• Title/Summary/Keyword: 유기첨가제

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Property Change by Organic Additives in Electroplated Nickel-copper Thin Films (유기첨가제에 의한 전기도금 니켈-구리 박막의 물성변화)

  • Lee, Jung-Ju;Hong, Ki-Min
    • Journal of the Korean Magnetics Society
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    • v.15 no.3
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    • pp.198-201
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    • 2005
  • We investigated the effects of organic additives on the properties of nickel-copper thin films prepared by electroplating. Compared with thin films fabricated by pure electrolyte only, the films utilizing organic additives show different crystalline orientations. With no alteration of plating conditions simply adding the organic materials changed the composition of copper and nickel. The concentration of nickel could be varied to $65-95\%$ depending on the species and concentration of the additives. The change of material property has contributed to the increase or decrease of the magnetoresistance.

Properties Change of Electroplated Permalloy Thin Films by Organic Additives (유기첨가제에 의한 전기도금 퍼말로이 박막의 물성변화)

  • Bang, Won-Bae;Bae, Jong-Hak;Hong, Ki-Min;Chung, Jin-Seok;Ko, Young-Dong;Lee, Hee-Bok
    • Journal of the Korean Magnetics Society
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    • v.17 no.3
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    • pp.133-136
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    • 2007
  • We investigated the changes of the magnetic properties in electroplated Permalloy thin films by a few organic additives added to the plating electrolytes. Under identical electroplating conditions, the crystalline orientations and the surface roughness of the plated thin films were different from those prepared with a pure electrolyte. These property changes reduced the coercivity and increased the magnetoimpedance ratio (MIR) up to 20%.

Study on the Surface Morphology and Control of Impurity by Organic Additive for Tin electro-refining (주석 전해정련에서 유기첨가제에 따른 표면형상 및 전해불순물 제어에 관한 연구)

  • Park, Sung Cheol;Son, Seong Ho;Kim, Yong Hwan;Han, Chul Woong;Lee, Ki-Woong
    • Resources Recycling
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    • v.25 no.4
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    • pp.49-53
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    • 2016
  • The electro-refining process was performed to purify the casted tin crude metal from waste tin in methanesulfonic acid. The surface morphologies of electrodeposited tin on cathode were observed, the dendrite and delamination were inhibited by glycol group of organic additive. The impurity concentrations of tin crude metal and deposited metal were analyzed using ICP-OES. Quantitative analysis on casted tin crude metal showed that it consists of tin with 97.280 wt.% and several impurity metals of Ag, Cu, Pb, Ni, and etc. After tin electro-refining, the purity of tin increased up to 99.956 wt.%. Reduction current by cyclic voltammetry seems to be closely related to behavior of impurity in tin electro-refining.

The Studies on synthesis of $SnO_2$ doped $In_2O_3$ (ITO: Indium Tin Oxide) powder by spray pyrolysis (분무열분해법(Spray Pyrolysis)에 의한 주석산화물이 도핑된 $In_2O_3$(ITO: Indium Tin Oxide)의 분말 제조에 대한 연구)

  • Kim, Sang Hern
    • Journal of the Korean Applied Science and Technology
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    • v.31 no.4
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    • pp.694-702
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    • 2014
  • The micron-sized ITO(indium tin oxide) particles were prepared by spray pyrolysis from aqueous precursor solutions for indium, and tin and organic additives solution. Organic additives solution with citric acid(CA) and ethylene glycol(EG) were added to aqueous precursor solution for Indium and Tin. The obtained ITO particles prepared by spray pyrolysis from the aqueous solution without organic additives solution had spherical and filled morphologies whereas the obtained ITO particles with organic additives solution had more hollow and porous morphologies with increasing mole of organic additives. The micron-sized ITO particle with organic additives was changed fully to nano-sized ITO particle whereas the micron-sized ITO particle without organic additives was not changed fully to nano-sized ITO particle after post-treatment at $700^{\circ}C$ for 2 hours and wet-ball milling for 24 hours. The size of primary ITO particle by Debye-Scherrer formula and surface resistance of ITO pellet were measured.

Effects of Organic Addition agents on Manganese-Phosphate Coating (인산-망간 화성피막에서 유기첨가제에 따른 피막 특성 연구)

  • Seo, Seon-Gyo
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2015.11a
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    • pp.195-195
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    • 2015
  • 본 연구에서는 인산-망간 피막처리 공정 중에 생성되는 슬러지를 방지하기 위하여 인산-망간 화성처리액에 유기첨가제인 Tartaric acid를 첨가하여 내마모성 및 방청성 향상을 목적으로 슬러지를 방지하기 위한 인산-망간 화성피막의 특성을 연구하였다. Tartaric acid의 농도에 따른 표면 Morphology를 Scanning Electron Microscope (SEM)과 Energy Dispersive X-ray spectroscopy (EDS)을 이용하여 분석하였으며, EDS 분석을 통해 Mn, P, Fe, O, C의 성분을 확인 할 수 있었으며, 인산-망간 화성피막의 상(phase)을 확인하기 위하여 X-ray diffraction (XRD)을 분석을 통하여 $(Mn,Fe)_5H_2(PO_4)_44H_2O$으로 구성된 인산-망간 화성피막을 확인할 수 있었다. 또한 Tartaric acid의 농도에 따른 인산-망간 피막의 내마모 시험(Ball on disc) 및 경도시험을 실시하여 기계적인 특성 및 슬러지의 양에 대하여 분석하였다.

