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Microwave Dehydration of Borax: Characterization, Dehydration Kinetics, and Modelling
Pleiades Publishing Ltd - Tập 48 - Trang 210-218 - 2022
Fatma Tugce Senberber Dumanli, Azmi Seyhun Kipcak, Emek Moroydor Derun
In the present study, borax (Na2B4O7·10H2O) was dehydrated using microwave radiation and the dehydration rate curves were calculated. The kinetic parameters and mathematical constants of several drying models were calculated from the dehydration curve data. The best model was selected using the statistical analyses of R2, χ2, and root mean square error. From the best model, the kinetic parameters ...... hiện toàn bộ
Effect of Bound Water on the Fractal Geometry of Nanosized Cracks in Glasses Prepared by Vacuum Pressure-Assisted Sintering
Pleiades Publishing Ltd - - 2001
A. E. Chmel', G. T. Petrovskii, A. D. Semenov, A. N. Smirnov, V. S. Shashkin
The vibrational properties of fractal nanocracks in vitreous SiO2samples prepared by vacuum pressure-assisted sintering are investigated by low-frequency Raman scattering spectroscopy. In the Raman spectrum, nanosized discontinuities with a fractal geometry manifest themselves in a specific frequency dependence of the scattering intensity: a monotonic decrease in the intensity according to the law...... hiện toàn bộ
Identification of photoluminescence centers in oxygen- and erbium-doped a-Si(H) films
Pleiades Publishing Ltd - Tập 37 - Trang 406-410 - 2011
G. A. Bordovskii, A. Yu. Dashina, A. S. Naletko, A. V. Marchenko, P. P. Seregin, E. I. Terukov
It has been shown that [Er-O] clusters play the role of photoluminescence centers in films of amorphous hydrogenated silicon a-Si(H) doped with oxygen and erbium. The local symmetry of Er3+ ions in clusters is the same as that in Er2O3. A decrease in the cluster size and an increase in the particle density result in the enhancement of the photoluminescence intensity of a-Si(H): Er at a wavelength ...... hiện toàn bộ
Synthesis and Research of the Properties of Lanthanum and Neodymium Indates
Pleiades Publishing Ltd - Tập 46 - Trang 434-439 - 2020
L. V. Morozova, I. A. Drozdova
Single-phase nanocrystalline (18–20 nm) lanthanum indate powder (LaInO3) and neodymium indate powder (NdInO3) with the structure of orthorhombic perovskite are synthesized by the coprecipitation of hydroxides with the simultaneous ultrasonic treatment of the precipitation and subsequent firing of the powder-precursors at a temperature of 700°C. Ceramic samples with an open porosity of 4 to 5% are ...... hiện toàn bộ
Effects of Different Quenching Rate on the Various Properties of Fe–Si–B Amorphous Alloy Prepared by Melt Spinning Method
Pleiades Publishing Ltd - Tập 49 - Trang 617-624 - 2023
Narges Amini, Safdar Habibi, Nahid Mohammadiparsa
In this work an attempt is made to study the impact of the quenching rate upon structure, hyperfine interactions, magnetic and mechanical properties of Fe78Si9B13 metallic glasses. Other involved parameters in melt spinning method were kept invariant. Analytical techniques comprising X-ray diffraction, transmission Mössbauer spectrometry, vibration sample magnetometer, Vickers microhardness and di...... hiện toàn bộ
Photon interaction parameters for some ZnO–Al2O3–Fe2O3–P2O5 glasses
Pleiades Publishing Ltd - Tập 43 - Trang 227-232 - 2017
Preet Kaur, Tejbir Singh, Devinder Singh
Some photon interaction parameters such as mass attenuation coefficient, effective atomic number, half value layer, mean free path and electron density for 15ZnO–(17.5–x)Al2O3–xFe2O3–67.5P2O5 glass system (x = 0, 7.5, 12.5, 17.5) and 15ZnO–(25–x)Al2O3–xFe2O3–60P2O5 glass system (x = 0, 25) have been investigated in the photon energy range of 1 keV to 100 GeV. It has been observed that all the phot...... hiện toàn bộ
Investigation of nanocomposites based on hydrated calcium phosphates and cellulose Acetobacter xylinum
Pleiades Publishing Ltd - - 2009
А. К. Хрипунов, Yu. G. Baklagina, V. A. Sinyaev, E. S. Shustikova, B. A. Paramanov, Д. А. Романов, R. Yu. Smyslov, А. С. Ткаченко
Physical and Mechanical Properties of Composite Ceramics in the ZrB2–SiC–MoSi2 System
Pleiades Publishing Ltd - - 2021
E. S. Motailo, L. A. Lisyanskii, С. В. Вихман, Д. Д. Несмелов
Synthesis of nanocomposite materials in the SnO2-NiO system
Pleiades Publishing Ltd - Tập 38 - Trang 131-136 - 2012
A. I. Aparnev, A. A. Golubchuk, I. S. Chukanov, N. F. Uvarov
The SnO2-NiO nanocomposites with the specific surface area on the order of 100 m2/g and the particle size of both phases of less than 10 nm have been synthesized by the sol-gel method with the subsequent annealing in the temperature interval 200–1000°C. It has been shown that, with an increase in the annealing temperature to 900°C, the specific surface area of the nanocomposites increases. This ef...... hiện toàn bộ
Stabilization of silver nanoparticles and clusters in porous zeolite matrices with Rho, Beta, and paulingite structures
Pleiades Publishing Ltd - Tập 41 - Trang 537-544 - 2015
O. Yu. Golubeva, N. Yu. Ul’yanova
Silver nanoparticles and clusters (Ag 2 + , Ag 4 + and Ag8) in zeolite matrices having the structures of paulingite, Rho, and Beta have been obtained using the method of chemical reduction of silver in the ionic form preliminarily introduced to the pores of the studied zeolites through ion exch...... hiện toàn bộ
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