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Table of Content

    20 February 2000, Volume 18 Issue 1
    STUDY ON THE PREPARATION AND PROPERTY OF NOVEL HOLLOW GRAIN SILVER HALIDE EMULSIONS Ⅵ. THE PREPARATION AND PHOTOGRAPHIC PROPERTY OF HOLLOW GRAIN CUBIC SILVER HALIDE EMULSIONS
    HUANG Kai, LI Jinpei, WANG Su’e
    2000, 18(1):  1-6.  DOI: 10.7517/j.issn.1674-0475.2000.01.1
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    The hollow cubic silver halide microcrystals were prepared. The relation between structure and property of the hollow cubic microcrystal emulsions was studied by means of surface development and chemical sensitization. The results show that the latent image is always formed preferentially around the holes of the hollow cubic silver halide microcrystals. Compared with solid cubic AgBr and AgBrCl emulsions, the hollow cubic grain emulsion has higher surface reaction activity and higher sensitivity. The advantages of hollow cubic silver halide microcrystals can be ascribed to their unique hole structure.
    STUDY ON THE PHOTOCATALYTIC DEGRADATION OF PHOSPHATE ESTER PESTICIDES
    CHEN Shifu, LIANG Xin, TAO Yuewu, ZHAO Mengyue
    2000, 18(1):  7-11.  DOI: 10.7517/j.issn.1674-0475.2000.01.7
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    The photocatalytic degradation of phosphate ester pesticides using TiO2/beads as a photocatalyst was studied. The results showed that the photocatalytic degradation reaction of the phosphate ester pesticides followed the first order kinetics, with 4 0×10-4 mol/L of dichlorvos and monocrotophos, the residual amount was lower than 10% after 1.5 h irradiation with a 375 W medium pressure mercury lamp, and the organophosphorous can be completely photocatalytically degraded into PO43- after 3.5 h irradiation.
    STUDY ON CONFORMATIONAL CHANGE OF BINARY ANIONIC ACRYLAMIDE COPOLYMERS(P3A) BY VISCOSIMETRY AND SPECTROMETRY IN DIFFERENT pH AQUEOUS SOLUTION
    ZHU Linyong, CHANG Zhiying, LI Miaozhen, WANG Erjian
    2000, 18(1):  12-17.  DOI: 10.7517/j.issn.1674-0475.2000.01.12
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    The pH induced conformational change of the binary anionic monomers and acrylamide terpolymer(P3A) composed of the non-ionic monomer acrylamide(AM), strong-acidic monomer 2-acrylamide-2-methylpropane-sulfonate(AMPS) and weak-acidic monomer(AA) were studied in dilute aqueous solution by viscosimetry and spectrometry. The results obtained show that the solution viscosity of P3A increases non monotonousily with pH values and a dramatic enhancement occurs in the range of pH 4~5, which is attributed to the rapid transition from compact to expanded state of the polymer chain. The intensity of viscosity changes between the two states is closely related with the fraction of AMPS and AA in the polymer. The pH dependence of the fluorescence intensity of pyrene probe in P3A solution shows a similar result as viscosity. At low pH the phase separation was observed in the solution of(P2AA) copolymer composed of single weak acidic unit(AA), but it does not occur in case of(P3A) polymers containing strong acidic unit(AMPS). Therefore, different acid-resistant and pH-responsive P3A polymers can be constructed by controlling the fraction of two ions units(AMPS and AA) in polymer chains as desired for practical application.
    POSITRON CHEMISTRY OF THE DEVELOPMENT MECHANISM
    GONG Zhufang, ZHANG Yiheng, JIANG Zhiquan, XU Xuguo, YAN Tiantang, YU Shuqin, ZHUANG Siyong, PENG Bixian
    2000, 18(1):  18-24.  DOI: 10.7517/j.issn.1674-0475.2000.01.18
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    The mechanism of action of free volume holes in photographic gelatin in developing processes was investigated by Positron Annihilation Technique(PAT) for the first time. In this work, a new mechanism has been proposed to account for the formation of silver thread in development. The application of PAT has introduced a new research technology and method into photographic science. The results showed that the average radius of free volume holes maintained constant on the whole in development. The free volume holes in gelatin may restrain the process of the silver ion to be reduced to silver atom in the space of the different electron cloud density, therefor the production and deposition of silver atom occurred in filamentary form. The free volume holes distributed over photographic gelatin macromolecule confusedly because of the complexity in structure and component. It is probably the confusion that leads to loose spatial structure of silver needle twisting into balls.
