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Synthesis of N-doped Carbon Spheres Using Extended Stöber Method for SO2 Adsorption
Yunqian Li,Yifeng Yu,Lei Liu,Hongliang Zhang,Guoxu Wang,Aibing Chen 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.1
SO2 is one of the major pollutants in the atmosphere. N-doped microporous carbon spheres (NCS) have been demonstrated to be effective for SO2 adsorption. Here we report the synthesis of monodispersed NCS by the extended Stöber method with urea resorcinol-formaldehyde resins as carbon source, urea as nitrogen source and ammonia as catalyst in an ethanol-water mixed solvent. The obtained carbon spheres show a uniform diameter of around 550 nm, specific surface area of 476 m2 g-1, micropores pore volume of 0.20 cm3 g-1 and nitrogen doping. The NCS manifest special performance for SO2 capture with capability of 75.34 mg g-1 and good cycling stability, due to the large surface area, abundant micropores and nitrogen functionality.
Effects of Surface Energy on the Nonlinear Behaviors of Laminated Nanobeams
Menghua Xu,Baolin Wang,Aibing Yu 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.4 No.1
Using an improved multilayer-beams model, the surface effect caused by surface stress and surface elasticity on mechanical properties of laminated nanobeams in bending, bucking and vibration is incorporated into the nonlinear beam theory. Analytical solutions are obtained to study the influence of surface and interface effects for simply supported boundary conditions. Unlike the deduction of previous beam theory, the theoretical derivation in present work includes the effect of both surface and interface. Numerical cases of double layer and multilayer Nickel-silver laminated beams indicate that the interface effect observably change the elastic behaviour of laminated beams on the nanometer scale, especially for multilayer cases.
Wei Zhang,Huarui Xu,Guisheng Zhu,Aibing Yu 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.4
Tetragonal barium titanate (BaTiO3) powder with a uniform size distribution was successfully prepared by an ion-exchange treatment followed by hydrothermal process, and with a high precursor concentration. Ion-exchange treatment of the bariumtitanium chloride led to the formation of the homogeneous Ba-Ti hydroxide sol. Then, hydrothermal (240 ℃ for 7 h) led to the preparation of BaTiO3 powders with a very narrow size distribution (90 ± 3 nm) and a very high tetragonal content (90%), which were confirmed respectively by scanning electron microscopy and differential scanning calorimetry. Further, using the regenerated resin to ion-exchange, the BaTiO3 yield reached 99%.
Juan Du,Lei Liu,Yifeng Yu,Yue Zhang,Aibing Chen 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.76 No.-
A self-assembly method using ionic liquids as soft-template and nitrogen precursor, resin as carbonprecursor, silica as assistant agent, mesoporous resin spheres as additive, is employed to prepare Ndopedcore–shell mesoporous sphere and carbon sheet composite (N-CMCS/CS). The obtained N-CMCS/CS possesses thin sheet, core–shell spheres, dual-mesoporous structure, large specific area and a certainof N-doping, which endows it with superior electrochemical performance as electrode material insupercapacitor.
Dilip C. D. Nath,Sri Bandyopadhyay,John Rider,Aibing Yu,Darryl Blackburn,Chris White 한국고분자학회 2011 Macromolecular Research Vol.19 No.4
isotactic-Polypropylene (PP) composites reinforced with 20, 45, and 60 wt% fly ash (FA) were prepared by injection molding at 483 K. The thermo-mechanical and morphological behaviors of PP and composites were examined. The addition of FA led to significant enhancement of both storage (E') and loss modulus (E'') of the composites compared to those of PP at a given temperature, supporting the view of the formation of an interfacial interaction between the surfaces of PP and FA. By increasing the temperature from 303 to 423 K, these properties decreased exponentially, and indicated the temperature-activated mobility of segmental chains of PP. The tangent δcurves of PP and composites showed broader patterns. The glass transition temperature (Tg) was assigned at 343 K for PP and 245-246 K for the composites. In the theoretical calculation of the storage modulus and tangent δ, the modifications were required in the existing equations to fit the experimental data well. Scanning electron microscopy (SEM) revealed a uniform distribution of spherical FA particles in the composites. The calculated interfacial interaction between the FA and PP surfaces was 1.85, which is similar with other composite systems.