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Mixed Ligand Complexes of Co(II) and Ni(II) Containing Organic Acids and Amine Bases as Primary and Secondary Ligands
Md. Sher Ali,
Md. Kudrat-E-Zahan,
Md. Masuqul Haque,
Md. Abdul Alim,
Md. Mofasserul Alam,
Jesmin Ara Shompa,
M. S. Islam
Issue:
Volume 4, Issue 4, July 2015
Pages:
225-228
Received:
10 May 2015
Accepted:
20 May 2015
Published:
3 June 2015
Abstract: The synthesis and characterization of mixed ligand complexes of Co(II) and Ni(II) have been described. Organic dibasic acid, malic acid plays role as primary ligand and Heterocyclic amine bases play role as secondary ligands in the complexes. Melting points, Elemental analysis, Magnetic susceptibility measurements, IR, UV and 1H-NMR spectral analysis were used in determining their physico-chemical properties. The prepared complexes of Co(II) and Ni(II) were found to form octahedral structure.
Abstract: The synthesis and characterization of mixed ligand complexes of Co(II) and Ni(II) have been described. Organic dibasic acid, malic acid plays role as primary ligand and Heterocyclic amine bases play role as secondary ligands in the complexes. Melting points, Elemental analysis, Magnetic susceptibility measurements, IR, UV and 1H-NMR spectral analys...
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Effect of Microwave and Conventional Heating on the Cure Cycles of Particulate Reinforced Polymer Matrix Composites
Adefemi O. Adeodu,
Christopher O. Anyaeche,
Oluleke O. Oluwole,
Charles U. Omohimoria
Issue:
Volume 4, Issue 4, July 2015
Pages:
229-240
Received:
21 May 2015
Accepted:
26 May 2015
Published:
16 June 2015
Abstract: Polymer composites by and large found suitable for many specific applications in the field of electrical, electronics, marine, aerospace and microelectronics. Thus a new technique for processing polymer composites has been explored and one such is microwave curing. The roles of microwave in the post curing of polymer matrix composites cannot be under estimated, as it has the capacity to reduce the undue lengthy cure cycle and also improve the mechanical properties of the composite produced. The aim of the study is to determine the effect of microwave post curing on the cure cycles of the unsaturated polyester composites reinforced with aluminum and carbon black. This effect was compared with that post cured using conventional oven with the objective of investigating the significance of microwave curing on the curing time of the produced composites. A specific study comprising of aluminum filled polyester based composite and carbon black filled polyester based composite were investigated using two different composite curing methods (microwave and conventional autoclave heating). The investigation, through experimentation was based on temperature profile in term of heating rate and cure characteristics in term of degree of cure of the produced composites. Comparing the results of the post-curing of the composites using microwave and conventional methods, 30% aluminum filled cured at 940C, 20% aluminum filled cure 920C, while 10% aluminum filled cured at 840C. Also, it took 20 minutes and 15 minutes for aluminium filled polyester and carbon black filled polyester composites respectively to reach ultimate cure in microwave system as compared to conventional autoclave system that takes the composite samples 290 minutes and 170 minutes respectively to get to the ultimate cure. It was concluded that post-curing of the particulate composites through microwave is able to achieve good heating rate and better control of temperature as compared to the conventional autoclave curing.
Abstract: Polymer composites by and large found suitable for many specific applications in the field of electrical, electronics, marine, aerospace and microelectronics. Thus a new technique for processing polymer composites has been explored and one such is microwave curing. The roles of microwave in the post curing of polymer matrix composites cannot be und...
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Magneto-Rheological Dynamometer Dynamic Model Research
Issue:
Volume 4, Issue 4, July 2015
Pages:
241-245
Received:
26 May 2015
Accepted:
9 June 2015
Published:
25 June 2015
Abstract: This article simply introduces a new material magneto-rheological fluid (MRF) and its widely used, and developed a new type of magneto-rheological dynamometer based on the rheological properties of MRF. This dynamometer introduces magneto-rheological fluid as the working medium, and using the shear yield stress of magneto-rheological fluid in a magnetic field to transmit torque. The paper explored the working mechanism of MR dynamometer, established the torque transmission model of MR dynamometer, and analyzed the flow properties of MRF in the dynamometer under steady-state based on Bingham model and fluid momentum equation.
Abstract: This article simply introduces a new material magneto-rheological fluid (MRF) and its widely used, and developed a new type of magneto-rheological dynamometer based on the rheological properties of MRF. This dynamometer introduces magneto-rheological fluid as the working medium, and using the shear yield stress of magneto-rheological fluid in a mag...
