Papers by Ilmutdin Abdulagatov
Fluid Phase Equilibria, Dec 1, 2014
Densities of ternary water ? 1-propanol ? KNO 3 mixtures have been measured over the temperature ... more Densities of ternary water ? 1-propanol ? KNO 3 mixtures have been measured over the temperature range from 303 to 448 K and at pressures up to 35 MPa using a constant-volume piezometer immersed in a precision liquid thermostat. The effect of salt and alcohol concentrations on the ternary mixture densities and partial molar volumes were studied. The derived volumetric property such as partial molar volumes of the salt (KNO 3 , " V 2 ) and the alcohol (1-propanol, " V 1 ) were calculated using the measured values of the densities. The volumetric behavior of the ternary mixtures was interpreted in terms of changes in the water structure caused by the added alcohol and salt. It was shown that changes in the volumetric behavior of the complex solutions are the results of the structural changes in water structure caused by solutes (alcohol and salt).
Journal of Chemical & Engineering Data, Feb 3, 2022
Journal of Solution Chemistry, May 1, 2006
The viscosity of five [(0.27, 0.58, 0.92, 1.73, and 2.63) mol‚kg -1 ] binary aqueous SrCl 2 solut... more The viscosity of five [(0.27, 0.58, 0.92, 1.73, and 2.63) mol‚kg -1 ] binary aqueous SrCl 2 solutions has been measured with a capillary flow technique. Measurements were made at pressures up to 20 MPa. The range of temperature was (293 to 473) K. The total uncertainties in viscosity, pressure, temperature, and composition measurements were estimated to be less than 1.6 %, 0.05 %, 15 mK, and 0.02 %, respectively. The effects of temperature, pressure, and concentration on the viscosity of SrCl 2 (aq) solutions were studied. The temperature and pressure coefficients of the viscosity of SrCl 2 (aq) were studied as a function of concentration and temperature. The measured values of viscosity were compared with data, predictions, and correlations reported in the literature. The viscosity data were used to accurately calculate the physical meaning parameters (viscosity A and B coefficients) in the extended Jones-Dole equation for the relative viscosity (η/η 0 ). Various theoretical models [absolute rate theory, TTG (Tammann-Tait-Gibson) model, extended Einstein model] were used to accurately represent the measured values of viscosity. The values of hydrodynamic molar volume, V k (effective rigid molar volume of salt), were calculated using the present experimental viscosity data. The high-pressure viscosity measurements were used to test the predictive capability of the TTG model.
The Journal of Chemical Thermodynamics, Oct 1, 2004
ABSTRACT Densities of five aqueous LiI solutions (0.0906, 0.2832, 0.6621, 1.6046, and 3.0886) mol... more ABSTRACT Densities of five aqueous LiI solutions (0.0906, 0.2832, 0.6621, 1.6046, and 3.0886) mol·kg−1 H2O were measured in the liquid phase with a constant-volume piezometer immersed in a precision liquid thermostat. Measurements were made along various isotherms between (296.95 and 600.25) K. The range of pressure was (0.1 to 30) MPa. The total uncertainty of density, pressure, temperature, and concentration measurements was estimated to be less than 0.06%, 0.05%, 15 mK, and 0.014%, respectively. To check and confirm the accuracy of the measurements, (p,Vm,T,x) data were taken for pure water at selected temperatures and pressures. Experimental and calculated (IAPWS formulation) densities for pure water show excellent agreement within their experimental uncertainties (average absolute deviation is 0.02%). Values of saturated densities were determined by extrapolating experimental p−ρ data to the vapour pressure at fixed temperature and composition using a linear interpolating equation. Apparent molar volumes were derived using measured values of density for solutions and pure water. The apparent molar volumes were extrapolated to zero concentration (m→0) to yield partial molar volumes of electrolyte (LiI) at infinite dilution. The temperature, pressure, and concentration dependence of apparent and partial molar volumes was studied. The measured values of density, apparent and partial molar volume were compared with data reported in the literature by other authors. A polynomial type of equation of state for specific volume was obtained as a function of temperature, pressure, and composition by a least-squares method using the experimental data. The average absolute deviation (AAD) between measured and calculated values from this polynomial equation for density was 0.065%.
Geothermics, Sep 1, 2021
Abstract As a part of our long-term continuing program of experimental study of the thermodynamic... more Abstract As a part of our long-term continuing program of experimental study of the thermodynamic and transport properties of geothermal fluids, the high-temperature and high-pressure densities and vapor-pressures of two natural geothermal fluids from East Turkey Geothermal Field (Keklik Magarasi and Afyon geothermal wells) have been measured over the temperature range from (274 to 413) K and at pressure up to 100 MPa. The measurements of the PVT properties were made using vibrating tube densitometer (VTD) DMA HPM (AntonPaar, Austria). The vapor-pressure was measured using absolute static method. The standard uncertainty of the density, pressure, and temperature measurements is estimated to be (0.0001 to 0.0003 depending on T and P ranges), 0.001, and 10 mK, respectively. Measured values of high-temperature and high-pressure density (PVT data) were used to estimate Tait’s parameters (c and B) and their temperature dependence. Developed Tait-type equation of state has been be used to calculate other derived key thermodynamic properties ( β S , β T , α P , γ V , H , S, U, u, C P , C V ) of the geothermal waters at high-temperatures and high-pressures, which are very important for modeling of the geothermal reservoirs and optimization of the geothermal energy production processes. The measured values of PVT property of the geothermal water samples were also used to check and confirm reliability and accuracy of the high-temperature and high-pressure prediction method for geothermal fluids using only densities at atmospheric pressure and room temperature.
