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RISS 인기검색어
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- 저자 : Imran Shakir (검색결과 15 건)
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Shakir, Imran,Shahid, Muhammad,Kang, Dae Joon Royal Society of Chemistry 2010 Chemical communications Vol.46 No.24
<P>Single crystalline MoO<SUB>3</SUB> and Cu<SUB>0.33</SUB>MoO<SUB>3</SUB> nanorods have been synthesized in large quantities <I>via</I> hydrothermal route, which exhibit unprecedented photocatalytic performance for the decomposition of Toluidine blue “O” (TBO) and chlorobenzene both under visible and UV light irradiation.</P> <P>Graphic Abstract</P><P>Single crystalline MoO<SUB>3</SUB> and Cu<SUB>0.33</SUB>MoO<SUB>3</SUB> nanorods have been synthesized in large quantities <I>via</I> hydrothermal route, which exhibit unprecedented photocatalytic performance for the decomposition of Toluidine blue “O” (TBO) and chlorobenzene both under visible and UV light irradiation. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c000003e'> </P>
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IN VITRO THROMBIN DOSE RESPONSE ON MADIN DARBY CANINE KIDNEY CELL MONOLAYER
RASHID AMIN,IMRAN SHAKIR,ISHRAT SULTANA,박성하,RAFAQAT HUSSAIN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.4
Epithelial cells are known to play an important role in sustaining the airway barrier that may be impaired in certain inflammatory conditions. Recently, the use of thrombin has been reported to open the airway of patients with asthma as well as enhance the permeability of endothelial cell monolayers. We designed an in vitro model of Madin Darby Canine Kidney (MDCK) cells and the physiological functions of this model were evaluated by measuring the transepithelial resistance (TER). The epithelial cytoskeletal organization was observed by staining with Bisbenzimide and Rodamine-Phalloidin (BBZ-Phalloidin) and confirmed by fluorescence microscopy. Measurements of the TER generated values up to 2020 Ω/cm2. A dose response of thrombin was observed, showing the permeability changes in the MDCK monolayer and subsequent recovery. A relationship between TER values and cytoskeletal organization was also observed and discussed.
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Enhanced photocatalytic activity of CuxNi1−xFe2O4 -rGO composite
Agboola Philips O.,Shakir Imran 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.5
Here in this article, we reported the effect of divalent metal cations Cu 2+ on photocatalytic properties of spinel nickel fer- rite (NiFe 2 O 4 ). Copper substituted, and unsubstituted nickel ferrite particles were prepared by a wet chemical route. X-ray diffraction (XRD) and Raman spectroscopy confirmed the successful formation of Cu-NiFe 2 O 4 and their composite with reduced graphene oxide (rGO). The rGO was used as conducting matrix as well as to enhance the catalytic sites on the surface of copper substituted nickel ferrites. The scanning electron microscopy (SEM) was used to confirm the preparation of Cu-NiFe 2 O 4 /rGO nanocomposite. The enhanced surface area of the prepared nanocomposite showed a drastic increase in their photocatalytic property. It was observed that photocatalytic activity of nickel NiFe 2 O 4 was enhanced up to about 30% when the crystal lattice of pure nickel ferrite was substituted by divalent copper metal ions. The Cu-NiFe 2 O 4 /rGO nanocomposite exhibited much higher degradation efficiency as compared to bare NiFe 2 O 4 . The photocatalytic activity of prepared copper substituted nickel ferrite, and their nanocomposite with reduced graphene oxide was further confirmed by electrochemical measurements. These included the electrochemical impedance spectroscopy, photocurrent response, and Mott–Schottky measurements.
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Nazar Kashif,Jaffery Mujtaba Hussain,Shakir Imran,Nazar Atif,Raza Rizwan 한국물리학회 2022 Current Applied Physics Vol.40 No.-
This paper demonstrates the mathematical and MATLAB simulation model of 1 KW (28.8Vdc) PEM fuel cell system with boost convertor and RL load to analyze the yield behavior in accordance to control the hydrogen fuel utilization. Two cases have been designed to evaluate the performance of this model. In the first case, fuel cell parameters are examined with and without a fuel regulator that controls the hydrogen fuel rate while in the second case, the operating temperature of a fuel cell stack is varied to observe the impact on the system. PEM fuel cell based power systems can become an alternate choice in the transportation sector to overcome contamination concerns, especially in South Asia where the environmental issues are at peak. The purpose of this work is to introduce such environmentally friendly system of transportation in South Asia, especially in Pakistan and this stack model can be used as a prototype for developing FC based motorbike as currently no practical models have been tested in this region. Therefore, this model has unique advantages over the existing in the literature.
