• Title, Summary, Keyword: Diphenyl-DPP

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The Concentration-Dependent Distribution of Tris(4,7'-diphenyl-1,10'-phenanthroline) Ruthenium (II) within Sol-Gel-Derived Thin Films

  • Lee, Joo-Woon;Cho, Eun-Jeong
    • Bulletin of the Korean Chemical Society
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    • v.32 no.8
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    • pp.2765-2770
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    • 2011
  • Organic dye-doped glasses, viz., ruthenium (II) tris(4,7'-diphenyl-1,10'-phenanthroline) $[Ru(dpp)_3]^{2+}$ incorporated into thin silica xerogel films produced by the sol-gel method, were prepared and their $O_2$ quenching properties investigated as a function of the $[Ru(dpp)_3]^{2+}$ concentration (3-400 ${\mu}M$) within the xerogel. The ratio of the luminescence from the $[Ru(dpp)_3]^{2+}$-doped films in the presence of $N_2$ and $O_2$ ($I_{N2}/I_{O2}$) was used to describe the film sensitivity to $O_2$ quenching. ($I_{N2}/I_{O2}$ changed three-fold over the $[Ru(dpp)_3]^{2+}$ concentration range. Time-resolved intensity decay studies showed that there are two discrete $[Ru(dpp)_3]^{2+}$ populations within the xerogels (${\tau}_1$ ~ 300 ns; ${\tau}_2$ ~ 3000 ns) whose relative fraction changes as the $[Ru(dpp)_3]^{2+}$ concentration changes. The increased $O_2$ sensitivity that is observed at the higher $[Ru(dpp)_3]^{2+}$ concentrations is a manifestation of a greater fraction of the 3000 ns $[Ru(dpp)_3]^{2+}$ species (more susceptible to $O_2$ quenching). A model is presented to describe the observed response characteristics resulting from $[Ru(dpp)_3]^{2+}$ distribution within the xerogel.

( Syntheses of Improved Polymer/Organic Materials for Electroluminescence(EL) Device and Electro-Optical Characteristics I. Properties of Dye Doped Organic EL Device (고기능 EL소자용 고분자/유기 재료의 합성 및 전기 광학적 특성 I. 색소 도핑에 의한 EL소자의 특성)

  • 김성훈
    • Journal of the Korean Printing Society
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    • v.13 no.2
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    • pp.33-45
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    • 1995
  • 1, 4-Diketo-3, 6-diphenyl-pyrrolo-[3, 4c]-pyrrole(abbriviated DPP) is a new heterocyclic pigment of red color whose chlorinated derivative is now on the market. DDP was synthesized from benzonitrile and diethylsuccinate. Pariser-parr-pople(PPP) molecular orbital calculations have been carried out on the DPP in other to study spectroscopically the DPP chromophore on deprotonation.

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Synthesis and Photoluminescence of Pyrazoline Derivative (Pyrazoline 유도체의 합성과 분광특성)

  • Lee, Mun-Hag;Kang, Dong-Eun;Yu, Jung-Yi;Lee, Tae-Hoon;Kim, Sung-Bin;Son, Se-Mo
    • Journal of the Korean Printing Society
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    • v.21 no.2
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    • pp.101-108
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    • 2003
  • We synthesised 1,3-Diphenyl-5-pyren-2-yl-4,5-dihydro-1H-pyrazole(DPP) and investigated its optical properties. The structure of DPP was confirmed by GC-Mass and elemental analysis. The absorption and photoluminescent spectra of DPP were measured at both hydrophobic and hydrophilic solvents and by the stokes shifts of DPP Lippert's equation could be applied. The results showed linear relation between $[{\varepsilon}-1/2{\varepsilon}+1)-(n^2-1/2n^2+1)]$ and $({\mu}_g\;-\;{\mu}_2)^2$.

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Synthesis and Absorption Spectra of 1,4-Diketo-3,6-Diphenyl-Pyrrolo-[3,4c]-Pyrrole (1,4-Diketo-3,6-Diphenyl-Pyrrolo-[3,4c]-Pyrrole(DPP)계 유기안료의 합성 및 흡수스펙트라)

  • 김성훈
    • Journal of the Korean Printing Society
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    • v.14 no.1
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    • pp.1-15
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    • 1996
  • In this paper, the preparation of lead zirconium titanate(PZT) thin film by sol-gel processing was descried. Thin film coated with thickness of 4${\mu}{\textrm}{m}$ on the stainless steel substrates using the multiple spin-coating process. The crystalline phases of PZT powder and film were investigated by X-ray diffraction pattern and PZT thin film has perovskite structure over 600 C annealing temperature. Corona charging characteristics of the ferroelectric PZT thin film at 600 C were investigated by electrophotographic measurement. A difference in the charging characteristics between positive and negative corona charging was found. The charge acceptance depended in the polarity of corona and the poling of film. According to the D-E hysteresis measurment, PZT thin film can be poled by corona charging without use of top electrode. The remnant polarization in the PZT thin film is generally in the order of 48$\mu$C/$\textrm{cm}^2$. From this results, the ferroelectric PZT thin film will be possible to apply for the add-on type imaging formation.

