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    Visible Light Photoredox Catalysis in Trifluoromethylation Reactions
    ZENG Tingting, XUAN Jun, CHEN Jiarong, LU Liangqiu, XIAO Wenjing
    Imaging Science and Photochemistry    2014, 32 (5): 415-432.   DOI: 10.7517/j.issn.1674-0475.2014.05.415
    Abstract5656)      PDF (8203KB)(3301)       Save

    Perfluoroalkylation, especially trifluoromethylation has long been a hot research area in synthetic organic chemistry. In addition, visible light photoredox catalytic organic transformations have attracted great attention due to their inherent green feature. Recently, visible light photoredox catalysis has been successfully applied to a series of trifluoromethylation reactions. In this review, we will highlight the recent advancement in this field and organize the review article according to trifluoromethyl sources.

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    Imaging Science and Photochemistry    1987, 5 (2): 34-38.   DOI: 10.7517/j.issn.1674-0475.1987.02.34
    Abstract4499)      PDF (279KB)(1325)       Save
    The fluorescence lifetimes of nine complexes of Eu3+ with β-diketone-L 4EuQH have been studied by laser induced spectrofluorometer. Results show that the fluorescence lifetimes of L 4EuQH with a given Q, measured at the peaks of 6130 Å, 5910 Å and 5797 Å, are the same, on the other hand, the influence of Q on the fluorescence lifetimes of L 4EuQH may be caused by H-bond.
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    Synthesis of Ethylene Glycol Diglycidyl Ether and Study on Its Properties as Cationic Type UV-Curing Diluent
    LIU Shi-min, HUANG Bi-wu, CHENG Gui-liang
    Imaging Science and Photochemistry    2011, 29 (6): 456-463.   DOI: 10.7517/j.issn.1674-0475.2011.06.456
    Abstract3118)      PDF (731KB)(2694)       Save
    Ethylene glycol diglycidyl ether was synthesized with ethylene glycol and epichlorohydrin as raw materials,with boron trifluoride ether complex as the catalyst,and with sodium hydroxide as the closed ring agent of producing ring reaction.The effects of the closed ring temperature,the dosage of the catalyst,the moral ratio of epichlorohydrin to ethylene glycol,and the moral ratio of sodium hydroxide to ethylene glycol on the reaction were studied,which showed that the preferable synthesizing conditions are 0.40% of the catalyst mass fraction,the moral ratio 2.4:1 of epichlorohydrin to ethylene glycol,the moral ratio 2.2:1 of sodium hydroxide to ethylene glycol,and 30℃ of the closed ring reaction temperature.Meanwhile,the cationic type UV-curing coating was prepared with ethylene glycol diglycidyl ether,epoxy resin (E-51) and triphenylsulphonium hexafluoroantimonate (UVI-6976).The mechanical properties of the UV-cured films were determined,giving 46.25 MPa of tensile strength,1487.26 MPa of Young’s modulus and 6.27% of elongation at tear.
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    Research on the Holographic Recording Characteristics and Applications of a Panchromatic Photopolymer
    WEI Ming-bin, LI Ze-ren, XIE Bang, WANG Gui-xi, ZHU Jian-hua
    Imaging Science and Photochemistry    2012, 30 (1): 26-32.   DOI: 10.7517/j.issn.1674-0475.2012.01.26
    Abstract2820)      PDF (2045KB)(1787)       Save
    By selecting Methylene blue, Eosin Y and Acridine Orange as red-, green- and blue-sensitive photosensitizers respectively, a water-soluble panchromatic photopolymer is fabricated successfully. This material has high diffraction efficiency (over 90%) and high photosensitivity (~70 mJ/cm 2) for three primary color lasers. Angular and wavelength multiplexing holograms are successfully recorded in the same location of the panchromatic photopolymer, the reconstructed multicolor images are clear and bright, and there is no obvious crosstalk between them. The experimental results show that this panchromatic photopolymer material has good holographic recording characteristics and application prospects.
