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Articles 31 - 47 of 47
Full-Text Articles in Materials Chemistry
Development Of An Electrochemical Immunosensor For Direct Detection Of Acrylamide In Food Samples, Pei Ying Lau
Development Of An Electrochemical Immunosensor For Direct Detection Of Acrylamide In Food Samples, Pei Ying Lau
Student Works (2020-2029)
Acrylamide, a potential carcinogen which is mainly found in plant-based food such as potato chips, French fries, bread, biscuit, coffee and coco, after undergoing heating process at temperature above 120°C. The permissible maximum intake of acrylamide is 2.6 μg kg−1 of body weight per day to prevent cancer risk. Due to its neurotoxicity and carcinogenicity, a rapid detection method for acrylamide is strongly needed in food safety concern. Herein, a sample pre-treatment free electrochemical immunosensor was developed based on a displacement assay. In a displacement assay format, an antibody is initially bound to the surface immobilized hapten (analyte analogue) and …
Copolymerization Of Methyl Methacrylate With Palm Oleic Acid-Based Macromers And Application Of The Copolymers As Coating Materials., Shahla Ataei Kachouei
Copolymerization Of Methyl Methacrylate With Palm Oleic Acid-Based Macromers And Application Of The Copolymers As Coating Materials., Shahla Ataei Kachouei
Student Works (2010-2019)
This study concerns the synthesis and characterization of three different palm oleic acid-based macromers made from oleic acid, together with phthalic anhydride and glycerol. The molecular structure of the macromers had been varied by using 28, 40 and 65 wt% of oleic acid in the overall formulation and labeled as AlkOA28, AlkOA40 and AlkOA65 respectively. The extent of reaction at the end of polycondensation reaction in making each macromer was more than 95%. Thermal degradation studies of three macromers revealed that AlkOA28 macromer has a relatively higher thermal stability and followed by AlkOA40 and AlkOA65. From Kissinger method, activation energy …
Superplastic Boronizing On Duplex Stainless Steel (Dss) Using Compression Method., Yong Siu Fung
Superplastic Boronizing On Duplex Stainless Steel (Dss) Using Compression Method., Yong Siu Fung
Student Works (2010-2019)
The formation and growth of boride phases on duplex stainless steel (DSS) during superplastic boronizing (SPB) were studied in comparison with conventional boronizing (CB) from previous research. SPB is a surface hardening technique that combines boronizing with superplastic deformation. It utilizes the ultra high plasticity phenomenon in metal while carrying out boronizing in which boron atoms are diffused into the metal substrate to form hard boronized layer. The SPB process was conducted under compression mode at a strain rate of 2 × 10-4 s-1, at three different temperature conditions (1223 K, 1273 K, 1373 K) and strains (0.2 to 0.6). …
Palm Oil-Based Polyester Binder For Making Fiberboards., Wong Yew Chuan
Palm Oil-Based Polyester Binder For Making Fiberboards., Wong Yew Chuan
Student Works (2010-2019)
Palm kernel oil was used as a raw material for the synthesis of polyester polyol.The palm oil based polyester polyol was synthesized using glycerol, phthalic anhydride and fumaric acid. Palm oil based polyester polyol combines with methylene diphenyl diisocyanate (MDI) to form the polyurethane binder. The fibers are derived from empty fruit bunch (EFB) of the palm tree and have the acceptable mechanical properties. In this project, palm fibers were converted into palm fiberboards by using polyurethane (PU) binder under specified pressure and temperature. The binder to fiber ratio was varied from 10% to 30 % by dried weight of …
Synthesis And Characterization Of Zinc Oxide Nanostructures., Khalifa Said Zahran Al-Azri
Synthesis And Characterization Of Zinc Oxide Nanostructures., Khalifa Said Zahran Al-Azri
