scholarly journals STRUCTURAL FEATURES OF CHROMIUM CARBID COATINGS OBTAINED BY THE MOCVD METHOD FROM THE COL “BARKHOS”

2021 ◽  
pp. 126-130
Author(s):  
S.A. Krokhmal ◽  
Yu.G. Kazarinov ◽  
T.N. Zueva
Keyword(s):  
Gas Phase ◽  
Photoelectron Spectroscopy ◽  
Organic Liquid ◽  
Structural Features ◽  
Structure And Properties ◽  
X Ray

Investigations of the structure and properties of gas-phase coatings obtained with the use of chromium organic liquid (COL) “Barkhos” have been carried out. The studies were carried out by the methods of nanoindentation, fractography, and X-ray photoelectron spectroscopy. It was found that such coatings have a two-level horizontallayered structure.

Kinetic and structural studies of oxygen availability of the mixed oxides Pr1–xMxOy (M = Ce, Zr)

1996 ◽  
Vol 11 (8) ◽  
pp. 1960-1971 ◽  
Author(s):  
M. Yu. Sinev ◽  
G. W. Graham ◽  
L. P. Haack ◽  
M. Shelef
Keyword(s):  
Gas Phase ◽  
Mixed Oxide ◽  
Photoelectron Spectroscopy ◽  
Mixed Oxides ◽  
Structural Features ◽  
Redox Processes ◽  
Structural Studies ◽  
X Ray ◽  
Speed Up ◽  
Kinetics Of

One composition of Pr–Ce mixed oxide and a range of compositions of Pr–Zr mixed oxide were prepared by coprecipitation methods and characterized by x-ray powder diffraction, thermogravimetric analysis, and x-ray photoelectron spectroscopy. Based on phases formed, the PrOy—ZrO2 system in an oxygen-containing atmosphere at moderate temperatures (up to 800–1000 °C) is analogous to that of CeO2–ZrO2. Addition of either Ce or Zr to pure Pr oxide affects both the total amount of oxygen that can be reversibly exchanged between oxide and gas phase and the kinetics of the redox processes. Ce dramatically increases the amount (per Pr atom) and lowers the temperature of exchange, Zr slightly decreases the amount and also lowers the temperature of exchange, and both modifiers speed up the rate. These observations are rationalized in terms of bulk and surface structural features of the mixed oxides.

Gas‐phase x‐ray photoelectron spectroscopy of model molecules relating to the thermochromism in poly(3‐alkylthiophene)

1990 ◽  
Vol 93 (9) ◽  
pp. 6357-6362 ◽  
Author(s):  
M. P. Keane ◽  
S. Svensson ◽  
A. Naves de Brito ◽  
N. Correia ◽  
S. Lunell ◽  
...  
Keyword(s):  
Gas Phase ◽  
Photoelectron Spectroscopy ◽  
X Ray

scholarly journals Fabrication of Strontium Bismuth Oxides as Novel Battery-Type Electrode Materials for High-Performance Supercapacitors

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Yinghui Han ◽  
Le Li ◽  
Yunpeng Liu ◽  
Xue Li ◽  
Xiaohan Qi ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
High Performance ◽  
Electrode Materials ◽  
Specific Capacity ◽  
Structural Features ◽  
High Electron ◽  
Strontium Content ◽  
X Ray ◽  
Bismuth Oxides ◽  
Improved Performance

A simple and efficient process method for the preparation of strontium bismuth oxides (SBOs) via an impregnation-calcination method is presented. The synthesized active materials are characterized using X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy. The electrochemical performance of the as-synthesized SBO samples is observed to decrease gradually as the strontium content is increased from 25% to 50%. The SBO sample with a Sr/Bi ratio of 1 : 3 shows the highest specific capacitance of 1228.7 F g−1 (specific capacity of 204.8 mAh g−1) at a current density of 1 A g−1 and a good cycling stability (75.1%) over 3000 charge-discharge cycles. The improved performance of the supercapacitors can be attributed to the unique structural features resulting from the addition of appropriate portions of Sr, which supports high electron conductivity and rapid ion/electron transport within the electrode and at the electrode/electrolyte interface. All the results show that the SBOs have considerable potential for use as high-performance battery-type electrodes in supercapacitors.