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Simulated Sunlight Induced the Degradation of Rhodamine B Over Graphene Oxide-Based Ag3PO4@AgCl
Mahgoub Ibrahim Shinger,
Ahmed Mahmoud Idris,
Dong Dong Qin,
Hind Baballa,
Duoliang Shan,
Xiaoquan Lu
Issue:
Volume 4, Issue 4, July 2015
Pages:
246-255
Received:
21 May 2015
Accepted:
6 June 2015
Published:
30 June 2015
Abstract: A facile, environmentally friendly and economical in-situ ion-exchange method was successfully fabricated graphene oxide-based Ag3PO4@AgCl photocatalyst to promote the photocatalytic activity of Ag3PO4@AgCl. The as synthesized GO-Ag3PO4@AgCl composite was characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy and photoluminescence (PL). The morphology and the structure of the synthesized photocatalyst were characterized by field-emission scanning electron microscopy (SEM) and transmitter electron microscopy (TEM). The elements detection and the chemical state of the sample were investigated by X-ray photoelectron spectroscopy (XPS) analysis. GO-Ag3PO4@AgCl exhibited higher photocatalytic activity over Ag3PO4@AgCl and Ag3PO4 for the degradation of Rhodamine B (RhB) under simulated sunlight, and the highest photocatalytic activity was obtained by GO-Ag3PO4@AgCl photocatalyst with Cl/P ratio of 0.5. The quenching study using different scavengers investigated that the photogenerated holes (h+) and superoxide radicals (•O2-) played a key role in the degradation of RhB. The kinetic study revealed that the degradation of RhB over GO-Ag3PO4@AgCl-0.5 under simulated sunlight followed the first-order kinetics.
Abstract: A facile, environmentally friendly and economical in-situ ion-exchange method was successfully fabricated graphene oxide-based Ag3PO4@AgCl photocatalyst to promote the photocatalytic activity of Ag3PO4@AgCl. The as synthesized GO-Ag3PO4@AgCl composite was characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), UV-vis diffuse re...
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Detection of Impact Location by Using Anisotropy of Output Voltage of Metal-Core Piezoelectric Fiber/Aluminum Composites
Tetsuro Yanaseko,
Hiroshi Asanuma,
Hiroshi Sato
Issue:
Volume 4, Issue 4, July 2015
Pages:
256-260
Received:
10 June 2015
Accepted:
19 June 2015
Published:
4 July 2015
Abstract: This paper describes the detection of an impact location by using anisotropy of the output voltage of a metal-core piezoelectric ceramic fiber/aluminum composite. Metal-core piezoelectric ceramic fibers are very fragile. The mechanical properties of metal-core piezoelectric ceramic fibers can be improved by embedding the fibers into the metals that have excellent reliability and strength. Therefore, metal-core piezoelectric ceramic fiber/aluminum composites were developed by using the Interphase Forming/Bonding method. Furthermore, the output voltage characteristics of fabricated a composite were evaluated, and the anisotropy of the output voltage was observed. In this study, the impact location detection system was developed by using the anisotropy of the output voltage of the composite. It is expected to reduce the number of sensors compared with conventional systems while maintaining the accuracy. As a result, the impact location detection was successfully developed by using the model of the output voltage of the composites that were disposed in two different positions to obtain the signals.
Abstract: This paper describes the detection of an impact location by using anisotropy of the output voltage of a metal-core piezoelectric ceramic fiber/aluminum composite. Metal-core piezoelectric ceramic fibers are very fragile. The mechanical properties of metal-core piezoelectric ceramic fibers can be improved by embedding the fibers into the metals that...
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Electrical and Mechanical Properties of Microwave Sintered Cu-ZrO2 (8-YSZ) Nano-Composites
Mahmood Khaloobagheri,
Marjan Darabi,
Shima Abdollahi Barfjan
Issue:
Volume 4, Issue 4, July 2015
Pages:
261-265
Received:
14 June 2015
Accepted:
26 June 2015
Published:
8 July 2015
Abstract: Metal matrix nano-composites containing copper and ZrO2 (8-YSZ) were sintered by microwave using mixtures of Cu and 1 wt.%, 2 wt.%, 3 wt.%, 4 wt.% and 5 wt.% of zirconia powders for 20min. The zirconia content up to 5 wt.%, resulted in an increase of 62.5% and 21.9% in micro-hardness and compressive strength respectively, and slight decrease in relative density and electrical conductivity (% IACS). In addition, field emission scanning electron micros copy (FESEM) and SEM fitted with EDX were used to characterize the sintered nano-composites.
Abstract: Metal matrix nano-composites containing copper and ZrO2 (8-YSZ) were sintered by microwave using mixtures of Cu and 1 wt.%, 2 wt.%, 3 wt.%, 4 wt.% and 5 wt.% of zirconia powders for 20min. The zirconia content up to 5 wt.%, resulted in an increase of 62.5% and 21.9% in micro-hardness and compressive strength respectively, and slight decrease in rel...
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An Investigation into the Thermal Properties of Termite Mound Clay Applicable to Grain Silo Construction
Omobowale Mobolaji Oluyimika,
Mijinyawa Yahaya,
Faruk S.