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    Preparation Hydrophobic Graphene Aqueous Dispersion and Electrochemical Properties
    KIM Song-hun, LI Dan-dan, LI Jiu-ming, YU Yuan, LI Yu-zhen, ZHI Jin-fang
    Imaging Science and Photochemistry    2012, 30 (4): 280-288.   DOI: 10.7517/j.issn.1674-0475.2012.04.280
    Abstract2741)      PDF (1252KB)(2119)       Save
    The direct dispersion of hydrophobic graphene sheets in water without the assistant of surfactant stabilizers has recently been recognized as an important task for production of individual graphene sheets. We developed a facial method to disperse hydrophobic graphene sheets in aqueous medium through enlarging the amount of hydrazine-hydrate in the absence of surfactant or any other foreign electrostatic stabilization agents. Homogeneous aqueous graphene dispersion had produced lower zeta potential of more negative than -32.5 mV at solution pH of 5.89 and was stable for six months without any precipitate. The folded individual single-layer graphene sheets with 0.38 nm layer thick and the formation of a hexagonal crystalline graphene structure were observed from AFM and TEM images, respectively. XPS analysis showed the efficient reduction of graphene oxide. As-prepared graphene-glassy carbon electrode (GE-GCE) showed a relatively sensitive electrochemical response toward the detection of AA and UA than glassy carbon electrode (GCE).
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    Recent Progress of Tetraphenylethenes with Aggregation-Induced Emission
    XIA Jing, WU Yan-mei, ZHANG Ya-ling, TONG Bing, SHI Jian-bing, ZHI Jun-ge, DONG Yu-ping
    Imaging Science and Photochemistry    2012, 30 (1): 9-25.   DOI: 10.7517/j.issn.1674-0475.2012.01.9
    Abstract2719)      PDF (1278KB)(2142)       Save
    Among the novel organic molecules with aggregation-induced emission (AIE), tetraphenylethenes (TPEs) enjoy the advantages of facile synthesis and efficient solid-state emission as well as high thermal stability. This review mainly focuses on the AIE properties of TPEs with the aspect of hydrophilicity or hydrophobicity.The relationship between TPEs' structures and AIE properties was explained. The application as bio- and chemo-sensors was introduced. Finally, a brief outlook on the design of new AIE-active TPEs and the application of them in relevant fields is forwarded.
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    Evolution and Progress of I-Line Photoresist Materials
    ZHENG Jin-hong
    Imaging Science and Photochemistry    2012, 30 (2): 81-90.   DOI: 10.7517/j.issn.1674-0475.2012.02.81
    Abstract2713)      PDF (1204KB)(3108)       Save
    Novolak-diazonaphthoquinone photoresists have been widely used in g-line、i-line lithography for its high performance. Although g-line and i-line photoresists are both consisted of novolak resin and diazonaphthoquinone photoactive compounds,in order to fit i-line exposure wavelength and seeking for higher resolution, novolak resin and photoactive compounds(PAC) both have difference in structure from g-line to i-line.In i-line resist,the o-o'bonding content of resin is higher, the esterfication of PAC is higher, the proximity of DNQ groups is distant. Dissolution promoter is an important component of i-line resists, some phenolic additives were very useful to control the dissolution behavior.
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    Progress in Preparation of Functional Films by Spin-Coating
    WANG Dong, LIU Hong-ying, HE Jun-hui, LIU Lin-lin
    Imaging Science and Photochemistry    2012, 30 (2): 91-101.   DOI: 10.7517/j.issn.1674-0475.2012.02.91
    Abstract2676)      PDF (1595KB)(4055)       Save
    Spin-coating, as one of thin film preparation methods, has advantages of precise thickness control, high cost performance, energy saving, low pollution, etc. Thin films fabricated by spin-coating are widely applied in the areas of microelectronics, nanophotonics, biology, medicine, etc. In this paper, fundamental processes and estimation methodologies of key parameters for spin-coating are briefly introduced. Then a range of advanced applications and recent progresses of spin-coating technology within several disciplines are reviewed, including optics, microelectronics, etc. Finally, the developing trend of spin-coating technology is also discussed.
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    The Preparation of UV Curable Hard Coatings on PET
    LU Jian-bo
    Imaging Science and Photochemistry    2011, 29 (6): 449-455.   DOI: 10.7517/j.issn.1674-0475.2011.06.449
    Abstract2642)      PDF (683KB)(2307)       Save
    An ultraviolet curable transparent hard coating material has been developed to improve the abrasion resistance of PET.Functionalized polyurethane acrylate was used for the preparation of the hard coatings by UV curable technique.Factors that influence the properties of the PET hard coating were investigated,which includes photosensitive resin,reactive diluents,photoinitiator and additives.The tested results showed that: The prepared coating hardness 5H,adhesion 100%,abrasion resistance tested with the RCA tapes (500 g,1000 cycles),the transmittance of PET film without loss,as well as low surface tension,excellent flexibility and good chemical resistance.
