• 대한화학회지
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• 제25권5호
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• pp.311-317
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• 1981

새로운 니켈(II) 화합물, 비스(트리메틸실릴메틸)1,2-(비스디페닐포스피노) 에탄니켈(II)(1)이 디클로로-1,2-비스(디페닐포스피노)에탄니켈(Ⅱ)와 트리메틸실릴메틸리튬의 반응으로부터 합성되었다. 화합물 1은 질소하, 상온에서 안정하다. 화합물 1은 열분해하여 환원성짝지음 생성물, 1,2-비스(트리메틸실릴)에탄을 생성한다. 화합물 1은 상온에서 일산화탄소 및 산소와, 그리고 80${\circ}$C에서 1,2-비스(디페닐포스피노)에탄과 반응하여 역시 1,2-비스(트리메틸실릴)에탄을 생성한다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 영호남학술대회 논문집
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• pp.124-127
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• 2000

The purpose of this study is to research and develop PAn-Carbon composite electrode for Supercapacitor. Supercapacitor cell of PAn-Carbon composite electrode with 1M $LiClO_{4}/IPC$ brings out good capacitor performance below 4.0V. The radius of semicircle of PAn-Carbon composite electrode adding 30wt% Acetylene Black was absolutely small. The total resistance of Supercapacitor cell mainly depended on internal resistance of he electrode. The discharge capacitance of PAn-Carbon on composite with 30wt% Acetylene Black in 1st and 50th cycles was 29 and 31F/g at current density of $1mA/cm^2$. The capacitance of PAn-Carbon composite with 30wt% Acetylene Black capacitor was larger than that of PAn capacitor without Acetylene Black. The coulombic efficiency of supercapacitor at discharge process of 1 and 50 cycles were 94 and 100%. respectively. PAn-Carbon composite Supercapacitor with 30wt.% Acetylene Black content showed good capacitance and stability with cycling.

• 한국수소및신에너지학회논문집
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• 제24권2호
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• pp.179-185
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• 2013

The behavior of surface film formation was greatly dependent on the speed of potential cycling. In $LiClO_4$ / EC + DEC, cyclic voltammetry results showed that the peaks originated from surface film formation on graphite electrode at the high charge-discharge rate was shifted to the lower potentials as the charge-discharge rate decrease. This indicates that surface films with different morphology and thickness were formed by different charge-discharge rate. Transmission electron microscopy (TEM) results indicated that the properties such as thickness and morphology of the surface film were greatly affected by the charge-discharge rate. Electrochemical impedance spectroscopy (EIS) showed that the resistance of surface film was affected by the speed of potential cycling. In addition, the charge transfer resistance was also dependent on the charge-discharge rate indicating that the charge transfer reaction was affected by the nature of surface film. TEM and EIS results suggested that the chemical property as well as the physical property of the surface film was affected by the charge-discharge rate.

• 한국재료학회지
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• 제12권4호
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• pp.283-289
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• 2002

The E.M.F of the galvanic cell with fused salt was measured to determine the activities of zinc at 700-820K over the entire composition range of liquid Zn-Cd alloys. The cell used was as follows: (-) W ｜ Zn(pure) $Zn^{2+}(KCI-LiCl)$ ｜ Zn(in Zn-Cd alloy) ｜ W (+) The activities of zinc in the alloys showed positive deviation from Raoult's law over the entire composition range. The activity of cadmium and some thermodynamic functions such as Gibbs free energy, enthalpy, entropy were derived from the results by the thermodynamic relationship. The comparison of the results and the literature data was made. The liquid Zn-Cd alloy is found to be close to the regular solution. The concentration fluctuations in long wavelength limit, $S_{cc}(o)$, in the liquid alloy was calculated from the results.

• Journal of Information Display
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• 제11권2호
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• pp.84-90
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• 2010

This paper presents the effects of a dielectric layer and an electrolyte on the driving performance of an electrowetting on dielectric (EWOD)-based liquid lens. The range of tunable focal length of the EWOD-based liquid lens was highly dependent on the conditions of the dielectric layer, which included an inorganic oxide layer and an organic hydrophobic layer. Moreover, experiments on the physical and optical durability of electrolyte by varying temperature conditions, were conducted and their results were discussed. Finally, the lens with a truncated-pyramid silicon cavity having a sidewall dielectrics and electrode was fabricated by anisotropic etching and other micro-electromechanical systems (MEMS) technologies in order to demonstrate its performance. The lens with $0.6-{\mu}m$-thick $SiO_2$ layer and 10 wt% LiCl-electrolyte exhibited brilliant focal-length tunability from infinity to 3.19 mm.

