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Monitoring of acrylamide carcinogen in selected heat-treated foods from Saudi Arabia
Mohammad Rizwan Khan,Zeid Abdullah ALOthman,Mu. Naushad,Ahmed Khodran Alomary,Sulaiman Mohammed Alfadul 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.4
The present study reports the outcomes of assessment on acrylamide levels in selected heat-treated foods of diverse brands and origins from Saudi Arabia. In chips, acrylamide level was detected from 28 to 954 lg/kg, sample 7 (salted) contained higher amount (954 lg/kg) whereas, sample 8 (labneh and mint) comparatively produced lower amount (28 lg/kg). Nuts and dried fruits have generated acrylamide from 2 to 93 lg/kg, salted peanut of Indian origin produced higher amount (93 lg/kg) while apricot (plain) relatively generated lower amount (2 lg/ kg). The levels of acrylamide in biscuits, pastry, cacao, chocolate, olive, cheese, corn, oat and wheat flakes, and bread were found from 26 to 234 lg/kg. Biscuits generated high concentration (234 lg/kg) while corn flakes fairly generated lower amount (26 lg/kg). The obtained results have shown a great variation of acrylamide content and reason might be due to foods type, cooking ingredients and, cooking methods, time and temperature.
Improved optical transparency of cuo films prepared by using quantum-dot ink on glass substrates
Khan, Rizwan,Yun, Jin Hyeon,Lee, In-Hwan,Vaseem, Mohammad,Hahn, Yoon Bong 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol. No.
<P>The present investigation reports a simple solution process for synthesizing CuO quantum dots at low temperature without using surfactants or templates. Detailed structural characterizations revealed that the as-prepared CuO quantum dots were uniform and dense with high crystallinity. As-prepared CuO quantum dots were used as an ink to prepare CuO films on glass substrates via a spin-coating method. The effects of annealing temperature on the optical properties of CuO films were investigated. The optical transparency of the CuO films showed an improved transmittance of > 80% at a wave length of 800 nm after annealing at 300 A degrees C. In addition, the band-gap energy was observed to decrease from 1.70 to 1.28 eV with increasing annealing temperature from 300 to 500 A degrees C due to the improvement in the crystallinity with grain growth in the films.</P>
Improved Optical Transparency of CuO Films Prepared by using Quantum-dot Ink on Glass Substrates
Rizwan Khan,Jin Hyeon Yun,이인환,Mohammad Vaseem,한윤봉 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.1
The present investigation reports a simple solution process for synthesizing CuO quantum dots at low temperature without using surfactants or templates. Detailed structural characterizations revealed that the as-prepared CuO quantum dots were uniform and dense with high crystallinity. As-prepared CuO quantum dots were used as an ink to prepare CuO films on glass substrates via a spin-coating method. The effects of annealing temperature on the optical properties of CuO films were investigated. The optical transparency of the CuO films showed an improved transmittance of > 80% at a wave length of 800 nm after annealing at 300 C. In addition, the band-gap energy was observed to decrease from 1.70 to 1.28 eV with increasing annealing temperature from 300 to 500 C due to the improvement in the crystallinity with grain growth in the films.
Blends of polyurethane-polymethyl methacrylate/TiO2-based composites
Mohammad Zuber,Shazia Tabasum,Rizwan Hussain,Muhammad Bilal Khan,Iftikhar Hussain Bukhari 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.8
Polyurethanes (PUs) prepolymer was prepared by the reaction of toluene-2,4-diisocyanate (TDI) and poly caprolactone diols and the chain was further extended with 1,4-butane diol (1,4-BDO) to get final polyurethane (PU). FTIR spectra of the monomers, PU prepolymer, chain extender and final PU confirmed the reaction progress. A series of blends were prepared by varying the percent compositions of prepared PU, procured polymethyl methacylates (PMMA)and titanium dioxide (TiO2). Pellets were formed from the prepared blends (PU-PMMA/TiO2) using a self-designed mechanical tool. Scanning electron microscope (SEM) images were also taken to confirm the incorporation of the TiO2contents into the prepared blends. Mechanical properties such as hardness and compressive strength were studied and discussed. The results of the study reveal that the blended sample having 80% PU, 20% PMMA content with 2.5 g TiO2 in 100 g mixture of PU and PMMA is very suitable for suggesting dental materials.
