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Saeid Alamdar Milani,Mohammad Karimi 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.4
The 3-aminopropyltriethoxysilane-modified titanosilicate was prepared as an alternative for developing efficient adsorbents of heavy metals. The obtained material was characterized by X-ray diffraction analysis, infrared spectroscopy, textural analysis, and scanning electron microscopy. Adsorption of thorium from aqueous solutions was investigated by adsorption isotherms, kinetic and thermodynamic studies. The isothermal data were found to be correlated with the Langmuir model. The maximum sorption capacity of Th(IV) was 83.4mg g−1. The experimental data show that the external diffusion and intra-particular diffusion are significant in the sorption of thorium. The thermodynamic parameters indicated that the sorption process was physisorption, endothermic and spontaneous.
Farzan Karimi,Saeid Baghshahi,Mohsen Nouri Khezrabad,NASTARAN RIAHI-NOORI 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.4
In tile and ceramic industry, frits are used for producing opaque and glossy glazes. Commonly used frits are prepared by using opacifiers such as ZrO2 and TiO2, but the high price of these raw materials leads to a higher cost of the final product. In this research, an opaque frit containing in-situ synthesized Wollastonite (CaSiO3) and Diopside (CaMgSi2O6) was developed as a substitute for Zircon-containing frits. By choosing optimized proportions of oxides in the frit composition, sufficient crystallization occurred in MgO-CaO-Al2O3-ZnO-B2O3-SiO2-K2O-Na2O glass ceramic system. XRD, SEM, EDS, STA, and colorimetry (CIELab) tests were used to compare the prepared samples with a reference zircon containing one which is used in tile industry. The results showed that whiteness and glossiness indices of the prepared sample were 73.61 and 86.56, respectively, which are comparable with those of zircon-free reference sample with whiteness and glossiness indices of 77.05 and 89.22, respectively.
Ali Sabea Hammood,Mojtaba Esmailzadeh,Sayedeh Narjes Hosseini,Saeid Karimi,Irene Calliari,Luca Pezzato,Rob Brittain 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.2
This study examines the effect of various parameters of friction stir welding (FSW) on 2101 lean duplex stainless steel (LDSS) microstructural features, and corrosion properties in simulated body fluid (SBF) for possible biomedical applications. 2101 LDSS FSW joints were characterized using scanning electron microscopy (SEM). X-ray diffraction (XRD) was used to investigate changes to crystalline phases. The Corrosion behavior was evaluated in Ringer solution by Tafel potentiodynamic polarization (PDP), as well as by cyclic polarization (CP) and electrochemical impedance spectroscopy (EIS) tests. The microstructural observations show that the heat input was not high enough to form a heat affected zone (HAZ), with three separate zones identified around the weld zone. The three identified zones are: stir zone (SZ), thermomechanical affected zone (TMAZ) and base metal (BM). A positive linear correlation between the rotational speed and the corrosion resistance were detected, with the behavior related to the more balanced microstructure or to grain refinement.