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Synthesis and Luminescence Enhancement of Strontium Aluminate Green Phosphor via Spray Pyrolysis (분무열분해 공정을 이용하여 스트론튬 알루미네이트 녹색 형광체의 합성 및 발광 특성 개선)

  • Kim, Mi Na;Jung, Kyeong Youl
    • Korean Chemical Engineering Research
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    • v.49 no.5
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    • pp.594-599
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    • 2011
  • $SrAl_2O_4:Eu$ green phosphor was prepared by spray pyrolysis and its luminescence properties were controlled by replacing the Al sites with boron and using organic modifier or drying control chemical additive. It was clear that the substitution of B into the Al sites was helpful to obtain pure monoclinic $SrAl_2O_4$ phase and greatly enhance the emission intensity. In terms of the emission intensity, the optimal content of boron was about 1 at% with respect to the aluminum element. The luminescence intensity of $Sr_{0.9}Al_{1.98}B_{0.02}O_4:Eu_{0.1}$ phosphor could be improved by the use of 0.2 M organic additives in the spray solution. Futhermore, using 0.5 M dimethylformamide(DMF) as a drying control chemical with organic additives made it possible to improve about 172% the emission intensity of $Sr_{0.9}Al_{1.98}B_{0.02}O_4:Eu_{0.1}$ phosphor. According to XRD analysis, the organic additive and DMF used enhanced the crystallinity without any change in the crystal phase. When used only the organic additive without DMF, the surface area of the prepared $Sr_{0.9}Al_{1.98}B_{0.02}O_4:Eu_{0.1}$ phosphor became enlarged. The use of DMF with the organic additive resulted in significant reduction in the surface area. It was concluded that the increase of the crystallinity as well as the reduction of surface area mainly contribute to the improvement in the luminescence intensity of $Sr_{0.9}Al_{1.98}B_{0.02}O_4:Eu_{0.1}$ phosphor prepared using DMF and organic additives.

Study on the Copper Electro-refining from Copper Containing Sludge (저품위 동(Cu) 함유 슬러지로부터 동 전해정련에 관한 연구)

  • Lee, Jin-Yeon;Son, Seong Ho;Park, Sung Cheol;Jung, Yeon Jae;Kim, Yong Hwan;Han, Chul Woong;Lee, Man-seung;Lee, Ki-Woong
    • Resources Recycling
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    • v.26 no.6
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    • pp.84-90
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    • 2017
  • The electro-refining process was performed to recovery high purity copper from low grade copper containing sludge in sulfuric acid. The surface morphologies and roughness of electro-refining copper were analyzed with variation of the type and concentration of organic additives, the best surface morphology was obtained 5 ppm of the gelatin type and 5 to 10 ppm of the thiol type organic additive. The crude metal consisted of copper with 86.635, 94.969 and 99.917 wt.%, several impurity metals of iron, nickel, cobalt and tin by pyro-metallurgical process. After electro-refining process, the purity of copper increases to 3N or 4N grade. The impurity concentrations and copper purities of copper crude metals, electrolyte and electro-refining copper were analyzed using ICP-OES, the electro-refining time and purity of copper crude metal to recover 4N grade copper were deduced.

Improvement of the performance and emission in a four-stroke diesel engine using fuel additive (4행정 디젤엔진에 연료첨가제 사용에 따른 성능 및 배기배출물 개선에 관한 연구)

  • Ryu, Younghyun;Lee, Youngseo;Nam, Jeonggil
    • Journal of Advanced Marine Engineering and Technology
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    • v.40 no.9
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    • pp.762-767
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    • 2016
  • High thermal efficiency and the ability to use various types of fuel are a few of the many advantages of diesel engines. However, a major disadvantage is that their exhaust emissions are more harmful to humans and the environment than that of conventional engine. Consequently, the provisions of the international emissions standards for diesel engine equipped passenger cars, commercial vehicles, and ships have become more stringent. These standards include the EU Euro 6, the IMO MEPC Tier 3, and the US EPA Tier 4. Ryu et al. published a study that applied fuel additives to two-stroke diesel engines. In this study, a four-stroke diesel engine using diesel oil for a generator is utilized as the test subject, and an experiment is performed to verify whether fuel additive can be used to improve performance and exhaust emissions. In addition, this experimental study presents research results for the application of fuel additives in both two-stroke and four-stroke diesel engines. The experimental results were compared and analyzed by placing an oil-soluble calcium-based organometallic compound in diesel oil. The results confirmed that the addition of fuel additive improved the performance (fuel consumption rate, exhaust gas temperature) and exhaust emissions (NOx, CO) of the diesel engine.