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aluminum-titanates
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Are aluminium titanate-based nanostructures new photocatalytic materials? Possibilities and perspectives
, Article Journal of Photochemistry and Photobiology A: Chemistry ; Volume 353 , 2018 , Pages 316-324 ; 10106030 (ISSN) ; Azarniya, A ; Madaah Hosseini, H. R ; Jafari, S ; Sharif University of Technology
Elsevier B.V
2018
Abstract
Nanostructured aluminum titanate (AT) was synthesized by the sol-gel method. The calcination temperature was selected as a processing variable to obtain different phase ratios of AT and its parent phases i.e. TiO2 and Al2O3. The main aim behind the present work was to cast light on the photocatalytic performance of AT-based nanocomposites and evaluate their capability to serve as a novel photocatalyst. X-ray diffraction (XRD) analysis and field-emission scanning electron microscopy (FE-SEM) studies were conducted to evaluate the microstructure-sensitive properties of the synthesized powders. Diffuse reflectance spectroscopy (DRS) and the methylene blue degradation test were carried out to...
Synthesis of a Superhydrophilic Self-Cleaning Material Based on Nanostructured Aluminum Titanite: Investigation of Surface Chemistry and Surface Energy
, M.Sc. Thesis Sharif University of Technology ; Madaah Hosseini, Hamid Reza (Supervisor)
Abstract
This research aims to enhance the wetting behavior of nanostructured aluminum titanate to improve adsorption and photocatalytic performance. In this study, heterogeneous nanostructures based on aluminum titanate were synthesized using the sol-gel method and modified with monohydrate citric acid. The stability of colloidal solutions was investigated by varying reaction conditions such as temperature, time, and modifier quantity. Analysis through FTIR and EDS confirmed the presence of carboxyl groups on the material's surface. XRD analysis indicated the existence of aluminum titanate, titanium oxide, and aluminum oxide phases. FESEM results revealed a significant population of agglomerates due...
Fabrication and Characterization of Al/Al3Ti-Al2O3 Composites by Powder Metallurgy and Sol Gel and Consideration of Mechanical Properties and their Correlation with the Microstructure Evolution
, M.Sc. Thesis Sharif University of Technology ; Maddah Hosseini, Hamid Reza (Supervisor)
Abstract
In the present research, a novel method for the fabrication of Al/Al3 Ti-Al2O3 composites and nanocomposites based on the thermal degradation of the refectory ceramic “Aluminium Titanate (AT)” or Al2TiO5 by powder metallurgy route. This research encompasses some precise subsequent steps. At first stage, nanostructured aluminium titanate nanofibers and particles were synthesized via a citrate sol gel process in which citric acid was used as a chelating agent. At second step, the possible chemical reactions between Al and aluminium titanate were taken into consideration both in powder form and in bulk form. Thermal analysis results indicated that it is feasible to decompose aluminium titanate...
Thermal stability and strain sensitivity of nanostructured aluminum titanate (Al2TiO5)
, Article Materials Chemistry and Physics ; Volume 223 , 2019 , Pages 202-208 ; 02540584 (ISSN) ; Azarniya, A ; Madaah Hosseini, H. R ; Abedi, M ; Moskovskikh, D ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
In the present work, nanostructured aluminum titanate (Al2TiO5 or AT) was synthesized by the sol-gel method and potential effects of mechanical strain on its phase analysis, morphology, and thermal stability were investigated in some details for the first time, because the thermal instability of AT is beneficial to the fabrication of in-situ aluminum matrix composites. To characterize the particle distribution, microstructure and thermal durability of AT after the strain induction, field-emission scanning electron microscope (FE-SEM), differential scanning calorimetry (DSC), and x-ray diffraction analysis (XRD) were utilized. The experimental results showed that a 3-h ball milling process...
Thermal decomposition of nanostructured Aluminum Titanate in an active Al matrix: A novel approach to fabrication of in situ Al/Al2O3-Al3Ti composites
, Article Materials and Design ; Volume 88 , 2015 , Pages 932-941 ; 02641275 (ISSN) ; Hosseini, H. R. M ; Jafari, M ; Bagheri, N ; Sharif University of Technology
Elsevier Ltd
2015
Abstract
The thermal decomposition of Aluminum Titanate in exposure to pure Aluminum was examined both in powder and in bulk form. Optical microscopy, FE-SEM, XRD, DSC and TGA examinations were conducted to take the possible chemical reactions between Aluminum Titanate and Al into consideration. It was found that as Aluminum Titanate particles are exposed to Al matrix, the thermal stability of Aluminum Titanate is degraded and its decomposition temperature is reduced from 850°C to 550°C. Also, the chemical reactions between Aluminum Titanate and Al start along the interfaces, and the reaction products, i.e. Al3Ti, Al2O3, TiO2 and O2 gas are left there. A mechanism was suggested to describe the...
Thermomechanical synthesis of hybrid in-situ Al-(Al3Ti+Al2O3) composites through nanoscale Al-Al2TiO5 reactive system
, Article Journal of Alloys and Compounds ; Volume 789 , 2019 , Pages 493-505 ; 09258388 (ISSN) ; Azarniya, A ; Madaah Hosseini, H. R ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
In this work, nanostructured aluminum titanate (Al2TiO5 or AT) was synthesized by the citrate sol gel method. Then, different volume fractions of this ceramic were blended with Al powder through different durations of the high-energy vibratory milling. The effect of mechanical milling on the thermal degradation of AT in exposure to Al and formation mechanism of in-situ Al2O3 and Al3Ti particles were explored in three conditions: (i) in the powder form; (ii) after annealing of green compact; and (iii) after hot extrusion. In the powder form, it was shown that the mechanical milling is able to significantly diminish the thermal stability of AT, so that the required temperature for the Al3Ti...
Synthesis and characterization of diopside glass-ceramic matrix composite reinforced with aluminum titanate
, Article Ceramics International ; Volume 35, Issue 4 , 2009 , Pages 1447-1452 ; 02728842 (ISSN) ; Alizadeh, P ; Eftekhari Yekta, B ; Molaie, F ; Ghafoorian, N ; Montazerian, M ; Sharif University of Technology
2009
Abstract
Glass-ceramic composites in the SiO2-CaO-MgO-(Na2O) system, reinforced with 5, 10 and 20 wt.% aluminum titanate were synthesized by pressureless sintering. Optimum sintering temperatures with maximum relative density were determined for each composition. The composites were fired above the crystallization peak temperature of glass-ceramic. Mechanical properties of glass-ceramic and sintered composites, such as fracture toughness, flexural strength and Vickers microhardness, were investigated. The sintered composites were characterized by scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS) and X-ray diffraction (XRD). The results showed that the composite containing 10...