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Zhenjiang Tan,Minggao Tan,Jiangdong Dai,Wenna Ge,Wenjing Zhu,Yongsheng Yan 한국섬유공학회 2020 Fibers and polymers Vol.21 No.4
Here, novel magnetic imprinted porous foams (MIFs) were prepared by Pickering oil-in-water high internal phaseemulsion polymerization, using renewable cellulose nanocrystals (CNCs) derived from cotton source as the stabilizer, andsurfactant Tween 85 and iron oxide magnetic nanoparticles as additive in aqueous phase, for selective adsorption of 4-nitrophenol (4-NP). Interconnected porous foam structure was formed and optimized by controlling the addition amount ofsolid stabilizer CNCs, Tween 85, and oil phase volume, the optimum value of which was 7.5 wt%, 5.0 wt%, and 85 %,respectively. The as-synthesized imprinted material had the good thermal stability and magnetic responsivity. The adsorptionequilibrium data was fitted well by the Langmuir isothermal model with a maximum adsorption capacity of 287.5 μmol/g. Pseudo-second-order kinetics model could better describe the kinetics data. MIFs showed excellent selective ability for 4-NPas compared with these structural analogues. Besides, Thomas model explained the dynamic breakthrough curves better. Theregeneration ability of MIFs was also satisfying after several reuse.
Zhenjiang He,Yuxi Yang,Peng Bai,Xianghai Guo 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
Selective adsorption and separation of three xylene isomers of seven stable metal-organic frameworks(MOFs) were investigated, where MIL-53(Cr) manifested the highest adsorption capacity and apparentpreference for o-xylene. Further detailed studies with MIL-53(Cr) showed that pseudo-second-ordermodelfit best with adsorption kinetics of xylene isomers, and the isotherms were perfectlyfitted byLangmuir isotherm model. The adsorption was proved to be a quick process, and both the changes ofentropy and enthalpy contributed to the o-xylene selectivity, but which mainly resulted from the entropyeffect. The adsorption capacity of preferable isomer o-xylene, on account of better packing efficiency, wasrecord-breaking 8.19 mmol/g, and selectivity of OX/PX, OX/MX and MX/PX were 13.75, 8.01 and 1.72,respectively. Both the adsorption capacity and OX selectivity on MIL-53(Cr) in liquid phase adsorptionand breakthrough experiments were super high, which discriminated it from zeolites and other materialsreported so far. Combined with extremely short equilibrium time and high stability, MIL-53(Cr) can be apromising adsorbent for separation of xylenes in industrial process.
Molecular dynamics simulation of tensile behavior of diffusion bonded Ni/Al nanowires
Zhenjiang Hu,Junjie Zhang,Yong Da Yan,Jiuchun Yan,Tao Sun,김동철,강성원 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.1
Interfaces play key roles in determining mechanical properties of materials. In current work we perform molecular dynamics simulations of diffusion bonding to evaluate the effect of temperature on the morphology of the Ni/Al interface and the strength of the diffusion bonded Ni/Al nanowires. The centro-symmetry parameter is adopted to identify defect atoms generated. Simulation results show that the thickness of the Ni/Al interface has strong dependence on the temperature of diffusion bonding. Following uniaxial tension tests indicate that the yield strength of Ni/Al nanowires is smaller than both the single crystalline Ni and Al nanowires, because of the Ni/Al interface acting as dislocation source and the mobilization of pre-existing dislocations at high temperature. It is shown that the mechanical properties of diffusion bonded Ni/Al nanowires strongly depend on the temperature.