Enhancement of the oxidation of hydrogen-t in oxygen atmosphere by ultraviolet photons

Usami, Shiro; Asai, Yasutaka; Matsuyama, Masao; Watanabe, Kuniaki

doi:10.1021/es00074a019

Cited by 5 publications

(3 citation statements)

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“…When the interfacial thickness between the membrane and the dispersing medium is finite, a term proportional to exp(− s 2 q 2 ) is multiplied by P ( q ) in eqs 1−3 at large q , where s denotes an index of the surface thickness . The refractive indices of DOP, the poly(urea-urethane) network, and aqueous solution are 1.49, 1.58, and 1.33, respectively. If the polymer network wall does not swell, these values correspond to n i , n m , and n o , respectively.…”

Section: Methodsmentioning

confidence: 99%

Determination of the Swelling Ratio of Poly(Urea-urethane) Microcapsules by Single-Particle Light Scattering

et al. 2001

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The thickness δ of microcapsules consisting of a dioctyl phthalate core and an outer poly(urea-urethane) membrane has been determined by means of single-particle light scattering and the freeze-fracture method in combination with electron microscopy as a function of the dioctyl phthalate/wall-forming triisocyanate monomer volume ratio φ. The thickness δ increased nonlinearly with decreasing φ. The swelling ratio of the membrane was determined to be 1.2 in the range φ < 3, which was explained by the relatively low plasticizing effect of dioctyl phthalate.

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Section: Methodsmentioning

confidence: 99%

Determination of the Swelling Ratio of Poly(Urea-urethane) Microcapsules by Single-Particle Light Scattering

et al. 2001

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“…The characteristic features of this figure are: 1) the concentration of TCI HT oxidation [7][8][9]. Namely, there was no autocatalytic feature.…”

Section: Resultsmentioning

confidence: 91%

“…We have previously reported that irradiation of a gas mixture of H 2 (HT) and O 2 by ultraviolet photons enhances the rate of HTO formation by 1400 times [7] in comparison with that of ß rayinduced radiochemical HTO formation, namely the gas phase reaction without a catalyst or UV irradiation. This phenomenon was designated as the UV-stimulated HT oxidation [8,9], The rate of HTO formation in the UV-stimulated reaction is proportional to the pressure of O 2 , molar fraction of HT with respect to total hydrogen pressure (H 2 +HT), and square root of the total pressure [8].…”

Section: Introductionmentioning

confidence: 99%

Acceleration of the UV‐stimulated HT oxidation by CCl₄

Hasegawa

Fusumae

Miyahara

et al. 1994

Journal of Environmental Science and Health . Part A: Environme

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The effects of air pollutants on UV-stimulated HT oxidation were studied by selecting CCl 4 as a model pollutant. Mixture gases consisting of H 2 +HT, O 2 and CCl 4 were irradiated with a high pressure mercury lamp. The reaction products were found to be HTO and TCl. The role of CCl 4 was evaluated by measuring the formation rate of HTO+TCl as a function of the partial pressure of CCl 4 . The reaction took place in two stages. During the first stage, the extent of the reaction increased almost linearly with time. During the second stage, the rate became faster with time, showing a similar feature to 282 HASEGAWA ET AL.autocatalytic reactions. It was found that those rates were considerably increased with the pressure of CCl 4 . In the case of 1.0 Torr, the rate of the first stage was 60 times greater than that of the UV-stimulated HT oxidation previously reported, and that of the second stage was about 10 times that of the first stage. As a whole, the CCl 4 -assisted UV-stimulated HT oxidation showed a 5×10 4 -5×10 5 times greater reaction rate than the ß ray-induced radiochemical HT oxidation. With the aid of computer simulation including 47 relevant elementary reactions, the enhanced acceleration of the reaction was understood as a result of the formation of new reaction paths such as Cl H HO 2 H 2 O and Cl H HO 2 OH H 2 O, which lacked in the UV-stimulated HT oxidation mechanism.

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Overview of Tritium Work in Japan

1992

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Enhancement of the oxidation of hydrogen-t in oxygen atmosphere by ultraviolet photons

Cited by 5 publications

References 5 publications

Determination of the Swelling Ratio of Poly(Urea-urethane) Microcapsules by Single-Particle Light Scattering

Determination of the Swelling Ratio of Poly(Urea-urethane) Microcapsules by Single-Particle Light Scattering

Acceleration of the UV‐stimulated HT oxidation by CCl₄

Overview of Tritium Work in Japan

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Enhancement of the oxidation of hydrogen-t in oxygen atmosphere by ultraviolet photons

Cited by 5 publications

References 5 publications

Determination of the Swelling Ratio of Poly(Urea-urethane) Microcapsules by Single-Particle Light Scattering

Determination of the Swelling Ratio of Poly(Urea-urethane) Microcapsules by Single-Particle Light Scattering

Acceleration of the UV‐stimulated HT oxidation by CCl4

Overview of Tritium Work in Japan

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Acceleration of the UV‐stimulated HT oxidation by CCl₄