排序方式: 共有16条查询结果,搜索用时 32 毫秒
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Sazlinda Kamaruzaman Peter C. Hauser Mohd Marsin Sanagi Wan Aini Wan Ibrahim Salasiah Endud Hong Heng See 《Analytica chimica acta》2013
A simple adsorption/desorption procedure using a mixed matrix membrane (MMM) as extraction medium is demonstrated as a new miniaturized sample pretreatment and preconcentration technique. Reversed-phase particles namely polymeric bonded octadecyl (C18) was incorporated through dispersion in a cellulose triacetate (CTA) polymer matrix to form a C18-MMM. Non-steroidal anti-inflammatory drugs (NSAIDs) namely diclofenac, mefenamic acid and ibuprofen present in the environmental water samples were selected as targeted model analytes. The extraction setup is simple by dipping a small piece of C18-MMM (7 mm × 7 mm) in a stirred 10 mL sample solution for analyte adsorption process. The entrapped analyte within the membrane was then desorbed into 100 μL of methanol by ultrasonication prior to high performance liquid chromatography (HPLC) analysis. Each membrane was discarded after single use to avoid any analyte carry-over effect. Several important parameters, such as effect of sample pH, salting-out effect, sample volume, extraction time, desorption solvent and desorption time were comprehensively optimized. The C18-MMM demonstrated high affinity for NSAIDs spiked in tap and river water with relative recoveries ranging from 92 to 100% and good reproducibility with relative standard deviations between 1.1 and 5.5% (n = 9). The overall results obtained were found comparable against conventional solid phase extraction (SPE) using cartridge packed with identical C18 adsorbent. 相似文献
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Hyder H. Balla Shahrir Abdullah Wan Mohd Faizal WanMahmood M. Abdul Razzaq Rozli Zulkifli Kamaruzaman Sopian 《Research on Chemical Intermediates》2013,39(6):2801-2815
A metallic nanofluid is a suspension of metallic nanoparticles in a base fluid. Multi-metallic nanoparticles are a combination of two or more types of metallic particles. Such multi-metallic nanoparticles were suspended in water using an ultrasonic vibrator for different total volume fractions and different ratios of metallic/metallic nanoparticles. A transient hot wire setup was built to measure the thermal conductivity of the nanofluid at different temperatures. The experimental results were in good agreement with the results in the literature. Then, the experimental results were used as input data for an adaptive neural fuzzy inference system (ANFIS) to predict the thermal conductivity of the multi-metallic nanofluid. The maximum deviation between the ANFIS results and experimental measurements was 1 %. The predicted results and the experimental data were compared with other models. The ANFIS model was found to have good ability to predict the thermal conductivity of the multi-metallic nanofluid over the range of the experimental results. 相似文献
4.
Zal U’yun Wan Mahmood Nik Azlin Nik Ariffin Abdul Kadir Ishak Norfaizal Mohamed Mei Wo Yii Kamaruzaman Ishak Zainab Pa’wan 《Journal of Radioanalytical and Nuclear Chemistry》2012,291(3):901-906
A method is described for the determination of 90Sr in environmental samples using combination of developed in-house method, Eichrom Sr resin and Beta Counter. Strontium was
efficiently, rapidly and simply separated from Ca and other interfering matrix components by Eichrom Sr resin. All the results
in general showed good accuracy, high precision, reliable and in good agreement between these two measured and certified value
of SRM (i.e. IAEA-375, IAEA-326, IAEA-152 and IAEA-414). As a whole, the procedure described in this work notably improves
conventional methods in particular concerning the time needed, sample volume, safer and others. Thus, the introduced method
was successfully performed and will be applied to actual sample for the determination of 90Sr in different environmental materials such as soil, sediments, milk, biological sample, water etc. 相似文献
5.
