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chloride
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Silica chloride/wet SiO2 as a novel heterogeneous system for the deprotection of acetals under mild conditions [electronic resource]
, Article Phosphorus, Sulfur, and Silicon and the Related Elements ; Volume 178:2667-2670, Issue 12, 2003 ; Pourjavadi, Ali ; Zolfigol, Mohammad Ali ; Bamoniri, Abdolhamid
Abstract
A combination of silica chloride and wet SiO2 was used as an effective deacetalizating agent for the conversion of acetals to their corresponding carbonyl derivatives under mild and heterogeneous condition
Silica chloride/wet SiO2 as a novel heterogeneous system for the deprotection of acetals under mild conditions
, Article Phosphorus, Sulfur and Silicon and the Related Elements ; Volume 178, Issue 12 , 2003 , Pages 2667-2670 ; 10426507 (ISSN) ; Pourjavadi, A ; Zolfigol, M. A ; Bamoniri, A ; Sharif University of Technology
Taylor and Francis Ltd
2003
Abstract
A combination of silica chloride and wet SiO2 was used as an effective deacetalizating agent for the conversion of acetals to their corresponding carbonyl derivatives under mild and heterogeneous condition
Preparation and characterization of poly (vinyl chloride) (PVC) based membrane for wastewater treatment
, Article Journal of Water Process Engineering ; Volume 16 , 2017 , Pages 98-107 ; 22147144 (ISSN) ; Bastani, D ; Mousavi, S. A ; Sharif University of Technology
Elsevier Ltd
2017
Abstract
This study concentrates on fabrication of low-cost antifouling membranes by incorporation of alumina in PVC membranes for membrane bioreactor (MBR). PVC based membranes were prepared via phase inversion method at different alumina contents. Pure water flux through the membranes and its antifouling properties in MBR setup at operating pressure of −0.4 bar were studied. The effects of the alumina on the morphology and physical properties of the membranes were investigated by scanning electron microscopy (SEM), atomic force microscopy (AFM), contact angle, pore size, viscosity, porosity, and mechanical properties. The results showed that the membrane with 3 wt% alumina exhibited excellent...
Solid phase regeneration of carbonyl compounds by oxidative cleavage of carbon-nitrogen double bonds with molecular oxygen at room temperature
, Article Letters in Organic Chemistry ; Volume 3, Issue 2 , 2006 , Pages 121-122 ; 15701786 (ISSN) ; Akhbari, M ; Karimi Jaberi, Z ; Sharif University of Technology
2006
Abstract
Montmorillonite K10-supported manganese(II) chloride was found to be an efficient and convenient catalyst for the oxidative cleavage of oximes, phenylhydrazones and semicarbazones to the corresponding carbonyl compounds with molecular oxygen. © 2006 Bentham Science Publishers Ltd
Oxidation of aromatic alcohols to carbonyl compounds with oxygen catalyzed by iron (III) chloride supported on kieselguhr
, Article Letters in Organic Chemistry ; Volume 2, Issue 6 , 2005 , Pages 559-560 ; 15701786 (ISSN) ; Ezabadi, A ; Karimi Jaberi, Z ; Sharif University of Technology
2005
Abstract
Oxidation of aromatic alcohols to corresponding aldehydes and ketones have been carried out using molecular oxygen and FeCl3 supported on kieselguhr as catalyst in good yields. © 2005 Bentham Science Publishers Ltd
Copper chloride/kieselguhr: An efficient catalyst for oxidation of thiols to disulfides by molecular oxygen or air
, Article Journal of Chemical Research ; Issue 5 , 2004 , Pages 364-365 ; 03082342 (ISSN) ; Karimi Jaberi, Z ; Ghazanfari, D ; Sharif University of Technology
Scientific Reviews Ltd
2004
Abstract
Kieselguhr supported copper chloride catalyses the oxidation of thiols to disulfides in the presence of oxygen or air
On the formation of SWCNTs and MWCNTs by Arc-discharge in aqueous solutions: the role of iron charge and counter ions [electronic resource]
, Article Journal of Fullerenes, Nanotubes and Carbon Nanostructures ; 2011, Volume 19, Issue 4, Pages 317-328 ; Shervin, Sh ; Simchi, A. (Abdolreza) ; Sharif University of Technology
Abstract
Single-walled carbon nanotubes (SWCNTs) and multiwalled carbon nanotubes (MWCNTs) were synthesized in aqueous solutions containing FeCl2, FeCl3, FeSO4 and Fe2(SO4)3. The effects of iron charge and the counter ions on the formation of carbon nanotubes (CNTs) were investigated. Thermogravimetric (TG) analysis indicated that carbon multilayer structures including CNTs and multishell graphite particles were formed in deionized (DI) water without the iron precursor. SWCNTs were also synthesized in the presence of the iron ions. It was also found that the mole ratio of [Fe2+]/[Fe3+] in the solution has a significant influence on the purity of CNTs and the process yield. The highest yield was...
