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Highly Polarized Anatase TiO_2 Nanoparticles by Poly(ethylene phthalate)
채일석,강상욱,홍진기 한국고분자학회 2011 Macromolecular Research Vol.19 No.9
Highly positively polarized anatase TiO_2 nanoparticles were prepared through the strong interactions between a TiO_2 surface and the phthalate oxygens of poly(ethylene phthalate) (PEP) without stabilizers or surfactants. The prepared anatase TiO_2 nanoparticles were monodisperse with a mean diameter of 55 nm, as confirmed by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Surprisingly, X-ray photoelectron spectroscopy (XPS) showed that the prepared anatase TiO_2 nanoparticles stabilized by PEP were more positively polarized than other nanoparticles that had been reported previously.
자동차 배기가스 측정을 위한매연프로브 효율 개선에 관한 연구
채일석,김상유,김재열 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.8
Cars are inspected in the transport sector for their ability to achieve the greenhouse gas reduction targets. A vehicle (automobile) inspection broadly consists of regular and total checks, and both the safety level and the amount of exhaust gas are checked simultaneously during a vehicle inspection. This study deals with the efficiency of a soot probe to measure soot emissions from diesel vehicles. When the vehicle exhaust gas measurement is performed, there may be a difference between the exhaust gas temperature and the soot suction amount because of the different shape and angle of the exhaust port for each vehicle type. This may result in some incidents where the correct inspection nonconforming vehicle is not selected. Therefore, in this study, the shape of the probe was improved to increase the soot measurement efficiency under the condition of the exhaust pipe angle change.
Enhanced Olefin and CO2 Permeance Through Mesopore-Confined Ionic Liquid Membrane
채일석,홍길환,송동훈,강용수,강상욱 한국고분자학회 2019 Macromolecular Research Vol.27 No.3
Nanocomposites of ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate (BmimBF4), in three-dimensional mesoporous silica (KIT-6) were fabricated and utilized as mesopore-confined ionic liquid membranes for Olefin and CO2 Separation. Compared to neat BmimBF4, the fabricated membrane showed 10-timesenhanced gas permeation property for olefin separation, and 5-times-enhanced gas permeation property for CO2 separation with gas-selectivity remaining unchanged. Moreover, the enhanced diffusion-limited current density of the electrochemical cell involving I-/I3 - redox couple in BmimBF4/KIT-6 nanocomposite was observed. This implies that mesoporous KIT-6 can be used as an effective additive in nanocomposite membranes for enhanced olefin and CO2 permeance.
채일석,강상욱 한국고분자학회 2019 Macromolecular Research Vol.27 No.5
We found that membranes consisting of poly(ethylene oxide) (PEO), AgBF4, and Al(NO3)3 exhibit relatively high permeance, i.e., 20 gel permeation unit (GPU) with a mixed-gas selectivity of 10 for propylene/propane separation. To enhance separation, high-molecular-weight PEO was utilized as polymer matrix. As a result, when 9.0×105 g/mol PEO was utilized, the PEO/AgBF4/Al(NO3)3 electrolyte membranes showed permeance of 32 GPU with a selectivity of 11, as well as demonstrating longterm stability. It was found that longer polymer chains could enable extensive segmental motions that enhance olefin diffusion, thereby improving gas performance. Furthermore, the more viscous aqueous solution of high-molecular-weight PEO enabled the formation of a thinner layer, thus improving the mix-gas permeance of the membrane, using the same conditions as low-molecular-weight PEOs. The coordination interactions of metal ions and ether moieties in the same electrolyte membrane were investigated by FT-IR and X-ray photoelectron spectroscopy.