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      저자 : Mingdi Lan (검색결과 2 건)
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        High-throughput Fabrication of Chitosan/Poly(ethylene oxide) Nanofibers by Modified Free Surface Electrospinning

        Adnan Ahmed,Lan Xu,Jing Yin,Mingdi Wang,Fawad Khan,Muhammad Ali 한국섬유공학회 2020 Fibers and polymers Vol.21 No.9

        It is very difficult to electrospin pure chitosan (CS) due to the repulsive forces between its ionic groups producedin the electrospinning process, resulting in the formation of nanofibers by blending CS with other natural or syntheticpolymers for electrospinning. In this research work, a high-throughput fabrication of CS/poly(ethylene oxide) (PEO)nanofibers were obtained using a modified free surface electrospinning (MFSE), which contained a titanium solutionreservoir with thick smooth edges. Effects of the concentrations of acetic acid (AA), CS and PEO on the conductivity andviscosity of spinning solutions as well as the morphology, crystallinity and yield of CS/PEO nanofibers were investigated. And the fabrication mechanism of MFSE was studied by simulating the electric field distribution using Maxwell 3D due tothe importance of electric field distribution in the spinning process. The simulation results of electric field were in keepingwith the experimental data and indicated the MFSE could produce a lot of high-quality CS/PEO nanofibers.

      • KCI등재

        Study on the thermoelectric properties of porous Bi-Te films deposited using thermal evaporation on AAO template

        Shiying Liu,GUOJIAN LI,Mingdi Lan,Yongjun Piao,Yanan Zhang,QIANG WANG 한국물리학회 2020 Current Applied Physics Vol.20 No.3

        The application of thermoelectric films is limited to retain the temperature gradient. In this study, the Bi-Te films are deposited on the AAO template with a pore size of 100 nm using thermal evaporation. The results show that the conductive types of the Bi-Te film are tuned by source temperature. The power factor of the p-type porous film decreases 36% by comparing to that of the p-type nonporous film (1020 μW/mK2 at 250 °C). Meanwhile, the temperature difference in the porous device is maintained and is approximately 5.0 °C. Thus, the maximum output power is achieved in the porous device (about 25 pW), which is 5 times higher than that of the nonporous device. This provides a method to improve the conversion efficiency of thermoelectric film device by maintaining the temperature difference by using porous structure.

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