One-pot HClO4-SiO2 Heterogeneous catalyst Amidoalkyl naphthol multicomponent reaction