• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1997년도 추계학술대회 논문집
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• pp.497-500
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• 1997

Conducting polymer is new material in lithium secondary battery. conducting polymer has a lot of merit which is flexible and good handing so that this material is used battery system, solid polymer electrolytes airs used PEO(Polyethylene oxide) and PEO/PMMA branding material adding by liquid plasticizer or lithium salt polymer electrolyte which is added liquid plasticizer, lithium salt decreased the crystallity and thermal stability is over than 13$0^{\circ}C$. it is very useful tn apply lithium secondary battery system.

• Environmental Engineering Research
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• 제14권1호
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• pp.41-47
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• 2009

Column experiments were performed in this study to investigate humic acid adhesion to iron oxide-coated sand (ICS) under different experimental conditions including influent humic acid concentration, flow rate, solution pH, and ionic strength/composition. Breakthrough curves of humic acid were obtained by monitoring effluents, and then column capacity for humic acid adsorption ($C_cap$), total adsorption percent (R), and mass of humic acid adsorbed per unit mass of filter media ($q_a$) were quantified from these curves. Results showed that humic acid adhesion was about seven times higher in ICS than in quartz sand at given experimental conditions. This indicates that humic acid removal can be enhanced through the surface charge modification of quartz sand with iron oxide coating. The adhesion of humic acid in ICS was influenced by influent humic acid concentration. $C_cap$ and $q_a$ increased while R decreased with increasing influent humic acid concentration in ICS column. However, the influence of flow rate was not eminent in our experimental conditions. The humic acid adhesion was enhanced with increasing salt concentration of solution. $C_cap$, $q_a$ and R increased in ICS column with increasing salt concentration. On the adhesion of humic acid, the impact of CaCl2 was greater than that of NaCl. Also, the humic acid adhesion to ICS decreased with increasing solution pH. $C_cap$, $q_a$ and R decreased with increasing solution pH. This study demonstrates that humic acid concentration, salt concentration/composition, and solution pH should be controlled carefully in order to improve the ICS column performance for humic acid removal from water.

• Nuclear Engineering and Technology
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• 제48권4호
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• pp.997-1001
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• 2016

Conductive ceramics are being developed to replace current Pt anodes in the electrolytic reduction of spent oxide fuels in pyroprocessing. While several conductive ceramics have shown promising electrochemical properties in small-scale experiments, their long-term stabilities have not yet been investigated. In this study, the chemical stability of conductive $La_{0.33}Sr_{0.67}MnO_3$ in $LiCl-Li_2O$ molten salt at $650^{\circ}C$ was investigated to examine its feasibility as an anode material. Dissolution of Sr at the anode surface led to structural collapse, thereby indicating that the lifetime of the $La_{0.33}Sr_{0.67}MnO_3$ anode is limited. The dissolution rate of Sr is likely to be influenced by the local environment around Sr in the perovskite framework.

• Journal of Pharmaceutical Investigation
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• 제36권3호
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• pp.169-174
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• 2006

The aim of this work was to prepare tenoxicam-ethanolamine salt with improved physicochemical properties for transdermal application. Tenoxicam-ethanolamine salt was prepared in methylene chloride and its physicochemical properties were investigated by DSC and FT-lR. The broad peak of tenoxicam around 3600-3200 $cm^-1$ was shifted to lower wavenumber and more broadened. The characteristic endothermic melting peak of tenoxicam appeared at $223^{\circ}C$. The melting peak of tenoxicam-ethanolamine salt was shifted to $159^{\circ}C$. In contrast to relatively small difference in the partition coefficients of tenoxicam and the tenoxicam-ethanolamine salt, large difference in aqueous solubility was observed. $Crovol^{\circledR}$ PK4O (PEG-12 palm kernel glycerides) provided the highest skin flux for both compounds. The order of the enhancing effect of the various vehicles tested was similar for tenoxicam and tenoxicam-ethanolamine salt, which indicated that their enhancing mechanism for tenoxicam and tenoxicam-ethanolamine salt is similar. Tenoxicam-ethanolamine salt had a higher skin flux than tenoxicam by 1.2- to 31.7-fold, depending on the vehicles used. It is suggested that the vehicles with medium HLB value, 1 double bond, and lower ethylene oxide chain length have a better ability to modify the permeability of the stratum corneum and to promote the effective penetration of tenoxicam and tenoxicam-ethanolamine salt.