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Processing Characteristics of Nylon 6 by Controlling the Melt Viscosity (용융 점도 조절에 의한 나일론6의 가공특성 연구)

  • Kim Hyogap;Kim Jun Kyung;Lim Soonho;Lee Kunwong;Park Min;Kang Ho-Jong
    • Polymer(Korea)
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    • v.29 no.6
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    • pp.565-570
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    • 2005
  • Melt processing characteristics of nylon 6 (N6) has been investigated by controlling the melt viscosity in melt impregnation process. Calcium stearate (CaST) was introduced as a lubricant for N6 and the melt viscosity of N6 decreased with adding only 1 wt$\%$ of CaST. In addition, reactive blending with polycaprolactone (PCL) was carried out by lowering the melt viscosity in N6. It was found that the melt viscosity of N6 could be controlled and further melt viscosity drop could be obtained by applying phenyl phosphite (PP) and diphenyl phosphite (DPP) to enhance the transesterification between N6 and PCL. Our approaches show that the melt viscosity of N6 could be reduced without loss of thermal stability which is the critical problem in high temperature melt impregnation process of N6.

Development and Characterization of Optical Dissolved Oxygen Sensor based on the Fluorescence Detection (형광검출기반 광학식 용존산소 측정센서 개발 및 특성 분석)

  • Kwak, Hyun Min;Kwon, Myeunghoi;Choi, Gyewoon;Jung, Yoonseok;Jung, Changhwan;Park, Kiuha;Sohn, Okjae;Kim, Junhyong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.1
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    • pp.569-574
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    • 2014
  • We developed and evaluated a fluorescence-based optical DO sensor (OS-100, Global Optical Communication Ltd., Korea) for long-term monitoring of the dissolved oxygen concentration in waste water treatment. Fluorescent sensing membrane containing $Ru(Dpp)_3{^{2+}}$ (tris(4,7diphenyl-1, 10-phenanthroline) ruthenium(II)) was prepared with GA sol-gel matrix and coated on a quartz plate by sprayed method. Properties of sensor film exhibit deviation about ${\pm}1%$ under wide range of DO concentration from 3 to 10. The developed optical DO sensor was actually mounted in waste water from dyeing industry and successfully applied for on-line DO monitoring. Online monitoring results showed the changes of DO concentrations in wastewater treatment processes with accuracy better than ${\pm}2%$ during the 6 months measurements period in vicious environmental conditions.

Development of Optical Fiber Glucose and Lactate Biosensors for Bioprocess Monitoring (생물공정 모니터링을 위한 광섬유 포도당 및 젖산 센서의 개발)

  • Jung, Chang Hwan;Sohn, Ok-Jae;Rhee, Jong Il
    • KSBB Journal
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    • v.32 no.1
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    • pp.35-45
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    • 2017
  • In this work the optical fiber glucose and lactate biosensors were developed by using fluorescent dye and enzyme immobilized on the end tip of an optical fiber. 3-Glycidyloxypropyl)methyldiethoxysilane (GPTMS), (3-Aminopropyl) trimethoxysilane (APTMS) and Methyltrimethoxysilane (MTMS) were used to immobilize glucose oxidase (GOD), lactate oxidase (LOD) and ruthenium(II) complex (tris(4,7-diphenyl-1,10-phenanthroline) ruthenium(II), $Ru(dpp)_3^{2+}$) as oxygen sensitive fluorescent dye. MTMS sol-gel was an excellent supporting material for the immobilization of $Ru(dpp)_3^{2+}$, GOD, and LOD on the optical fiber. Storage stability of the optical fiber glucose sensor was kept constant over 20 days, while the optical fiber lactate sensor had constant storage stability over 17 days. The optical fiber glucose and lactate biosensors also maintained good operational stability for 20 hours and 14 hours, respectively. The activities of the immobilized enzymes were most excellent at pH 7 and at $25^{\circ}C$. On-line monitoring of glucose and lactate in a simulated process was performed with the optical fiber glucose and lactate biosensors. On-line monitoring results were agreed with those of off-line data measured with high performance liquid chromatography (HPLC).

Protective Effect of Marine Natural Products against UVB-induced Damages in Human Skin Fibroblast via Antioxidant Mechanism (자외선으로 유도된 섬유아세포 손상에 대한 해양소재 추출물의 항산화 보호효과)

  • Jang, Jung-Hee;Lee, Chan;Kim, Sang-Chan;Chung, Ji-Wook;Park, Chan-Ik
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.36 no.1
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    • pp.79-87
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    • 2010
  • Ultraviolet is the one of the main environmental factors promoting aging process via increased intracellular generation of reactive oxygen species (ROS) and decreased expression of endogenous antioxidant enzymes and molecules. Therefore, in this study, we tried to search for natural skin-protective antioxidant materials from marine origins (Porphyra Thalli, Laminariae japonicae thallus, Ostreae Concha, Sargassum Thallus, Undaria thallus, Haliotidis Concha, Codium thalli, Syngnathoides biaculeatus, Hippocampus, Stichopus Stichopus, Thalli, Hizikia fusiforme thalli) which exhibit free radical scavenging activity and protect against UVB-induced cytotoxicity and oxidative cell death. Free radical scavenging activity was shown in order of Undaria thallus. Sargassum Thallus, Laminariae japonicae thallus, Hippocampus, Haliotidis Concha, Ostreae Concha, Syngnathoides biacuJeatus. In another experiment, UVB-induced cytotoxicity and cell death were effectively suppressed by treatment of Sargassum Thallus, Haliotidis Concha, Codium thalli, or Hippocampus water extract. Furthermore, UVB-induced cell death was mediated by intracellular accumulation or ROS, which was significantly inhibited by treatment with aforementioned extracts. The protective effect of these marine natural products seemed to be mediated by increased expression of antioxidant enzymes such as catalase, superoxide dismutase, and heme oxygenase-1. These results suggest that Sargassum Thallus, Haliotidis Concha, Codium thalli, and Hippocampus may have preventive and protective potentials as new functional cosmetics against oxidative stress-mediated skin damages and aging with antioxidant properties.