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Volume 59 (1996)
- Issue 6 Pages 672-
- Issue 5 Pages 582-
- Issue 4 Pages 489-
- Issue 3 Pages 385-
- Issue 2 Pages 276-
- Issue 1 Pages 105-
Volume 59, Issue 6
Displaying 1-7 of 7 articles from this issue
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Susumu KUWABATA, Hiroshi YONEYAMA1996 Volume 59 Issue 6 Pages 672-679
Published: December 25, 1996
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSPreparation of the electronically conducting polymer film, polyaniline, having an ability of light image formations is reviewed. This purpose was achieved by incorporation of photosensitive materials into the polymer film. Methylene blue of a redox dye was successfully incorporated into the film with assistant of Nafion polymer which was used as a supporting electrolyte. Photoinduced reduction of the incorporated methylene blue to colorless leuco methylene blue caused in an aqueous acid solution containing ascorbic acid as a reducing agent was found to be enhanced if Ru (bpy) 32+ was further incorporated together with methylene blue in the film as a photosensitizer. The photoreduction was occurred at the illuminated area alone, giving formation of light images. The incorporation of semiconductor particles such as TiO2, W03, and CdS was succeeded by electrochemical oxidation of aniline from the deposition bath containing the suspended semiconductor particles. The semiconductor particles incorporated in the polyaniline film possessed capabilities to reduce polyaniline when the film was irradiated in aqueous and non-aqueous solutions containing methanol as a hole scavenger. Formation of light images of high resolution was produced if the film was subjected to deprotonation prior to the light- illumination. In this case, protons generated by photooxidation of the hole scavenger and photoexited electrons generated in the semiconductor particles were found to be involved in the photoreduction of the polyaniline, giving desirable circumstances that induced photoreduction at the illuminated area alone.View full abstractDownload PDF (4949K) -
Tomokazu IYODA, Tetsuyuki SAIKA, Rong WANG1996 Volume 59 Issue 6 Pages 680-689
Published: December 25, 1996
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSRecent progress in molecular functional materials is described in terms of multifunctionalization and ordered assembly. Multi- mode chemical transducer is introduced as an example of the former and the latter is demonstrated using azobenzene derivative ultra- thin film.View full abstractDownload PDF (7357K) -
Yukio OKANO1996 Volume 59 Issue 6 Pages 690-698
Published: December 25, 1996
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSColor image enhancement is performed by digital filtering process. The characteristics of digitized photographs are processed by the large convolution kernels (1×21) to control the low frequency components.
MTF curves are selected to change the imaging properties. The processed images are subjectively evaluated. The most preferable MTF values exist in the low spatial frequency region. In color portrait photography, slightly low sharpness image concerning skin tone area is preferable for human observation.View full abstractDownload PDF (4956K) -
Yuji KUBO1996 Volume 59 Issue 6 Pages 699-704
Published: December 25, 1996
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSThis paper describes our recent achievements in developing synthetic chromogenic receptors which are characterized by combined “recognition” and “optical sensing” functions. The focus is on preparation and some intriguing properties of two kinds of azomethine- derived calixarenes. One that incorporates an indoaniline- type chromophore shows a UO22+- induced bathochromic shift of ca. 60nm as a result of selective complexation, suggesting that it may be useful as a colorimetric sensor for UO22+ ion detection. The other one, bis (indophenol)- derivative also exhibits pronounced color changes by 'structure- selective' acid- base reactions with butylamines.View full abstractDownload PDF (702K) -
Kieko HARADA, Masahito KUSHIDA, Kazuyuki SUGITA1996 Volume 59 Issue 6 Pages 705-710
Published: December 25, 1996
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSPhotosensitive p- N, N- dimethylamino-benzenediazonium chloride double salts (DZn) is applied to a visible light emission film-phototackifiable film- for multicolor phosphor screens. The emission intensity of the phosphor screen increased by addition of 18- crown- 6. The coordination of 18- crown-6 to zinc ion was detected by FTIR spectrophotometry. The hygroscopic property of zinc chloride in the film was suppressed by coordination of 18- crown-6 to zinc ion. Therefore, zinc chloride was prevented from coloring and the emitted light was able to transmit so much increasingly through the phosphored matrix film. For these reasons, relative emission intensity of the film containing 18- crown-6 complex was larger than that of the film without 18- crown- 6. Photolysis of DZn in the photo- tackifiable film with 18- crown- 6 was accelerated at an elevated temperature, under which condition diazonium moiety was dissociated from the complex with the crown.View full abstractDownload PDF (675K) -
Masashi IWASAKI, Takashi SAIMOTO, Toshio TANAKA1996 Volume 59 Issue 6 Pages 711-717
Published: December 25, 1996
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSEarly stage of precipitation of silver iodide containing silver bromide was studied by multichannel spectrophotometry. Time-dependent absorption spectra of mixed silver halide hydrosols were argued in conjunction with the halide composition of the samples. Silver bromoiodide hydrosols, which eventually formed pure silver iodide crystalline phase partially, did not show the 407 nm absorption peak characteristic of pure silver iodide clusters. It was concluded that pure silver iodide crystalline phase did not exist in the early stage of precipitation in such hydrosols. Coexistence of bromide ion in iodide ion solution before precipitation affected the aggregation of silver iodide clusters considerably because of the different ion species adsorbed to them.View full abstractDownload PDF (866K) -
Photolysis of TriphenylacetonitrileKazuo OTA, Takeshi UENO1996 Volume 59 Issue 6 Pages 718-728
Published: December 25, 1996
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSPhotolysis of triphenylacetonitrile (TPAN) dissolved in cyclohexane was studied in O2 or in N2 atmosphere. The mixtures of photochemical products were concentrated and separated by TLC. From the products in O2 atmosphere, 2- biphenyl- phenylacetonitrile (K4), cyanophenyl- diphenylmethane (K3), K2 (unknown) and biphenyl (K1) were found. From the products in N2 atmosphere, entirely same compounds as those in O2 atmosphere were found.
For clarifing in photochemical decomposition pathway of TPAN, another photolysis using each three photoproducts (K3, K2 and K4) was carried out. Furthermore, the photochemical products of TPAN at intermediate process were analyzed by thin layer chromatoscanner.
From their results, the following decomposition pathway was proposed.View full abstractDownload PDF (1185K)
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