• 한국산학기술학회논문지
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• 제22권3호
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• pp.492-498
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• 2021

본 논문에서는 액체 소금물을 전도체로써 이용한 평면형 투명 안테나의 구현 가능성을 연구 하였다. 소금물을 이용한 투명 안테나 구현의 가장 큰 이유는 기존 고체 투명전극의 광투과도 indium tin oxide (ITO:> 73%) 또는 multi-layer films (MLF: > 78%) 대비 높은 소금물의 광투과도 (> 95% @ 40 ppt)에 있다. 제안된 다이폴안테나의 양쪽 팔의 소금물 층을 평면형으로 고정하기 위해 투명 아크릴(��r = 2.61, tan�� = 0.01, OTav > 90 %)을 사용하였으며, 소금물의 표면장력을 이용하여 (ASA: 아크릴/소금물/아크릴) 형태의 평면형 ASA층으로 구현 하였다. 전기적, 광학적으로 ASA 전도체 구조를 분석하기 위해, 표면장력을 통한 평면형 구조 유지 시, 소금물 두께에 따른 면저항과 광투과도를 분석 하였다. 소금물을 이용한 투명 평면형 다이폴 안테나는 UHF(Ultra high frequency) 대역(470-771 MHz)에서 1.72 dBi의 평균 방사이득 및 74 %의 방사효율을 가지며, 향후 소금물을 이용한 평면형 투명안테나로써의 활용 가능성을 확인 하였다.

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2004년도 학술논문집
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• pp.268-277
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• 2004

사용후핵연료 차세대 관리공정의 주된 단위 공정인 전기 환원에 의한 금속 전환 공정에서의 핵종 거동 및 분포에 관한 기초 연구의 일환으로 고방열성 핵종인 알카리, 알카리토 금속 산화물들의 고온 용융염에서의 전기 화학적 특성을 측정 분석함으로서 전기 환원 공정에서의 거동을 예상하였다. LiCl-$Li_2O$ 용융염계에서 Cs, Sr 및 Ba은 Li 보다 높은 진위에서 환원되며 환원 전위는 서로 근접해 있는 것으로 측정되었다. 이에 따라 사용후핵연료의 전기 환원 과정에 Li 환원을 매개로 한 반응 메카니즘에 저해를 일으키지 않을 것으로 예측되었다. 알카리, 알카리토 금속의 환원조건에서 공정이 운전될 경우 자유에너지 변화의 계산을 통해 알자리, 알카리토 금속이 용융염으로 재순환됨을 확인 하였으며 전류 범위에 따른 금속 원소의 농도 변화를 측정하여 알카리, 알카리토 금속의 물질 전달에 대한 전류의 영향을 평가하였다.

• Bulletin of the Korean Chemical Society
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• 제28권6호
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• pp.1060-1062
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• 2007

• Carbon letters
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• 제16권1호
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• pp.41-44
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• 2015

We report the preparation of sulfonated reduced graphene oxide (SRGO) by the sulfonation of graphene oxide followed by radiation-induced chemical reduction. Graphene oxide prepared by the well-known modified Hummer's method was sulfonated with the aryl diazonium salt of sulfanilic acid. Sulfonated graphene oxide (SGO) dispersed in ethanol was subsequently reduced by ${\gamma}$-ray irradiation at various absorbed doses to produce SRGO. The results of optical, chemical, and thermal analyses revealed that SRGO was successfully prepared by ${\gamma}$-ray irradiation-induced chemical reduction of the SGO suspension. Moreover, the electrical conductivity of SRGO was increased up to 2.94 S/cm with an increase of the absorbed dose.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 춘계학술대회 논문집
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• pp.392-394
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• 2009

Direct Carbon Fuel Cells (DCFCs) generates electricity directly converting the chemical energy in coal. In the present study, effects of anode and current collector materials on the power density of DCFC are investigated experimentally. The adopted DCFC system is combined type of solid oxide fuel cells (SOFC) and molten carbonate fuel cells (MCFC) with the use of a liquid-molten salt anode and a solid oxide electrolyte, proposed by SRI. Power densities of 25 mm button cells with various combination of anode materials and current collector materials are measured.

• 한국분말재료학회지
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• 제10권2호
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• pp.136-141
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• 2003

In the present study, $TiO_2$ imbedded copper matrix powders have been successfully prepared from the ($CuSO_4+TiO_2+Zn$) composite salt solution. The composite $Cu/TiO_2$ powders were formed by drying the solution at $200{\sim}~400^{\circ}C$ in the hydrogen atmosphere. Photocatalytic characteristics was evaluated by detecting TOC (total organic carbon) amount with TOC analyzer (model 5000A Shimadzu Co). Phase analysis of $Cu/TiO_2$ composite powders was carried out by XRD, DSC and powder size was measured with TEM. The mean particle size of composite powders was about 100 nm and a few zinc and copper oxide phases was included. The reduction ratio of TOC amount was 60% by the composite $Cu/TiO_2$ powders under the UV irradiation for 8 hours.