International Journal of Nano and Material Sciences
ISSN: 2166-0182 (online)Search Article(s) by:
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Table of Content for Vol. 6 No. 1, 2017

Improvement of the Mechanical Properties of Sn-Ag-Sb Lead- Free Solders: Effects of Sb Addition and Rapidly Solidified
Mohammed, S. Gumaan, Esmail A. Ali, Rizk M.Shalaby, and Mustafa Kamal
      
 PP. 1 - 15
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ABSTRACT: The melt-spun processes of Sn-3.5 wt.%Ag and Sn-3.5 wt.%-Sbx (x = 0.1, 0.3, 0.5, 0.7 and 1.0 wt.%) where analyzed using an x-ray diffractometer, a differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). The results revealed that super saturated solid solution and intermetallic compounds (IMCs) were produced during melt-spun processes. The results revealed that there are more changes in thermal properties of these alloys due to structural reasons which are producing from micro-structural changes after Ag3Sn and AgSb Intermetallic compounds formation. The mechanical properties of the ternary Sn-Ag-Sb alloys have been improved after small alloying additions of Sb dramatically and rapidly solidified due to microstructure refining. The solder alloys have been withstanding creep deformation as show in their mechanical properties and creep results where the values of stress exponent and activation energy of Sn96-Ag3.5-Sb0.5 were 7.87 and 66.51 KJ/mol respectively which indicate to dislocation climb controlled by dislocation pipe diffusion. It is known that even≥ 0.1wt% level additions of Sb have significant effects on the microstructure of Sn-Ag solder alloys. Sb sup- presses the growth of β-Sn dendrites in favour of eutectic formation.


Photocatalytic Activity of GO/ZnWO4 Nanocomposite Prepared by Co-precipitation under Visible Light
Amr A. Ahmed, Ahmed A. Salah, Salem E. Samra, A. M. Youssef
      
 PP. 16 - 24
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ABSTRACT: Enhancement photocatalyst of reduced graphene oxide (GO/ZnWO4) nanocomposite was prepared by Co-precipitation method. The photocatalytic activity of GO/ZnWO4 was tested by photodegradation of Rhodamin B (RhB) under visible light irradiation. GO/ZnWO4 nanocomposite revealed high improved of photocatalytic performance from crystal ZnWO4 particles. The degradation of RhB was increased to 91.09 % in 60 min with the addition of GO as compared to pure ZnWO4 was 18.22% in 120 min. The remarkable photocatalytic activity was attributed to the efficient photosensitized (the photosensitization of GO).


Cobalt –Metal Organic Frameworks (Co-MOFs) Nanocatalyst: An Efficient Catalyst for the Preparation of 3, 4-Dihydropyrimidinone
Awad I. Ahmad, S. M. El-Dafrawy, Fares T. AL-Shorifi
      
 PP. 25 - 38
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ABSTRACT: Cobalt-metal organic frameworks (Co-MOFs) nanocatalyst was prepared by solvothermal method. Properties of Co-MOFs nanocatalyst were investigated by XRD, FT-IR, and TEM techniques. The surface acidity of the prepared Co-MOF sample was measured by potentiometric titration. The catalytic activity of Co-MOFs nanocatalyst was tested by the Biginelli reaction (3, 4-dihydropyrimidinone). The Co-MOFs nanocatalyst was reused for several times (four times) with good yield from 3, 4-dyhydropyrimidinone.


Effect of Irradiation on the Structural and Physical Properties of Binary Eutectic Alloys Using Rapidly Solidified from Melt
Adel. S. Waqlan
      
 PP. 39 - 53
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ABSTRACT: Microstructure, electrical and mechanical properties of melt-spun Bismuth-Lead, bismuth-tin and bismuth-cadmium eutectic alloys have been investigated using X-ray analysis, the double bridge method and dynamic resonance method. The structure and physical properties of this alloy are affected by the preparation method (rapid solidification technique). X-ray diffraction analysis reveals that melt-spun ribbons with a thickness of 60-120 μm irradiated or unirradiated with the 6MV photon beam, are composed of Pb7Bi3 and Bi phases, and have a single orientation of growth. From the elastic moduli determinations, it is reported that a slight variations of values of Young"s modulus with the irradiation effects, because of a very slight disturbance in the structural inhomogeneity. The results show that the irradiated or unirradiated melt-spun ribbons of Bi50-Pb50, Bi45-Sn55 and Bi50- Cd50, have a slightly variations in value is observed, in elastic properties and in resistivity measurement.