• Title, Summary, Keyword: photolysis

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Response-Improved Electrochromic Display Device Based on Organic Materials (고응답성 유기계 전기변색성 소자의 제작과 특성)

  • 권태선
    • Journal of the Korean Printing Society
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    • v.12 no.1
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    • pp.81.1-91
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    • 1994
  • Irradiation of aromatic diazonium salts resulted in an effcient elimination of nitrogen, yielding substitution products. This paper was not only studies about photolysis of aromatic diazonium with double salts but also coexistence of ion and radical when they was photolysis. Photolysis of aromatic diazonium was depend on excite wave length therefore photolysis products out put different absorption intensity such other. We also confirmed coexistence of ion and radical when they was accomplished photolysis. In case of BD, there are ion decomposition process about 90 percentage, decreased ion decomposition process the other side radical`s it was becomeing increased according to excite of short-wave length.

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The Orientation of CO in Heme Proteins Determined by Time-Resolved Mid-IR Spectroscopy: Anisotropy Correction for Finite Photolysis of an Optically Thick Sample

  • Lim, Man-Ho
    • Bulletin of the Korean Chemical Society
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    • v.23 no.6
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    • pp.865-872
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    • 2002
  • A systematic way of determining the equilibrium orientation of carbon monoxide (CO) in heme proteins using time-resolved polarized mid-IR spectroscopy is presented. The polarization anisotropy at pump-probe delay time of zero in the limit of zero photolysis and the angular distrbution function of CO are required to obtain the equilibrium orientation of CO. An approach is developed for determining the polarization anisotropy in the zero-photolysis limit from the anisotropy measured under finite photolysis conditions in an optically thick sample where the fraction of molecules photolyzed decreased as the pump pulse passes through and is absorbed by the sample. This approach is verified by measuring the polarization anisotropy of CO of carbonmonoxy myoglobin at various levels of photolysis. This method can be readily applied to other photoselection experiments determining precise angle between transition dipoles.

A Novel Oxidation Model with Photolysis for Degradation of Trichlorobenzenes (TCBs)

  • Kim, Jae-Hyoun
    • Environmental health and toxicology
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    • v.12 no.3_4
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    • pp.1-13
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    • 1997
  • First- and second-order kinetic oxidation rates of trichlorobenzenes (TCBs) were obtained and compared by a chemical activation system (CAS) which mimics mixed functional oxidase activity. The system consists of EDTA, ferrous sulfate, ascorbic acid, and $H_2O_2$ in potassium phosphdte buffer (monobasic at pH 7.4). The rate of transformation in CAS was enhanced in the presence and absence of catalase in the sequence 1, 2, 3-TCB < 1, 2, 4-TCB < 1, 3, 5-TCB. In general, the rates of degradation were greater in the test media with catalase. The effect of photolysis on the degradation of the TCBs with the CAS were examined. Sensitized photolysis with nitrite, Fenton's reagent, TiO$_2$ and triethylamine (TEA) studied in concert with the CAS demonstrated significant enhancement of the degradation rate of TCBs. Disappearance rates of TCBs in CAS with prior photolysis or prior photosensitization were at least 10-fold higher than the sum of the rate for each single experiment. This study proves that the combination of the CAS and photolysis can be used as a suitable technique for enhancing degradation of TCBs in aqueous systems.

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Photochemical and Thermal Reaction Mechanism for the Reaction of Carcinogenic Molecules and Food Reservatives (발암성 분자와 식품보존제의 광화학 및 열적 반응메카니즘)

  • 김민식;채기수;김갑순;성대동
    • The Korean Journal of Food And Nutrition
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    • v.11 no.3
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    • pp.267-271
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    • 1998
  • The photochemical carcinogenic reaction mechanism and molecular carcinogenic intensity through the reaction of dibromo carbene and diazomethane with dehydroacetic acid and coumarin have been studied under the two kinds of photolysis. The reaction intensities show the degree of carcinogenic activity. Under the condition of UV/vis light source, the yield of high toxic carcinogenetic carbene intermediate is produced less than those of the laser flash photolysis.

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Photolytic Characteristics of TiO2 Treated by Atmospheric Pressure Dielectric Barrier Discharge (대기압 유전체배리어 방전으로 표면처리된 TiO2 분말의 광분해 특성)

  • Kang, Jeong A;Kim, Yoon Kee
    • Korean Journal of Materials Research
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    • v.26 no.8
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    • pp.406-411
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    • 2016
  • In order to reuse the photocatalyst and enhance the photolysis efficiency, we have used atmospheric pressure dielectric barrier discharge (APDBD) to clean and activate $TiO_2$ powder. The photocatalytic activity of the $TiO_2$ powder before and after APDBD treatment was evaluated by the degradation of methylene blue (MB) in aqueous solution. The apparent reaction rate constant of photolysis of the first sample of reused $TiO_2$ cleaned by APDBD improved to a level up to 0.32h-1 higher than the 30 % value of the initial $TiO_2$ powder. As the number of photolysis reactions and APDBD cleanings increased, the apparent rate constants gradually decreased; however, the fourth photolysis reaction still showed a value that was greater than 10% of the initial value. In addition, APDBD treatment enhanced the process by which $TiO_2$ effectively adsorbed MB at every photolysis stage.

