Zaidan Wahab - Academia.edu (original) (raw)
Papers by Zaidan Wahab
Nondestructive Testing and Evaluation, 2008
This paper examines the application of a square pulse approximation to the camera flash temporal ... more This paper examines the application of a square pulse approximation to the camera flash temporal profile as a heating source in the photoflash technique. The technique was used in measuring SiC/B4C composites whereby thin-film polyvinylidene difluoride film was the detector. The analytical model derived for the square pulsed heating source was tested against the data obtained from SiC/B4C composites of
International Journal of Molecular Sciences, 2012
The rapid and green formation of spherical and dendritic silver nanostructures based on microwave... more The rapid and green formation of spherical and dendritic silver nanostructures based on microwave irradiation time was investigated. Silver nanoparticles were successfully fabricated by reduction of Ag + in a water medium and using polyvinylpyrrolidone (PVP) as the stabilizing agent and without the use of any other reducing agent, and were compared with those synthesized by conventional heating method. UV-vis absorption spectrometry, transmission electron microscopy (TEM), atomic absorption spectroscopy (AAS) and photon correlation spectroscopy (PCS) measurements, indicated that increasing the irradiation time enhanced the concentration of silver nanoparticles and slightly increased the particle size. There was a lack of large silver nanoparticles at a high concentration, but interestingly, the formation and growth of silver dendrite nanostructures appeared. Compared to conventional heating methods, the silver nanoparticle suspension produced by irradiated microwaves was more stable over a six-month period in aqueous solution without any signs of precipitation.
Systematic series of (B2O3,P2O5)-Bi2O3-PbO glasses have been successfully prepared by using the r... more Systematic series of (B2O3,P2O5)-Bi2O3-PbO glasses have been successfully prepared by using the rapid quenching technique in which each oxide content changes for every series on the basis of its weight percentage. Their amorphous natures were confirmed earlier by the x-ray diffraction technique. The experimental results show that the density of both glasses, determined by using the Archimedes principle, increases with
... An addition of Bi2O3, classified as alkaline metal oxides into the system, the bond ... Effec... more ... An addition of Bi2O3, classified as alkaline metal oxides into the system, the bond ... Effect of melt ageing on the density, elastic modulus and glass transition temperature of ... Influence of BaTiO3 on semiconducting V2O5-Bi2O3-TeO2 oxide glasses through ultrasonic studies. ...
Journal of Physics: Conference Series, 2010
... Rev Sci Instrum 74, 700 (2003). [6] Jun Shen and A. Mandelis. Rev Sci Instrum 66, 4999 (1995)... more ... Rev Sci Instrum 74, 700 (2003). [6] Jun Shen and A. Mandelis. Rev Sci Instrum 66, 4999 (1995). [7] BZ Azmi, M. Noroozi, Zahid Rizwan, ZA Sulaiman, ZA Wahab, and MM Moksin. Infrared Phys Technol 51(3), 270-275 (2008). [8] CA Bennett and RR Patty. ...
Journal of Non-Crystalline Solids, 2013
Fabrication of a series of binary (PbO) x (P 2 O 5 ) 1−x lead phosphate glasses with various mole... more Fabrication of a series of binary (PbO) x (P 2 O 5 ) 1−x lead phosphate glasses with various mole fractions (x = 0.1 to 0.6) was carried out using a conventional melt-quenching method. The glass density was measured by using Archimedes principle. The ultrasonic wave velocities (V l and V t ) of the glasses were determined at room temperature by using a nondestructive test: the digital signal processing technique of the Ultrasonic Data Acquisition System (Matec 8020, Matec Instruments, USA). The experimental data for the wave velocities and densities were then used to determine the elastic properties in each series of lead phosphate glass systems: the longitudinal, shear, bulk and Young's moduli; Poisson's ratio; and the Debye temperature. Based on the results obtained, the longitudinal, shear, bulk and Young's moduli of the glasses increased with the addition of PbO content. The Poisson's ratio obtained remains almost constant, while the Debye temperature shows a continuous decrease with the addition of PbO content.
International Journal of Thermophysics, 2013
ABSTRACT
Infrared Physics & Technology, 2008
... BZ Azmi Corresponding Author Contact Information , a , E-mail The Corresponding Author , M. N... more ... BZ Azmi Corresponding Author Contact Information , a , E-mail The Corresponding Author , M. Noroozi a , Zahid Rizwan a , ZA Sulaiman a , ZA Wahab a ... The metalized optical fiber tip was used to generate thermal wave instead of metal foil attached to a tube as in the case of ...
The structural, magnetic and electrical properties of lanthanum manganites have been reported. La... more The structural, magnetic and electrical properties of lanthanum manganites have been reported. La0. 67Ca0. 33MnO3 sample synthesized via co-precipitation (COP) method with starting materials derived from metal acetates were compared to the specimens prepared by solid state route (SSR). The Curie temperature, TC and the metal-insulator transition temperature, TP were obtained by ac susceptibility and four-point probe techniques. The results showed that TC and TP were 260 K and 276 K respectively for the ...
Ionics, 2007
NiFe 2 O 4 prepared via the sol-gel technique were pre-sintered at 900°C and synthesized at diffe... more NiFe 2 O 4 prepared via the sol-gel technique were pre-sintered at 900°C and synthesized at different sintering temperatures from 1,000°C to 1,200°C at 100°C intervals. The samples were characterized for microwave dielectric properties. These samples were measured using Agilent Impedance/Material Analyzer at frequencies 1 MHz to 1.8 GHz. Results showed a decrease in the dielectric constant and loss factor with frequency except at the turning point, around 150 MHz, where the loss factor showed a gradual increase. However, both the dielectric constant and loss factor increase with increasing sintering temperature. The grain size and density also increased with increasing sintering temperature, but the porosity and grain boundary density showed a decrease.