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Zinc oxide-tungsten oxide (ZnO-WO3) composite for solar light-assisted degradation of organic dyes
Aziz Fatima,Warsi Al-Zoha,Somaily Hamoud H.,Din Muhammad Imran,Sabeeh Humera,Warsi Muhammad Farooq,Shakir Imran 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.6
Photocatalytic degradation of dyes is one of the most effective methods that can be utilized for a pollution-free environment. For this purpose, Tungsten oxide (WO3), zinc oxide (ZnO) and their composite WO3/ZnO were synthesized using facile route. X-rays diffraction (XRD), Fourier transform infra-red spectroscopy (FTIR) and scanning electron microscopy (SEM) confirmed their structural, spectral and morphological features, respectively. These techniques confirmed the formation of desired products. The as-prepared samples were utilized as photocatalysts for the evaluation of the photocatalytic removal of methylene blue and rhodamine B under solar light irradiation. The obtained results showed that the synergistic effect of tungsten oxide and zinc oxide is responsible for the increased charge separation and reduction in recombination chances of charge carriers that enhance the remarkable photocatalytic performance. For methylene blue and rhodamine-b, the percentage degradation was 94% and 85.7%, respectively. Different scavenger studies showed that holes are the major active species responsible for the removal of methylene blue. The EIS and Mott-Schottky plots confirmed the p-type and n-type character of WO3 and ZnO, respectively. Briefly, the as-synthesized nanocomposite showed enhanced photocatalytic behavior for the degradation of various dyes as compared to pristine metal oxides.
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Maria Yousaf Lodhi,Khalid Mahmood,Azhar Mahmood,Huma Malik,Muhammad Farooq Warsi,Imran Shakir,M. Asghar,Muhammad Azhar Khan 한국물리학회 2014 Current Applied Physics Vol.14 No.5
In this work cobalt substituted magnesium zinc nanocrystalline spinel ferrites having general formula Mg0.5CoxZn0.5xFe2O4 where x ¼ 0.1, 0.2, 0.3, 0.4, 0.5 were synthesized using micro-emulsion technique. The Co substituted samples annealed at 700 C and characterized by various characterization techniques, such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), dielectric measurements and vibrating sample magnetometer (VSM). XRD analysis confirmed single phase spinel structure and the crystalline size calculated by Scherrer’s formula found to be in 21.38e45.5 nm range. The lattice constant decreases as substitution of Co is increased. The decrease in lattice constant is attributed to the smaller ionic radius of cobalt as compared to zinc ion. The FTIR spectra reveled two prominent frequency bands in the wave number range 400e600 cm1 which confirm the cubic spinel structure and completion of chemical reaction. The dielectric parameters were observed to decrease with the increased Co contents. The peaking behavior was observed beyond 1.8 GHz. The frequency dependent dielectric properties of all these nanomaterials have been explained qualitatively in accordance with Koop’s phenomenological theory. Magnetic studies revealed that the coercivity (Hc) attains maximum value of 818 Oe at w21 nm. The increasing trend of magnetic parameters (coercivity and retentivity) is consistent with crystallinity. The crystallite size is small enough to attain considerable signal to noise ratio in high density recording media. The optimized magnetic parameters suggest that the material with composition Mg0.5Co0.5Fe2O4 may have potential applications in high density recording media.
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Ali, Zahid,Cha, Seung Nam,Sohn, Jung Inn,Shakir, Imran,Yan, Changzeng,Kim, Jong Min,Kang, Dae Joon The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.34
<P>We report Zn doped mesoporous TiO<SUB>2</SUB> microspheres synthesized <I>via</I> a combined sol–gel and solvothermal method exhibiting excellent Li-ion insertion–extraction properties. The specific capacity of Zn doped mesoporous TiO<SUB>2</SUB> microspheres was significantly higher than that of TiO<SUB>2</SUB> nanopowder at high charge–discharge rates. The superior rate performance offered by Zn doped mesoporous TiO<SUB>2</SUB> microspheres may be attributed to enhanced electronic and ionic conductivity, which was achieved by improving the donor density <I>via</I> Zn doping and by providing a well interconnected mesoporous network of nanoparticles for the effective diffusion of Li ions. Zn doped mesoporous TiO<SUB>2</SUB> microspheres showed more than an 87% capacity retention after 100 cycles at a charge–discharge rate of 1 C, demonstrating it to be a promising approach for the development of high-performance Li ion batteries.</P> <P>Graphic Abstract</P><P>Zn doping in mesoporous TiO<SUB>2</SUB> microspheres exhibited excellent electronic and ionic conductivity for the realization of a highly stable lithium ion battery with superior rate performances. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm33315e'> </P>
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