排序方式: 共有38条查询结果,搜索用时 15 毫秒
1.
Dadkhoda Ghazanfari Mohammed M. Hashemi Mohammad Reza Akhgar Mohammad Mehdi Foroughi Fariba Najafi-Zadeh 《Phosphorus, sulfur, and silicon and the related elements》2013,188(12):3018-3022
The ring-opening reaction of epoxides with thiols by SbCl 3 supported on Kieselguhr under solvent-free conditions, afforded high yields of β-hydroxy sulfides. Nucleophilic attack of the thiols occurs regioselectively at the less hindered side of the epoxides. 相似文献
2.
Ranjbarzadeh Ramin Akhgar Alireza Taherialekouhi Roozbeh DOrazio Annunziata Mohammad Sajadi S. Ghaemi Ferial Baleanu Dumitru 《Journal of Thermal Analysis and Calorimetry》2022,147(13):7509-7521
Journal of Thermal Analysis and Calorimetry - In this research, the effect of using GO/ water nanofluid as a coolant fluid in an isothermal heat transfer system was studied. At first, to evaluate... 相似文献
3.
Shadpour Mallakpour Fariba Derakhshan 《International Journal of Polymer Analysis and Characterization》2014,19(8):750-764
In this study, the goal was the preparation, characterization, and surface morphology of poly(amide-imide)/TiO2-citric acid nanocomposites (PAI/TiO2-CA NCs). Owing to the high surface energy and tendency for agglomeration, the surface of TiO2 nanoparticles was modified with citric acid. Then poly(amide-imide) was synthesized by direct polycondensation reaction of N,N′-(pyromellitoyl)-bis-L-leucine diacid with 4,4′-diaminodiphenylmethane by triphenyl phosphite and tetra-n-butylammonium bromide as a green medium. The attained polymer and modified TiO2 nanoparticles were used to prepare PAI/TiO2-CA NCs through ultrasonic irradiation. The resulting PAI/TiO2-CA NC was characterized with FT-IR spectroscopy, X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and thermogravimetric analysis. 相似文献
4.
Derakhshan S Assoud A Kleinke KM Dashjav E Qiu X Billinge SJ Kleinke H 《Journal of the American Chemical Society》2004,126(26):8295-8302
The new binary antimonide Ti(2)Sb was found to crystallize in a distorted variant of the La(2)Sb type, which contains a square planar La net with short La-La bonds. In the Ti(2)Sb structure, the corresponding Ti net is deformed to squares and rhombs in order to enhance Ti-Ti bonding, as proven by single-crystal X-ray investigation in combination with the real-space pair distribution function technique utilizing both X-ray and neutron powder diffraction data. Electronic structure calculations revealed a lowering of the total energy caused by the disorder, the major driving force being strengthened Ti-Ti interactions along the diagonal of the Ti(4) rhombs. 相似文献
5.
6.
Copper(II) complex of a Schiff base ligand derived from pyrrolcarbaldehyde and o‐phenylenediamine (H2L) has been synthesized and encapsulated in Y‐zeolite matrix. The hybrid material has been characterized by elemental analysis, IR and UV‐Vis spectroscopic studies as well as X‐ray diffraction (XRD) pattern. The encapsulated copper(II) catalyst is an active catalyst for the oxidation of cyclooctene and cyclohexene using H2O2 as oxidant. Under the optimized reaction conditions 81% conversion of cyclohexene with 65% selectivity for 2‐cyclohexenone formation and 87% conversion of cyclooctene with 46% selectivity for epoxide formation were obtained. 相似文献
7.
Mohammad Reza Akhgar Mohammad Salari Hassan Zamani 《Journal of Solid State Electrochemistry》2011,15(4):845-853
The redox response of a modified carbon nanotube paste electrode of ferrocenedicarboxylic acid was investigated. Cyclic voltammetry,
differential pulse voltammetry, and chronoamperometry were used to investigate the electrochemical behavior of levodopa (LD)
at modified electrode. Under the optimized conditions (pH 5.0), the modified electrode showed high electrocatalytic activity
toward LD oxidation; the overpotential for the oxidation of LD was decreased by more than 190 mV, and the corresponding peak
current increased significantly. Differential pulse voltammetric peak currents of LD increased linearly with its concentrations
at the range of 0.04 to 1,100 μM, and the detection limit (3σ) was determined to be 12 nM. The diffusion coefficient ( D = 9.2 ×10 - 6cm2/s ) \left( {D = {9}.{2} \times {1}{0^{ - {6}}}{\hbox{c}}{{\hbox{m}}^2}/{\hbox{s}}} \right) and transfer coefficient (α = 0.49) of LD were also determined. Mixture of LD, NADH, and tryptophan (TRP) can be separated from one another by differential
pulse voltammetry. These conditions are sufficient to allow determination of LD, NADH, and TRP both individually and simultaneously.
The modified electrode showed good reproducibility, remarkable long-term stability, and especially good surface renewability
by simple mechanical polishing. The results showed that this electrode could be used as an electrochemical sensor for determination
of LD, NADH, and TRP in real samples such as urine and water samples. 相似文献
8.
A unipotent linear group over a skew field of characteristic2 is nilpotent. 2000 Mathematics Subject Classification 20H25(primary), 20F18 (secondary). 相似文献
9.
10.