    PHOTOINDUCED ALTERNATING POLYMERIZATION OF VINYL SPIRO ORTHOESTER(VS) WITH MALEIC ANHYDRIDE
    ZHENG Zushuang, WU Feipeng, LI Miaozhen, WANG Erjian
    2000, 18(1):  25-30.  DOI: 10.7517/j.issn.1674-0475.2000.01.25
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    Photoinduced copolymerization of vinyl spiro orthoester(VS)-(2-methylene-1,4,6-trioxaspiro[4,4] nonane)with maleic anhydride(MA) proceeds via formation of the charge transfer(CT) complex as reactive intermediate to produce linearly alternating copolymer, poly(VS-alt-MA) by vinyl type radical polymerization way. It was found that in the mild condition the photopolymeriztion occurs only in the present of radical photoinitiator. The solvent polarity and feed ratio of two monomers significantly affect the polymerization rate, but does not effect on the composition of polymer products. The formation CT complex between VS and MA was further verified by UV absorption spectra. The association constant(K) of CT complex was estimated to be 0.22 mol-1·L (THF) and 0.19 mol-1·L(CH3CN).The small value of K indicates that VS and MA interact to construct a weak CT complex, which is easily affected by polarity of solvents and temperature. The structure of VS/MA copolymer obtained was further determined by IR and 1HNMR spectra. The results measured clearly demonstrated that the copolymer product possesses a regular alternating structure with original trioxaspiro ring at VS unit in polymer chain. The mechanism of radical alternating photopolymerization of VS with MA was also discussed.
    SPECTRAL INVESTIGATION ON THE INTERACTION OF A CYANINE DYE AND AgCl PARTICLES IN REVERSED MICELLES
    ZHANG Zhiying, LIU Chunyan
    2000, 18(1):  31-35.  DOI: 10.7517/j.issn.1674-0475.2000.01.31
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    The interaction between AgCl nanoparticles with radii of 11~14 nm and cyanine dye is studied in different reversed micelles composed of an anionic or nonionic surfactant. The adsorption of the cyanine dye on the surface of AgCl nanoparticles and the fluorescence quenching by the AgCl nanoparticles are also discussed.
    THE PHOTO ISOMERIZATION REACTION OF BIS(BENZOXADYL) STILBENE(Ⅱ) THE EFFECT ON THE SOLVENT POLARITY
    JIANG Yongcai, WU Shikang
    2000, 18(1):  36-41.  DOI: 10.7517/j.issn.1674-0475.2000.01.36
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    The problem of photophysics, spectrum and photo-isomerization of bis(benzoxadyl) stilbene in different solvents were studied carefully. On the base of fluorescence quantum yield and lifetime measurement, the rate constants of radiation decay and non-radiation decay of this compound were calculated. It was found that in polar solvent the high fluorescence quantum yield was observed and the high rate of photo-isomerization was occured in the non polar solvents. The activation energy of photo-isomerization from trans-to cis-isomer of this compound was also measured in this work. Results obtained were discussed preliminary.
    HIGH CONTRAST CAUSED BY SEVERAL INHIBITORS ON SILVER HALIDE CTP PRINTING PLATE
    ZHOU Shuyun, CHEN Ping, HU Xiujie, ZHENG Deshui
    2000, 18(1):  42-50.  DOI: 10.7517/j.issn.1674-0475.2000.01.42
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    High contrast is essential for printing plate technology. In this paper, four inhibitors were introduced into developers for silver halide diffusion transfer system. Their effects on contrast were studied at different concentration of inhibitors by applying CCD technique. It was found that thiosalicylic acid improved the contrast at a wide range of concentration; 2-mercaptobenzithiazole improved the contrast at higher concentration; 6-nitro-benzimidazole and benzotriazole can slightly improve the contrast. And a super-high contrast was obtained when 6-nitro-benzimidazole and thiosalicylic acid were used together. The contrast coefficients were calculated for each inhibitor. An explanation based on development kinetic curves was proposed.
