• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2017년도 춘계학술대회 논문집
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• pp.151.1-151.1
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• 2017

This work studied the corrosion behavior of AZ31 Mg alloy galvanically coupled with Cu during immersion in 0.1 and 0.5 M NaCl solutions by in-situ observation and galvanic corrosion current measurement using a zero resistance ammeter. The corrosion behavior of AZ31 Mg alloy was also studied by salt spray test. The average galvanic corrosion density during 2 h immersion in 0.1 NaCl solution was found to decrease as an exponential function with increasing the surface area ratios between AZ31:Cu or with increasing the distance between AZ31 and Cu. The corrosion of electrodeposited Cu on AZ31 Mg alloy was concentrated at the area next to Cu (about 5 mm for immersion test and 2 mm for salt spray test) and pitting corrosion was accelerated at the area beyond the severely corroded area by the galvanic coupling effect.

• Nuclear Engineering and Technology
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• 제55권8호
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• pp.2742-2746
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• 2023

The corrosion behavior of copper immersed in dilute oxychloride solution (100 mM) was studied through surface investigation and in-situ monitoring of open-circuit potential. The copper corrosion was initiated with copper dissolution into a form of CuCl^-₂, resulting in mass decrease within the first 40 h of immersion. This was followed by a hydrolysis reaction initiated by the CuCl^-₂ at the copper surface, after which oxide products were formed and deposited on the surface, resulting in a mass increase. The formation of nucleation sites for copper oxide and its lateral extension during the corrosion process were examined using focused ion beam (FIB)-scanning electron microscopy (SEM). The presence of metastable compounds such as atacamite (CuCl₂·3Cu(OH)₂) on the corroded copper surface was revealed by X-ray photoelectron spectra (XPS) and transmission electron microscopy (TEM)-energy dispersive spectrometry (EDS) analysis.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2007년도 추계학술대회 논문집
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• pp.112-113
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• 2007

ZnS:Cn,Cl phosphor was coated by solid-gel reaction with $SiO_2$ outside layer. The effect of $Cu^{2+}$ -doping concentration has been investigated on the luminescence characteristics of ZnS:Cn,Cl blue-green phosphors for inorganic electro luminescent device. Also, SiO2 coated layers' effect on luminescence characteristics. Evaluation of luminescence characteristics dependent on the synthesis conditions is important to get high-performance phosphors properties. EL and PL properties such as luminescence intensity and chromaticity of ZnS:Cn,Cl phosphors synthesized with different concentration of activator, $Cu^{2+}$, were analysed separately

• 한국결정학회지
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• 제17권2호
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• pp.46-50
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• 2006

이핵 구리 착물(錯物) {[Cu(pmea)Cl][Cu$(H_2O)_3]}Cl_2\cdot H_2O$ (1) (Hpmea=bis(2-pyridylmethyl)amino-2-ethanoic acid)을 합성(合成)하고 구조(構造)를 규명(糾明)하였다. 이 착물(錯物)은 단사정계(單斜晶系), 공간군(空間群) $P2_1/c$, a=9.0008(6) ${\AA}$, b=28.0171(19) ${\AA}$, c=8.5590(6) ${\AA}$, $\beta$=104.2280(10)$^{\circ}$, V=2092.2(2) ${\AA}^3$, Z=4로 결정화(決定化) 되었다. 착물(錯物) 1의 결정구조(結晶構造)는 대칭(對稱)-반대칭(反對稱) carboxylate 다리로 연결(連結)된 이핵 착물(錯物)로서, 각각(各各) 구리원자의 배위환경(配位環境)은 고천(若千) 일그러진 사각뿔구조(構造)와 고천(若干) 일그러진 사각평면구조(構造)를 갖는다.

