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- 저자 : Yongchun Dong (검색결과 3 건)
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Simulation of Jet Motion during Electrospinning Process through Coupled Multiphysics Method
Yuansheng Zheng,Yongchun Zeng,Xuan Dong 한국섬유공학회 2019 Fibers and polymers Vol.20 No.1
A multiphysics model, used for predicting jet velocity by solving incompressible Navier-Stokes equations coupled with electric volume force, has been developed to simulate the three-dimensional polymer jet produced during electrospinning process. By varying the parameter values in the model, the effects of parameters, including flow rate and viscosity of polymer solution, spinneret diameter, and applied voltage on jet velocity are discussed. This model is validated by comparing with experimental results.
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Fu Li,Yongchun Dong,Weimin Kang,Bo-wen Cheng,Xiang Qu,Guixin Cui 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.12
Two transition metal ions (Fe3+ and Cu2+) and a rare earth metal ion (Ce3+) were selected to coordinate with amidoximated polyacrylonitrile (PAN) nanofibrous membrane for preparing three metal modified PAN nanofibrous membrane complexes (M-AO-n-PANs, M = Fe, Cu, or Ce) as the heterogeneous Fenton catalysts for the dye degradation in water under visible irradiation. The coordination kinetics of three metal ions with modified PAN nanofibrous membranes was studied and the catalytic properties of the resulting complexes were also compared. The results indicated that increasing metal ion concentrations in solution or higher coordination temperature led to a significant increase in metal content, particularly in Fe and Cu contents of the complexes. Their coordination process could be described using Langmuir isotherm and pseudo-second-order kinetic equations. Moreover, Fe-AO-n-PAN had the best photocatalytic efficiency for the dye degradation in acidic medium, but a lower photocatalytic activity than Cu-AO-n-PAN in alkali medium.
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Fu Li,Pengfei Fei,Yongchun Dong,Man Zhang,Yu Feng,Shuqiang Liu,Lu Jia,Hulin Zhang,Zhen Ni 한국섬유공학회 2022 Fibers and polymers Vol.23 No.5
To balance the specific surface area and porous structure of nanofibrous heterogeneous Fenton catalyst for therapid transfer of dye molecules during dye-containing wastewater treatment, a polyacrylonitrile nanofiber with bimodaldiameter distribution (n-PAN-D) was prepared and amidoximated, followed by coordinating with Fe3+ ion (Fe-AO-n-PAND). The modification and coordination process hardly changed the fiber morphology and bimodal diameter distribution ofnanofiber membrane. The amidoximated degree of n-PAN-D increased with the increase of the diameter difference, and thecoordination ability of amidoximated n-PAN-D decreased with increasing the diameter difference. Fe-AO-n-PAN-D hadbetter catalytic activity than those with similar thick or thin nanofiber diameters due to the rapid mass transfer of dyemolecules in the catalyst. The possible oxidation and degradation pathway of Reactive Red 195 in the Fe-AO-n-PAN-D/H2O2system was proposed. And the series of reactions may not gradually occur because of the non-selective oxidation of ·OH. Thegood reusability of Fe-AO-n-PAN-D made it potential carrier for heterogeneous Fenton catalyst in wastewater treatment.
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