• Title/Summary/Keyword: 자외선 형광

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Apparatus for Monitoring Oil Oxidation Using a Plurality of UV Fluorescence Light-reflecting Members (복수 경로를 지닌 자외선 형광측정기를 이용한 오일 산화도 측정장치)

  • Kong, H.;Han, H.G.;Markava, L.V.
    • Tribology and Lubricants
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    • v.26 no.3
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    • pp.167-174
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    • 2010
  • An apparatus for measuring oil oxidation was developed, which is capable of being mounted to mechanical devices for detecting power of fluorescent light reflected from oil in real time as an indication of the oil oxidation. This device has an advantage over conventional fluorescence spectrometers where the thin film is required for the measurement. Clean and used oil samples (mineral and synthetic oils) were tested by the developed apparatus that calculates a fluorescence quantum yield and a light absorption coefficient of the oil based upon the signals from the two light-receiving members and evaluates the degree of oil oxidation of test oils based on the fluorescence quantum yield. Results generally show that the developed device is able to effectively evaluate oil oxidation characteristics on-site in the field.

Development of a Wastewater Detection System using UV Fluorescence Reaction (자외선 형광반응을 이용한 오폐수 검출장치 개발)

  • Kim, ByoungChang
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.19 no.12
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    • pp.28-33
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    • 2020
  • Oil-related products have provided many benefits to humanity, but are significant contributors to environmental pollution. As per the International Maritime Organization (IMO) requirements, in the future, all ships must be equipped with filtering equipment and 5ppm bilge alarms that can help remove or reduce oil products during wastewater treatment. In this study, a UV fluorescence measurement system that can detect the oil components in wastewater containing both water and oil was developed. When an excitation wavelength of 254nm was used to irradiate the wastewater, the amount of UV at a divergent wavelength of 360nm was measured to measure the contamination. Based on the measurement, it was concluded that this system is suitable for use as the 5ppm bilge alarm proposed by IMO.

Photostability Evaluation of a New Sunscreen Agent, Methoxycinnamidopropyl Polysilsesquioxane (신규 자외선차단제인 Methoxycinnamidopropyl Polysilsesquioxane의 광안정성 평가)

  • Jung, Taek-Kyu;Kim, Young-Back;Yoon, Kyung-Sup
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.37 no.3
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    • pp.227-236
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    • 2011
  • The new sunscreen agent, methoxycinnamidopropyl polysilsesquioxane, is manufactured as polymeric particles with an organic/inorganic hybrid composition. We have already reported the manufacturing method, physical properties, and sunprotection effects of methoxycinnamidopropyl polysilsesquioxane. In this study, we evaluated the photochemical properties and photostabilities of methoxycinnamidopropyl polysilsesquioxane that has the same functional group as a typical organic sunscreen agent, ethylhexyl methoxycinnamate (EHMC). Using the correlation of UV absorbance and fluorescence, we studied photostabilizers to enhance the photostability of methoxycinnamidopropyl polysilsesquioxane. Finally, we confirmed that octocrylene, ethylhexyl methoxycrylene, and bis-ethylhexyloxyphenol methoxyphenyl triazine were good photostabilizers for methoxycinnamidopropyl polysilsesquioxane.

The optical property study of $Eu^{2+}$-activated yellow $\alpha$-sialon phosphors with Non-stoichiometry composition (비화학양론 조성에 따른 $Eu^{2+}$ 활성화 $\alpha$-sialon 황색 형광체의 광학 특성 연구)

  • Park, Sung-Soon;Jang, Bo-Yun;Park, Joo-Seok
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2008.06a
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    • pp.326-326
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    • 2008
  • 일반적인 고상반응법을 이용하여 $Eu^{2+}$ 활성화 $\alpha$-sialon 황색 형광체를 합성한 후 구조 및 광학특성을 측정하였다. $Ca^{2+}$$Si^{4+}$ 이온의 비화학양론적 첨가에 따른 광학 특성 측정결과, 중심 발광 파장이 약 585 nm 인 높은 휘도의 황색형광체를 얻을 수 있었다. 본 연구에서는 $Ca^{2+}:Si^{4+}$ 첨가비에 따른 광학특성 변화를 관찰하였으며, 이를 바탕으로 구조 및 미세구조 변화에 대한 연구를 수행하였다. 20 mol%의 Al deficient 조성을 갖는 형광체의 광학특성 측정결과 화학양론조성에 비해 20% 이상의 휘도향상을 나타내었다. 이와 같은 결과로부터, 본 연구에서 제시된 Al deficient $\alpha$-sialon 황색 형광체는 자외선 및 청색 LED용 형광체로 적합할 것으로 판단된다.