Anthracene-Sensitized Photolysis of Onium Tetrakis(Pentafluorophenyl) Borate Cationic Photoinitiators

  • Yasumasa Toba;Midori Saito
    • Journal of Photoscience
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    • v.5 no.3
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    • pp.111-120
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    • 1998
  • Sensitized photolysis of two onium borates (diphenyliodoium and dimethylphenacylsulfonium tetrakis(pentafluorophenyl)borate, 1a and 2a , respectively) and cationic photopolymerization of an epoxy monomer by the photolysis were investigate. The onium borates were sensitized by the excited singlet of the athracenes(non-substituted, 9-methyl-and 9, 10-dimethylanthracene) and generated acid by decomposing teemselves. The quantum yields of photobleaching of the anthracenes($\Phi$-AH) and acid generatiion (øacid) by the onium borates were the same order as those of the corresponding onium salts in aerated solutions (methanol and acetoitrile) and in argon(Ar) saturated acetonitrile. However, in the photolysis of the iodonium borates 1a in Ar saturated MeOH , øacid was much higher than the corresponding ø-AH. The acid generated by the photolysis of the onium borates initiated cationic polymerization of an epoxy monomer. The values of both rate of polymerization (Rp) and degree of conversion on the photopolymerization for the iodonium borated 1a were higher than those of the sulfoium borate 2a. In the photopolymerization for the iodonium borate 1a, both the Rp value and the degree of conversinio increased upon the addition of glycerol as a hydrogen donor. It is suggested that the increase of both values may be caused with the increase of øacid by addition of glycerol.

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Photodegradation and Degradation Product of Piperophos (Piperophos의 광분해 및 분해생성물에 대한 연구)

  • 민경진
    • Journal of Food Hygiene and Safety
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    • v.19 no.2
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    • pp.97-103
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    • 2004
  • The present study was performed to investigate photodegradation rate constants and degradation products of piperophos by the USEPA method. The pesticide was very stable in 16 days exposure of sunlight from October 3 to 22, 2003 and humic acid had no sensitizing effect on the photolysis of each pesticide in sunlight. In the UV irradiation test, piperophos was rapidly degraded as increasing UV intensity. In case of UV irradiation with TiO$_2$ and with TiO$_2$ powder amount, degradation of piperophos was slower than UV irradiation. In order to identify photolysis product, the extracts of degradation product was analyzed by GC/MS. The mass spectrum of photolysis product of piperophos was at m/z 166. It was suggested that the photolysis products of piperophos was O, O-dipropyl phosphorodithioate.

The Study of VOCs Decomposition Characteristics Using UV Photolysis Process (휘발성유기화합물의 광분해 제거 특성에 관한 연구)

  • 서정민;정창훈
    • Journal of Environmental Science International
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    • v.11 no.7
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    • pp.743-748
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    • 2002
  • UV photolysis process is little known in parts of air pollution treatment, so there are not many applications in field. Therefore we have to do more experiment and study application possibility for treatment of VOCs(Volatile organic compounds). To solve these problems, we have been studying for simultaneous application of this technology. It has shown that concentration of TCE and B.T.X., diameter of reactor and wavelength of lamp have effected on decomposition efficiency. Analysis of TCE and B.T.X. concentration was carried out by GC-FID. A cylinderical reactor consisting of a quartz tube and a centrally located lamp(${\psi}25mm$) was used. The length and diameter of reactor were 1800mm, 75mm. It has shown that the generated ozone concentration goes up 250ppm when using 64watt ozone lamp. When using Photolysis process only, the rates of fractional conversion of each material are TCE 79%, Benzene 65%, Toluene 68%, Xylene 76%. This phenomenon can be rationalized in terms of the different bond energy that indicates how easily VOCs species can be decomposed.

Nanosecond Laser Flash Photolysis Study of 5-Styryl-1,3-dimethyluracil

  • Shim Sang Chul;Shin Eun Ju;Chae Kyu Ho
    • Bulletin of the Korean Chemical Society
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    • v.6 no.4
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    • pp.234-238
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    • 1985
  • The photoisomerization of 5-styryl-1,3-dimethyluracil is studied with nanosecond laser flash photolysis technique at room temperature. The laser flash photolysis of E-isomer produces the transient absorption spectrum regarded as the triplet-triplet absorption, but the transient absorption of Z-isomer does not show the typical decay curve, probably due to the facile photocyclization reaction during the laser flash photolysis. Using the energy transfer method on nanosecond laser spectroscopy, the energy of the lowest triplet state for E isomer is estimated to lie between 41.8 and 47 kcal/mol. The triplet lifetime for E-isomer obtained from the decay curve of the transient absorption is ca. 93ns. The $S_1 → T_1$ intersystem crossing of E-isomer on direct excitation is relatively inefficient at room temperature supporting the singlet mechanism for direct photoisomerization.

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