Sopian Kamaruzzaman Alwaeli Ali H. A. Al-Shamani Ali Najah Elbreki A. M. 《Journal of Thermal Analysis and Calorimetry》2019,136(1):147-157
Journal of Thermal Analysis and Calorimetry - The temperature rise in photovoltaic cells causing drop in their open-circuit voltage is a serious issue to be dealt with. A wide range of cooling... 相似文献
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Mohd Marsin Sanagi Iqbal Hussain Wan Aini Wan Ibrahim Noorfatimah Yahaya Sazlinda Kamaruzaman Nurul Nabilah Zainal Abidin 《Separation & Purification Reviews》2016,45(1):28-49
Sample preparation is the backbone of any analytical procedure; it involves extraction and pre-concentration of the desired analytes; often at trace levels. The present article describes the applications of nanomaterials (carbon-based inorganic and polymeric materials) in miniaturized extraction such as solid phase micro-extraction, stir-bar sorptive extraction, liquid phase micro-extraction, and dispersive liquid phase micro-extraction in the analyses of aqueous samples. The nanoparticles used for micro-extractions are discussed on the basis of their chemical natures. The synthetic route and the preparation of nanomaterials are described along with the optimization strategies for micro-extraction. A comparison between the conventional materials and nanomaterials for micro-extraction is proposed. The key roles of the nanomaterials for the micro-extraction of different analytes such as drugs, pesticides, polycyclic aromatic hydrocarbons, proteins and peptides from aqueous samples are reported. The use of nanomaterials, combined with miniaturized micro-extraction techniques, proved to be highly promising for sample preparation of various matrices with analytes at trace levels. 相似文献
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Nur Fairuz Rostan Suhaila Sepeai Rozan Mohamad Yunus Norasikin Ahmad Ludin Mohd Asri Mat Teridi Mohd Adib Ibrahim Kamaruzzaman Sopian 《Surface and interface analysis : SIA》2020,52(7):422-432
Silicon (Si) solar cell has low optical absorption because of the low and indirect bandgap of Si, and the efficiency was trapped at 25% for 15 years. Si solar cell is able to achieve efficiency up to 30% by adding perovskite as multiple bandgap material through tandem formation. In this paper, the Si/perovskite interface layer was characterized to study the compatibility of perovskite on fluorine-doped tin oxide (FTO) glass and p-type Si wafer (p-Si). The single solution deposition step of methyl ammonium lead iodide, CH3NH3PbI3 (MAPbI3) perovskite film, was spin-coated at different concentration. The physical properties of the MAPbI3/FTO and MAPbI3/p-Si were obtained by profilometer, atomic force microscope, X-ray diffraction, and Raman spectroscopy. The optical properties were analyzed by ultraviolet-visible spectroscopy, photoluminescence, and infrared transmission. Then the electrical properties were measured by Hall effect. From the measurement, it is observed that 1.2M concentration of MAPbI3 thin film has the highest thickness, smoothest film surface, and largest crystallite size compared with 0.8M and 1.0M. It is found that there is an interaction in perovskite/Si interface and caused in a low-wavelength shift, and the increase in concentration of MAPbI3 helped in intensifying the Raman signal produced. 1.2M MAPbI3 thin film had the highest enhancement in light trapping property rather than 0.8M and 1.0M. The bulk concentration and conductivity of 1.2M perovskite were higher, but the resistivity was lower than 0.8M MAPbI3 because of more CH3NH3I and PbI2 concentration within MAPbI3 perovskite compound. 相似文献
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Mei Wo Yii Zal U’yun Wan Mahmood Zaharudin Ahmad Nurrul Assyikeen Md. Jaffary Kamaruzaman Ishak 《Journal of Radioanalytical and Nuclear Chemistry》2011,289(3):653-661
Study for distribution of Naturally Occurring Radioactive Materials (NORM) i.e. 226Ra, 228Ra and 40K in the east coast of Peninsular Malaysia Exclusive Economic Zone (EEZ) was carried out as part of the national marine environment
project. Sixteen marine sediment cores from selected locations within the EEZ were collected for determination of NORM activity
concentrations using high-purity germanium (HPGe) gamma spectrometer. From the measurement, the activity concentration of
226Ra, 228Ra and 40K is ranged from 16 ± 4 Bq/kg to 46 ± 6 Bq/kg (total mean 30), 28 ± 7 Bq/kg to 87 ± 11 Bq/kg (total mean 56) and 171 ± 33 Bq/kg
to 690 ± 89 Bq/kg (total mean 420), dry wt., respectively. The activity concentrations of radionuclides in most of the core
were quite uniform suggesting that there were thorough vertical mixed of sediment throughout the core. The results obtained
were also in good agreement with those previous reported from other countries in the region and therefore can be used to enhance
present radioactivity database. The calculated external hazard values were ranged from 0.25 to 0.51 with the mean of 0.38
(less than unity) showed little risk of external hazard to the workers handling the sediments and it was likely low level
of the mainland natural gamma-radiation in the east coast of Peninsular Malaysia. 相似文献
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M. A. Mat‐Teridi Asif Ali Tahir S. Senthilarasu K. G. U. Wijayantha M. Y. Sulaiman N. Ahmad‐Ludin M. A. Ibrahim K. Sopian 《固体物理学:研究快报》2014,8(12):982-986
Nanostructured nickel oxide (NiO) photoelectrodes were fabricated with controlled morphology and texture using single‐step aerosol‐assisted chemical vapour deposition (AACVD). The durable one‐step film fabrication process resulted in highly crystalline columnar structure. Texture controlled films were also fabricated from granular to crystalline columnar morphology by controlling the deposition temperature. The thin film electrodes are highly reproducible and possess an optical bandgap of ~3.7 eV and exhibit cathodic photocurrent. (© 2014 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim) 相似文献
10.
Muneer M. Ba-Abbad Abdul Amir H. Kadhum Abu Bakar Mohamad Mohd S. Takriff Kamaruzzaman Sopian 《Research on Chemical Intermediates》2013,39(5):1981-1996
The photocatalytic degradation of chlorophenols was evaluated under direct solar radiation using commercial ZnO catalyst. Effects of several parameters such as a catalyst loading, pH of solution and initial concentration on the degradation process have been investigated. The photocatalytic degradation efficiency of chlorophenols at the optimum value of the parameters was compared under similar experimental conditions. The results of efficiency and mineralization showed the degradation of 2-chlorophenol and 2,4-dichlorophenol compound with the first order kinetic rate and the rate constant decreases as the initial concentration of the chlorophenols increase. However, the rate constant was strongly affected by type of chlorophenols compound present either 2-chlorophenol or 2,4-dichlorophenol. The highest removal of chlorophenols was obtained after 120 min and the final intermediate compounds of chlorophenols degradation are lower molecular weight compound consisting of acetic acid which was analyzed through the HPLC. 相似文献