Khairel Rafezi Ahmad, Associate Prof Dr.http://dspace.unimap.edu.my:80/xmlui/handle/123456789/337262024-03-29T14:36:17Z2024-03-29T14:36:17ZAluminium - Polymer abs productMohd Ichwan, NasutionKamaruddin, HussinShamsul Baharin, JamaludinChe Mohd Ruzaidi, GhazaliKhairel Rafezi, AhmadFaizul, Che PaChek Idrus, Omarhttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/504942020-07-02T07:55:30Z2012-01-01T00:00:00ZAluminium - Polymer abs product
Mohd Ichwan, Nasution; Kamaruddin, Hussin; Shamsul Baharin, Jamaludin; Che Mohd Ruzaidi, Ghazali; Khairel Rafezi, Ahmad; Faizul, Che Pa; Chek Idrus, Omar
Material used for aluminium product usually made of aluminium scrap. Currently, the price of aluminium scrap is increase. It is necessary to minimize the cost of production by reducing the weight of the aluminium product at the same time remain the form or the shape of the product. Fabrication of aluminium matrix composite is one of the method to reduce the weight of aluminium but the modulus improved due the addition of ceramic materials as reinforcement. Acrylonitrine Butadiene Styrene (ABS) was selected because of its low density and low melting temperature. The results indicated that homogenous microstructure and better strengh can be obtained.
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2012-01-01T00:00:00ZPreparation of colossal magnetoresistance ploycrystalline via sol-gel technique: a short reviewMohd Zaki, RuhiyuddinAbdullah, Chik, Assoc. Prof. Dr.Khairel Rafezi, Ahmad, Dr.http://dspace.unimap.edu.my:80/xmlui/handle/123456789/355852014-06-17T04:51:30Z2013-01-01T00:00:00ZPreparation of colossal magnetoresistance ploycrystalline via sol-gel technique: a short review
Mohd Zaki, Ruhiyuddin; Abdullah, Chik, Assoc. Prof. Dr.; Khairel Rafezi, Ahmad, Dr.
This paper presents a short review of research work on the development of synthesizing the colossal magnetoresistance materials through sol-gel method. Although there are a lot number of methods available, sol-gel method has been widely used and some excellent work has been reported. Two different manganite systems, which are LSMO and PSMO, that have been prepared through sol-gel method was choose for the discussion purpose. It was found that both systems were successfully prepared via the sol-gel method. Both systems showing better magnetoresistance properties compare to sample prepared through solid state reaction. X-ray diffraction technique was used to study the structural characteristic. Atomic force microscope and field emission scanning electron microscope were used in order to investigate surface morphology. Resistivity as a function of temperature was measured by a standard four-probe method.
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2013-01-01T00:00:00ZEffect of temperature of oxalic acid on the fabrication of Porous anodic alumina from Al-Mn alloysMohd Nazree, Derman, Dr.Foo, Kai LoongKhairel Rafezi, Ahmad, Dr.Uda, Hashim, Prof. Dr.Voon, Chun Honghttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/351932014-06-09T02:15:54Z2013-01-01T00:00:00ZEffect of temperature of oxalic acid on the fabrication of Porous anodic alumina from Al-Mn alloys
Mohd Nazree, Derman, Dr.; Foo, Kai Loong; Khairel Rafezi, Ahmad, Dr.; Uda, Hashim, Prof. Dr.; Voon, Chun Hong
The influence of temperature of oxalic acid on the formation of well-ordered porous anodic alumina on Al-0.5 wt% Mn alloys was studied. Porous anodic alumina has been produced on Al-0.5 wt% Mn substrate by single-step anodising at 50 V in 0.5 M oxalic acid at temperature ranged from 5°C to 25°C for 60 minutes. The steady-state current density increased accordingly with the temperature of oxalic acid. Hexagonal pore arrangement was formed on porous anodic alumina that was formed in oxalic acid of 5, 10 and 15°C while disordered porous anodic alumina was formed in oxalic acid of 20 and 25°C. The temperature of oxalic acid did not affect the pore diameter and interpore distance of porous anodic alumina. Both rate of increase of thickness and oxide mass increased steadily with increasing temperature of oxalic acid, but the current efficiency decreased as the temperature of oxalic acid increased due to enhanced oxide dissolution from pore wall.
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2013-01-01T00:00:00ZRoom temperature anodization of aluminum and the effect of the electrochemical cell in the formation of porous alumina films from acid and alkaline electrolytesAlaba Oladeji, AraoyinboAzmi, Rahmat, Assoc. Prof. Dr.Mohd Nazree, Derman, Dr.Khairel Rafezi, Ahmad, Drhttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/351012014-06-05T03:09:08Z2012-01-01T00:00:00ZRoom temperature anodization of aluminum and the effect of the electrochemical cell in the formation of porous alumina films from acid and alkaline electrolytes
Alaba Oladeji, Araoyinbo; Azmi, Rahmat, Assoc. Prof. Dr.; Mohd Nazree, Derman, Dr.; Khairel Rafezi, Ahmad, Dr
Nanoporous alumina was produced by anodic oxidation of aluminum in both acidic and alkaline electrolytes. Previous reports indicate that nanoporous aluminais mainly produced from strongly acidic electrolytes, and with the use of a low freezing temperature controlled bath to control the propagation and growth of the pores. We design an in-house electrochemical cell with an electronic circuit box attached, to control the anodization of aluminum at room temperature. The electrolytes used were phosphoric acid solution and sodium hydroxide solution. The pH of the acidic electrolyte was adjusted to 1, 3 and 5 with an applied potential of 50V and anodization time of 1 and 3 hrs, respectively, while the alkaline electrolyte pH was adjusted to 9, 11 and 13 with an applied potential of 40V and the templates anodized for 5 hrs. The micrographs of the nanoporous alumina formed from these electrolytes confirm that the nucleation and growth of nanoporous alumina films is achievable with the aid of the electronic circuit box connected to the electrochemical cell.
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2012-01-01T00:00:00Z