Research Square (Research Square), May 19, 2023
A high-temperature and high-pressure optical cell VLE apparatus has been applied to measure phase... more A high-temperature and high-pressure optical cell VLE apparatus has been applied to measure phase equilibrium properties of n-tetradecane in the supercritical binary solvent (0.367propane+0.633 nbutane mass fraction) at temperatures of 413.15 K, 433.15 K, and 453.15 K between of pressures (0.9 and 6.6) MPa. The combined expanded uncertainty of the temperature, pressure, and concentration measurements at 0.95 confidence level with a coverage factor of k = 2 is estimated to be 0.15 K, 0.0022, and 0.035, respectively. The critical parameters (TC, PC, C w ) were determined based on the measured isothermal phase equilibrium data of the ternary system n-tetradecane+ propane/n-butane. It is shown that the critical temperature and pressure of the n-tetradecane+ propane/n-butane system increases with concentration of n-tetradecane increases.
Russian Journal of Applied Chemistry, Jul 1, 2021
Titanium–vanadium oxide (TixVyOz) nanofilms were prepared by atomic layer deposition using TiCl4,... more Titanium–vanadium oxide (TixVyOz) nanofilms were prepared by atomic layer deposition using TiCl4, VOCl3, and water. The film growth was monitored in situ by quartz crystal microbalance. At a deposition temperature of 115°С, the films grew linearly with number of deposition cycles, and the surface reactions of the precursors were self-limiting. Films of two compositions, Ti0.9V0.1O3 and Ti0.5V0.5O3, were prepared; their density was 3.5 and 3.3 g cm–3, respectively. The content of Cl impurities in the films obtained was less than 0.2 at. %, the coating roughness was ~4.0 Å, and the band gap was 3.05 and 2.85 eV for Ti0.9V0.1O3 and Ti0.5V0.5O3, respectively. All the films obtained were amorphous. The heat treatment of the Ti0.5V0.5O3 film in air led to the formation of heterostructural TiO2–V2O5 coatings. At 450°С, nanostructures consisting of anatase TiO2 and nanorods of microcrystalline V2O5 were formed. An increase in the annealing temperature to 500°С led to increase in the length of V2O5 nanowires to tens of micrometers and to their separation from the substrate, and after annealing at 550°С the substrate surface was uniformly coated with nanoparticles. The films obtained in this study can find use in the development of catalysts and power storage systems.
Russian Journal of Physical Chemistry A, Jul 1, 2021
Molecular layer deposition (MLD) of thin polyamide films was performed using 1,3,5-benzenetricarb... more Molecular layer deposition (MLD) of thin polyamide films was performed using 1,3,5-benzenetricarbonyltrichloride (trimesoyl chloride, TMC) and 1,2-ethylenediamine (EDA) as precursors at a temperature of 120°С. The growth rate at this temperature was 1.85 nm/cycle. In situ quartz crystal microbalance (QCM) study was used to determine the film growth behavior. QCM signal showed linear film growth with an increasing number of MLD cycles. Pyrolysis of MLD polyamide films on Si(111) was conducted at temperatures of 1100 and 1300°С and a pressure of 10−7 Torr. Thin heteroepitaxial films of β-SiC (3C–SiC) on the Si(111) were obtained as a result of a solid-phase reaction between Si and C at 1300°С. A variety of high-resolution spectroscopic techniques were used to determine the elemental composition and crystal structure of organic and ceramic films.
Russian Journal of Applied Chemistry, Aug 1, 2016
Template two step electrodeposition method and atomic layer deposition were used to synthesize co... more Template two step electrodeposition method and atomic layer deposition were used to synthesize copper nanowires of varied length (1.2 to 26.2 μm) and copper nanowires coated with titanium dioxide. As a result of the atomic layer deposition of TiO 2 , coated nanowires demonstrated an up to 10-fold decrease in the wetting angle, compared with uncoated nanowires. It was found the dissipation rate is substantially higher for nanowires coated by the atomic layer deposition method (100 s) as compared with the uncoated copper nanowires (400 s), which assumes the positive properties of water propagation along the surface, necessary for improving the heat transfer. It was also found that the water contact angle for uncoated nanowires and those coated with TiO 2 by the atomic layer deposition (ALD) gradually increases as the samples are kept in air. A gradual increase in wettability was also observed for smooth silicon wafers coated by ALD of TiO 2 , which were exposed to air. On the coated silicon substrates, the wetting angle gradually increased from 10° to approximately 56° in the course of four days. In addition, it was shown that copper nanowires coated with TiO 2 by the atomic layer deposition method have an excellent corrosion resistance, compared with uncoated nanowires, when brought in contact with air and water.