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    Fluorescent Chemodosimeters for Mercury(Ⅱ) Ions Detection
    HUANG Wen-jun, WU Wen-hui
    Imaging Science and Photochemistry    2011, 29 (5): 321-335.   DOI: 10.7517/j.issn.1674-0475.2011.05.321
    Abstract2471)      PDF (1479KB)(1727)       Save
    The development of fluorescent chemodosimeters has recently emerged as an active research area of significant importance.Chemodosimeters are used to detect an analyte through a highly selective and usually irreversible chemical reaction between the dosimeter molecule and the target analyte with high sensitivity and rapid response.Herein,we reviewed the literatures of the last few years covering the chemodosimetric approach for detecting mercury(Ⅱ) ions.
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    Effects of Ca 2+ and Ba 2+ Ions on Sensitometric Properties and Stability of Photothermographic Material
    LIN Hai-li, CAO Jing, YAO Lin-hui, XIA Pei-jie, LI Jin-pei
    Imaging Science and Photochemistry    2005, 23 (5): 367-373.   DOI: 10.7517/j.issn.1674-0475.2005.05.367
    Abstract2417)      PDF (291KB)(1422)       Save
    The effects of Ca 2+, Ba 2+ ion on sensitometric properties and aging stability of PTG materials, using AgSt as silver sources, ex-situ formed AgBr as photosensitive component, and PVA as binder, were investigated. The results showed that the sensitivity and the fog of PTG materials were all decreased at different degrees when adding Ca 2+ or Ba 2+ to system before coating, and sensitivity was debased quickly with the increase of percentage of Ca 2+ or Ba 2+. In addition, the changing trend of the sensitivity and the fog of PTG materials which contained Ca 2+ was not consistent with that of Ba 2+ as the aging time went on.
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    Organic Optoelectronic Materials for Trace Explosive Sensing
    ZHANG Cheng-yi, ZANG Ling
    Imaging Science and Photochemistry    2012, 30 (3): 161-174.   DOI: 10.7517/j.issn.1674-0475.2012.03.161
    Abstract2391)      PDF (1747KB)(2377)       Save
    Detection of trace explosives is of great concern for homeland security, battlefield protection, and industrial and environmental safety control. Fluorescence quenching based sensing has proven to be one of the most promising approaches for trace explosives detection. This review is focused on examples reported by Porf. Ling Zang's group and Prof. William Trogler's group related to fluorescence quenching sensors based on one-dimensional small molecular nanomaterials, fluorescent coordination polymers (or metal-organic frameworks) and polysiloles. It is also introduced the use of organic semiconductors, such as phthalocyanine thin films and perylene diimide nanowires, to construct electronic sensors for trace explosive sensing.
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    Molecular Structure of Advanced Photoresists
    XU Jian, CHEN Li, TIAN Kai-jun, HU Rui, LI Sha-yu, WANG Shuang-qing, YANG Guo-qiang
    Imaging Science and Photochemistry    2011, 29 (6): 417-429.   DOI: 10.7517/j.issn.1674-0475.2011.06.417
    Abstract2381)      PDF (1420KB)(3725)       Save
    This article reviews the development of lithography technology and photoresists as well as their molecular structure for 193 nm and extreme ultravioletlithography (EUVL,the next generation lithography).Especially,we describe the recent research and development of EUV photoresists in detail for the purpose of being conducive to the domestic research on advanced photoresists.
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    Preparation and Properties of Low Molecular Weight Polyacrylate Acrylic Resin Containing Carboxylic Group
    OU Xiao-wei, NIE Jun, HE Yong
    Imaging Science and Photochemistry    2010, 28 (3): 182-192.   DOI: 10.7517/j.issn.1674-0475.2010.03.182
    Abstract2320)      PDF (1154KB)(1317)       Save
    A kind of low molecular weight polyacrylate acrylic resin (PAAR) containing carboxyl group was synthesized through simple method with high conversion and good mechanical and physical properties of cured film.Its main chain was prepared through copolymerization of alkylacrylate and acrylic acid and the result indicated that when methyl acrylate,ethyl acrylate and acrylic acid (molar ration 1:1:1) were used as monomers,with 1.5% initiator AIBN,2.5% chain transfer agent dodecanethiol,the molecular weight of polyacrylate (PA) was between 1100-1400 with the polydispersity index less than 2.Through esterification reaction between this kind of PA with Glycidyl methacrylete (GMA),the final product PAAR was obtained with more than 90% esterification conversion,and UV cured film exhibited satisfied hardness,glossy and flexibility.