Student Works (2010-2019)
The growth mechanism, morphology, structure and optical properties of the ZnO nanostructures grown on bare and gold-coated silicon substrates using carbothermal reaction at atmospheric pressure were investigated under different growth conditions. The ZnO nanostructures formed were studied as a function of substrate location, furnace temperature, Ar gas flow rate, deposition time and ZnO powder to carbon powder mass ratio. The morphology and structure of the samples were characterized using the fieldemission scanning electron microscopy (FESEM), energy dispersive x-ray spectroscopy(EDX) spectrum, x-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). It was found that in both silicon and gold-coated silicon …
The Thermoluminescence Properties Of Manganese Doped Zns Nanophosphor., Khalid Humaid Zahir Al-Hinai
The Thermoluminescence Properties Of Manganese Doped Zns Nanophosphor., Khalid Humaid Zahir Al-Hinai
Student Works (2010-2019)
The thermoluminescence (TL) properties of Manganese (Mn) doped ZnS nanophosphors were investigated after gamma irradiation at room temperature. The ZnS:Mn nanophosphors were prepared by chemical precipitation method by using Zinc sulfate, Sodium sulfide and Manganese sulfate. 1 mole, 2 moles and 3 moles of Manganese sulfate were used to have different concentrations of Mn in doped ZnS. The formation of the nanophosphors was characterized by high resolution scanning electron microscopy FESEM, XRD and EDX. The obtained products consist of particles with the dimension about 85–150nm. Comparison between ZnS nanophosphors and commercial ZnS powder glow curves was studied. It was observed …
Production Of Multiwall Carbon Nanotube For Alcohol Sensor Application., Ebtehal Saleh Alshaqaq
Production Of Multiwall Carbon Nanotube For Alcohol Sensor Application., Ebtehal Saleh Alshaqaq
Student Works (2010-2019)
Multiwall carbon nanotube/polyethylene oxide (PEO), multiwall carbon nanoube/polyvinyl alcohol(PVA) and multiwall carbon nanotube/ polyvinyl alcohol(PVA)/zinc oxide(ZnO) have been tested as chemical sensors and detailed study on the effect of different gas concentration and material properties on gas sensitivity is presented. Initial composites were prepared by a simple solution casting and characterized by x-ray diffraction for ZnO, Fourier transform infra-red spectroscopy (FTIR) and scanning electron microscopy (SEM) to demonstrate crystallite size of ZnO, the morphology and surface area respectively. On the other hand, MWCNT/PEO , MWCNT/PVA , MWCNT/PVA/ZnO were prepared with different loading MWCNT and ZnO. The chemical sensing properties of …
Synthesis And Characterization Of Silicon Oxide And Silicon Carbide Nanostructures., Majid Salim Mohammed Al-Ruqieshi
Synthesis And Characterization Of Silicon Oxide And Silicon Carbide Nanostructures., Majid Salim Mohammed Al-Ruqieshi
Student Works (2010-2019)
Silicon oxide nanostructures have attracted extensive interests in recent years due to their physical and optical properties. SiOx nanostructures are synthesized by catalytic and non-catalytic approaches. With catalytic approach, long and uniform amorphous silicon oxide nanowires, nanofibers (comet and tree like), nanocakes and nanocages were synthesized on Si substrate by carbothermal evaporation reactions of TiO2 at high temperature. The SiOx nanowires were about 13 nm to 243 nm in diameters and 194 nm to several microns in length and the nanofibres with diameter between 8 nm to 30 nm and around 50 nm to 2.5μm in length. The diameter and …
Formation Of Copper Dots In Copper Decoration Technique, Swee Yong Pung
Formation Of Copper Dots In Copper Decoration Technique, Swee Yong Pung
Student Works (2000-2009)