A sustainable approach to the Ugi reaction in deep eutectic solvent
, Article Comptes Rendus Chimie ; Volume 16, Issue 12 , 2013 , Pages 1098-1102 ; 16310748 (ISSN) ; Dezfooli, S ; Hashemi, M. M ; Sharif University of Technology
2013
Abstract
The Ugi reaction goes fast with high yields in a recyclable and biodegradable low-melting mixture of choline chloride and urea (DES) as a novel and efficient reaction medium. The DES is applicable to a wide range of aldehydes, amines, isocyanides, and acids in good to excellent isolated yields (60-92%) and short reaction times (2-5 h) and can be reused four times without any loss of activity
Improvement in flux and antifouling properties of PVC ultrafiltration membranes by incorporation of zinc oxide (ZnO) nanoparticles
, Article Separation and Purification Technology ; Volume 156 , 2015 , Pages 299-310 ; 13835866 (ISSN) ; Vatanpour, V ; Davood Abadi Farahani, M. H ; Zarrabi, H ; Sharif University of Technology
Elsevier
2015
Abstract
In this study, modification of polyvinyl chloride (PVC) ultrafiltration membranes with zinc oxide (ZnO) nanoparticle addition was taken into consideration. The ZnO at five different weights was added to the polymeric solution, and the membranes were fabricated by the phase inversion method using water as a nonsolvent and PEG 6 kDa as a pore former additive. The results showed that the pure water flux of the modified membranes increased up to 3 wt% ZnO addition, which was the optimized amount of the nanoparticle addition in this study. Also, at 3 wt% ZnO addition, flux recovery ratio reached from 69% to above 90%, indicated that the nanocomposite membranes were less susceptible to be fouled....
SnCl4/SiO2: an efficient heterogeneous alternative for one-pot synthesis of β-acetamidoketones
, Article Journal of the Chinese Chemical Society ; Volume 56, Issue 2 , 2009 , Pages 386-391 ; 00094536 (ISSN) ; Mahmoodi Hashemi, M ; Sadeghi, B ; Emtiazi, H ; Sharif University of Technology
2009
Abstract
Enolizable ketones have been reacted in a one-pot method with aromatic aldehydes, acetyl chloride and acetonitrile at room temperature in the presence of SnCl4/SiO2 to furnish the corresponding β-acetamidoketones in improved yields. Acetylation of an aromatic hydroxyl group was observed while using 4-hydroxybenzaldehyde or vanillin and the corresponding β-acetamidoketones were isolated in an excellent yield
A green and efficient route for P − S − C bond construction using copper ferrite nanoparticles as catalyst: a TD-DFT study
, Article Phosphorus, Sulfur and Silicon and the Related Elements ; 26 October , 2020 ; Daneshfar, M ; Azaryan, R ; Sharif University of Technilogy
Taylor and Francis Ltd
2020
Abstract
Magnetic nanoparticles of CuFe2O4 were applied as catalyst system for one-pot thiophosphate synthesis via the reaction of aryl sulfonyl chlorides with H-phosphonates under conventional heating conditions. This is an extremely efficient and green method for thiophosphate synthesis under base- and solvent-free conditions. Various thiophosphates were obtained in good to excellent yields under the optimized reaction conditions in a short time. The catalyst can be easily recycled from the reaction by an external magnetic field and reused for the next run. In this study, TD-DFT B3LYP/6-31 + G(d) calculations are in good accord with the experimental results. A comparison between experimental and...
Transition metal free oxidation of alcohols to carbonyl compounds using hydrogen peroxide catalyzed with LiCl on montmorillonite K10
, Article Acta Chimica Slovenica ; Volume 54, Issue 3 , 2007 , Pages 635-637 ; 13180207 (ISSN) ; Khalili, B ; Abdollahifar, A ; Hashemi, M. M ; Sharif University of Technology
2007
Abstract
Alcohols have been successfully converted into their corresponding carbonyl compounds using hydrogen peroxide catalyzed by lithium chloride on montmorillonite K10. Clay supported lithium chloride can be recovered after using as catalyst for oxidation of alcohols. The future runs according to this procedure showed no considerable decrease in the reaction yield and catalyst effect
Facile double Fries rearrangement of diesters under microwave irradiation; application to the synthesis of a biogenetically rare type of natural phenol
, Article Letters in Organic Chemistry ; Volume 3, Issue 2 , 2006 , Pages 123-127 ; 15701786 (ISSN) ; Porkaleh, H ; Zali Boeini, H ; Sharif University of Technology
2006
Abstract
Various diesters successfully undergo a double Fries rearrangement to afford the corresponding bis o-hydroxylaryl ketones, in the presence of AlCl3 under microwave irradiation. © 2006 Bentham Science Publishers Ltd
Oxidation of benzylic alcohols to carbonyl compounds with hydrogen peroxide catalysed by manganeses chloride supported on montmorillonite K10
, Article Journal of Chemical Research ; Issue 8 , 2005 , Pages 484-485 ; 03082342 (ISSN) ; Khalili, B ; Eftekhari-sis, B ; Sharif University of Technology
Scientific Reviews Ltd
2005
Abstract
Manganeses(II) chloride supported on montmorillonite K10 was found to be an efficient catalysts for the oxidation of alcohols to carbonyl compounds with hydrogen peroxide as oxidant
, M.Sc. Thesis Sharif University of Technology ; Yoozbashizadeh, Hossein (Supervisor)
Abstract
High advantages of hydrometallurgy have led to its recent development in metal extraction. Many investigations are being carried out on applying hydrometallurgy processes on copper extraction. In this study, the chloride leaching of chalcopyrite in a concentrated sodium chloride solution (4M) –which is a novel process–, using CuCl2 as leachant is investigated. Main effects and interactions of temperature (50–90°C), time (2–6 hr), CuCl2 concentration (0.1–0.5M), pulp density and HCl concentration (0.1–1M) at constant stirring rate (600 rpm) on leaching is studied using 2k factorial design and applying Design–Expert 7.0.0 software. While the effect of pulp density is almost negligible,...
