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Jung, Min-Jung,Jeong, Euigyung,Lee, Sang Ick,Lee, Young-Seak Elsevier 2012 Journal of industrial and engineering chemistry Vol.18 No.2
<P><B>Abstracts</B></P><P>To improve the electrochemical performance of an activated carbon (AC)-based electric double-layer capacitor (EDLC), the AC surface, which is used as an electrode, was modified using physicochemical base tuning that uses different concentrations of ammonium hydroxide. The effect of the treatment on the surface and electrochemical properties of the AC electrodes was investigated. The specific capacitance of a 13vol%-solution-treated sample was increased to 385F/g at a scan rate of 5mV/s, which was 17% higher than the value of 328F/g obtained for the untreated samples. This increase can be attributed to an increase in the mesopore volume ratio due to the etching effect of the reaction between the carbon surfaces and ammonium hydroxide. Moreover, nitrogen functional groups, which were introduced by the treatment, also improved the electrochemical properties of the resulting AC-based electrode. Therefore, a simultaneous etching and nitrogen-introducing method with ammonium hydroxide can easily introduce nitrogen functional groups on the surface of an AC electrode. This method is very effective for preparing AC for use in an EDLC with improved electrochemical properties.</P>
상태방정식을 이용한 디클로로메탄/이산화탄소 혼합 용매의 열역학적 거동 연구
권웅,이권윤,정의경,Kwon, Woong,Lee, Kwonyun,Jeong, Euigyung 한국섬유공학회 2022 한국섬유공학회지 Vol.59 No.5
Single- or multi-component supercritical fluids, which exhibit excellent solubility in polymers, are used as solvents in polymer-based industries. Because their properties change easily with volume, temperature, and pressure, the use of single- or multi-component supercritical fluids in industrial applications requires the supercritical fluid apparatus to be designed according to the required volume, temperature, and pressure. Supercritical fluid apparatus design and optimization can benefit greatly from the analysis and understanding of the thermodynamic behavior of single- or multi-component fluids. Therefore, this study investigated the correlation between the composition ratio of a dichloromethane/carbon dioxide mixture and pressure at 200 ℃ using ideal gas, van der Waals, Redlich-Kwong, Soave-Redlich-Kwong, and Peng-Robinson equations of state. The critical temperature according to the compositional change of the dichloromethane/carbon dioxide mixture was predicted by the basic mixing rule. This analysis of the thermodynamic behavior of the dichloromethane/carbon dioxide mixture can be used for optimizing supercritical fluid apparatuses.