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    Review and Prospect of Imaging Technology
    YAN Lei, JING Xin, YANG Bin
    Imaging Science and Photochemistry    2012, 30 (4): 241-250.   DOI: 10.7517/j.issn.1674-0475.2012.04.241
    Abstract2307)      PDF (2478KB)(2042)       Save
    This paper expounds the three stages ofimaging technology history: electronic machinery, automation and digital stage,including the transition from film type to magnetic recording one, the compatibility between film type and digital type, and the frontier technology of spatial resolution, radiometric resolution, spectral resolution and temporal resolution of digital imaging. We also put forward an automatic control theory for image processing from parts to system, and expound future tendency of imaging technology.
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    Synthesis, Characterization and Spectral Properties of Novel Meso-Substituted Heptamethine Cyanine Dye
    CHEN Xiu-ying, GUO Lin, JIA Xian-lin, GAO Hai-yan, ZHENG Chang-ge
    Imaging Science and Photochemistry    2012, (5): 375-383.   DOI: 10.7517/j.issn.1674-0475.2012.05.375
    Abstract2268)      PDF (783KB)(1621)       Save
    Two novel meso-substituted heptamethine cyanine dyes were prepared and characterized by 1HNMR and HRMS spectra. The absorption and emission spectral properties in different solvents were studied. The maxima of the absorption and fluorescent spectra of the dyes 3b and 3c were at 677/790 nm and 647/786 nm in methanol respectively with larger stokes shifts of 113 nm and 139 nm. The photo-degradation reaction showed that the rate constants for the three dyes 3a-3c were 1.21?10 -3 mol/min, 1.81?10 -3 mol/min and 2.14?10 -3 mol/min respectively. Cyclic voltammetry showed that the oxidative potentials for 3a-3c were 0.729 V, 0.624 V and 0.598 V respectively. The experiment of photodegradation showed that electron-withdrawing group on methine chain of heptamethine cyanine dye enhanced the photostability and electron-donating group on methine chain decreased the photostability of the dyes. The ability of donating and withdrawing affected the photostability of the dyes. The hydrogen bond on substituted atom on methine chain was favor for enhancing the photostability of the dyes. And hydrogen bond of chlorine atom on methine chain was in favor of enhancing the photostability of the dyes. But nitrogen atom on methine chain can not form hydrogen bond and not helpful for the photostability of the dyes.
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    ZOU Xiao-bing, MENG Gang, ZHENG Ze-gen, CHEN Li-juan, PENG Bi-xian
    Imaging Science and Photochemistry    2002, 20 (3): 219-229.   DOI: 10.7517/j.issn.1674-0475.2002.03.219
    Abstract2188)      PDF (1527KB)(2606)       Save
    This paper is a review about waste water treatment of gelatin plant with 38 references.The research work and treatment technology about gelatin product waste water are described from aspects of flocculation,biochemistry,sludge,clean technology,protein recovery and environment health.
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    Progresses on Sensitization of Cationic Photoinitiators
    ZHANG Hong, LI Jian-xiong, LIU An-hua
    Imaging Science and Photochemistry    2013, 31 (1): 69-78.   DOI: 10.7517/j.issn.1674-0475.2013.01.009
    Abstract2157)      PDF (1060KB)(3789)       Save
    The curing rate and quantum efficiency of cationic photoinitiators are relatively low because the UV absorption of the photoinitiators ranges from 250 nm to 300 nm normally and does not match with the wavelength of light from UV light sources. To make the absorption red-shift, many efforts have been devoted onto the photosensitization of the photoinitiators. The achievements on the sensitization of the cationic photoinitiators have been summarized here. The sensitization is mainly based on the mechanisms as energy transfer, oxidation of free radical,electron transfer via exciplexes and addition fragmentation reaction. The methods adopted for the sensitization include adding photosensitizer,expanding molecular conjugation and attaching chromophore. The development of the photoinitiators and photosensitizers has been outlined and the applications of novel cationic photoinitiators and photosensitizers have been forecasted.
