• EDISON SW 활용 경진대회 논문집
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• 제3회(2014년)
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• pp.197-209
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• 2014

환경 오염에 대한 우려의 목소리가 높아지면서 Green chemistry 분야가 각광을 받고 있다. 이 분야에서는 환경에 영향을 적게 미치기 위한 방법의 일환으로 촉매를 연구하며, 그 촉매는 착화합물인 경우가 많다. 그러나 착화합물 내에서 리간드와 금속 이온간의 결합은 예측하기 어렵다. 이는 전형금속보다는 전이금속에서 더욱 심하며, 그 중 한 예로 전이금속에서는 여러 개의 금속 이온이 서로 직접적으로 결합한 채 리간드와 결합하는 착화합물이 발견되기도 한다. 다중 금속 착화합물(Multimetal Complex)로 부르는 이러한 구조는 특유의 복잡함 때문에 잘 알려져 있지 않음에도 불구하고 착화합물의 물리적, 화학적 성질에 직접적으로 영향을 주기에 촉매나 센서, 특히 이를 이용하여 구조체를 만드는 MOF(Metal-Organic Framework) 분야에서는 꼭 알고 있어야 하는 사항이다. 이 연구에서는 GAMESS로 density functional theory (B3LYP functional)를 이용한 양자계산을 수행하여 그 중 가장 간단한 구조인 Dimetal Complex, 그 중에서도 MOF 내에서 많이 발견되는 수차 형태(Paddle wheel) 착화합물에 대해서 다루었다. Cu를 기준으로 그와 비슷한 주기나 족에 있는 Ru, Ag, Zn 등의 금속으로 만든 Paddle wheel 구조의 에너지를 비교하여 Cu가 다른 금속에 비해 이 구조를 안정하게 형성할 수 있는 이유를 알아보았다. 더 나아가 이 구조가 MOF의 형성과 성질에 어떠한 연관성이 있는지 분석함으로써 어떠한 조건이 MOF의 성질을 극대화시킬 수 있는지도 알아보았다.

• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2011년도 제45차 학술발표회
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• pp.34-34
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• 2011

Recently, people have concerned about environmental pollution. This environmental pollution occur due to many reasons such as heavy metal ions and anions. In this regard, many researchers have studied organic materials to monitor above reasons to protect environmental pollution. One of the organic materials for this function is chemosensor. This chemosensor has been studied and reported about monitoring toxic heavy metal ions and anions. In this study, the dye sensor was designed and synthesized through reaction of Rhodamine 6G and 1,3-Indanedion. this dye sensor selective detected $Hg^{2+}$ metal ions while showing red color absorption and yellowish-green strong fluorescence emission compared to other heavy metal ions such as $Cu^{2+}$, $Hg^{2+}$, $Ag^{2+}$, $Zn^{2+}$, $Fe^{2+}$ and $Fe^{3+}$. In this regard, we anticipated that this dye senosr can provide an significant material for monitoring mercury which cause environmental pollution. Thus, We investigated detailed properties of this dye sesnor with using UV-Vis absorption and fluorescent spectrophotometer, Job's plot method for metal binding complex, computational simulated calculation named Material Studio 4.3 suite to approach for electron distribution and HOMO/LUMO.

• Corrosion Science and Technology
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• 제6권6호
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• pp.282-285
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• 2007

Smaller size and higher integration of electronic systems make narrower interconnect pitch not only in chip-level but also in package-level. Moreover electronic systems are required to operate in harsher conditions, that is, higher current / voltage, elevated temperature / humidity, and complex chemical contaminants. Under these severe circumstances, electronic components respond to applied voltages by electrochemically ionization of metals and conducting filament forms between anode and cathode across a nonmetallic medium. This phenomenon is called as the electrochemical migration. Many kinds of metal (Cu, Ag, SnPb, Sn etc) using in electronic packages are failed by ECM. Eutectic SnPb which is used in various electronic packaging structures, that is, printed circuit boards, plastic-encapsulated packages, organic display panels, and tape chip carriers, chip-on-films etc. And the material for soldering (eutectic SnPb) using in electronic package easily makes insulation failure by ECM. In real PCB system, not only metals but also many chemical species are included. And these chemical species act as resources of contamination. Model test systems were developed to characterize the migration phenomena without contamination effect. The serpentine-shape pattern was developed for analyzing relationship of applied voltage bias and failure lifetime by the temperature / humidity biased(THB) test.

• 통합자연과학논문집
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• 제2권1호
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• pp.18-23
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• 2009

This minireview provides the chosen examples of our recent discoveries in the polymerization of hydrosilanes, dihydrosilole, lactones, and vinyl derivatives using various catalysts. Hydrosilanes and lactones copolymerize to give poly(lactone-co-silane)s with $Cp_2MCl_2$/Red-Al (M = Ti, Zr, Hf) catalyst. Hydrosilanes (including dihydrosilole) reduce noble metal complexes (e.g., $AgNO_3$, $Ag_2SO_4$, $HAuCl_4$, $H_2PtCl_6$) to give nanoparticles along with silicon polymers such as polysilanes, polysilole, polysiloxanes (and silicas) depending on the reaction conditions. Interestingly, phenylsilane dehydrocoupled to polyphenylsilane in the inert nitrogen atmosphere while phenylsilane dehydrocoupled to silica in the ambient air atmosphere. $Cp_2M/CX_4$ (M = Fe, Co, Ni; X = Cl, Br, I) combination initiate the polymerization of vinyl monomers. In the photopolymerization of vinyl monomers using $Cp_2M/CCl_4$ (M = Fe, Co, Ni), the photopolymerization of MMA initiated by $Cp_2M/CCl_4$ (M = Fe, Co, Ni) shows while the polymerization yield decreases in the order $Cp_2Fe$ > $Cp_2Ni$ > $Cp_2Co$, the molecular weight decreases in the order $Cp_2Co$ > $Cp_2Ni$ > $Cp_2Fe$. For the photohomopolymerization and photocopolymerization of MA and AA, the similar trends were observed. The photopolymerizations are not living. Many exciting possibilities remain to be examined and some of them are demonstrated in the body of the minireview.