• Current Photovoltaic Research
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• 제1권1호
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• pp.44-51
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• 2013

For preparing a device-quality $CuInSe_2$ (CISe) light-absorbing layer by single-bath electrodeposition for a superstrate-type CISe cell, morphological properties of the CISe layers were investigated by varying concentrations of sulfamic acid and potassium biphthalate, complexing/buffering agents. CISe films were grown on an $In_2Se_3$ film by applying a constant voltage of -0.5V versus Ag/AgCl for 90 min in a solution with precursors of $CuCl_2$, $InCl_3$, and $SeO_2$, and a KCl electrolyte. A dense and smooth layer of CISe could be obtained with a solution containing both sulfamic acid and potassium biphthalate in a narrow concentration range of combination. A CISe layer prepared on the $In_2Se_3$ film with proper concentrations of complexing/buffering agents exhibited thickness of $1.6{\sim}1.8{\mu}m$ with few undesirable secondary phases. On the other hand, when the bath solution did not contain either sulfamic acid or potassium biphthalate, a CISe film appeared to contain undesirable flake-shape $Cu_{2-x}Se$ phases or sparse pores in the upper part of film.

• 대한환경공학회지
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• 제27권1호
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• pp.75-84
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• 2005

본 연구는 해양구조물로 재활용되는 제강 슬래그의 납, 구리, 카드뮴과 수은의 용출특성을 평가하는데 있다. 이를 위하여 고형폐기물의 용출규제 시험, 액고비 변화시험, pH 고정시험과 같은 다양한 용출시험을 하였다. 용출용매로 증류수를 이용한 경우와 해수를 이용한 경우의 pH 고정시험 결과, 제강슬래그에서 용출된 납, 구리, 카드뮴은 뚜렷한 차이를 확인할 수 있었다. 용출용매로 증류수 사용시, pH 7-8 구간과 pH 11-12 구간에서 낮은 용출을 보였지만, 해수를 용출용매로 사용한 경우는, 증류수를 용매로 사용한 것 보다 높게 용출되었다. 수은 용출의 경우는 증류수를 용출용매로 이용한 것보다 해수를 이용한 경우에서 더 낮게 용출되었다. 한편, 제강 슬래그에서 용출되는 납, 구리, 카드뮴의 용존 및 침전 상태의 파악과 중금속 화합물들의 파악을 위하여 지화학 평형 프로그램인 Visual minteq를 사용하였다. 해수와 반응한 제강 슬래그에서 용출된 납, 구리는 pH 11-12 구간에서 대부분 용존되지만 pH가 감소되는 pH 7-10에서는 90% 이상만이 침전하였고, 카드뮴의 경우는 100% 용존상태로 존재하였다. 증류수와 반응한 제강 슬래그에서 용출된 납은 해수의 경우도 유사하였고, 구리와 카드뮴은 100% 용존상태로 존재하였다. 해수 내의 $Cl^-,\;CO_3^{-2},\;SO_4^{-2}$와 결합한 납화합물은 $PbCl^+,\;PbSO_4$로 이루어졌으며, 구리화합물은 $CuSO_4,\;CuCO_3$, 카드뮴화합물은 $CdCl^+,\;CdSO_4$ 등이 형성되었다. 수은의 경우는 해수 및 증류수를 용출용매로 이용한 모든 경우에서 납, 구리, 카드뮴과는 달리 대부분 침전하였다. 더욱이 해수에 존재하는 고농도 염소($Cl^-$)와의 수착으로 인해 finite solid인 calomel($Hg_2Cl_2$)이 형성되어 대부분 침전(SI=0)되기 때문에 납, 구리, 카드뮴 보다 더 낮은 환경이동성을 갖을 것으로 사료된다. 상기 실험결과 용출용매로 증류수와 해수를 이용했을 때, 제강 슬래그에서 용출되는 납, 구리, 카드뮴, 수은의 용출 경향의 차이를 확인할 수 있었고 이에 따라서, 납, 구리, 카드뮴의 용출 유해성은 낮기 때문에 해양구조물로의 제강슬래그 유효이용은 적합할 것으로 판단되었다.

