فهرست مطالب

Advanced Ceramics Progress - Volume:2 Issue: 3, Summer 2016

Advanced Ceramics Progress
Volume:2 Issue: 3, Summer 2016

  • تاریخ انتشار: 1395/07/17
  • تعداد عناوین: 7
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  • Y. Ganjkhanlou, T. Ebadzadeh, M. Kazemzad Asiabi, A. Maghsoudi, M. Kianpour Rad Pages 1-4
    Electrodeposition of CuInSe2 (CIS) and CuInAlSe2 (CIAS) from aqueous solution has been systematically investigated by cyclic voltammetery implementing different scan rates. It has been shown that electrodeposited CIS and CIAS have been formed on the substrate through electrochemical-chemical interaction of reduces species on the substrate. From the obtained results, it could be inferred that Induced electrodeposition is the main mechanism of incorporation of aluminium and indium in the deposited layer. Effect of electrodeposition potential on the composition of the prepared film has also been investigated and it was observed that in potential close to -0.7 V stoichiometery close to desired stoichiometery of CIAS solar cells could be obtained.
    Keywords: Cyclic Voltammetry, Scan Rate, Elecrodeposition, CuInAlSe2, Mechanism
  • T. Ahmadi, A. Monshi, V. Mortazavi, M. H. Fathi, B. Hashemibeni, A. A. Sharifnabi Pages 5-11
    Hydroxyapatite (HA) is perhaps the most attractive material for bone repair, replacement and regeneration, due to its chemical composition and crystallographic structure which are similar to those of natural bone mineral. However, replacement of various elements and compounds in HA, could improve biological properties of this material. The aim of this study was preparation, characterization and bioactivity evaluation of silicon and magnesium co-doped fluorapatite (Si-Mg-FA). Structural characterizations of synthesized powder were performed using X-ray diffraction (XRD) analysis; Fourier transformed infrared spectroscopy (FTIR) and transmission electron microscopy (TEM) techniques. In vitro bioactivity was evaluated in simulated body fluid (SBF) at 37˚C for up to 28 days. Cell viability and cell attachment were studied by MTT assay and scanning electron microscopy (SEM). The results showed that nanosized (~40nm) single-phase Si-Mg-FA powder was synthesized after 12 h of ball milling. In vitro examinations revealed the amount of bone-like apatite precipitated on Si-Mg-FA nanopowder was significantly higher than FA. The cell culture medium containing Si-Mg-FA showed more cell proliferation and cell viability than FA. It could be concluded that doping Si and Mg into FA improves the bioactivity and cell viability, therefore, has a good potential to be used as bone substitution material.
    Keywords: Mechanical activation, Si-Mg-doped fluorapatite, Nanostructured materials, In-Vitro Biocompatibility, Biomedical applications
  • Ali Mortazavi, M. Razavi, T. Ebadzadeh, Ali Sedaghat Ahangari Pages 12-16
    In this paper, the production of Al2O3-Mo nano-composites via mechanical milling was investigated. Molybdenum and alumina powders with certain ratios were grounded in a planetary ball mill at different times. XRD technique was used to determine the crystallite size of the milled powders. The microstructure of milled powders was studied using optical and electron microscopes. The crystallite sizes of milled powders were in nano-meter scale and increasing the milling time led to decreasing of crystallite size. Microstructural investigations showed uniform distribution of ultrafine second phase in matrix.
    Keywords: Nano-composite, Alumina matrix, Microstructure
  • F. Lak, M. Rezvani Pages 17-24
    Borosilicate BK7 glasses doped with different amounts of CeO2 (0.5,1,1.5%) were prepared by the convenient melting process in this work. DTA analysis proved that 0.5-1% CeO2 has a network modifier role and then up to 1.5% it shows network former role.For structural studies, FT-IR and Raman spectroscopy were carried out. Fermi energy level, direct/ indirect optical band gap and Urbach energy were determined by using UV-VIS spectra and calculating absorption and extinction coefficients.
    Keywords: Borosilicate glasses, BK7 glass, CeO2, optical properties
  • L. Nikzad, S. Ghofrani, H. Majidian, T. Ebadzadeh Pages 25-28
    In this paper, effect of mechanical activation on microwave reactive sintering of MgO - TiO2 system was investigated. Mixtures of MgO and TiO2 were milled at different times. Mixed powders along with 10 h milled powders were chosen for microwave sintering between 1000- 1400⁰C. Results showed that increasing of temperature up to 1400̊C for mixed powders could not give rise to complete formation of Magnesium titanate phases and raw materials were in the products. Also the densities of these samples were about 3 g/Cm3. With milling of reactants up to 10 h, it seems reactions could be completed at 1000⁰C and the density was augmented to 3.58 g/Cm3. The samples were sintered at 1400⁰C in a microwave furnace exhibited good microwave dielectric properties while εr and tan δ were 16.3 and 0.0001 respectively.
    Keywords: mechanical milling, MgTiO3, microwave sintering
  • F. Farshidfar, M. Kazemzad Asiabi, Ali Khanlarkhani, M. Rezaei Pages 29-33
    1-butyl-3-methyl imidazolinium hydroxide ionic liquid (BMIm[OH]) is loaded on commercial low surface area Pd-Ag/α-Al2O3 solid ýcatalyst to enhance higher selectivity of acetylene partial hydrogenation. Different experimental techniques such as atomic absorption spectroscopy, surface area measurement and gas chromatography have been utilized to characterize chemical, structural and catalytic properties of the catalyst. Additionally, FT-IR spectra are collected to study the synthesized ionic liquid. The selectivity and activity of ýthe fresh and aged catalysts are compared for both ionic liquid free and loaded samples.ý
    Keywords: acetylene hydrogenation, BMIm[OH], ionic liquid, palladium, catalyst, FT-IR
  • A. Saraei, Mohammad J. Eshraghi, A. Massoudi Pages 34-37
    In this work, TiO2 nanostructures were grown on titanium thin films by electrochemical anodizing method. The bipolar resistive switching effect has been observed in Pt/TiO2/Ti device. Resistive switching characteristics indicated the TiO2 nanotubes are one of the potential materials for nonvolatile memory applications. Increasing anodizing duration will increase nanotube lengths which itself causes increase in high resistance and low resistance difference.
    Keywords: Anodized Titanium Dioxide, Resistive switching, Nanotubes