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    ZHAO Hong-li, YUAN Hui-hui, LAN Min-bo
    Imaging Science and Photochemistry    2003, 21 (3): 212-222.   DOI: 10.7517/j.issn.1674-0475.2003.03.212
    Abstract2128)      PDF (1804KB)(2745)       Save
    Cyanine dyes and related compounds have dominated the field of photography and other sophisticated areas of dye application more than one hundred years.Recently,they are widely used in the field of biological and medical research.This paper concerns research on cyanine dyes and related compounds carried out in recent years focus on their application as fluorescent probes for biological systems and as antitumor agents for photodynamic therapy(PDT).
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    A Hybrid Reduction Procedure for Preparing Flexible Transparent Graphene Films with Improved Electrical Properties
    KIM Song-hun, LI Dan-dan, YU Yuan, XU Tao, QIAN Jun, ZHI Jin-fang
    Imaging Science and Photochemistry    2012, 30 (4): 289-298.   DOI: 10.7517/j.issn.1674-0475.2012.04.289
    Abstract2097)      PDF (1670KB)(1972)       Save
    A novel procedure for producing flexible transparent conductive Graphene films was reported. The synthetic procedure includes a solution-processed chemical reduction and an anodized aluminum oxide (AAO) membrane filter-assisted for thermal reduction. Final flexible transparent graphene films produced by this method exhibited the sheet resistance less than 850 Ω/square with 80% transmittance under visible-light irradiation (wavelengths: 540-840 nm). This sheet resistance value is close to that of the graphene films obtained from CVD method (280-770 Ω/square), and is much lower than that of the graphene films obtained from solution process (usually, in 10 3-10 4Ω/square).
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    Applications and Syntheses of Polyhydroxystyrene in Deep UV Photoresist
    LIU Jian-guo, ZHENG Jia-shen, LI Ping
    Imaging Science and Photochemistry    2006, 24 (1): 67-74.   DOI: 10.7517/j.issn.1674-0475.2006.01.67
    Abstract2082)      PDF (2637KB)(1910)       Save
    The previous development processes, current application status and some latest progresses of polyhydroxystyrene(PHS) used as base matrix rasin in deep ultraviolet photoresist were mainly reviewed. The syntheses of monomer derivatives and polymers of PHS were also discussed.
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    Imaging Science and Photochemistry    1995, 13 (4): 366-370.   DOI: 10.7517/j.issn.1674-0475.1995.04.366
    Abstract2062)      PDF (336KB)(3139)       Save
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    Influences of Deposition Potential on ZnS Thin Films Prepared by Electrodeposition Technique
    XIA Dong-lin, LEI Pan, SHI Zheng-zhong, XU Jun
    Imaging Science and Photochemistry    2012, 30 (2): 129-133.   DOI: 10.7517/j.issn.1674-0475.2012.02.129
    Abstract2036)      PDF (664KB)(1872)       Save
    ZnS thin films were deposited on ITO glasses by electrodeposition. The microstructure and surface morphology of thin films were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM), UV-Vis spectrophotometer was used to evaluate the optical properties of thin films. Effects of deposition potential on the microstructure and optoelectronic properties of ZnS thin films were studied, and the results showed that ZnS thin films were amorphous when the deposition potential changed from 1.5 V to 1.7 V, and the visible transmittance of thin films gradually decreased from 60% to 20% with the deposition potential increasing from 1.5 V to 1.7 V. The optical bandgap of ZnS thin film is about 3.97 eV. The thin film was crystalline with metal Zn existing in the films and the visible transmittance of thin films markedly decreased under the deposition potential was 2.0 V.