Issue:
Volume 4, Issue 4, July 2015
Pages:
266-271
Received:
18 June 2015
Accepted:
6 July 2015
Published:
15 July 2015
Abstract: Provision of suitable grain silos in humid tropical climates has generated research interests on the possibility of using local materials for construction. Termite mound clay (TMC), a material available in abundance was investigated as a potential construction material. A major factor determining the suitability of construction materials for grain silos is its thermal properties. Therefore, thermal conductivity, specific heat capacity, thermal diffusivity and thermal mass of TMC were determined and compared with those of concrete and stainless steel which are commonly used for silo construction. TMC was collected, crushed and sieved using a 500μm sieve to remove coarse particles and foreign materials. The TMC powder obtained was mixed with water using volumetric ratio of 1:5 (i.e. water to clay) after which the thoroughly mixed clay was carefully fed into the mould and left to air-dry for 5 days. The samples were dried in the oven at 105oC for about 48 hours to remove all the moisture. Results revealed that thermal conductivity ranged from 0.17 to 0.24 W/(m•K) with an average value of 0.21 compared to concrete and steel which range between 0.8 – 1.28 and 16.3 – 16.7 W/(m•K) respectively. Specific heat capacity had an average value of 2576.94 J/(kg•K) compared with concrete and steel which had values of 960 and 490 J/(kg•K) respectively. Thermal diffusivity had a mean value of 1.47×10-8 m2/s in comparison to concrete and steel whose calculated values were 6.63 ×10-7 and 4.18 ×10-6 kJ/(m3•K) respectively while thermal mass had a mean value of 4723.5 kJ/(m3•K) compared to 2112.0 and 3831.8 kJ/(m3•K) for concrete and steel respectively. It was concluded that TMC offers a thermally suitable alternative to these two for grain silo construction in the humid tropics.
Abstract: Provision of suitable grain silos in humid tropical climates has generated research interests on the possibility of using local materials for construction. Termite mound clay (TMC), a material available in abundance was investigated as a potential construction material. A major factor determining the suitability of construction materials for grain ...
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Numerical Simulation of Thermo Mechanical Fatigue Phenomenom and Damage Evolution Bihaviour 5182 H111 Aluminium Alloy
Abdelouahid El Amri,
Mounir El Yakhloufi haddou,
Issam hanafi,
Francisco Mata Cabrera
Issue:
Volume 4, Issue 4, July 2015
Pages:
272-276
Received:
27 June 2015
Accepted:
9 July 2015
Published:
18 July 2015
Abstract: The paper present results of a numerical modelling of ductile fracture and failure of elements made of 5182H111 aluminum alloy subjected to dynamic traction. The analysis was performed using Johnson-Cook model based ABAQUS software. The infrared thermography was used to quantify deformation localization zones, also to relate the temperature changes of the specimen, continuously recorded by thermography, with the load extension diagram. The aim of the research was to specify and test the mechanical properties during numerical simulation. The experimental test results for the mechanical properties of the studies are presented with a large description of the testing facilities. The test results were used to determine the temperature dependencies of the mechanical properties, yield strength, modulus of elasticity and thermal elongation
Abstract: The paper present results of a numerical modelling of ductile fracture and failure of elements made of 5182H111 aluminum alloy subjected to dynamic traction. The analysis was performed using Johnson-Cook model based ABAQUS software. The infrared thermography was used to quantify deformation localization zones, also to relate the temperature changes...
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Mechanical Characterization of PU Based Sandwich Composites with Variation in Core Density
Sunith Babu L.,
H. K. Shivanand
Issue:
Volume 4, Issue 4, July 2015
Pages:
277-282
Received:
16 June 2015
Accepted:
7 July 2015
Published:
18 July 2015
Abstract: Sandwich composite finds its application in varied fields of engineering, mainly due to the fact that they are light weight, have a better strength to weight ratio and to an extent corrosion resistant. Each application might involve different fabrication technique and selection of appropriate foam core and facings. In this study, three different core densities of PU foam combined with glass fiber facings are fabricated using vacuum bagging technique. Because of their complex nature of fabrication by adding epoxy resin between facings and core makes the evaluation of their mechanical characteristics quite difficult to predict. Since core material being the weakest part of the sandwich composite, studies are carried out to determine the effect of change in mechanical properties by increasing the core thickness and density. Further, the mechanical response of these sandwich composites are studied by carrying out flatwise, edgewise compressive test and flexural strength on a Mecmesin MultiTest 10 –i testing equipment as per ASTM standards. It is found that with increase in core density the flatwise compressive modulus increases and facesheet wrinkling in low density foam and core debonding in higher density foam was noticed in edgewise compression. The flexural tests showed that with increase in core thickness marginally increased the face being stress as compared with increase in core density.
Abstract: Sandwich composite finds its application in varied fields of engineering, mainly due to the fact that they are light weight, have a better strength to weight ratio and to an extent corrosion resistant. Each application might involve different fabrication technique and selection of appropriate foam core and facings. In this study, three different co...
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