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Articles by Nor Azowa Ibrahim
Total Records ( 6 ) for Nor Azowa Ibrahim
  Mansor Bin Ahmad , Kamyar Shameli , Majid Darroudi , Wan Md Zin Wan Yunus and Nor Azowa Ibrahim
  Problem statement: Silver Nanoparticles (Ag-NPs) have been synthesized by using chemical reduction method into the interlayer space of a Montmorillonite (MMT) as a solid support which is used to antibacterial application and polymer nanocomposites for fabrication of medical devices. Approach: AgNO3 and NaBH4 were used as a silver precursor and reducing agent, respectively. The properties of Ag/MMT nanocomposites were studied as a function of the AgNO3 concentration. The crystalline structure, d-spacing of interlayer of MMT, the size distributions and surface plasmon resonance of synthesized Ag-NPs were characterized using Powder X-Ray Diffraction (PXRD), Transmission Electron Microscopy (TEM) and UV-vis spectroscopy. Results: The results obtained from UV-vis spectroscopy of synthesized Ag-NPs showed that the intensity of the maximum wavelength of the plasmon peaks were increased with the increasing in the AgNO3 concentration. The obtained information from UV-vis spectra of Ag-NPs was in an excellent agreement with the obtained microstructures studies performed by Transmission Electron Microscopy (TEM) and their size distributions. The prepared Ag/MMT nanocomposites are very stable over a long period of time in aqueous solution. Conclusion: The synthesized Ag/MMT nanocomposites are very stable in aqueous solution over a long period of time without any sign of precipitation. Silver nanoparticles in MMT suspension could be suitable to use antibacterial applications, since MMT is viewed as ecologically and environmentally inert material and used for biological application such as cosmetics and pharmaceutical usage.
  Tan Foo Khoon , Jumiah Hassan , Nurhidayaty Mokhtar , Mansor Hashim , Nor Azowa Ibrahim , Wong Swee Yin , Leow Chun Yan and Wong Yick Jeng
  Problem statement: In the last decade, the studies and investigation on polymer-based composites have drawn significant attention owing to improvement in their mechanical, thermal, electrical, optical and pharmaceutical properties as compared with pure polymer. Approach: Different compositions of Ni0.2Zn0.8Fe2O4 (NZF) and Polypropylene (PP) can alter the useful properties of polymer-based composites. Hence, the determination toward significant percentage of NZF added into PP can improve the dielectric properties of the composites. NZF was prepared using conventional solid-state method and composites of isotactic PP filled with NZF were fabricated. The dielectric properties of the composite were investigated using Agilent 4284A Precision LCR meter. Results: The results indicated that with increasing ratio of wt% NZF, the dielectric constant and dielectric loss of the composite increases. The composition of 30 wt% NZF gave the highest value of the dielectric constant in the frequency range of 100 Hz-10 kHz at room temperature. Conclusion: The incorporation of ceramic filler improved the dielectric constant and increase the dielectric loss of the composite correspondingly increases its potential use as an absorbing material for electromagnetic waves.
  Soleha Mohamat Yusuff , Ong Keat Khim , Wan Mad Zin Wan Yunus , Jahwarhar Izuan Abdul Rashid , Anwar Fitrianto , Mansor Ahmad , Nor Azowa Ibrahim , Syed Mohd Shafiq Syed Ahmad and Chin Chuang Teoh
  Dewatered alum sludge from drinking water treatment plants was exploited as carbon dioxide (CO2) adsorbent in a fixed-bed (CO2)lumn system. In this study, the effects of 6 parameters including particle size of adsorbent, heat treatment of adsorbent, adsorbents dosage, adsorption temperature, flow rate of adsorbate and (CO2) ncentration on the fixed-bed adsorption of (CO2) were investigated using Response Surface Methodology 2 2 (RSM). The experimental data was successfully fitted with the regression model to identify the significant parameters and predict the optimum value parameters for maximizing (CO2) adsorption capacity. Analysis of 2 Variance (ANOVA) revealed that (CO2) ncentration was the most significant factor influenced the (CO2) adsorption capacity. The experimental data of (CO2) adsorption capacity were in a good agreement with the 2 predicted data from the regression model. The highest fixed-bed (CO2) adsorption capacity of 10.028 mmol.g 2 –1 (441.24 mg.g–1) was achieved using 1 g of 450-500 μm of 800°C thermally treated alum sludge at (CO2) ncentration of 8000 mg.L–1 with a flow rate of 90 mL.min–1 at 25°C. The results suggested that thermally treated alum sludge is a promising solid adsorbent for (CO2) capture.
