141 research outputs found
Synthesis and physicochemical analysis of Polystyrene-Anchored Pd(II) metal complex / Siti Kamilah Che Soh, Siti Aminah Jusoh and Mustaffa Shamsuddin
No full textA polystyrene (PS)-anchored Pd(II) metal complex was synthesized on cross-linked polymer by heating a mixture of chlorometylated polystyrene with phenyldithiocarbazate and carbon disulfide in the presence of potassium hydroxide (KOH) in dimethylformamide (DMF). The reaction mixture was heated at 80 °C to form the corresponding phenyldithiocarbazate-functionalized polymer. Then, it was treated with bis(benzonitrile)palladium(II) chloride. The
properties of dark colored polymer, impregnated with the metal complex was then characterized by various spectroscopic technique such as Fourier Transform Infrared (FTIR), Scanning Electron Microscopy/Energy Dispersive X-ray (SEM/EDX), CHNS elemental analysis, BET surface area, X-ray Diffraction (XRD), Thermogravimetric (TGA) and Inductively Coupled Plasma-Optical Emission (ICP-OES) spectroscopy
Biosynthesis of gold nanoparticles using psidium guajava leaf extract
No full textNanomaterials are attracting a lot of attention nowadays as they show different chemical and physical properties that are dependent on their size and shape. Different techniques have been used for synthesis metal nanoparticles but the use of plants for synthesis of nanoparticles could be advantageous over other environmentally methods as this eliminates the cost and the non toxicity is main feature. Here a simple biosynthesis approach was applied and gold nanoparticles were synthesized by using psidium guajava leaf extract as reducing and capping agent. Two different parameters were studied which are the metal ion concentration and volume of plant broth. The synthesis of gold nanoparticles was also monitored as function of reaction time. The formation of gold nanoparticles was monitored by UV-Vis spectrophotometer and the size of particles was confirmed by X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM) techniques. TEM analysis showed that the AuNPs were mostly spherical in shape with an average size of 15 nm. Fourier Transform Infrared (FTIR) spectroscopy that the active biomolecules present in the Psidium guajava leaf extract act as capping and stabilizing agent for the AuNPs
N,N' - bis - salicylidene - 2, 2 - dimethylpropane -1, 3 - diamine palladium (II) ethanol solvate
No full textMUP Training / Mohd Zahlan Mustaffa ... [et al.]
No full textMUP's Training is a centre for student to enhance their talent and motivations. This company main business is offering motivation courses for students. They are stated in Alor Setar , Kedah. They started their first operation in January 200
A comparative study on energy saving building vs conventional building / Maznifaeza Md Mustaffa
No full textEnergy saving application in buildings is one of the actions that can be taken as the preparation for the future, when energy becomes crucial. Over past few years as buildings are energy intensive in their construction and operation, many efforts have been put by government and non government organisations (NGO) to make the construction industry become more aware of the impacts of the building on the global environment, particularly through its use of energy. Energy saving buildings is the buildings that use energy, water and other natural resources efficiently and provide safe and productive indoor environment. The efficient use of energy or energy efficiency on energy saving building will help to reduce energy consumption, hence"will cause less emission. It then provides the specified internal environment for minimum energy cost, normally within the constraint of what is achievable cost effectively. This dissertation is to study the energy efficiency in energy saving building with comparison to the conventional building and only focuses on design and cost effectiveness on electrical consumption. To support this research, four (4) buildings namely the The Ministry of Energy, Water and Communications (MEWC) building, Mesiniaga Tower, Wisma UEP, Majlis Perbandaran Subang Jaya (MPSJ) building and has been taken as case studies. From this study, the author hopes that it would give clear perception to the reader on advantages to build energy saving building. The cost yardstick from this study also can be use to develop the new energy saving building in the future
Preparation and aggregation-induced emission of new 1,3,5-triazine-2,4,6-tricarboxamide with liquid crystal properties
No full textThe combination of aggregation-induced emission (AIE) and liquid crystal properties generates solid-state efficient luminescent liquid crystal materials.Here in, we reported the synthesis of 1,3,5-triazine-2,4,6-tricarboxamide and utilized it as a supramolecular organic motif for the AIE-active liquid crystal material.The compound exhibits high-intensity emission maxima at 417 and 468 nm in the solid state with excitation at 254 nm, whereas it shows weak emission in the solution phase. Also, this compound behaves as liquid crystalline material and shows columnar hexagonal mesophase with endothermic peaks at 73.4oC, 185.6oC, and exothermic peaks were observed at 181.9oC and 66.1oC with focal conic fan shape texture.The thermal data showed that the compound is stable up to 200oC
Photocatalytic hydrogen production under visible light over Cd0.1SnxZn0.9-2xS solid solution photocatalysts
