All issues
Volume 45 (1982)
- Issue 6 Pages 409-
- Issue 5 Pages 333-
- Issue 4 Pages 251-
- Issue 3 Pages 145-
- Issue 2 Pages 73-
- Issue 1 Pages 1-
Volume 45, Issue 2
Displaying 1-7 of 7 articles from this issue
- |<
- <
- 1
- >
- >|
-
1982 Volume 45 Issue 2 Pages 73
Published: April 28, 1982
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSDownload PDF (3076K) -
Photoresponse of Acid and Na salt type Triphenylmethane Dyed Zinc OxideYoung Soon KIM, Yasusuke TAKAHASHI, Toshibumi SAKATA1982 Volume 45 Issue 2 Pages 75-84
Published: April 28, 1982
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSSurface photovoltage measurements was employed for studying the sensitization mechanism of triphenylmethane dyes from the relationships of the adsorption state of dye molecules on zinc oxide powder surfaces. In the case of the acid type dyes of triphenylmethanes, experimental curves agree well with the theoretical results of light intensity dependences of photovoltage Vp and d Vp/dt. It is found that the acid type dye adsorption on zinc oxide unaffects to zinc oxide intrinsic photoresponse. On the other hand, the Na salt type dye adsorption on zinc oxide shows the desensitization for zinc oxide intrinsic photoresponse, because the adsorbed molecules of the ground state attribute to recombination process of the free carriers photo-generated in zinc oxide bulk. It is concluded that the carboxylic or sulfonic radical of dyes will be mainly attracted to adsorption sites. And the mechanism of dye sensitization on zinc oxide surface is proposed that the electrons of excited dyes is mainly transferred to conduction band through the hydroxyl radical.View full abstractDownload PDF (1148K) -
Comparison of 2-isopropoxy substituted and 2-methyl substituted 1, 4-naphthoquinonesKatsuhiko TANAKA, Hiroshi KOKADO1982 Volume 45 Issue 2 Pages 85-90
Published: April 28, 1982
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSPhotochemical behaviors of 2-isopropoxy-1, 4-naphthoquinone (IPNQ) which has an intramolecular hydrogen donor adjacent to one of its carbonyl oxygens, have been investigated in cellulose acetate film, and compared with those of 2-methyl-1, 4-naphthoquinone (MNQ) which has no intramolecular hydrogen donor.
The quantum yield of photoreduction in film increased by addition of benzhydrol which served as a hydrogen donor but leveled off at 0.5 for both IPNQ and MNQ. When no benzhydrol was present, however, the quantum yield was 0.3 for IPNQ, three times larger than that for MNQ. For photographic applications, it dose not seem to be necessary to add hydrogen donors to IPNQ.
Photo-generated reductants from quinones undergo air oxidation. The reaction was pseudounimolecular as to the concentration of reductants, with the rate constants 1.0×10-4 min-1 and 4.8×10-4 min-1, or with the half-lives 115 hr and 24 hr, for IPNQ and MNQ at 20°C, respectively. The activation energy was measured for IPNQ and found to be 12 kcal/mol. The frequency factor was as small as 103, suggesting that the latent image consisting of reductants are relatively stable against the variation of storage temperature.View full abstractDownload PDF (802K) -
Yoshiro YONEZAWA, Yasuhito MOMOKI, Hatsumi TANEMURA, Hiroshi HADA1982 Volume 45 Issue 2 Pages 91-97
Published: April 28, 1982
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSPhotographic density and the amount of reduced silver of semiconductor-Ag+ plates have been measured for varying exposure to UV-light. The observed quantum yields of Ag+ reduction are in a similar magnitude to those in semiconductor-Ag+ aqueous suspensions. Both the rate of increase of photographic density and the quantum yield increase with the amount of Ag+ contained in the plates. These results can be interpreted by the concept of semiconductor electrochemistry. It is proposed that measurements of surface photovoltage and photocurrent are useful for judging the photochemical sensitivity of the plates.View full abstractDownload PDF (905K) -
Kazuo NAGAE, Kenichiro NAKAMURA, Masako SASAKI, Toshibumi SAKATA1982 Volume 45 Issue 2 Pages 98-103
Published: April 28, 1982
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSA new method was introduced in order to improve accuracy of color matching by using the Kubelka-Munk theory. In the color matching calculation, experimental spectral reflection data of mixed colorants were adopted with those of originals, and both separated scattering coefficients and absorption coefficients derived from the K/S value were taken into consideration.
The spectral color matching calculation was carried out with a weight value at each wavelength. Satisfactory results were obtained in the calculation for the color samples specified in Japan Industrial Standards for Color Rendering Properties (JIS-Z-8726). Advantages of this method are that the calculated result is fairly coincident with the sample data obtained experimentally from the calculated mixing ratio, and that the matched data have wide rendering tendency for different color tempera tures of light sources.View full abstractDownload PDF (646K) -
Hiroshi ITO1982 Volume 45 Issue 2 Pages 104-109
Published: April 28, 1982
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSDownload PDF (2541K) -
Shunji MURAI1982 Volume 45 Issue 2 Pages 110-116
Published: April 28, 1982
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSDownload PDF (17643K)
- |<
- <
- 1
- >
- >|