  Mansor Bin Ahmad , Kamyar Shameli , Majid Darroudi , Wan Md Zin Wan Yunus , Nor Azowa Ibrahim , Azizah Abdul Hamid and Mohsen Zargar
  Silver nanoparticles (Ag-NPs) were successfully synthesized into the interlayer space of Montmorillonite (MMT) by chemical reduction method. AgNO3 and NaBH4 were used as a silver precursor and reducing agent, respectively. The properties of Ag/MMT nanocomposites were studied as a function of the AgNO3 concentration. The UV-vis spectra of synthesized Ag-NPs showed that the intensity of the maximum wavelength of the plasmon peaks increased with increasing AgNO3 concentration. The crystalline structure of the Ag-NPs and basal spacing of MMT and Ag/MMT were also studied by Powder X-Ray Diffraction (PXRD). The antibacterial activity of Ag-NPs was investigated against gram-negative bacteria (Escherichia coli, Escherichia coli O157:H7 and K. pneumonia) and gram-positive bacterium (Staphylococcus aureus) by disk diffusion method using Muller-Hinton Agar (MHA) at different sizes of Ag-NPs. The smaller Ag-NPs were found to have significantly higher antibacterial activity. These results showed that Ag-NPs can be used as effective growth inhibitors in different biological systems, making them applicable to medical applications such as in surgical devices.
  Mansor Bin Ahmad , Majid Darroudi , Kamyar Shameli , Abdul Halim Abdullah , Nor Azowa Ibrahim , Azizah Abdul Hamid and Mohsen Zargar
  Silver nanoparticles (Ag-NPs) were successfully synthesized into the interlayer space of Montmorillonite (MMT) by UV-irradiation method. AgNO3 and Montmorillonite (MMT) were used as a silver precursor and solid support, respectively. The properties of Ag/MMT nanocomposites were studied as a function of UV-irradiation time. UV-irradiation disintegrated the Ag NPs into smaller size until a relatively stable size and size distribution were achieved. The UV-vis spectra of synthesized Ag-NPs showed that the intensity of the maximum wavelength of the plasmon peaks increased with increasing UV-irradiation time. The synthesized Ag/MMT nanocomposites under longer UV irradiation time are very stable over a long time in aqueous solution without any sign of agglomeration or precipitants. The crystalline structure of the Ag-NPs and basal spacing of MMT and Ag/MMT were also studied by Powder X-Ray Diffraction (PXRD). The antibacterial activity of Ag-NPs was investigated against Gram-negative bacteria (Escherichia coli and Klebsiella pneumoniae) and Gram-positive bacteria (Staphylococcus aureus and Methicillin-Resistant Staphylococcus aureus (MRSA)) by disk diffusion method using Muller-Hinton Agar (MHA) at different sizes of Ag-NPs. All of synthesized Ag-NPs were found to have high antibacterial activity. These results showed that Ag-NPs can be useful in different biomedical research and applications such as diagnostic and surgical devices, contrast agents, drug delivery vehicles and physical therapy applications.
  Mansor Bin Ahmad , Kamyar Shameli , Majid Darroudi , Wan Md Zin Wan Yunus , Nor Azowa Ibrahim , Azizah Abdul Hamid and Mohsen Zargar
  A simple synthesis of silver/montmorillonite/chitosan (Ag/MMT/Cts) Bionanocomposites (BNCs) with controllable sizes is presented. In this research, reduction process of silver cations by UV-irradiation was performed. AgNO3, MMT and chitosan were used as a silver precursor, solid support and stabilizer, respectively. The properties of Ag/MMT/Cts BNCs were studied as a function of UV-irradiation time. We found that UV-irradiation disintegrated the silver nanoparticles (Ag-NPs) into smaller size until a relatively stable size and size distribution were achieved. The average size, size distribution and crystalline structure of Ag-NPs were determined by Transmission Electron Microscopy (TEM) and Powder X-Ray Diffraction (PXRD). The antibacterial activity of Ag-NPs was investigated against Gram-negative bacterium (Escherichia coli (E. coli)) and Gram-positive bacteria (Staphylococcus aureus (S. aureus) and Methicillin-Resistant Staphylococcus Aureus (MRSA)) by disk diffusion method using Muller-Hinton Agar (MHA) at different sizes of Ag-NPs. All of synthesized Ag/MMT/Cts BNCs were found to have high antibacterial activity. These results showed that Ag/MMT/Cts BNCs can be useful in different biological research and biomedical applications such as surgical devices and drug delivery vehicles.
 
 
 
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