X-Ray photoelectron spectroscopy of monosubstituted perfluorobenzenes

1977 ◽  
Vol 55 (8) ◽  
pp. 1279-1284 ◽  
Author(s):  
Barry C. Trudell ◽  
S. James W. Price
Keyword(s):  
Gas Phase ◽  
Photoelectron Spectroscopy ◽  
Binding Energies ◽  
Photoelectron Spectra ◽  
Atomic Charges ◽  
X Ray ◽  
Sophisticated Analysis ◽  
Charge Calculations

The gas phase X-ray photoelectron spectra, XPS, were observed for the series C6F5X (X = F, Cl, I, Br, H). Binding energies were determined from the spectra using the ESCAPLOT Program. Charge calculations were carried out using Equalization of Electronegativity, CNDO/2, and ACHARGE approaches on each molecule. The more sophisticated analysis leads to the following equation correlating the (C 1s) binding energies and the atomic charges qi[Formula: see text]

scholarly journals Influence of the Substituted Ethylenediamine Ligand on the Structure and Properties of [Cu(diamine)2Zn(NCS)4]∙Solv. Compounds

Crystals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 637
Author(s):  
Natalia Tereba ◽  
Tadeusz M. Muzioł ◽  
Robert Podgajny ◽  
Grzegorz Wrzeszcz
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Magnetic Interaction ◽  
Structural Features ◽  
Molecular Formula ◽  
Structure And Properties ◽  
Magnetic Studies ◽  
Paramagnetic Resonance ◽  
X Ray ◽  
Ethylenediamine Ligand ◽  
Electron Paramagnetic

In this paper, three new heterometallic compounds were described and compared with the molecular formula [Cu(pn)2Zn(NCS)4] (1), [Cu(N,N-Me2-en)2Zn(NCS)4] (2), [Cu(N-Me-en)2Zn(NCS)4]∙½H2O (3) where pn = 1,2−diaminopropane, N,N-Me2-en = N,N‒dimethylethylenediamine and N-Me-en = N-methylethylenediamine, respectively. The compounds mentioned above were characterized by elemental analysis, infrared (IR), electronic, electron paramagnetic resonance (EPR) spectra, and magnetic studies. Crystal structures for 1 and 2 were determined by X-ray analysis. Copper(II) in these complexes adopts 4 + 2 coordination with two elongated (in 2 very long and considered as semi-coordination) Cu-S bonds. The Cu-N and Cu-S bond lengths depend on substituent position affecting steric hindrance and hence a topology of the chain. Both chains form different zigzag patterns characterized by one or two Cu-Zn distance values. Weak magnetic interaction is observed, ferromagnetic in the case of 1 and antiferromagnetic in the case of 2, due to diversity of the above structural features.

scholarly journals Mixed-matrix membranes with enhanced antifouling activity: probing the surface-tailoring potential of Tiron and chromotropic acid for nano-TiO 2

2017 ◽  
Vol 4 (9) ◽  
pp. 170368 ◽  
Author(s):  
Avishek Pal ◽  
T. K. Dey ◽  
A. K. Debnath ◽  
Bharat Bhushan ◽  
A. K. Sahu ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Structural Features ◽  
Chromotropic Acid ◽  
Mixed Matrix Membranes ◽  
Transmembrane Pressure ◽  
X Ray Diffraction ◽  
Mixed Matrix ◽  
Antifouling Activity ◽  
X Ray ◽  
Matrix Membranes