Russian Microelectronics, 2019
In this work, atomic-layer deposition (ALD) of yttrium oxide (Y 2 O 3) was demonstrated using tri... more In this work, atomic-layer deposition (ALD) of yttrium oxide (Y 2 O 3) was demonstrated using tris(butylcyclopentadienyl)yttrium (Y(CpBut) 3) and H 2 O. Yttrium precursor showed thermal stability and a high reactivity in surface reactions with H 2 O. In situ monitoring of the deposition process by quartz crystal microbalance (QCM) showed that the growth of oxide is accompanied by the absorption of water into the bulk of the film, which can lead to chemical vapor deposition (CVD) type processes. Reducing amount of dosed water as well as purge time extension during ALD cycling allow to mitigate the CVD effects. The Y 2 O 3 film growth rate 230°C varied depending on the number of cycles and had maximum value of 1.7 Å/cycle. The films obtained at 230°C had a cubic polycrystalline structure with an average density of 96% of the Y 2 O 3 bulk density. The X-ray photoelectron spectroscopy (XPS) measurements showed a carbon impurity level below the detections limit (~0.2 at %). The O/Y atomic concentration ratio estimated by Rutherford backscattering spectroscopy (RBS) was ~1.58. As deposited Y 2 O 3 films had a refractive index of 1.85 (at 632.8 nm), whereas with protective ALD Al 2 O 3 film, the refractive index was 1.73.
Russian Journal of General Chemistry, Aug 1, 2018
Thin films of aluminum nitride and oxynitride were deposited by atomic layer deposition (ALD) in ... more Thin films of aluminum nitride and oxynitride were deposited by atomic layer deposition (ALD) in the temperature range from 170 to 290°C (optimal deposition temperature 200-230°C). Tris(dimethylamido) aluminum and ammonia were used as precursors for the atomic layer deposition of aluminum nitride (AlN). The average AlN film thickness per ALD cycle (deposition rate) at 200°C was ~0.8 Å. Films were deposited on a silicon <100> substracte with a native oxide layer. The N/Al atomic concentration ratio in the obtained films was ~1.3. Aluminum oxynitride films obtained by periodical dose of water vapor in the course of atomic layer deposition of AlN at 200°C. The composition of the deposited oxynitride films was Al 0.5 O 0.43 N 0.07 .
Russian Journal of Physical Chemistry A, Oct 1, 2022
Russian Journal of General Chemistry, Aug 1, 2022
Вестник Дагестанского государственного университета, Nov 10, 2016
In the given research copper nanowires ranging in length from 1.6 to 26.2 µm were synthethized by... more In the given research copper nanowires ranging in length from 1.6 to 26.2 µm were synthethized by the method of two-step electrodeposition. Another goal was to study the effect of the length on their wettability. It was found that the value of contact wetting angle for nanowires begins at 50 0 with the length of 1,2µm, reaching its maximum at 100 0 with the length of 1,6µm and then sharply decreases to 20 0 , starting with the length of 1,6µm and more. Moreover, it was revealed that the value of wetting angle for nanowires gradually increases in the open air. This is due to the Cassie-Baxters's wetting effect in addition to Wenzel condition, observed at a lower wetting angle.
Russian Microelectronics, 2018
Aluminum nitride (AlNx) films were obtained by atomic layer deposition (ALD) using tris(diethylam... more Aluminum nitride (AlNx) films were obtained by atomic layer deposition (ALD) using tris(diethylamido) aluminum(III) (TDEAA) and hydrazine (N2H4) or ammonia (NH3). The quartz crystal microbalance (QCM) data showed that the surface reactions of TDEAA and N2H4 (or NH3) at temperatures from 150 to 225°C were self-limiting. The rates of deposition of the nitride film at 200°C for systems with N2H4 and NH3 coincided: ~1.1 Å/cycle. The ALD AlN films obtained at 200°C using hydrazine had higher density (2.36 g/cm3, 72.4% of bulk density) than those obtained with ammonia (2.22 g/cm3, 68%). The elemental analysis of the film deposited using TDEAA/N2H4 at 200°C showed the presence of carbon (~1.4 at %), oxygen (~3.2 at %), and hydrogen (22.6 at %) impurities. The N/Al atomic concentration ratio was ~1.3. The residual impurity content in the case of N2H4 was lower than for NH3. In general, it was confirmed that hydrazine has a more preferable surface thermochemistry than ammonia.
Вестник Санкт-Петербургского университета. Серия 4. Физика. Химия, 2013
Russian journal of physical chemistry/Russian journal of physical chemistry. A, May 30, 2024
Teplofizika vysokih temperatur, May 1, 2023
Neorganičeskie materialy, Apr 1, 2023
High temperature, Jun 1, 2023
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Papers by Ilmutdin Abdulagatov