• Journal of Advanced Marine Engineering and Technology
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• 제30권4호
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• pp.514-519
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• 2006

SrS:Cu, Cl thin films have been grown by the hot wall technique with S furnace placed on the outside of the growth chamber in order to investigate the crystallographic and optical characteristics. The films have a good crystallinity independent of CuCl wall temperature and PL characteristics showed a peak assigned by the transition form $3d^94s^1\;(^3Eg)$ to $3d^{10}\;(^1A_{1g})$ of $Cu^+$ center. It has also been found that. from the PLE spectra, $Cu^+$ luminescent centers are doped in the host materials. The EL emission from SrS:Cu-based device showed a greenish-blue but shifted to short wavelength compared to SrS:Ce-based EL. The device was obtained the maximum luminance of $110cd/m^2$ and the maximum luminous efficiency of $0.1\;lm/W$ at $V_{40}$.

• Bulletin of the Korean Chemical Society
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• 제31권12호
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• pp.3723-3729
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• 2010

We investigated the high-excitation voltage cathodoluminescence (CL) performance of blue light-emitting (ZnS:Ag,Al,Cl) and green light-emitting (ZnS:Cu,Al) phosphors coated with metal oxides ($SiO_2$, $Al_2O_3$, and MgO). Hydrolysis of the metal oxide precursors tetraethoxysilane, aluminum isopropoxide, and magnesium nitrate, with subsequent heat annealing at $400^{\circ}C$, produced $SiO_2$ nanoparticles, an $Al_2O_3$ thin film, and MgO scale-type film, respectively, on the surface of the phosphors. Effects of the phosphor surface coatings on CL intensities and aging behavior of the phosphors were assessed using an accelerating voltage of 12 kV. The MgO thick film coverage exhibited less reduction in initial CL intensity and was most effective in improving aging degradation. Phosphors treated with a low concentration of magnesium nitrate maintained their initial CL intensities without aging degradation for 2000 s. In contrast, the $SiO_2$ and the $Al_2O_3$ coverages were ineffective in improving aging degradation.

• 한국결정학회지
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• 제15권2호
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• pp.99-103
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• 2004

X-선 회절법을 이용하여 $C_{16}H_{19}O_2N_3CuCl_2\;{\cdot}\;H_2O$의 분자 및 결정구조를 해석하였다. 이 결정의 결정계는 Triclinic이고 공간군은 Pl이며, 단위포 상수는 $a=7.6202(9)\;{\AA},\;b=8.5943(7){\AA},\;c= 8.6272(6){\AA},\;\alpha=67.518(6)^{\circ},\; \beta= 68.043(8)^{\circ},\;\gamma=74.370(8)^{\circ},\;V=478.89(8)\;{\AA}^3,\;T=295K,\; Z=1,\;D_c=1.504Mgm^{-3}$이다. 회절반점들의 세기는 Enraf-Nonius CAD-4 Diffractometer로 얻었으며 graphite로. 단색화한 $MoK{\alpha}$,$(\alpha=0.7107\;\AA)$을 사용하였다. 분자구조는 Direct method로 풀었으며, $F_0>4\sigma(F_0)$인 1659개의 독립회절데이터에 대하여 최소 자승법으로 234개의 변수를 정밀화하여 최종 신뢰도 값 $R=2.47\%$를 얻었다.

• Bulletin of the Korean Chemical Society
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• 제25권5호
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• pp.673-675
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• 2004

The tetranuclear copper(II) cluster compound $[Cu_4OCl_6(C_{14}H_{12}N_2)_4]$ has been synthesized by hydrothermal reaction and studied by X-ray diffraction. The four copper(II) atoms locate four capsheaves of a tetrahedral skeletal structure and a oxygen atom as interstitial atom occupies the center position of the same tetrahedron, and each edge of the Cu-Cu tetrahedron is bridged by one ${\mu}_2$-Cl anion. The copper atom possesses slightly distorted trigonal bipyramidal geometry with three ${\mu}_2$-Cl atoms in equatorial position and the interstitial O atom and one N atom from 3-benzyl-benzimidazole ligand occupying axial position. The Cu-Cu distances are in the range of 3.0986-3.1162 ${\AA}$. The EPR spectrum suggested that the copper(II) ground state $d_{x2-y2}$ and the coordination geometry was trigonal bipyramidal.