Nano CoCuFe2O4 catalyzed coupling reaction of acid chlorides with terminal alkynes: A powerful toolbox for palladium-free ynone synthesis
, Article Catalysis Communications ; Volume 102 , 2017 , Pages 71-75 ; 15667367 (ISSN) ; Pourkaveh, R ; Ahangarpour, M ; Sharif University of Technology
Elsevier B.V
2017
Abstract
The present work describes the application of nano CoCuFe2O4 toward the coupling reaction of acyl chlorides with terminal alkynes. By this catalytic system, ynone derivatives were formed in high yields via a palladium-free strategy. This protocol avoids the use of phosphine ligands as well as toxic CO sources. Recovery of catalyst by employing an external magnetic field and its reuse up to 9 consecutive trials confirm the robustness of this catalytic system. © 2017 Elsevier B.V
A deep look into the dynamics of saltwater imbibition in a calcite nanochannel: temperature impacts capillarity regimes
, Article Langmuir ; Volume 36, Issue 31 , 2020 , Pages 9035-9046 ; Koleini, M. M ; Greenwell, H. C ; Ayatollahi, S ; Ghazanfari, M. H ; Sharif University of Technology
American Chemical Society
2020
Abstract
This research concerns fundamentals of spontaneous transport of saltwater (1 mol·dm-3 NaCl solution) in nanopores of calcium carbonates. A fully atomistic model was adopted to scrutinize the temperature dependence of flow regimes during solution transport under CaCO3 nanoconfinement. The early time of capillary filling is inertia-dominated, and the solution penetrates with a near-planar meniscus at constant velocity. Following a transition period, the meniscus angle falls to a stabilized value, characterizing the capillary-viscous advancement in the calcite channel. At this stage, brine displacement follows a parabolic relationship consistent with the classical Lucas-Washburn (LW) theory....
Synthesis of Superabsorbents Based on Agar and Modified Agar and Investigation of their Applications in Controlled Release of Potassium Nitrate as a Sample of Ionic Fertilizers
, M.Sc. Thesis Sharif University of Technology ; Pourjavadi, Ali (Supervisor)
Abstract
This thesis focouses on the preparation and super-swelling behavior of two superabsorbent hydrogel. In the first section, a new superabsorbent hydrogel based on agar was prepared and the effect of the ratio of some components(AA, AAM, MBA, APS and agar) on the swelling capasity of the hydrogel was studied. Maximum water absorbency of the optimized final product was found to be 614.5 g/g in distilled water. The structure of the hydrogel was characterized by FT-IR method and morphology of the samples was examined by scanning electron microscopy(SEM). Swelling behavior properties of optimized hydrogel sample in different swelling medium were investigated. In the second section, we report the...
An Investigation on Pitting Corrosion of 304, 316 and 316L Stainless Steels in 3.5%NaCl Solution and Effect of polyethyleneimine on Pitting Corrosion of These Steels
, M.Sc. Thesis Sharif University of Technology ; Afshar, Abdollah (Supervisor)
Abstract
In this study, pitting corrosion of 304, 316 and 316L stainless steels in 3.5% NaCl solution at different temperatures (25, 40, and 70°C), were studied by electrochemical methods such as Cyclic Potentiodynamic Polarization, Electrochemical Impedance Spectroscopy and Immersion tests. Also, the effects of different concentrations of polyethyleneimine with two molecular weights (2000 and 60000 g/mol) on pitting corrosion of these steels were investigated. Finally, the adsorption behavior of inhibitors on surface of alloys was investigated by Atomic Force Microscopy (AFM) and Attenuated Total Reflectance Fourier transform spectroscopy (ATR-FTIR). It was found that both inhibitors prevent...
Synthesis of Magnesium Nanoparticles with Ball Mill
, M.Sc. Thesis Sharif University of Technology ; Sadrnezhaad, Khatiboleslam (Supervisor)
Abstract
In recent years magnesium nanoparticles due to their noticeable differences from bulk and their wide applications in various branches including the ability to absorb hydrogen, application in batteries, activation of propellant, different applications in biochemistry and strengthening secondary phase in composites, are well under investigation. The objective of this study is to find an easy, economical and high purity method to obtain magnesium nanoparticles and to introduce an innovative approach of magnesium nanoparticles synthesis in an industrial scale. To achieve this goal, milling process is applied. Micron-sized magnesium powders with different amounts of sodium chloride salt powders...