• Advances in materials Research
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• 제1권1호
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• pp.1-12
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• 2012

There have been many efforts on the generating metal nanocrystals enclosed by high-index facets for the use as highly active catalysts. This paper describes a facile synthesis of Au trisoctahedra with high-index facets. In brief, the Au trisoctahdra were prepared by reduction of $HAuCl_4$ in N,N-dimethylformamide (DMF) containing poly (vinyl pyrrolidone) (PVP) and trace amount of $AgNO_3$. The Ag ions in the reaction solution played a critical role in controlling the trisoctahedral shape of the final product by underpotential deposition (UPD) on the Au surfaces. The as-prepared Au trisoctahedra were single crystal and enclosed by high-index {441}, {773} and {331} facets.

• Bulletin of the Korean Chemical Society
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• 제33권12호
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• pp.4015-4022
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• 2012

Manganese(III) 5-(4-carboxyphenyl)-10,15,20-triphenyl porphyrin chloride (Mn(TCPP)Cl) was grafted through amide bond on silica zeolite Y (HY), zeolite beta ($H{\beta}$) and hexagonal mesoporous silica (HMS). XRD, ICP-AES, $N_2$ physisorption, SEM, TEM, FTIR and thermal analysis were employed to analyse these novel heterogeneous materials. These silica supported catalysts were shown to be used for epoxidation and good shape selectivity was observed. The effect of support structure on catalytic performance was also discussed. The catalytic activity remained when the catalysts were recycled five times. The energy changes about epoxidation of alkenes by $NaIO_4$ and $H_2O_2$ were also computationally calculated to explain the different catalytic efficiency.

• Bulletin of the Korean Chemical Society
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• 제14권1호
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• pp.123-127
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• 1993

New lipophilic Crown-4 compounds of 16-membered rings containing furan (neutral carrier,I), tetrahydrofuran (neutral carrier,II) and lithium complex of the latter (neutral carrier,III) have been synthesized and tested as the active sensors for lithium ion in poly(vinyl chloride) (PVC) membrane electrode, in the presence and absence of an anion excluder, tetrakis(4-chloro-phenyl)borate (KTClPB), 2-nitrophenyl phenyl ether (NPPE), tris(2-ethylhexyl)phosphate (TEHP), o-nitrophenyl octyl ether (NPOE), dioctyl adipate (DOA), bis(2-ethylhexyl)adipate (BEHA), di-n-octylphenyl phosphonate (DOPP) were used as plasticizing solvent mediators. The electrode response function had a nearly Nernstian slope of 54-61 mV per decade (25$^{\circ}$C) within the concentration range of $10^{-1}-10^{-4}$ M LiCl and the detection limits for all electrodes were ca. $5{\times}10^{-4}$ M. The response time of the electrode was faster at the higher lithium concentration and the response of the electrode was stable for longer than 6 months. The sensor membranes exhibit improved response times and increased lifetimes as compared to the system described earlier.

• Journal of Acupuncture Research
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• 제22권1호
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• pp.61-75
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• 2005

