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- 저자 : Bandar Ali Al-Asbahi (검색결과 2 건)
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Khatatbeh Ibtehaj,Mohammad Hafizuddin Hj Jumali,Sameer Al-Bati,Poh Choon Ooi,Bandar Ali Al-Asbahi,Abdullah Ahmed Ali Ahmed 한국고분자학회 2022 Macromolecular Research Vol.30 No.3
This work demonstrated the effect of the β-chain alignment degree on piezoelectric nanogenerator (PNG) performance. A simple, safe and low-cost fastcentrifugal spinning technique was used to produce self-poled poly(vinylidene fluoride) (PVDF) nanofiber. PNG based on acetone-prepared PVDF fibers, with high β-chain alignment, generated output open-circuit voltage (VOC) and short-circuit current (ISC) five times higher than the film counterpart. In addition, the fibers showed a remarkable increase in β-chain alignment degree as the ratio of N,N-dimethylformamide (DMF) solvent increased. The optimum nanofiber with the highest β-chain alignment degree, β-fraction and piezoelectric charge coefficient of 0.93, 91.8% and -120 pC.N-1 was obtained, respectively. PNG based on the optimum fiber displayed the highest VOC, ISC and power density of 14 V, 1.4 μA and 6.7 μWcm-2, respectively. This performance is greater than any PNG made from electrospun PVDF fiber. The excellent performance of the fabricated PNGs was strongly related to the high alignment degree of β-chains parallel along the fiber axis. In addition, due to low Young’s modulus (1.63 MPa) of the optimum fibers, the related lead-free PNG is sensitive to small movements and can be used in wearable and implanted medical devices.
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Qaid Salem A. S.,Issa M. A. A.,Hassib A. M.,Al-Asbahi Bandar Ali,Abuassaj E. M.,Ahmed Abdullah Ahmed Ali 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.6
The eff ects of diff erent synthesis routes and sintering temperatures on the microstructures and electrical properties of ceramic varistors (composed of ZnO doped with Pr 6O11, Co 3O4, Cr 2O3, and Nd 2O3) were investigated. Two types of samples were prepared according to the milling approach (single-mill or double-mill). Remilling the calcined powder material reduced the required sintering temperature by 100 °C, improved the microstructure of the ceramic, and enhanced the nonlinear properties of the varistor. Though the diff erent sintering temperatures and average grain sizes, both types were reach ≈ 98% of the theoretical density. The highest nonlinear coeffi cient value was ≈ 26.5, obtained from the fi rst sample of the double- mill batch. As the sintering temperature increased, the nonlinearity diminished rapidly in the case of single-mill samples compared to double-mill ones. Similar behavior was noted for the varistor (breakdown) voltage. The thermionic emission behavior at the pre-breakdown region and the conduction mechanism through Schottky barriers were applied to fi nd further electrical parameters.
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