• Title/Summary/Keyword: 유기염료

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Decomposition of Dye Chemicals by Electrolytic Oxidation Method (전기분해법을 이용한 염료분해에 관한 연구)

  • Lee, Tae-Jin;Chun, Byoung Chul;Chung, Yong-Chan
    • Clean Technology
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    • v.12 no.3
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    • pp.145-150
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    • 2006
  • Electrolysis of aqueous solution produces hydroxide ions and proton ions for the hydrolysis of reactive organic compounds, and oxidizing agent such as hypochlorite ions for the oxidative decomposition of organic chemicals. Electrolytic decomposition of dying chemicals was tested with our custom made system, and analyzed by HPLC and UV-VIS spectrophotometer. The electrolytic system could decompose dying chemicals with very high reactivity and low cost. Disposal of byproduct and refill of reactant during electrolysis was not necessary. Decomposition time of dying chemicals is compared under similar conditions, and application to water purification is discussed.

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Pollution prevention in the process of dye production by cleaner production methodology (청정생산방법론에 의한 염료생산 공정의 청정화)

  • Park, Chulhwan;Kim, Tak-Hyun;Kim, Sangyong
    • Clean Technology
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    • v.9 no.3
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    • pp.145-151
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    • 2003
  • This study shows the evaluation and consulting for pollution prevention of dye production by cleaner production methodology. Especially, this study intended to investigate the methods for reduction of process water and recovery of organic solvent (DMF), and to modify the process for higher qualified products in the acid dye production by cleaner production methodology. This methodology, consisting of 7 sequential phases (business leadership decision to start, problem definition, evaluation of the screened options, option selection for implementation, implementation, monitoring and sustainable implementation), is based on initial developments in the USA and Western Europe. Reduction of process water over 25%, recovery of DMF and solubility enhancement of acid dye over 2 times were achieved.

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Development Trends and Perspectives of Organic Solar Cells (유기 태양전지 개발 동향 및 전망)

  • Kang, Moon-Sung;Kang, Yong Soo
    • Applied Chemistry for Engineering
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    • v.16 no.2
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    • pp.159-168
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    • 2005
  • Dye-sensitized solar cells (DSCs) have been under investigation for the past decade due to their attractive features such as high energy conversion efficiency and low production costs. The basis for energy conversion is the injection of electrons from a photoexcited state of a dye sensitizer into the conduction band of the nanocrystalline $TiO_2$ semiconductor upon absorption of light. It is believed that the DSC is one of the most promising candidates for renewable energy sources. In this review, the development trends and perspectives of DSCs are investigated.

Preparation and Polarization Properties of Poly(vinyl alcohol) Polarizing Film Using the Mixed System of Supercritical $CO_2$/Organic Solvents/Dichroic Dye (초임계 탄산가스/유기용매/이색성 염료의 혼합계를 이용한 폴리(비닐 알코올) 편광필름의 제조 및 편광특성)

  • Park, Ki-Sang;Choi, E-Joon;Chang, Jin-Ho;Park, Il-Hyun
    • Polymer(Korea)
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    • v.35 no.5
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    • pp.458-466
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    • 2011
  • In the mixed system of supercritical carbon dioxide/organic solvents, poly(vinyl alcohol)(PVA) film of high degree of hydrolysis could be dyed with a dichroic dye of C. I. direct black 22(DB22) and as a result, high durability was obtained. Especially, as a dye dispersant in a supercritical fluid phase, a mixed solvent system of ethylene glycol: dimethyl sulfoxide=4 : 6 weight ratio was investigated. Then the optimum pressure for dyeing could be reduced down to 200 bar. Using this supercritical fluid system, the maximum dyeing appeared as the transmittance of less than 1% and the waste amount was reduced to the level of 1/10. After 500% drawing of this PVA film, both the polarizing efficiency of 94% and the single piece transmittance of 30% were obtained. The limitation of DB22 and further improvements were also discussed.

The Influence of Fluorescent Dye Doping on Efficiency of Organic Light-Emitting Diodes (형광염료 도핑이 유기발광소자의 효율에 미치는 영향)

  • Lee, jeong-gu
    • Proceedings of the Korea Contents Association Conference
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    • 2008.05a
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    • pp.301-305
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    • 2008
  • An organic light-emitting diode(OLED) has advantages of low power driving, self light-emitting, wide viewing angle, excellent high resolution, full color, high reproduction, fast response speed, simple manufacturing process, or the like. However, there are still a number of challenges to get over in order to put it to practical use as a high performance display. First of all, the most important thing is to improve the efficiency of the OLED element in order to commercialize it. To this end, its efficiency can be improved by lowering the driving voltage through the improvement of structure of the OLED element and the application of new organic substance. Therefore, in this study, we have manufactured a red OLED element by applying fluorescent dyes to the emitting layer of the element having the structure of ITO/TPD/Znq2+DCJTB/Znq2/Al and the structure of ITO/CuPc/NPB/Alq3+DCJTB/Alq3/Al, in order to light-emitting various colors or improve the brightness and the efficiency, and then we have evaluated its electrical and optical characteristics.

