scholarly journals Preparation and electrochemical characterization of TiO2 as an anode material for magnesium-ion batteries

2021 ◽  
Vol 104 (4) ◽  
pp. 104-116
Author(s):  
A.K. Abildina ◽  
◽  
Kh. Avchukir ◽  
R. Zh. Dzhumanova ◽  
A.N. Beiseyeva ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Particle Diameter ◽  
Morphological Characteristics ◽  
Cyclic Voltammograms ◽  
Monoclinic Crystal ◽  
X Ray ◽  
Charge Transfer Rate ◽  
Titanium Dioxide Content ◽  
Magnesium Ion Batteries ◽  
Number Of Cycles

Anode on the basis of titanium dioxide powder was made. Its morphological characteristics were investigated using ellipsometry, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). Electrochemical properties were also investigated by cyclic voltammetry. Dispersing, mixing the initial reagents for obtaining homogenized paste and its coating to a substrate, drying and cutting the electrodes were main steps of anode production. The results of ellipsometry, SEM and EDS demonstrated a uniformly distributed layer of about 200 μm thickness with porous structure, particle diameter of 50–80 nm and titanium dioxide content (45.7 %). The XRD data confirmed the active anode matrix formation with a monoclinic crystal lattice corresponding to the modification of titanium dioxide (B) with small anatase inclusions. Electrochemical behavior of the electrode was examined in acetonitrile-based Mg(TFSI)2 solution. Diffusion coefficient (DMg) and the charge transfer rate constant (kct) were determined from cyclic voltammograms 1.54∙10–2 cm2/s and 1.29∙10–4 cm/s, respectively. A two-step electrochemical reaction was revealed by the ratio of the electricity amount consumed in the cathode and anode processes at varying the number of cycles. Small values of polarization resistance (Rp) calculated from cyclic voltammograms indicated rapid diffusion of magnesium ions during intercalation/deintercalation.

scholarly journals Titanium Dioxide and Polyethylmethacrylate electrospun nanofibers: assessing the technique parameters and morphological characterization

2019 ◽  
Vol 22 (1) ◽  
pp. Process ◽  
Author(s):  
Jessica Dias Santos ◽  
Tabata Prado Sato ◽  
Aline Lins de Lima ◽  
Andrea Souza Nogueira ◽  
Cristiane Campos Costa Quishida ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Morphological Characteristics ◽  
Electrospun Nanofibers ◽  
Morphological Characterization ◽  
Electrospinning Technique ◽  
Flow Rates ◽  
X Ray ◽  
Significant Difference ◽  
The Mean

This work studied the synthetization and morphological characterization of Polyethylmethacrylate (PEMA) nanofibers (NFs) containing titanium dioxide (TiO2) produced by the electrospinning technique. The solution to produce the nanofibers was prepared by dissolving 2.5g PEMA in 6.75mL of 1.1.2.2- tetrachloroethane and 3.375mL of dimethylformamide (DMF), and 0.405g of TiO2 was added to the solution. The nanofiber production used different distances between the tip of the needle to the collector (10, 12 and 15 cm) and two flow rates (0.05 mLh-1 and 0.08 mLh-1) were employed, while the applied voltage was 17kV. The NF morphology was analyzed by Scanning Electron Microscopy (SEM) and Image J software. We used Fourier Infrared Spectroscopy (FTIR) and Energy Dispersive X-Ray Spectroscopy (EDS) to evaluate the structural properties. All parameters were effective in the NF production, however it was shown that the distance of 12 cm produced the best NFs. The mean diameters showed no statistically significant difference between the samples. The FTIR analysis showed characteristic peaks of PEMA and TiO2. It was concluded that the employed method was efficient for NF production containing PEMA and TiO2,and the morphological characteristics of the NFs were influenced by the voltage and distance. KeywordsPolymer; Fibers; Electrochemistry.

scholarly journals Determination of Titanium Dioxide Content in Bauxites Using X-ray Fluorescence Spectrometry by Fusion and by Pressing

2018 ◽  
pp. 380-387 ◽  
Author(s):  
Dragana Blagojević ◽  
Dragica Lazić ◽  
Dragana Kešelj ◽  
Gordana Ostojić ◽  
Mugdin Imamović
Keyword(s):  
Titanium Dioxide ◽  
Fluorescence Spectrometry ◽  
X Ray ◽  
Titanium Dioxide Content

scholarly journals Crystallography, Molecular Modeling, and COX-2 Inhibition Studies on Indolizine Derivatives

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3550
Author(s):  
Katharigatta N. Venugopala ◽  
Sandeep Chandrashekharappa ◽  
Christophe Tratrat ◽  
Pran Kishore Deb ◽  
Rahul D. Nagdeve ◽  
...  
Keyword(s):  
Molecular Modeling ◽  
Graphical Representation ◽  
Hydrophobic Interactions ◽  
Basis Set ◽  
Monoclinic Crystal ◽  
X Ray ◽  
Cox Inhibitors ◽  
Design And Synthesis ◽  
Cox 2 ◽  
Cox 2 Inhibitors

The cyclooxygenase-2 (COX-2) enzyme is an important target for drug discovery and development of novel anti-inflammatory agents. Selective COX-2 inhibitors have the advantage of reduced side-effects, which result from COX-1 inhibition that is usually observed with nonselective COX inhibitors. In this study, the design and synthesis of a new series of 7-methoxy indolizines as bioisostere indomethacin analogues (5a–e) were carried out and evaluated for COX-2 enzyme inhibition. All the compounds showed activity in micromolar ranges, and the compound diethyl 3-(4-cyanobenzoyl)-7-methoxyindolizine-1,2-dicarboxylate (5a) emerged as a promising COX-2 inhibitor with an IC50 of 5.84 µM, as compared to indomethacin (IC50 = 6.84 µM). The molecular modeling study of indolizines indicated that hydrophobic interactions were the major contribution to COX-2 inhibition. The title compound diethyl 3-(4-bromobenzoyl)-7-methoxyindolizine-1,2-dicarboxylate (5c) was subjected for single-crystal X-ray studies, Hirshfeld surface analysis, and energy framework calculations. The X-ray diffraction analysis showed that the molecule (5c) crystallizes in the monoclinic crystal system with space group P 21/n with a = 12.0497(6)Å, b = 17.8324(10)Å, c = 19.6052(11)Å, α = 90.000°, β = 100.372(1)°, γ = 90.000°, and V = 4143.8(4)Å3. In addition, with the help of Crystal Explorer software program using the B3LYP/6-31G(d, p) basis set, the theoretical calculation of the interaction and graphical representation of energy value was measured in the form of the energy framework in terms of coulombic, dispersion, and total energy.

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