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Luminescence Properties of Ba1-xMoO4:Eux3+ Phosphors Subjected to Eux3+ Concentration (Eu3+ 농도에 따른 Ba1-xMoO4:Eux3+ 형광체의 발광 특성)

  • Hwang, Su-Min;Park, Tae-Jun;Jeong, U-Jin;Jang, Won-U;Kim, Chun-Su;Jo, Sin-Ho
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2012.11a
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    • pp.103-104
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    • 2012
  • 고상반응법을 사용하여 $Eu^{3+}$ 이온의 농도를 변화시키면서 $Ba_{1-x}MoO_4:Eu{_x}^{3+}$ 형광체 분말을 제조하였다. 합성한 적색 형광체의 결정 구조, 표면 형상, 발광 및 흡수 스펙트럼은 각각 XRD, SEM, 자외선-가시광선 분광기를 사용하여 조사하였다. 형광체 분말의 결정 구조는 $Eu^{3+}$ 이온의 농도비에 관계없이 $2{\theta}=26.52^{\circ}$에 주 피크를 갖는 정방정계이었으며, 최대 적색 발광 스펙트럼은 618 nm에서 관측되었다.

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Luminescence Characteristics of ${Y_2}{O_3}$:Eu Phosphor Treated with $\alpha$-${Fe_2}{O_3}$Prepared by Two Different Methods Using $FeSO_4$.$7H_2$O ($FeSO_4$.$7H_2$O를 이용하여 서로 다른 방법으로 만들어진 $\alpha$-${Fe_2}{O_3}$를 표면처리한 ${Y_2}{O_3}$:Eu 적색 형광체의 발광 특성)

  • 김봉철;이춘엽;송윤호;서경수;이진호;이남양;김동국;박이순;이병교
    • Journal of the Korean Ceramic Society
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    • v.38 no.12
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    • pp.1115-1122
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    • 2001
  • The tendency of the miximum brightness of $Y_2$O$_3$:Eu phosphor with various activator concentration, by different surface treatment methods as well as different exciting energies were investigated. The surface treatment methods were the adsorption method used $\alpha$-Fe$_2$O$_3$powder prepared emulsion-drying process and the precipitation method used FeSO$_4$/ethanol. Eu concentration of maximum brightness of $Y_2$O$_3$:Eu phosphor prepared by solid-solid state was changed with various exciting energies. The concentrations were 0.02 mol at VUV(147 nm) as well as 400 V and 0.03 mol at 5 kV. The phosphor treated both by adsorption method and precipitation method showed decreasing luminescent intensity with increasing amount of $\alpha$-Fe$_2$O$_3$, and the methods are chosen by exciting energy. Adsorption method was effective in a low voltage and VUV(147nm) region, and precipitation method was effective in the high voltage region.

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Effect of Ultraviolet Irradiation on Molecular Properties of Ovalbumin (자외선 조사가 Ovalbumin의 분자적 성질에 미치는 영향)

  • Cho, Yong-Sik;Song, Kyung-Bin;Yamada, Koji;Han, Gui-Jung
    • Applied Biological Chemistry
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    • v.51 no.4
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    • pp.276-280
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    • 2008
  • To elucidate the effects of ultraviolet (UV) irradiation on molecular properties of ovalbumin, the molecular weight profile, secondary structure and tertiary structure of proteins were examined after irradiation by UV with 254 nm wavelength for 4, 8, 16 and 32 hrs, respectively. UV irradiation of protein solution caused the disruption on the native state of protein molecules. SDS-PAGE and gel permeation chromatography indicated that radiation caused initial fragmentation of polypeptide chains and as a result subsequent aggregation due to cross-linking of protein molecules. Circular dichroism (CD) study showed that UV irradiation caused the change on the secondary structure resulting in decrease of helical structure or compact denature on structure of protein depending on irradiation period. Fluorescence spectroscopy indicated that irradiation quenched the emission intensity excited at 280 nm. These results suggest that UV irradiation affect the molecular properties of ovalbumin and may have potential as a means to change the antigenicity of protein allergen.