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Photocatalytic Membrane for Contaminants Degradation: A Review (오염물질 분해를 위한 광촉매 분리막: 총설)

  • Kahkahni, Rabea;Patel, Rajkumar;Kim, Jong Hak
    • Membrane Journal
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    • v.32 no.1
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    • pp.33-42
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    • 2022
  • Growing industrialization leads to severe water pollution. Organic effluents from pharmaceuticals and textile industries released in wastewater adversely affect the environment and human health. Presence of antibiotics used for antibacterial treatment in wastewater leads to the growth of drug resistance bacteria, which is very harmful for human being. Various small organic molecules are used for the preparation of organic dye molecules in the textile industries. These molecules hardly degrade, which is present in the wastewater effluents from printing and dyeing industries. In order to address these problems, photoactive catalyst is embedded in the membrane and wastewater are passed through it. Through this process, organic molecules are photodegraded and at the same time, the degraded compounds are separated by the membrane. Titanium dioxide (TiO2) is a semiconductor which behave as excellent photocatalyst. Photocatalytic ability is enhanced by the making its composite with other transition metal oxide and incorporated into polymeric membrane. In this review, the degradation of dye and drug molecules by photocatalytic membrane are discussed.

Fabrication and Characterization of an optical oxygen gas sensor formed on the planar optical waveguide prepared by ion exchang method (이온 교환법으로 제조된 평판형 광도파로의 산소광센서의 제작 및 특성평가)

  • 정채환;김재성;김원효;이병택;문종하;김진혁
    • Proceedings of the Optical Society of Korea Conference
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    • 2002.07a
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    • pp.178-179
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    • 2002
  • 최근에 화학, 임상병리, 환경 감시 등의 분야에서 산소센서의 수요가 점차 증가하고 있다. 이러한 산소 센서 중에 가장 많이 쓰이는 방식은 산화물 전극을 사용하는 amperometric 방법이지만 이 방법들은 장기간에 걸쳐 볼 때 산화물 전극의 오염, 외부 자기장의 간섭 등의 제점 때문에 산소를 측정하는데 많은 어려움이 있다. (1) 따라서 최근에는 빛과 유기염료를 통하여 산소의 농도가 증가할수록 세기가 quenching이 되는 원리를 이용한 산소센서의 연구가 이루어졌다. (중략)

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A Study of Polymer/Ceramics Composite with Application to Dye Host (유기염료의 HOST로 응용된 고분자/세라믹 복합체에 관한 연구)

  • 이동아;김구대;강현규;문지웅
    • Journal of the Korean Ceramic Society
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    • v.31 no.4
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    • pp.367-374
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    • 1994
  • Inorganic-organic composite was made through sol-gel process. Possible range for hosting organic dye was investigated with various composition. The transmittance of the composite was the most important condition for a host was increased to 90% with decreasing HCl as a catalyst. Clear absorbance peak was obtained by decreasing concentration of organic dye, fluorescent intensity was increased and transmittance was decreased with rising gelling temperature.

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Effects of organic additives in copper sulfate electroplating baths (황산동 전기도금육중 유기첨가제의 영향)

  • 강치오;이주성
    • Journal of the Korean institute of surface engineering
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    • v.16 no.4
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    • pp.160-172
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    • 1983
  • 티오요소류, 폴리에테르류, 염료와 같은 유기화합물이 첨가된 황산동 전기도금욕에서 석출된 구리의 광택, 평활력효과를 무첨가욕과 기존 광택제가 첨가된 도금욕에서와 각각 비교하여 이들 유기첨가제가 구리의 석출상태와 음극분극에 미치는 영향을 Hull cell 실험과 현미경관찰, 전기화학적 측정방법에 의해 고찰하였다. 황산동 전기도금욕에서 thiourea, 2-mercapto-2-imidazoline, 1-acetyl-2-thiourea와 같은 유기 황화합물은 비교적 고전류 밀도 범위에서 결정성장이 억제되고 입자가 미세한 구리석출을 일으켜 양호한 광택효과와 평활력을 가져오나, 특히 저전류밀도에서는 해로운 줄무늬가 발생한다는 점에서 많은 개선의 여지가 필요하다. 그러나 이들 유기 황화합물에 1,3-dioxolane polymer와 소량의 염소 이온을 혼합 첨가할 것 같으며 넓은 전류밀도 범위에서 양호한 광택과 평활력이 있는 동석출을 얻을 수 있었다.

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