동충하초(冬蟲夏草)가 신장(腎臟)기능에 미치는 영향을 실험적으로 규명하고자 부분 신절제술을 시행한 백서(白鼠)에 대하여 동충하초(冬蟲夏草) 경구투여(經口投與)와 신유(腎兪) 태계(太谿)에 약침(藥鍼)을 시행한 후 신장내(腎臟內) aquaporin -2 단백발현과 혈장내 renin, ANP, aldosterone 등의 혈액 학적 변화 및 뇨중 creatinine, Na, K Cl 를 관찰하여 다음과 같은 결과를 얻었다. 1. AQP2단백 발현은 경구투여(經口投與) 1, 3군, 약침(藥鍼) 1군에서 유의한 증가를 나타내었다. 2. 혈장 renin은 경구투여(經口投與) 1, 2, 3군, 약침(藥鍼) 1, 2, 3 군 모두에서 유의한 감소를 나타내었다. 3. 혈장 ANP는 경구투여(經口投與) 1군, 약침(藥鍼 ) 3군에서 유의한 증가를 나타내었다. 4. 혈장 aldosterone은 경구투여(經口投與) 2, 3군, 약침(藥鍼) 2군에서 유의한 감소를 나타내었다. 5. 혈청 triglyceride는 경구투여(經口投與) 2, 3군, 약침(藥鍼) 2, 3군에서 유의한 감소를 나타내었다. 6. 혈청 albumin은 경구투여(經口投與) 2군, 약침(藥鍼) 3군에서 유의한 증가를 나타내었다. 7. 혈청 total protein, BUN은 경구투여(經口投與) 1, 2, 3 군, 약침(藥鍼) 1, 2, 3군 모두에서 유의한 감소를 나타내었다. 8. 혈청 phosphorus는 경구투여(經口投與) 1, 2, 3군, 약침(藥鍼) 1, 2군에서 유의한 감소를 나타내었다. 9. 뇨(尿) creatinine은 경구투여(經口投與) 2군에서 유의한 증가를 나타내었고, 약침(藥鍼)군에서는 유의한 변화가 관찰되지 않았다. 10. 뇨(尿) Na는 경구투여(經口投與 ) 1, 2군, 약침(藥鍼) 1, 2, 3군에서 유의한 증가를 나타내었다. 11. 뇨 K는 경구투여(經口投與) 1, 3군에서 유의한 감소를 나타내었으나, 약침(藥鍼) 3군에서는 유의한 증가를 나타내었다. 12. 뇨 Cl는 경구투여(經口投與) 3군, 약침(藥鍼) 2, 3군에서 유의한 증가를 나타내었다.

• 한국식품영양과학회지
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• 제43권8호
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• pp.1248-1256
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• 2014

자죽염(purple bamboo salt; PBS)을 제조하는 공정에 영향을 미치는 원염(갯벌천일염, MSS; 죽염, BS)의 종류, 대나무 첨가에 따른 BS의 이화학적 특성, 황 화합물, 미네랄 함량 및 환원력을 비교 분석하고, 이를 통해 PBS에 함유된 $SO_2$와 산화환원전위(ORP)의 발생 원인을 분석하였다. BS를 고온에서 용융시켜 제조한 PBS에서 630 ppm의 $SO_2$가 검출되었다. PBS의 원료 염과 RB에서는 $SO_2$가 검출되지 않았으나, 염화물, 황산염류, 탄산염류와 대나무(RB)를 함께 탄화시켜 $SO_2$ 검출 원인을 확인한 결과 황산칼륨에 의해 782 ppm이 발생하였다. BS의 $SO_2$는 BSRB1(13.88)~BSRB4(109.13 ppm)에서만 발생하였고 $SO{_3}{^{2-}}$는 MSSRB4와 BSRB2~BSRB4에서만 발생하였으며, 시간이 경과함에 따라 증가되는 경향을 나타내었다. $SO_4{^{2-}}$는 시간이 지남에 따라 감소하는 경향을 나타내었으며 $SO_2$와 $SO_3{^{2-}}$가 많을수록 낮은 함량을 나타내었다. ORP는 모두 시간이 지남에 따라 증가하는 경향을 나타내었고 BS에서 더 높은 수준을 나타내었으며, BSRB4(-211.40 mV)에서 가장 높은 환원력을 나타내었다. 일반적 특성 중 불용분은 BS에서 더 높았으며 RB가 탄화되어 남은 물질들이 영향을 미친 것으로 판단된다. Ca, K, Mg의 경우 굽는 시간 경과에 따라 MSS는 감소, BS는 증가하는 경향을 나타내었다. BSRB4의 Ca는 1.4배, Mg는 1.5배 증가하였고 K 함량은 1.8배 더 높은 것으로 나타났다. 미량 미네랄은 굽는 시간 경과에 따라 MSS에서 Li, Al, Mn, Fe, Sr이 증가되었고, BS에서 Al, Fe, Ni가 증가하였다. 음이온(Cl, $NO_3$, Br)과 중금속(Pb, Cd, Hg, As)은 각 요인에 대한 영향을 받지 않았다. 결론적으로 BS의 기능성을 나타내는 환원력은 $SO_2$ 및 $SO_3{^{2-}}$와 같은 저분자 황화합물에 의한 것이며, 이는 한 번 굽는 과정을 거친 BS를 사용하고 이에 RB를 첨가하여 고온에서 용융하는 시간이 길수록 이들 황화물질이 많아져 환원력이 증가된다는 것을 의미하는 것이다.