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Chaonan Wang,Junhong Zhao,Shengyun Luo,Xu Yu 한국고분자학회 2021 Macromolecular Research Vol.29 No.9
Steam-assistant nitrogen (N) and phosphorus (P) co-doping of graphene (s-NPG) architectures are constructed by a facile chemical converted method and thermal activation. Steam-activation treatment can provide abundant porous structure for fast ion diffusion and expose more electrochemical active-sites for surface faradic reaction. The wrinkled surface of S-NPG with a large surface area is probed by microscopic analysis. The spectroscopic analysis confirms the existence of pyridinic- N and C-P-O bonds for s-NPG, which are the dominant electroactive sites for accommodating the protons or charges. Therefore, s-NPG exhibits a high specific capacitance of 317 F g-1 at 1 A g-1 with a good rate capability of 87% and cyclic stability of 97.7% after 20,000 cycles. The excellent pseudocapacitive behavior can be attributed to the synergistic effect of hierarchical structure with and surface modification by N and P dual-doping. The simple steam-assistant treatment can be a potential way to construct the hierarchically structured electrode materials for supercapacitors.
이영덕(Young Duk Lee),이상민(Sang Min Lee),박준홍(Junhong Park),유상석(Sangseok Yu),안국영(Kook Young Ahn) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Future power plants will be required to adopt some type of carbon capture and storage (CCS) technologies to reduce their CO2 emissions. One of distinguished CCS techniques expected to resolve the green house effect is to apply the oxy-fuel combustion technique to power plant, and a lot of research/demonstration programs have been going on in the world. In this paper, CO2-capturing power plants based on gas turbine and oxy-fuel combustion are investigated over several types of configurations. As a prior step, simulation model for 500 ㎹-class combined cycle power plant was set and was used as a reference case. The efficiencies of several power plants was compared and the advantages and disadvanteges was investigated.
Xin Zhang,Minghao Fan,Yongkai Yuan,Jianjun Dong,Hua Yin,Yang He,Lei Mao,Dongfeng Wang,Junhong Yu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-
Fucoxanthin (FX) is a carotenoid with antioxidant, anti-obesity, anti-diabetic, anti-cancer and antibacterialactivities. It is poorly water soluble and highly sensitive to light, heat and the surrounding environment. Therefore, how to effectively encapsulate it and stabilize it for entry into the human body hasbecome a key research question at present. This study developed a single-carrier to encapsulate FX andshowed excellent characterization results. The experimental results showed that the diameters of FX-ZHparticles prepared by the four encapsulation processes ranged from 143.83 to 216.93 nm. Comparison ofantioxidant activity and stability to temperature and pH of the four complexes showed significant differences,with the best performance of the nanoparticles prepared using water-soluble method and a slowspeedstirrer. The nanocomplexes were proved to be more stable and more bioavailable, with a significant34.41% increase in FX content relative to free FX in the intestinal phase. Inhibition of human leukaemiacells HL-60 cells remained high, with 11.14% ± 6.03% inhibition at FX concentrations of 1 lg/mL. Thisstudy encapsulated FX based on colloidal nanoparticle systems for the first time using a single-carriermaterial, an innovation and breakthrough that could simplify the experimental steps and provide thenecessary basis for industrial realization.