All issues
Volume 25, Issue 6
Displaying 1-10 of 10 articles from this issue
- |<
- <
- 1
- >
- >|
-
Hisao OKA1997 Volume 25 Issue 6 Pages 403
Published: June 15, 1997
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (156K) -
Shozo YANAGIDA1997 Volume 25 Issue 6 Pages 404
Published: June 15, 1997
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (202K) -
Kazuhito HASHIMOTO, Ken-ichi ISHIBASHI, Akira FUJISHIMA1997 Volume 25 Issue 6 Pages 405-410
Published: June 15, 1997
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSOne of the basic tenets of photochemistry is that the driving force in a photochemical reaction is the quantized but very large energy of the photon. This means that even an extremely weak source of excitation light would give rise to a non-zero reaction rate. Let us consider the UV light existing in an indoor living environment. Its amount is very small, but each photon possesses an extremely large energy. If we have a system which could collect this weak UV light efficiently and then use it to drive photochemical reactions, most organic compounds could be burned in air at room temperature. This idea can be approached via TiO2 film photocatalysis in a reaction with an extremely low reactant concentration. One of the motivations for a study under such conditions is the desire to develop methods of purifying interior living and working environments using ambient light. The present report deals with the discovery that materials coated with photoactive TiO2 exhibit deodorizing, sterilizing and self-cleaning functions photochemically under ordinary room light illumination without using any reactive chemicals.View full abstractDownload PDF (1536K) -
Kei MURAKOSHI, Shozo YANAGIDA1997 Volume 25 Issue 6 Pages 411-416
Published: June 15, 1997
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSIn-situ EXAFS analysis of colloidal CdS and ZnS nanocrystallites in N, N-dimethylformamide (DMF) was performed to clarify their microscopic surface structure. Analyses revealed that CdS and ZnS nanocrystallites are stabilized by solvation of the oxygen atoms of DMF to the cadmium and zinc atoms on the surface of nanocrystallites, respectively. The solvated surface structure of CdS nanocrystallites was affected by the addition of pentafluorothiophenol or H2S to the system. In the system of ZnS nanocrystallite, the structural parameters, such as atomic distances and coordination numbers of the Zn-S and Zn-O shcll, depend on the coexistent counter anions dereived from the starting zinc salts. These characteristics were correlated to their catalytic activity for photoreduction of carbon dioxide to carbon monoxide or/and formate.View full abstractDownload PDF (1229K) -
Prashant V. KAMAT1997 Volume 25 Issue 6 Pages 417-424
Published: June 15, 1997
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSTransient absorption spectroscopy is convenient to probe the photophysical and photochemical effects of semiconductor nanoclusters and heterogeneous charge transfer events at the semiconductor interface. The fast kinetic spectroscopy not only enables the detection of photogenerated transients in the femtosecond to microsecond time domain, but also enables understanding of the photophysical and photochemical properties that are unique to semiconductor nanoclusters. For example, this technique has provided some useful kinetic and mechanistic information of size quantization effects, non-linear optical effects, electro and photochromic effects, photocurrent generation, photocatalysis and charge rectification properties of semiconductor nanoclusters. These properties are controlled by charge separation, charge trapping and heterogeneous charge transfer at the semiconductor interface under UV and visible light irradiation. Some recent developments in this area are presented here.View full abstractDownload PDF (1655K) -
Technology of Clean Hydrogen Fuel Production from Solar Light and WaterHironori ARAKAWA1997 Volume 25 Issue 6 Pages 425-430
Published: June 15, 1997
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSRecent progress in photocatalytic decomposition of water to H2 and O2 using semiconductor catalyst has been reviewed. It was found that Na2CO3 addition to Pt-TiO2 suspension in water promoted the stoichiometric decomposition of water extremely. This Na2CO3 addition method has proved to be very useful to accelerate water splitting over various kinds of oxide semiconductor catalysts. Finaly, it was demonstrated for the first time all over the world that water was decomposed efficiently as well as stoichiometrically to H2 and O2 by NiO-TiO2 catalyst and real solar UV light irradiation.View full abstractDownload PDF (1011K) -
Guang XU, Kan-ichi FUJII, Shigeru NAKAYAMA1997 Volume 25 Issue 6 Pages 431-433
Published: June 15, 1997
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSWe have studied experimentally a prism-external-cavity semiconductor laser system with a dispersion feedback. In the system, the longitudinal mode of a semiconductor laser can be tuned continuously over a small range of about 400MHz, and the linewidth of a single mode is about 60MHz. Tuning characteristics have been investigated as functions of injection current, external cavity length and feedback energy to the laser diode.View full abstractDownload PDF (504K) -
Masahiro UEDA, Mugen KAWAZU, Hiroshi SUGA, Tomio MATSUI1997 Volume 25 Issue 6 Pages 434-437
Published: June 15, 1997
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSLight scattering has been applied to a cloth weft counting system, which has been verified for an industrial use. A sheet-like laser light with the length, l, and width, w, is irradiated on the Moire pattern of cloth with the pitch, p. The best results have been obtained with d=(1/3)p-(1/2)p and l=5w-20w depending on the Moire pattern. The present system consists of semiconductor laser as a light source, PIN photodiode as a light detector, an amplifier, a digitizer (ΔV detector) to transform a pseudosine wave to a square wave, an electronic counter and a display. The accuracy of the system has been found to be above 99% under the best condition. The counting frequency of the cloth weft is above 10kHz to be enough for a practical use.View full abstractDownload PDF (951K) -
Satoshi KUBOTA, Yuji KATO, Shinichi ABE, Shinji ONODERA, Yosuke AKAMA, ...1997 Volume 25 Issue 6 Pages 438-441
Published: June 15, 1997
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA silver mirror reaction method has been proposed to obtain small-bore silver capillary tubes. The deposition process of silver layer is clarified both by SEM and loss spectrum analyses. A condition is obtained to realize silver hollow glass waveguides with small transmission losses for the infrared.View full abstractDownload PDF (983K) -
Koichi SHIMODA1997 Volume 25 Issue 6 Pages 442-446
Published: June 15, 1997
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (710K)
- |<
- <
- 1
- >
- >|