Copper ions are dissolved from highly pure copper plate into the methanol during copper decoration process. As a result, copper concentration in methanol is increased with time. The copper concentration in methanol measured by ICP-OES is correlated well with the calculated value based on the magnitude of current and time during the process. Consequently, higher magnitude of current can be applied to build up copper concentration in methanol in shorter period. When copper ions are ejected in methanol, they are positively charged. They experience force from electric field and migrate towards oxide surface. Eventually, these copper ions will be discharged …
Preparation And Characterization Of Lithiated Cathode Materials For Lithium Batteries, Shanti Navaratnam
Preparation And Characterization Of Lithiated Cathode Materials For Lithium Batteries, Shanti Navaratnam
Student Works (2000-2009)
Four different cathode materials, LiNiO₂, LiCoO₂, LiCo₀.₂ Ni₀.₈O₂ and LiCo₀.₄, Ni₀.₆O₂ were synthesized by sol - gel technique. The prepared materials were characterized X-ray diffraction pattern, FT-IR and cyclic voltammetry. X-ray diffraction pattern shows crystallinity of materials, increases with higher calcination temperature. From FT- IR studies, it was shown, that the purity of sample also increased with prolong heating at higher temperatures. It was possible to obtain pure and highly crystalline LiNiO₂ after heating for fourteen hours at 800°c. Cyclic voltammetry shows the four prepared materials are suitable for fabrication of cathode, as lithium ions can intercalate and de-intercalate. LiNiO₂ …
The Effect Of Aluminium Oxide And Cerium Oxide As Dispersoids In Chitosan-Lithium Acetate Complexes, Hoi Mien Leow
The Effect Of Aluminium Oxide And Cerium Oxide As Dispersoids In Chitosan-Lithium Acetate Complexes, Hoi Mien Leow
Student Works (2000-2009)
In this study, chitosan with 85% deacetylation was used with Ni(OAc)₂·2H₂O as doping salt and Al₂O₃, or CeO₂ as dispersoid. They were mixed in certain weight percentages and dissolved in 100ml of 0.5% acetic acid solution. These solutions were poured into petri dishes and left at room temperature for film formation. Infrared Spectroscopy has shown that there is interaction between chitosan and LiOAc with and without dispersoid. The peaks are shifted. broadened. split and differs in intensity. The electrical conductivity of all samples was calculated using the bulk resistance value obtained from the complex admittance plot. The highest electrical conductivity …
Sulphide Based Materials As Potential Anodes In Lithium Ion Cells, Azlin Sanusi
Sulphide Based Materials As Potential Anodes In Lithium Ion Cells, Azlin Sanusi
Student Works (2000-2009)
Sulphides based compounds PbS and SnS have been studied as possible anode material in lithium ion cell. PbS was prepared by the chemical bath deposition technique and SnS by the double decomposition method. Both samples were characterized by the powder X-ray diffraction technique and energy dispersive analysis of X-rays (EDAX). The room temperature electrical conductivity of PbS is 2.6 x 10⁻⁴ S cm⁻¹ and SnS is 5.3 x 10⁻⁷ S cm⁻¹ while at 90°C the electrical conductivity of PbS is 3.3 x 10⁻⁴ S cm⁻¹ and SnS is 2.90 x 10⁻⁶ S cm⁻¹ Cyclic voltammetry determined the potential anode ability …
Synthesis And Characterization Of Lithiated Mixed Metal Oxides For Lithium Ion Rechargeable Batteries, Seng Gee Tan
Synthesis And Characterization Of Lithiated Mixed Metal Oxides For Lithium Ion Rechargeable Batteries, Seng Gee Tan
Student Works (2000-2009)
Lilhiated mixed metal oxides for lithium ion rechargeable batteries were prepared by the sol gel technique. Samples consisting of lithium acetate, nickel nitrate, cobalt nitrate, manganese acetate and aluminium fluoride were characterised using X-ray Diffraction (XRD), Differential Scanning Calorimetry (DSC), Fourier Transform Infrared Spectroscopy (FTIRS). Energy Dispersive Analysis of X-rays (EDAX) w1d Cyclic Voltammetry (CV). Thermal characterization shows that the acetates, nitrates and fluorides of precursors material deform at temperature between 50° to 100°C and the products begin to form at a temperature between 264°C to 271°C. FTIR studies show that the materials must be heated for a longer time …
