International Journal of Nano and Material Sciences
ISSN: 2166-0182 (online)Search Article(s) by:
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Current Issue: Vol. 7 No. 1or Keyword in Title:
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Table of Content for Vol. 7 No. 1, 2018

Enhancement of Mechanical Properties of Melt-spun Process Al-Li Based Metallic Alloys for Aerospace Applications
Adel.S.Waqlan, Rizk Mostafa Shalaby and Mustafa Kamal
 PP. 1 - 15
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ABSTRACT: Mechanical testing plays a significant role in evaluating properties of engineering materials, add to in developing new materials and in controlling the quality of materials for use in design and construction to using as part of an engineering structure for aerospace applications. In this study, Al-2Li-Cux (where x= 0.1, 0.3, 0.5, 0.7 and 1wt. %) alloys were produced by melt-spun technique, examined by different techniques. XRD and Differential scanning calorimetry shows that intermetallic compound (IMC) θ"(Al2Cu) formation, led to decreasing of thermal properties, melting temperature range (ΔT), energy transferred and tensile strength, increasing internal friction, due to the impact of the solute atoms upon the solvent lattice and the interaction of difference atomic species. On the contrary, alloys that do not formation θ"(Al2Cu), it"s observed we have achieved significant improvements in mechanical properties and tensile strength (strength/density) and stiffness (elastic modulus/density) with small copper additions that are promising in the aerospace industry. It"s obvious that best values of young modulus and ultimate tensile strength are 112 GPa and 514 MPa at 0.3wt%Cu, respectively. It was found that the degree of the yield point effect is influenced by the amounts of the solute atoms, the interaction energy between the solute atoms and the dislocations.

Mangrove Leaves Aqueous Extract Mediated Green Synthesis of C-doped TiO2 Nanoparticles and Their Ecotoxic Effect on Rotifers
Mahmoud A. Mousa, Ahmed El Nemr, Esam A. Gomaa, Shady M. Eldafrawy and Elsayed T. Helmy
 PP. 16 - 30
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ABSTRACT: In this research paper, a low-cost and simple process which allows large-scale preparation of carbon-doped TiO2(C-TiO2) was prepared greenly using mangrove leaves aqueous extract, nanoparticles (NPs) are photoactive. Characterization of prepared NPs were done using FTIR and XRD techniques. The toxic activity on rotifers was evaluated using different volumes of suspended aqueous solution (1 g/100 ml) of C-TiO2 at various times (0.5, 1, 2, 4 and 24 h) at room temperature in absence and in presence of visible light source. The data show anatase structure with a diameter of 3 nm. The toxicity analysis results demonstrate that the different added suspended volumes of C-TiO2 NPs show very low immobilization degree with a maximum value of 4% after exposing to high volume of the suspended TiO2 (5 ml) and a high time of exposure (24 h) in darkness. While in presence of light source C-TiO2 have less toxic effect, where immobilization decrease by increasing the concentration of doped titania to reach the maximum value (1 %) after exposure for 24 h. The data show that C-TiO2 has no effect on rotifer immobilization using different concentrations at different times except for suspended volumes 4 and 5 ml of titania which have the slight effect and that may related to testing conditions. C-TiO2 show low toxicity which increases with increasing the concentration to attain a maximum value at high concentration at which 5% of rotifer died after 24 h and its immobilization reaches to 12% in darkness. Overall, the best data are obtained in presence of visible light source.