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    Hydrothermal Synthesis of Tungsten Trioxide with Different Morphologies and their Application in Water Treatment
    HAN Wen-mei, HE Jun-hui
    Imaging Science and Photochemistry    2012, 30 (3): 216-227.   DOI: 10.7517/j.issn.1674-0475.2012.03.216
    Abstract2020)      PDF (1977KB)(1777)       Save
    Tungsten trioxide (WO 3) with narrow band gap, becomes a promising n-type semiconductor photocatalyst after titanium dioxide (TiO 2). In this work, WO 3 nanostructures were synthesized by hydrothermal method. Different morphologies and crystalline structures could be obtained by tailoring reaction parameters, such as precursor composition and precipitation time, etc. The as-prepared WO 3 products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), and N 2 adsorption-desorption. The precursor composition and precipitation time were found to largely affect the morphology and crystalline structure of WO 3 nanostructures. The obtained WO 3 products were applied for the removal of methylene blue in aqueous solution. It showed that all the obtained WO 3 nanostructures exhibited high activities for the removal of methylene blue, and 97 % of methylene blue could be removed.
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    Synthesis of GelMA/PEGDA Hydrogel by UV Photopolymerization
    WANG Yihu, ZHANG Bing, MA Ming, LU Weipeng, WANG Jianing, GUO Yanchuan
    Imaging Science and Photochemistry    2017, 35 (4): 574-580.   DOI: 10.7517/j.issn.1674-0475.2017.04.019
    Abstract2015)      PDF (3220KB)(2390)       Save

    To avoid the thermolability of physically cross-linked gelatin hydrogel and toxicity of chemically cross-linked gelatin hydrogel, double bonds were introduced to gelatin molecule chain by acrylation, and then gelatin methacrylamide(GelMA) and polyethylence glycol diacrylate(PEGDA) were cross-linked to hydrogels by the UV photopolymerization. The relationship between the quantity of methacrylic anhydride(MA) and degree of modification and physicochemical properties of GelMA/PEGDA were investigated and analyzed. The result indicated that more radicals could be released in the system when more PEGDA were added. So the activity and extent of crosslinking reaction was increased and hydrogel with much denser 3D network was formed. Cross-linked GelMA/PEGDA hydrogel have better thermal stability than cross-linked GelMA at 37 ℃. Cross-linked GelMA/PEGDA hydrogel can be used as scaffold materials of tissue engineering.

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    Dissolving and Electro-Chemical Deposition of Copper Phthalocyanine
    QIAN Ling-feng, ZHANG Jia, XUE Min-zhao, ZHU Yuan-yuan, ZHANG Qing, LIU Yan-gang
    Imaging Science and Photochemistry    2011, 29 (2): 114-122.   DOI: 10.7517/j.issn.1674-0475.2011.02.114
    Abstract1969)      PDF (1827KB)(3371)       Save
    In order to obtain the ideal Copper Phthalocyanine(CuPc) film from organic solution,first,we studied the solubility of CuPc in different solvents,and the effect of various amounts of trifluoroacetic acid(TFAA) to CuPc;Second,we fabricated CuPc films with different electro-chemical deposition conditions,and discussed the changes of the surface morphology.Then using the UV-Vis to measure the spectrum of copper phthalocyanine(CuPc) in four different organic solvents;using the scanning electron microscopy(SEM) to observe the surface morphology of CuPc films.The results showed that: after adding TFAA,CuPc is easily dissolved in both nitro-methane and chloroform,but in chloroform,it is more easily protonated;the amount of TFAA and CuPc has great influence to the surface morphology.
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    The Research on Thermal Aging Yellowing of UV-Curing Material
    CAI Wan-po, WANG De-hai, SHENG Wei-ming
    Imaging Science and Photochemistry    2012, (5): 390-397.   DOI: 10.7517/j.issn.1674-0475.2012.05.390
    Abstract1956)      PDF (711KB)(2628)       Save
    The changing of yellowing factor of UV-curing material was monitored. The samples were added in different types and different proportion of antioxidants during thermal aging process to study the anti-yellowing effects of antioxidants and the different anti-yellowing ability of antioxidants. The UV-Vis spectrum was used to meter the transmittance of samples. The result shows that the antioxidant can reduce the yellowing degree during thermal aging process. The anti-yellowing ability of antioxidant is relative with the anti-yellowing ability of the hydroxyl in the antioxidant. There are synergistic effects in Irganox-1010/Irgafos-168 and Irganox-1076/Irgafos-168, and they show a better anti-yellowing effect than single antioxidant.
