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- 검색키워드
- 저자 : Iftikhar Hussain Gul (검색결과 3 건)
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Improved photocatalytic degradation efficiency of methylene blue via MgAl2O4–graphene nanocomposite
Ali Ahmed,Gul Iftikhar Hussain,Khan Muhammad Zarrar,Javaid Farhan 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.2
In the present work, Magnesium Aluminate (MgAl2O4) nanoparticles and MgAl2O4–graphene nanocomposites with various graphene weight percentages (1, 2, 3, 4, and 5%) were prepared via sol–gel and ultra-sonication methods, respectively. The formation of the spinel phase was confirmed through XRD analysis. Scanning Electron Microscopy was used to study the morphology of the MgAl2O4 nanoparticles and their anchoring on the graphene sheets. The FTIR analysis also confirmed the presence of tetrahedral and octahedral bands at 695 and 526 cm−1, respectively. For magnesium aluminate nanoparticles, the bandgap was calculated to be 5.4 eV, which decreases to 4.9 eV with 5% graphene loading on the MgAl2O4–graphene nanocomposites. For methylene blue dye, the degradation efficiency of the 5% MgAl2O4–graphene nanocomposites was also found to be higher (90%) as compared to the pristine MgAl2O4 nanoparticles (70%). This increase in efficiency depicts their enhanced photocatalytic activity and strongly suggests that the MgAl2O4–graphene nanocomposites could be a good candidate for industrial wastewater remediation.
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Ce-Substituted Co0.5Ni0.5Fe2O4: Structural, Morphological, Electrical, and Dielectric Properties
Syed Samar Abbas,Iftikhar Hussain Gul,Shahid Ameer,Muhammad Anees 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.1
Functional nano ceramics, especially rare earth substituted ferrites, havenumerous applications in microelectronics. They have certain novelcharacteristics associated with various rare earth substitutions associatedwith electronics. A series of cerium-substituted cobalt nickel ferritenanoparticles with nominal composition CexCo0.5Ni0.5Fe2-xO4 (wherex = 0.00, 0.05, 0.10, 0.15, and 0.20) was prepared in powder form bychemical co-precipitation and sol-gel auto combustion methods. Sampleswere characterized by x-ray diffraction (XRD), scanning electronmicroscopy (SEM), Fourier transform infrared spectroscopy (FT-IR),dielectric properties, and DC electrical resistivity. XRD analysis of all thesamples confirms the formation of the spinel structure of Fd-3m spacegroup. Crystallite size “t” was found to decrease, whereas both x-raydensity “Dx” and lattice constant “a” were found to increase by increasingCe concentration from 8.35 Å to 8.36 Å and 8.37 Å for sol-gel and coprecipitation,respectively. SEM results show the presence of uniformlydistributed and almost spherical-shaped particles for both techniques. FTIR measurements were used to further confirm thecomposition, i.e., cation substitution. The DC electrical resistivity of the x = 0.00 sample is higher than Ce-substituted ferritesamples and in the range of 108 Ω-cm at 373 K. Dielectric spectroscopy is also studied from 100 Hz to 5 MHz as a function offrequency. To our knowledge, this is the first reported research of this particular composition.
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Rahim Jan,AMIR HABIB,Iftikhar Hussain Gul 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.1
In this study, graphene nanosheets (GNS) prepared through a liquid exfoliationtechnique are dispersed in thermoplastic polyurethane (TPU) at a volume fraction(Vf) of up to 0.19. Then, the electrical and mechanical properties of the obtainedcomposites are characterized. The dielectric spectroscopy shows an excessivevariation in dielectric constant (1.1 to 3.53 × 107) and dielectric tangent loss (0.03to 2515) with varying Vf over the frequency range of 25 kHz to 5 MHz. Aconsiderable enhancement in electrical conductivity (DC) is found, from3.87 × 10−10 S/m (base polymer) to 53.5 S/m for the 0.19 Vf GNS-TPUnanocomposite. The GNS-TPU composites are mechanically robust, with aconsiderable increase in stiffness (~4-fold) and strength (almost twice),maintaining its ductility up to 0.09 Vf GNS. The high dielectric constant at lowerfrequencies is attributed to the well-established Maxwell-Wagner polarizationeffect, whereas the high dielectric tangent loss is due to leakage currents as aphysical conducting network is formed at high filler loadings. The layeredstructure, high aspect ratio, and improved dispersion of GNS are the main reasonsfor the improvement in both the dielectric characteristics and the mechanicalproperties of the host polymer.
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