巻号一覧
50 巻, 4 号
選択された号の論文の8件中1～8を表示しています
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塩沢 猛公1987 年 50 巻 4 号 p. 265
発行日: 1987/08/28
公開日: 2011/08/11
ジャーナル フリーPDF形式でダウンロード (2145K) -
井浜 三樹男, 金田 卓爾, 谷 忠昭1987 年 50 巻 4 号 p. 267-273
発行日: 1987/08/28
公開日: 2011/08/11
ジャーナル フリーIn the previous paper, the authors have proposed that cyanine dyes exhibit desensitization in a sulfur-sensitized cubic AgBr emulsion by enhancing the dispersion of latent images. The electron lifetime in unsensitized cubic AgBr grains was proportional to the square of their edge length, supporting Kaneda model. Namely, the electron lifetime was determined by the reaction of a trapped electron with an interstitial silver ion. The degree of the decrease in electron lifetime due to sulfur sensitization was increased by cyanine dyes. This result indicates that the reaction of a photoelectron with an interstitial silver ion was enhanced by both sulfur sensitization and cyanine dyes, and that cyanine dyes could enhance the dispersion of latent images by accelerating the nucleation process of latent image formation.抄録全体を表示PDF形式でダウンロード (769K) -
Toshio TANAKA, Masashi IWASAKI1987 年 50 巻 4 号 p. 274-280
発行日: 1987/08/28
公開日: 2011/08/11
ジャーナル フリーTransient J-aggregation of 1, 1'-diethy1-2, 2'-cyanine chloride (Dye 1) from dilute aqueous solutions catalyzed by nascent ultrafine silver bromide particles has been studied by a stoppedflow multichannel spectrophotometry in which Dye 1 solutions containing potassium bromide are mixed with dilute silver perchlorate solutions in a rapid solution mixing device and the time-resolved absorption spectra of the mixtures are recorded at intervals of 10-100 ms. Decay of monomer absorption band of the dye occurred immediately after solution mixing, with concurrent growth of a transient J-band. The rate of this process was larger at lower temperatures and paralleled the rate of silver bromide nucleation, indicating that the latter was the rate-determining step. The reaction order of the catalyzed J-aggregation was 2-3 when it was determined from the dependence on dye concentration of the growth rate of the J-band, while it was a little larger than unity when determined from the decay rate of the monomer band. These suggest that the adsorption of Dye 1 molecules to silver bromide surface as monomers competes with the catalyzed J-aggregation. At higher silver bromide concentrations, monomer adsorption preceded J-aggregation, the latter being probably a surface process. The J-band under such conditions was broad and blue-shifted by about 10 nm.抄録全体を表示PDF形式でダウンロード (974K) -
須田 美彦, 松坂 昌司1987 年 50 巻 4 号 p. 281-286
発行日: 1987/08/28
公開日: 2011/08/11
ジャーナル フリーThe adsorption of oxacarbocyanines on silver halide microcrystals was studied. A point of discontinuity was observed in the adsorption isotherm of 5, 5'-dichloro-9-ethyloxacarbocyanine on AgBr microcrystals. At this point, the adsorption state changed from monomer to J-aggregate. The equilibrium concentration decreased with increasing amount of the dye adsorbed in J-aggregate; this suggests the existence of a large interaction between adsorbed molecules. Lowering the equilibrium concentration resulted in decomposition and desorption of J-aggregate, while the dye molecule adsorbed in monomer state was not desorbed.
Formation of J-aggregate is facilitated by substituting 5-chlorine to 5-phenyl of oxacarbocyanine, on the surface of silver halide containing iodine, or by lowering the methanol content of solution. The occurrence of an intermolecular interaction between different kinds of oxacarbocyanines was verified.抄録全体を表示PDF形式でダウンロード (783K) -
野原 秀憲, 中村 賢市郎1987 年 50 巻 4 号 p. 287-293
発行日: 1987/08/28
公開日: 2011/08/11
ジャーナル フリーDirect detection of electrons transferred from excited photographic dyes was attempted by measuring photoinduced currents. Multilayered cells composed of a dye, an electron donor and an acceptor were constructed by evaporating them on a glass plate. Four cyanine dyes (Cy) as electron generating agents, triethanolamine hydrochloride (TEDA·HCl) and anilinehydrochloride (An·HCl) as donors, and methylviologen dichloride (MV) as an acceptor were employed for assembling the multi-layered cells. The photocurrent spectra were well coincided with the absorption spectra of cyanine dyes. The direction of current observed indicates that electrons are transferred from an excited dye to the acceptor. Evaporated AgBr also acts as an acceptor. The energy levels of the compounds employed were determined by measuring electrochemical redox potentials. The energy diagram obtained supports theelectron transfer mechanism from the excited dye to the acceptor. Thus, electrons transferred from excited dyes to the acceptor molecules (AgBr or MV) could be observed directly by measuring photoinduced current of the evaporated cells.抄録全体を表示PDF形式でダウンロード (843K) -
米沢 義朗, 大野 雅史, 綿谷 和浩, 菅 貞治, 羽田 宏1987 年 50 巻 4 号 p. 294-304
発行日: 1987/08/28
公開日: 2011/08/11
ジャーナル フリーMonolayers containing a novel Rhodamine B dye having two long N-alkyl chains were formed at air-water interfaces and transferred to the surface of SiO2, SnO2, and Au substrates by the Langmuir-Blodgett (LB) technique. The single-photon counting method was used to investigate the fluorescence decay of Rhodamine B in the LB films whose absorption and emission spectra were measured by a conventional manner. The fluorescence lifetime nearly equal to the natural lifetime of Rhodamine B was observed in the LB films in which the average distance of chromophores was about 10Å. Concentration quenching of the fluorescence of Rhodamine B in the LB films was not so distinct as that reported in the adsorbed dye films by a number of research groups even at high surface dye concentration. It appears that LB films containing the novel Rhodamine B dye are particularly useful for the study of dynamics of excited dye molecules, because they are superior in many aspects homogeneity and reproducibility of dye layers, to the adsorbed dye films. Electrontransfer quenching of the fluorescence in the presence of a quencher (N, N'-dioctadecyl viologen), as well as at the surface of solid substrates capable of accepting electrons from the excited dye molecules (SnO2, Au), was examined and the results were interpreted in terms of electronic redox levels of dye, quencher and the energy bands of the solids抄録全体を表示PDF形式でダウンロード (1497K) -
大谷 博史1987 年 50 巻 4 号 p. 305-309
発行日: 1987/08/28
公開日: 2011/08/11
ジャーナル フリーUsing a mode-locked argon-ion laser and a time-correlated single-photon-counting detection system, the mechanism of supersensitization was explored with regard to the characteristics of light-induced electrons and holes in sensitizing dyes.
In an optically excited supersensitized system, the fluorescence lifetime of a sensitizing dye adsorbed on AgBr microcrystals was shortened.
Owing to hole trapping by a supersensitizer, electron transfer efficiency from a dye to AgBr microcrystals was found to be increase in the supersensitized systems examined.抄録全体を表示PDF形式でダウンロード (600K) -
1987 年 50 巻 4 号 p. 314-320
発行日: 1987/08/28
公開日: 2011/08/11
ジャーナル フリーPDF形式でダウンロード (1054K)
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