Development Of Solid State Uv Detector Using Commercial Tld And Ln2o3:Re3+ (Ln=Y, La, Gd; Re=Tm, Tb, Eu, Er, Pr), Abdullah Mohd. Noh
Development Of Solid State Uv Detector Using Commercial Tld And Ln2o3:Re3+ (Ln=Y, La, Gd; Re=Tm, Tb, Eu, Er, Pr), Abdullah Mohd. Noh
Student Works (2000-2009)
Dosimetry of terrestrial ultraviolet (UV) using thermoluminescence (TL) material is an attractive method for a number of reasons. Such as the low cost per phosphor, the possibility to produce them in laboratory with simple facilities, the absence of any associated electronics at the site of measurement and the small size of solid phosphors which can also be used in personal dosimetry. In this research, we are searching for a suitable lanthanide oxide powder and commercial TLD material that can detect solar UV radiation using intrinsic method. The investigated lanthanide oxide powders include Gd₂O₃, La₂O₃ and Y₂O₃ doped with different rare …
Effect Of Electron-Attracting Groups On The Thermal Stability Of Subtituted Copper (Ii) Benzoate, Fauziah Kamaruddin
Effect Of Electron-Attracting Groups On The Thermal Stability Of Subtituted Copper (Ii) Benzoate, Fauziah Kamaruddin
Student Works (2000-2009)
Copper(II) benzoate, copper(II) 4-fluorobenzoate, copper(II) 4-chlorobenzoate, copper(II) 4-bromobenzoate, copper(II) 4-iodobenzoate, copper(II) pentafluoro benzoate, copper(II) 4-nitrobenzoate and copper(II) 3,5-dinitrobenzoate are potential low dimensional thermally stable molecular electronics. The them1al properties of these samples are investigated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). TGA reveals that copper(II) benzoate (CB) slowly decomposed at 243.5°C, losing 67.7% of its weight at 515°C. The DSC shows two endotherms separated by an exotherm. The first endotherm at 224°C may due to the breaking of bridging bond to give benzoyloxy radicals. The exotherm at 231°C may due to the formation of volatiles from the decomposition …
Characterization Of Lithium Intercalation Oxides Based On Manganese And Copper, Vengidason Seguprakash
Characterization Of Lithium Intercalation Oxides Based On Manganese And Copper, Vengidason Seguprakash
Student Works (2000-2009)
In this study, several lithium intercalation compounds have been synthesized and characterized. Lithium manganese copper oxide cathode materials were prepared by sol gel method using tartaric acid as the gelating agent. Five types of cathode materials were synthesized. The sol gel technique has permitted the synthesis of manganese oxides that are capable of reversibly intercalating large amounts of lithium ions. To see the effect of adding copper to lithium manganese oxide several experiments were carried out. These include X-Ray diffraction to see whether the LiMn₂O₄ lattice has widened or collapsed. It was seen that LiMn₂O₄ and LiCu₂O₂ XRD patterns were …
Electrodeposition Of Copper On Polished Copper Electrode, Jia Tsung Ling
Electrodeposition Of Copper On Polished Copper Electrode, Jia Tsung Ling
Student Works (2000-2009)
This project studies the surface morphology of the copper deposit from three different bath solutions on polished copper (3.1 mm in diameter) electrode by using Scanning Electron Microscopy. The behaviour of glycine as an additive in a bath solution containing 0.3 M of copper (II) sulphate and 2.2 M of sulphuric acid was studied by using cyclic voltammetry. In this project, glycine did not involved directly in the reaction of CU²⁺/CU couple but increased the potential and current density of the plating process. However, glycine has the properties for inhibiting the deposition of copper onto the copper disc. Moreover, block …