Nondestructive Testing and Evaluation, 2008
This paper examines the application of a square pulse approximation to the camera flash temporal ... more This paper examines the application of a square pulse approximation to the camera flash temporal profile as a heating source in the photoflash technique. The technique was used in measuring SiC/B4C composites whereby thin-film polyvinylidene difluoride film was the detector. The analytical model derived for the square pulsed heating source was tested against the data obtained from SiC/B4C composites of
International Journal of Molecular Sciences, 2012
The rapid and green formation of spherical and dendritic silver nanostructures based on microwave... more The rapid and green formation of spherical and dendritic silver nanostructures based on microwave irradiation time was investigated. Silver nanoparticles were successfully fabricated by reduction of Ag + in a water medium and using polyvinylpyrrolidone (PVP) as the stabilizing agent and without the use of any other reducing agent, and were compared with those synthesized by conventional heating method. UV-vis absorption spectrometry, transmission electron microscopy (TEM), atomic absorption spectroscopy (AAS) and photon correlation spectroscopy (PCS) measurements, indicated that increasing the irradiation time enhanced the concentration of silver nanoparticles and slightly increased the particle size. There was a lack of large silver nanoparticles at a high concentration, but interestingly, the formation and growth of silver dendrite nanostructures appeared. Compared to conventional heating methods, the silver nanoparticle suspension produced by irradiated microwaves was more stable over a six-month period in aqueous solution without any signs of precipitation.
Systematic series of (B2O3,P2O5)-Bi2O3-PbO glasses have been successfully prepared by using the r... more Systematic series of (B2O3,P2O5)-Bi2O3-PbO glasses have been successfully prepared by using the rapid quenching technique in which each oxide content changes for every series on the basis of its weight percentage. Their amorphous natures were confirmed earlier by the x-ray diffraction technique. The experimental results show that the density of both glasses, determined by using the Archimedes principle, increases with
... An addition of Bi2O3, classified as alkaline metal oxides into the system, the bond ... Effec... more ... An addition of Bi2O3, classified as alkaline metal oxides into the system, the bond ... Effect of melt ageing on the density, elastic modulus and glass transition temperature of ... Influence of BaTiO3 on semiconducting V2O5-Bi2O3-TeO2 oxide glasses through ultrasonic studies. ...
Journal of Physics: Conference Series, 2010
... Rev Sci Instrum 74, 700 (2003). [6] Jun Shen and A. Mandelis. Rev Sci Instrum 66, 4999 (1995)... more ... Rev Sci Instrum 74, 700 (2003). [6] Jun Shen and A. Mandelis. Rev Sci Instrum 66, 4999 (1995). [7] BZ Azmi, M. Noroozi, Zahid Rizwan, ZA Sulaiman, ZA Wahab, and MM Moksin. Infrared Phys Technol 51(3), 270-275 (2008). [8] CA Bennett and RR Patty. ...
Journal of Non-Crystalline Solids, 2013
Fabrication of a series of binary (PbO) x (P 2 O 5 ) 1−x lead phosphate glasses with various mole... more Fabrication of a series of binary (PbO) x (P 2 O 5 ) 1−x lead phosphate glasses with various mole fractions (x = 0.1 to 0.6) was carried out using a conventional melt-quenching method. The glass density was measured by using Archimedes principle. The ultrasonic wave velocities (V l and V t ) of the glasses were determined at room temperature by using a nondestructive test: the digital signal processing technique of the Ultrasonic Data Acquisition System (Matec 8020, Matec Instruments, USA). The experimental data for the wave velocities and densities were then used to determine the elastic properties in each series of lead phosphate glass systems: the longitudinal, shear, bulk and Young's moduli; Poisson's ratio; and the Debye temperature. Based on the results obtained, the longitudinal, shear, bulk and Young's moduli of the glasses increased with the addition of PbO content. The Poisson's ratio obtained remains almost constant, while the Debye temperature shows a continuous decrease with the addition of PbO content.
International Journal of Thermophysics, 2013
ABSTRACT
Infrared Physics & Technology, 2008
... BZ Azmi Corresponding Author Contact Information , a , E-mail The Corresponding Author , M. N... more ... BZ Azmi Corresponding Author Contact Information , a , E-mail The Corresponding Author , M. Noroozi a , Zahid Rizwan a , ZA Sulaiman a , ZA Wahab a ... The metalized optical fiber tip was used to generate thermal wave instead of metal foil attached to a tube as in the case of ...
The structural, magnetic and electrical properties of lanthanum manganites have been reported. La... more The structural, magnetic and electrical properties of lanthanum manganites have been reported. La0. 67Ca0. 33MnO3 sample synthesized via co-precipitation (COP) method with starting materials derived from metal acetates were compared to the specimens prepared by solid state route (SSR). The Curie temperature, TC and the metal-insulator transition temperature, TP were obtained by ac susceptibility and four-point probe techniques. The results showed that TC and TP were 260 K and 276 K respectively for the ...
Ionics, 2007
NiFe 2 O 4 prepared via the sol-gel technique were pre-sintered at 900°C and synthesized at diffe... more NiFe 2 O 4 prepared via the sol-gel technique were pre-sintered at 900°C and synthesized at different sintering temperatures from 1,000°C to 1,200°C at 100°C intervals. The samples were characterized for microwave dielectric properties. These samples were measured using Agilent Impedance/Material Analyzer at frequencies 1 MHz to 1.8 GHz. Results showed a decrease in the dielectric constant and loss factor with frequency except at the turning point, around 150 MHz, where the loss factor showed a gradual increase. However, both the dielectric constant and loss factor increase with increasing sintering temperature. The grain size and density also increased with increasing sintering temperature, but the porosity and grain boundary density showed a decrease.