Mixed-matrix membranes (MMMs) were developed by impregnating organofunctionalized nanoadditives within fouling-susceptible polysulfone matrix following the non-solvent induced phase separation (NIPS) method. The facile functionalization of nanoparticles of anatase TiO 2 (nano-TiO 2 ) by using two different organoligands, viz . Tiron and chromotropic acid, was carried out to obtain organofunctionalized nanoadditives, F T -nano-TiO 2 and F C -nano-TiO 2 , respectively. The structural features of nanoadditives were evaluated by X-ray diffraction, X-ray photoelectron spectroscopy, Raman and Fourier transform infrared spectroscopy, which established that Tiron leads to the blending of chelating and bridging bidentate geometries for F T -nano-TiO 2 , whereas chromotropic acid produces bridging bidentate as well as monodentate geometries for F C -nano-TiO 2 . The surface chemistry of the studied membranes, polysulfone (Psf): F T -nano-TiO 2 UF and Psf: F C -nano-TiO 2 UF, was profoundly influenced by the benign distributions of the nanoadditives enriched with distinctly charged sites ( − SO 3 − H + ), as evidenced by superior morphology, improved topography, enhanced surface hydrophilicity and altered electrokinetic features. The membranes exhibited enhanced solvent throughputs, viz . 3500–4000 and 3400–4300 LMD at 1 bar of transmembrane pressure, without significant compromise in their rejection attributes. The flux recovery ratios and fouling resistive behaviours of MMMs towards bovine serum albumin indicated that the nanoadditives could impart stable and appreciable antifouling activity, potentially aiding in a sustainable ultrafiltration performance.

The application of gas phase and solid state X-ray photoelectron spectroscopy to the investigation of derivatives containing the repeating SN unit

1980 ◽  
Vol 1 (2) ◽  
pp. 161-173 ◽  
Author(s):  
Patrick Brant ◽  
David C. Weber ◽  
Curtis T. Ewing ◽  
Forrest L. Carter ◽  
Joseph A. Hashmall
Keyword(s):  
Solid State ◽  
Gas Phase ◽  
Photoelectron Spectroscopy ◽  
X Ray

scholarly journals Особенности формирования и структуры ленгмюровских пленок титаната бария

2019 ◽  
Vol 89 (8) ◽  
pp. 1238
Author(s):  
А.П. Кузьменко ◽  
И.В. Чухаева ◽  
П.В. Абакумов
Keyword(s):  
Barium Titanate ◽  
Photoelectron Spectroscopy ◽  
Chemical Elements ◽  
Structural Features ◽  
Hydrodynamic Diameter ◽  
Colloidal System ◽  
X Ray ◽  
Optimum Parameters ◽  
Barium Titanate Nanoparticles ◽  
20 Nm

With the use of the Langmuir-Blodgett (LB) method on the KSV NIMA 2002 plant, ferro-electric films of the stabilized barium titanate (ST BTO) from colloidal system of sodium oleate aqueous solution have been produced, which were studied with small angle X-ray scattering and dynamic light scattering techniques. Coagulants with the most characteristic hydrodynamic diameter ~ 200 nm are found and the physical model of their formation from barium titanate nanoparticles (~ 20 nm) in this colloidal system is proposed. By means of compression-expansion isotherms with the use of a MicroBAM micro-scope and the device for measurement of surface potential SPOT, optimum parameters of sedimentation are determined, which made it possible to produce uniform ferroelectric films with ST BTO particles of ~ 20 nm in size and a forbidden band width of 3.6 eV. With scanning probe and electron microscopy, vibrational and X-ray photoelectron spectroscopy, and also X-ray diffractometry, topological and structural features and distri-bution of chemical elements in the produced films on different substrates have been stud-ied.

scholarly journals Photoactivity of Titanium Dioxide Foams

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Maryam Jami ◽  
Ralf Dillert ◽  
Yanpeng Suo ◽  
Detlef W. Bahnemann ◽  
Michael Wark
Keyword(s):  
Gas Phase ◽  
Photoelectron Spectroscopy ◽  
Colloidal Suspensions ◽  
Air Purification ◽  
Semiconductor Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mechanical Stirring ◽  
Amphiphilic Molecules ◽  
Oxidation Of No

TiO2 foams have been prepared by a simple mechanical stirring method. Short-chain amphiphilic molecules have been used to stabilize colloidal suspensions of TiO2 nanoparticles. TiO2 foams were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-vis absorption spectroscopy, and scanning electron microscopy (SEM). The photoassisted oxidation of NO in the gas phase according to ISO 22197-1 has been used to compare the photoactivity of the newly prepared TiO2 foams to that of the original powders. The results showed that the photoactivity is increased up to about 135%. Foam structures seem to be a good means of improving the photoactivity of semiconductor materials and can readily be used for applications such as air purification devices.

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