Bulletin of The Society of Scientific Photography of Japan
Online ISSN : 1884-6335
ISSN-L : 0038-0059
Volume 1967, Issue 17
Displaying 1-6 of 6 articles from this issue
  • Tadaaki TANI, Shinichi KIKUCHI
    1967 Volume 1967 Issue 17 Pages 1-11
    Published: 1967
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    Nature of the interaction between silver bromide grains and photographic sensitizing and desensitizing dye molecules was examined on the basis of visible and infrared absorption spectra of adsorbed dyes on silver bromide grains. And, it has been found that photographic dyes interact with the surface of silver bromide grains by van der Waals' forces and the electrostatic force. Then, the experimental method was designed to examine the influence of imperfections of silver bromide grains on the energy or electron transfer from excited dye molecules to silver bromide grains, i.e., spectral sensitization in photography. And, in this work, no evidence was obtained for the presence of the influence of imperfections of silver bromide grains on spectral sensitization of the photographic process.
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  • Hidemaru SAKAI, Shigeji BABA
    1967 Volume 1967 Issue 17 Pages 12-23
    Published: 1967
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    Desensitizing effect of rhodium chloride on silver halide emulsion and its exposure intensity dependence were compared with those of rhodium nitrate and pinacryptol yellow. Rhodium chloride shows powerfull desensitizing effect at either high or low intensity exposure, but pinacryptol yellow is effective only at low intensity exposure. The similar exposure intensity dependence was observed on the solarization promoted by rhodium chloride and pinacryptol yellow. The chemically fogged emulsion containing rhodium chloride is solarized at high or low intensity exposure, however pinacryptol yellow can not promote the solarization at high intensity exposure. Rhodium nitrate gives little influence on the photographic emulsions.
    For observation of the behavior of rhodium chloride in the emulsion, the contents of rhodium and X-ray diffraction of the silver chloride precipitated in presence of rhodium chloride, and polarographic reduction potential of rhodium chloride were determined. The results suggest that the desensitizing effect of rhodium chloride is due to electron trapping by rhodium ions occupying lattice points of silver halide. It may be considered that rhodium ion in silver halide more quickly captures photoelectron near the released point of electron than pina cryptol yellow adsorbed on the grain surface.
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  • Tadaaki TANI, Shinichi KIKUCHI
    1967 Volume 1967 Issue 17 Pages 24-34
    Published: 1967
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    The nature of interaction between the surface of zinc oxide grains and adsorbed dye molecules has been examined by measuring the amount of adsorbed dyes, adsorption isotherm, heat of adsorption and visible reflection spectra of adsorbed dyes on zinc oxide grains. It has been found that the adsorption of xanthene dyes to zinc oxide grains is caused by the coulombic force and also by van der Waals' forces, and that the coulombic force arises from the localized electrostatic interaction between carbonyl groups of the adsorbed dye molecule and zinc ions at the surface of zinc oxide grains. It has been also found that dyes in the molecular state mainly take part in spectral sensitization of photoconductivity of zinc oxide grains. Then, the authors have examined the possibility that the small amount of dyes strongly affected by imperfections of zinc oxide grains have large influences on the electron or energy transfer from the optically excited dyes to zinc oxide grains, i.e., spectral sensitization, by use of the experimental method designed in the previous work. No evidence was obtained for the presence of the influence of imperfections of zinc oxide grains on spectral sensitization of their photoconductivity. Based on these results, the relation between adsorbability and sensitizing power of photosensitive dyes for zinc oxide grains has been examined, and the dye with the strong adsorbability has been found to show the strong sensitizing power. This result is thought to support the electron transfer mechanism for spectral sensitization of photoconductivity of zinc oxide grains.
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  • Toshio ABE, Kohichi NAKAMURA
    1967 Volume 1967 Issue 17 Pages 35-40
    Published: 1967
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    A photoelectric densitometer which can record automatically characteristic curves of photosensitive materials has been devised. This densitometer can read on constant pitch scale for density reading from 0.0 to 4.0 on transmission or reflection measurement with a set of interference-type narrow band filters which have peak at 435, 546 and 644 m, u respectively, in conformance with ASA. The output signal of photomultiplier has a constant value to changing of the density of specimen by a servo mechanism and a logarithmic attenuator. As a relation between the density of specimen and the position of attenuator is complementary, optical density is possible to record with constant pitch on the Y axis of XY recorder which is built in this densitometer. The circuit elements of this densitometer are all transistors to minimize the instrument.
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  • Masaaki SUGIURA, Etsuo FUJII
    1967 Volume 1967 Issue 17 Pages 41-46
    Published: 1967
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    The adsorption of polyethylene glycol from solution on the surface of suspended silver iodide has been studied by means of the measurement of the electrophoresis of silver iodide sols in the presence of polyethylene glycol having various molecular weight ranging from 200 to 9000. The charge densities of the silver iodide sols containing polyethylen glycol were estimated from their electriphoretic mobilities, and the adsorption was discussed from the changes in the charge densities by the application of Simha's theory on polymer adsorption. From the result of the discussion, it became clear that the polyethylene glycol molecule adsorbs on the surface of silver iodide with three segments for molecular weight of 9000, two segments for molecular weight of 2000 and one segment for molecular weight of 1500, respectively.
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  • 1967 Volume 1967 Issue 17 Pages 47-66
    Published: 1967
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
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