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고온작동 수퍼커패시터용 이온성 액체 전해질에서의 흄드 실리카의 효과
김동원,정현영,Kim, Dong Won,Jung, Hyunyoung 한국재료학회 2018 한국재료학회지 Vol.28 No.1
The demand for energy storage devices capable of operating at high temperatures is increasing. In order to operate at high temperatures, a device must have excellent thermal stability and no risk of explosion. Ionic liquids are electrolytes that satisfy the above conditions, and studies on improving their performance have attracted great interest. Here, we report the results of a study on the fabrication of a supercapacitor that has a composite electrolyte prepared by dispersing fumed silica in an ionic liquid. The fumed silica filler exhibits improved ionic conductivity and lower interfacial resistance. In particular, the silica nanoparticles with diameters of 10 nm exhibit better electrochemical properties than fillers of other diameters and have excellent device performance of 33 times higher than the pristine ionic liquid at high temperatures. This study can be used to improve the electrolytes of electrochemical devices, such as the next generation battery or lithium ion battery.
김동원,김성신,박재옥,이도상,Kim, Dong Won,Kim, Seung Sin,Park, Jae Ock,Lee, Do Sang 대한소아소화기영양학회 2004 Pediatric gastroenterology, hepatology & nutrition Vol.7 No.1
저자들은 생후 22시간만에 보챔, 복부 팽만 등의 복막염 증세가 나타난 신생아에서 단순 복부 방사선 소견에서 기복을 확인하고 응급 수술을 시행하여 태생기에 발생한 멕켈 게실 천공으로 진단된 신생아 1례를 경험하였기에 문헌 고찰과 함께 보고하는 바이다. Meckel's diverticulum is the most common malformation of gastrointestinal tract. Symptoms of Meckel's diverticulum usually arise within 2 years of life. The most common presentations include hemorrhage, perforation, diverticulitis and intestinal obstruction. Perforation of the Meckel's diverticulum in a neonate is uncommon but life threatening condition. We describe the first case of perforation of Meckel's diverticulum in a 1-day-old neonate who presented with abdominal distension without hemorrhage.
Enrichment of Magnesium Isotopes by Monoazacrown Bonded Merrifield Peptide Resin.
김동원,Kim, Dong Won Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.6
Magnesium isotope separation was investigated by chemical ion exchange with the 1-aza-12-crown-4 bonded Merrifield peptide resin using an elution chromatographic technique. The capacity of the novel azacrown ion exchanger was 1.0 meq/g dry resin. The heavier isotopes of magnesium were enriched in the resin phase, while the lighter isotopes were enriched in the solution phase. The single stage separation factor was determined according to the method of Glueckauf from the elution curve and isotopic assys. The separation factors of $^{24}Mg^{2+}$-$^{25}Mg^{2+}$, $^{24}Mg^{2+}$-$^{26}Mg^{2+}$, and $^{25}Mg^{2+}$-$^{26}Mg^{2+}$ were 1.008, 1.019, and 1.006, respectively.
Chromatographic Enrichment of Lithium Isotopes by Hydrous Manganese(IV) Oxide
김동원,Kim, Dong Won Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.5
Separation of lithium isotopes was investigated by chemical ion exchange with a hydrous manganese(IV) oxide ion exchanger using an elution chromatography. The capacity of manganese(IV) oxide ion exchanger was 0.5 meq/g. One molar CH3COO Na solution was used as an eluent. The heavier isotope of lithium was enriched in the solution phase, while the lighter isotope was enriched in the ion exchanger phase. The separation factor was calculated according to the method of Glueckauf from the elution curve and isotopic assays. The single stage separation factor of lithium isotope pair fractionation was 1.021.
김동원,장영헌,김창석,이남수,Kim, Dong Won,Jang, Yeong Heon,Kim, Chang Seok,Lee, Nam Su Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.7
To test the metal ion effect, hydrolysis experiments for two cellobiohydrolases (CBHⅠ and CBH Ⅱ) from Trichoderma reesei have been carried out in the presence of 10 mM metal ions, such as Cu++, Mn++, Ca++, Hg++, Ba++, Pb++, and Cd++. The addition of Mn++, Ba++, and Ca++(10 mM) during the hydrolysis of Avicel PH 101 caused an increase in the total reducing sugar (TRS) for CBH Ⅰ by 142, 135, and 114 percent, respectively. Those for CBH Ⅱ increased by 177, 175, and 115 percent, respectively. The Mn++ was the most stimulatory metal ion, whereas Hg++ was the most inhibitory metal ion. The adsorption experiments were performed to investigate how the influence of Mn++ and Hg++ on the hydrolysis is related to the adsorption of cellobiohydrolases on cellulose. The increase in TRS during hydrolysis by adding Mn++ caused an increase in adsorption affinity (Kad) and tightness (ΔHa). While, the decrease of TRS during hydrolysis by adding Hg++ caused a decrease in the adsorption affinity (Kad) and tightness (ΔHa). These results indicate the changes in the tightness and affinity of adsorption by adding metal ions play a crucial role in the degradation of the microcrystalline cellulose.