Afshan Ilyas,Mohammad Ayyub,M. Rizwan Khan,Mohammed Aslam Husain,Abhinandan Jain 한국전기전자재료학회 2018 Transactions on Electrical and Electronic Material Vol.19 No.3
Solar photovoltaic systems have evolved as a prominent renewable source of energy owing to its eco-friendly nature, longlifetime, and low maintenance requirement. However, its conversion effi ciency is very low. Diff erent maximum power pointtracking (MPPT) techniques have been used to extract maximum power from the photovoltaic system. In this study, theperturb and observe (P&O) MPPT algorithm, which is practically implemented on an Arduino Uno board and simulated inMatlab/Simulink under the same environmental conditions, is used to track the maximum power. Diff erent parameters ofa Simulink-based PV module and a practical photovoltaic module are obtained and compared. The main advantages of theP&O MPPT algorithm are its low cost and easy implementation. However, it may fail to track the maximum operating pointunder varying environmental conditions.
Mu. Naushad,Moonis Ali Khan,Zeid Abdullah ALOthman,Mohammad Rizwan Khan 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
The adsorptive potential of De-Acidite FF-IP resin for the removal of nitrate (NO3) from synthetic as well as commercially available bottled water samples was testified. Ultra-performance liquid chromatogra-phy–mass spectrometry (UPLC–MS) was utilized for detection and determination of NO3 . Optimum NO3 adsorption was observed at pH range 2 to 6. Kinetic studies revealed the applicability of pseudofirst-order kinetic model for analyzed concentration range (100–300 mg/L) while, the equilibration time (25 min) was independent of initial NO3- concentration. The breakthrough capacities in Milli-Q and tap water were 35 and 30 mg/g, respectively.
Suba Lakshmi Madaswamy,Saikh Mohammad Wabaidur,Mohammad Rizwan Khan,이수출,Ragupathy Dhanusuraman 한국고분자학회 2021 Macromolecular Research Vol.29 No.6
In this work, a metal free polyaniline nanorod (PANI-NR) with graphitic carbon nitride (GCN) nanocomposite has been synthesized by solar irradiation approach an acidic medium without the assistance of any surfactant and template. As synthesized PANI-NR/GCN nanocomposite was characterized by morphology studies, which found that the average diameter of the PANI-NR was 500 to 600 nm and the length of the nanorod range from 3 to 3.5 μm where GCN randomly dispersed on the surface of PANI-NR. The elemental composition, structural and vibrational spectra of PANI-NR/GCN are observed through EDX, Mapping, XRD, and FT-IR studies. Subsequently, the synthesized PANI-NR/GCN nanocomposite was used as an electrocatalyst, which was characterized through cyclic voltammetry, impedance, and chronoamperometric studies. The fabricated PANI-NR/GCN modified electrode shows significant electrocatalytic activity, lower charge resistance, high stability, and longevity towards methanol oxidation reaction (MOR) in an alkaline medium.
Ilyas, Afshan,Ayyub, Mohammad,Khan, M. Rizwan,Husain, Mohammed Aslam,Jain, Abhinandan The Korean Institute of Electrical and Electronic 2018 Transactions on Electrical and Electronic Material Vol.19 No.3
Solar photovoltaic systems have evolved as a prominent renewable source of energy owing to its eco-friendly nature, long lifetime, and low maintenance requirement. However, its conversion efficiency is very low. Different maximum power point tracking (MPPT) techniques have been used to extract maximum power from the photovoltaic system. In this study, the perturb and observe (P&O) MPPT algorithm, which is practically implemented on an Arduino Uno board and simulated in Matlab/Simulink under the same environmental conditions, is used to track the maximum power. Different parameters of a Simulink-based PV module and a practical photovoltaic module are obtained and compared. The main advantages of the P&O MPPT algorithm are its low cost and easy implementation. However, it may fail to track the maximum operating point under varying environmental conditions.
Ibrahim Hotan Alsohaimi,Moonis Ali Khan,Zeid Abdullah ALOthman,Mohammad Rizwan Khan,Mahendra Kumar,Albandary Mohammad Al mahri 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-
Iron hydr(oxide) based multi-walled nanotubes (Fe-CNTs) nanocomposite was synthesized, and its adsorptive potential for BrO3 removal from synthetic and commercially available bottled water samples was tested. Residual BrO3 concentration was determined using ultra-performance liquid chromatography-tandem mass. Spectroscopic and morphological studies revealed that anchored Fe ions on the nanocomposites surface/in the walls were responsible for BrO3 adsorption without causing structural defects to CNTs. Rapid adsorption kinetics was observed, accomplishing 65–85% adsorption at varied concentrations in 5 minutes. Elution study showed optimum BrO3 recovery with 0.1 M HCl. Bottled water samples treatment with Fe-CNTs nanocomposite showed residual BrO3 concentration below instrumental detection limit.