    THE INTRAMOLECULAR PHOTOINDUCED ELECTRON TRANSFER OF MULTI PODAL OPEN CHAIN COMPOUNDS AND EFFECT OF pH VALUES ON THEIR FLUORESCENCE
    XIE Hongzhi, YI Shan, WU Shikang
    2000, 18(1):  51-57.  DOI: 10.7517/j.issn.1674-0475.2000.01.51
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    A kind of open chain compounds, containing tri-, di- or mono-naphthylurea substituted amines, were synthesized in this work. It is found that the photophysical behaviors of these compounds in DMF solution strongly depend on the structure and the fluorescence intensity of tripodal compound if affected by the acidity of solution. In the same time, apparent intramolecular photoinduced electron transfer(PET) of the tripodal compound with a tertiary amine group was found, resulting in self-quenching of excited state of this compound. Furthermore, this process can be well reduced by protonation of nitrogen of the tertiary amine group of tripodal compound.
    DESIGN AND SYNTHESIS OF A DIAZA-18-CROWN-6-SUBSTITUTED ANTHRAQUINONE SUPRAMOLECULAR SYSTEM AND INTRAMOLECULAR ENERGY TRANSFER
    LI Hui, XU Huijun, ZHOU Qingfu
    2000, 18(1):  58-62.  DOI: 10.7517/j.issn.1674-0475.2000.01.58
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    N-(2-methyl-anthraquinone)diaza-18-crown-6 was designed and synthesized. Photophysical properties of the coordination compound between the crown compound as ligand and europium ion was investigated. Selective excitation to the charge transfer band between the ligand and Eu(Ⅲ) emission from Eu(Ⅲ) ion was observed indicating that intramolecular energy transfer from the excited singlet of the ligand to Eu(Ⅲ) ion occurred. Luminescence decay measurement showed that encapsulation of Eu(Ⅲ) ion into the cavity of the crown moiety does not completely shield the Eu(Ⅲ) ion from interaction with solvent molecules since three water molecules are still coordinated to Eu(Ⅲ) ion in the Eu(AQ-CW)(NO3)3·3H2O consistent with elemental analysis.
    SYNTHESES AND PROPERTIES OF A NEW ELECTROLUMINESCENCE MOLECULE
    XUE Minzhao, HUANG Deyin, LIU Yangang
    2000, 18(1):  63-66.  DOI: 10.7517/j.issn.1674-0475.2000.01.63
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    A new stilbene derivative containing triphenylamine segment (TPS) was synthesized. Photochemical and electrochemical properties were also studied. The results showed that TPS was a convenient hole-transport and emission material when used with Alq3 as emission material and with PBD as electron-transport material respectively.
    A STUDY ON THE INCLUSION BEHAVIOR OF COUMARIN DERIVATIVES IN β-CYCLODEXTRIN
    DAI Zhaohua, WU Shikang
    2000, 18(1):  67-72.  DOI: 10.7517/j.issn.1674-0475.2000.01.67
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    The spectral behaviors of a series of coumarins in water with different concentrations of β-cyclodextrin were studied in this work. It has been found that β-cyclodextrin’s inclusion capacity to these coumarins is closely related to their structural and substitution features. The influence of the polarity of the internal cavity of β-cyclodextrin on coumarins’ spectra corresponds with the degree of coumarins’ intramolecular charge transfer. The formation of hydrogen bonds between -OH,-NH2 substituted coumarin derivatives and β-cyclodextrin acts as an obstacle to inclusion. Because the size of β-cyclodextrin is definite, it is of great importance for good inclusion to take place that the size of the guest molecule match that of β-cyclodextrin.
    TRIPLET ENERGY TRANSFER IN NOVEL NAPHTHALIMIDE FERROCENE DYAD SYSTEMS
    WANG Zhaohui, YAO Side, CHEN Kongchang, TIAN He
    2000, 18(1):  73-76.  DOI: 10.7517/j.issn.1674-0475.2000.01.73
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    The triplet state of naphthalimide was investigated by nanosecond laser flash photolysis technique. The quenching of the triplet state of naphthalimide unit by ferrocene were observed for the naphthalimide-ferrocene dyad systems and the mixture of naphthalimide and ferrocene in acetonitrile. The results indicated that there exist the effective triplet energy transfer processes from naphthalimide to ferrocene.
    2000, 18(1):  77-84.  DOI: 10.7517/j.issn.1674-0475.2000.01.77
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    2000, 18(1):  85-94.  DOI: 10.7517/j.issn.1674-0475.2000.01.85
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