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RISS 인기검색어
- 검색키워드
- 저자 : Zeinab Ramezani (검색결과 2 건)
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Zeinab Ramezani,Ali A. Orouji 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.71 No.4
This paper suggests and investigates a double-gate (DG) MOSFET, which emulates tunnel field effect transistors (M-TFET). We have combined this novel concept into a double-gate MOSFET, which behaves as a tunneling field effect transistor by work function engineering. In the proposed structure, in addition to the main gate, we utilize another gate over the source region with zero applied voltage and a proper work function to convert the source region from N+ to P+. We check the impact obtained by varying the source gate work function and source doping on the device parameters. The simulation results of the M-TFET indicate that it is a suitable case for a switching performance. Also, we present a two-dimensional analytic potential model of the proposed structure by solving the Poisson’s equation in x and y directions and by derivatives from the potential profile; thus, the electric field is achieved. To validate our present model, we use the SILVACO ATLAS device simulator. The analytical results have been compared with it.
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Mohammad Reza Ramezani,Zeinab Ansari-Asl,Elham Hoveizi,Ali Reza Kiasat 한국섬유공학회 2020 Fibers and polymers Vol.21 No.5
Fabrication of nanofibrous scaffolds of biodegradable polymers provides a great premise for several biologicalapplications. In this study, nanofibrous polycaprolactone (PCL) mats incorporating Fe-MOF (PCL/x%Fe-MOF, x=5, 10, 20)were fabricated by electrospinning technique. The Fe-MOFs were separately synthesized by the hydrothermal method andthen were added to PCL solution for preparation of nanofibrous composites. The presence of Fe-MOF in the fibers wasdemonstrated by various methods including FT-IR (Fourier-transform infrared), PXRD (powder X-ray diffraction), EDS(energy dispersive X-ray spectroscopy) mapping, SEM (scanning electron microscope), and TEM (transmission electronmicroscope). In the FT-IR spectra of the nanocomposites, the characteristic bands for the pure PCL and Fe-MOF showed nosignificant change in their positions, suggesting a weak chemical interaction with each other, although they physically mixeduniformly. Nanofibrous structure of the as-prepared nanocomposites was confirmed by SEM and TEM images. The diameterof PCL nanofibers was measured to be 369 nm. Biological investigations indicated that the experimented scaffolds includingPCL/5%Fe-MOF and PCL/10%Fe-MOF nanofibrous scaffolds provided appropriate surface and mechanical properties suchas cellular biocompatibility, high porosity, chemical stability, and optimum fiber diameter for cell adhesion, viability, andproliferation compared with PCL and PCL/20%Fe-MOF nanocomposites. Indeed, our results demonstrated that percent ofFe-MOF in the composites played a significant role in cell attachment and viability. Also, according to the implantationstudies, up to at least 4 weeks, none of the animals showed any inflammatory response. Totally, we can be claimed that themodified electrospun scaffolds have been developed for tissue engineering applications.
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