No full textA series of Cd0.1SnxZn0.9-2xS solid solution was successfully synthesized by hydrothermal method and employed as photocatalyst for photocatalytic hydrogen evolution under visible light irradiation. The structures, optical properties and morphologies of the solid solutions were studied by X-ray diffraction, diffuse reflectance UV–visible spectroscopy and field emission scanning electron microscopy. From the characterizations, it was confirmed that Sn can form solid solution with Cd0.1Zn0.9S and the high crystallinity can be maintained as well. Among all samples, the highest photocatalytic activity was observed on Cd0.1Sn0.01Zn0.88S photocatalyst, with average rate of hydrogen production 3.52 mmol/h, which was ca. 1.5 times higher than the Cd0.1Zn0.9S photocatalyst. In addition to the high activity, the Cd0.1Sn0.01Zn0.88S also showed high stability at long irradiation time. The role of Sn in preventing electron-hole recombination and photocorrosion was proposed
Solid state morphology and band gap studies of ETS-10 supported CdS nanoparticles
No full textEngelhard titanosilicate (ETS-10) supported cadmium sulphide (CdS) nanoparticles were synthesized and characterized by various solid state techniques including: XRD, DR UV-Vis, TEM and FESEM. The effect of different synthesis routes of CdS nanoparticles on its physicochemical character was studied. It was observed that CdS nanoparticles prepared by both in situ sulphur reduction (CdS-IS) and reverse micelle (CdS-RM) methods showed similar properties. However, CdS-IS nanoparticles are more feasible and economically practical. The reflectance measurements of the as-synthesized CdS nanoparticles are apparently blue-shifted compared to bulk CdS. This phenomenon of blue-shifted absorption edge has been ascribed to an increase in bandgap energy with a decrease in particle sizes. The bandgap of the as-synthesized CdS samples was calculated from the linear correlation of [F(R) h?]2 and h?. The bandgap of CdS in ETS-10 was noticeably slightly reduced when compared with the as-synthesized CdS (8 nm) due to the formation of cluster arrays on the pores of ETS-10
Biosynthesis of copper(II) oxide nanoparticles using Murayya koeniggi aqueous leaf extract and its catalytic activity in 4-nitrophenol reduction
No full textCopper(II) oxide nanoparticles (CuO NPs) have a wide range of applications as catalysts. The natural abundance of copper and its relatively low cost make it a viable alternative to catalysts that made from expensive precious metals such as platinum and palladium. In this study, a rapid, simple and green method was developed for the synthesis of CuO NPs using an aqueous extract of Murayya koenigii leaves. Several parameters were optimized, namely, the volume of leaf extract, pH, reaction temperature and reaction time. The optimum condition for the biosynthesis was obtained by using 3 mL of leaf extract; 10 mL of 5 mM CuSO4, at pH 11, at room temperature. The biosynthesis was completed within 50 minutes. The synthesized CuO NPs were characterized using Ultraviolet-visible Spectroscopy (UV-Vis), Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), and Transmission Electron Microscope (TEM) analyses. The UV-Vis absorption spectra confirmed the formation of CuO NPs with characteristic peak at 634 nm. The FTIR spectroscopic analysis of the biosynthesized CuO NPs confirmed the surface adsorption of the bioactive components in the leaf extract that acted as the reducing agent and stabilizing agent for the metal nanoparticles. XRD analysis showed a series of diffraction peaks at 2θ of 32.5°, 35.5°, 38.6°, 48.8°, 53.4°, 58.1°, 61.5°, 66.3°, 68.0°, 72.4° and 75.0°, corresponding to (110), (002), (111), (202), (020), (202), (113), (311), (220), (311) and (222),respectively. From TEM images, CuO NPs were of spherical shape with a mean diameter of 8.4 nm. The biosynthesized CuO NPs demonstrated good catalytic activities on the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of sodium borohydride, NaBH4 and could be reused three times without significant decreases in the catalytic activities
System Reliability Assessment of Offshore Pipelines
No full textThe title of this thesis, System Reliability Assessment of Offshore Pipelines, portrays the application of probabilistic methods in assessing the reliability of these structures. The main intention of this thesis is to identify, apply and judge the suitability of the probabilistic methods in evaluating the system reliability of offshore pipelines subjected to corrosion. The analysis was first emphasized on interpreting corrosion data as random variables and probabilistic functions, through which uncertainties of the corrosion inspection tool could be taken into account. The reliability of the pipeline was initially studied by treating the structure as an independent unit. The analysis was further elaborated for pipelines arrayed as a series system of units, with the consideration of length effects. A framework for the reliability-based maintenance model was also developed in this thesis, aiming at optimizing the pipeline system operations. Herein, the analysis was mainly focused on improving the practice of releasing corrosion inhibitors into the pipeline. The use of inhibitors is considered to be the most applied maintenance practice among pipeline industries because of its simple mechanism to fight against corrosions. Last but not least, the thesis also looked into interpreting corrosions in space using theories on hydrodynamics.Hydraulic EngineeringCivil Engineering and Geoscience
- …