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    Synthesis and Structure Characterization of Coumarin Derivatives
    SUN Yi-feng, MA Shi-ying, ZHANG Dong-di, CHENG Xue-li
    Imaging Science and Photochemistry    2008, 26 (5): 393-402.   DOI: 10.7517/j.issn.1674-0475.2008.05.393
    Abstract1915)      PDF (1429KB)(1773)       Save
    Eleven new coumarin derivatives were prepared in 53% to 79% yields.The structures of the title compounds were characterized by elemental analysis, 1HNMR and MS.The crystal structure of donor-acceptor complex ABT-MCC derived from 2-amino-1,3-benzothiazole(ABT) and ethyl 8-mthoxycoumarin-3-carboxylate(MCC) was determined by X-ray diffraction analysis.The crystal of ABT-MCC belongs to the triclinic system,space group P 1,cell parameters: a=9.5978(19)Å, b=10.686(2)Å, c=10.693(2)Å,α=71.30(3)°,β=70.43(3)°,γ=88.99(3) °,V=973.9(3)Å 3, Z=2, Dx=1.359 mg/m 3, μ=0.200 mm -1, F(000)=416, R=0.0463, wR=0.0992.X-ray diffraction reveals that the complex shows the A…D…D’…A’ H-bonded tetramer.The molecules are connected via intermolecular hydrogen bonds into a one-dimensional chain structure,and are further assembled to form a layer structure via the π-π stacking.
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    Synthesis, Characterization and Photocatalytic Hydrogen Production of Water-Soluble Pt(II)-Salen Complex
    FAN Ren-jie, CHEN Yong, FU Wen-fu
    Imaging Science and Photochemistry    2012, 30 (6): 456-462.   DOI: 10.7517/j.issn.1674-0475.2012.06.456
    Abstract1848)      PDF (830KB)(1498)       Save
    A new water-soluble Pt(II) -Salen complex (Salen= NN'-substituted bis(salicyl-aldimine-5-sulphonic acid) potassium salt) was synthesized, characterized and employed in the photocatalytic hydrogen evolution system. In the presence of TEA, this system could produce hydrogen effectively without additional catalyst. An investigation found that the Pt(II) -Salen complex could be employed as photosensitizer. Besides, it could also be the precursor of the catalyst. In addition, there was not organic solvent except TEA in the hydrogen evolution system. The result provided a new way to simplify the multi-component system for photocatalytic hydrogen production.
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    Comparison of HDR Image Compression Algorithms
    LIU Zhen, YANG Dan-dan, ZHU Ming
    Imaging Science and Photochemistry    2011, 29 (1): 32-44.   DOI: 10.7517/j.issn.1674-0475.2011.01.32
    Abstract1845)      PDF (2323KB)(1855)       Save
    High Dynamic Range (HDR) images are very important method and have been widely used in many areas such as remote sensing,virtual reality,medical images,and cross-media publishing.But the restriction of treatment capability of display and output make it necessary to compress original HDR image before which are outputted in the conventional display and output device.So how to ensure that the best performance of HDR image reproduction is one of the key technologies of HDR image displays.This paper analyzes the mechanism of six high dynamic range image tone compression algorithms which are representative at present.The effect of the HDR image compression algorithms are analyzed and implemented.Then the 6 HDR image compression algorithms are compared by compression test through the subjective and objective evaluation methods.Research results show: compared to other algorithms,image color appearance model based on iCA M06 compression algorithm in HDR image tone compression and reproduce has obvious advantages.
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    Photochemical Synthesis of Inorganic Nanomaterials
    CAO Yitao, WU Lizhu, TONG Zhenhe(TUNG Chenho), ZHANG Tierui
    Imaging Science and Photochemistry    2017, 35 (5): 642-648.   DOI: 10.7517/j.issn.1674-0475.2017.04.024
    Abstract1839)      PDF (1712KB)(1298)       Save

    The synthesis of inorganic nanomaterials is one of the prerequisites and bases for the development of nanoscience. Different from the wet-chemical method at elevated temperature, the photochemical method reveals some unique characteristics in the synthesis of inorganic nanomaterials, and has attracted extensive attention in recent years. This paper reviews the applications of photochemical method in the synthesis of inorganic nanomaterials in recent years in three parts, including photochemical synthesis and loading of noble metal nanomaterials, photochemical synthesis of semiconductor nanomaterials, and plasmon-mediated photochemical synthesis of anisotropic metal nanocrystals. At last, on the basis of summarizing the advantages of photochemical method in the synthesis of inorganic nanomaterials and the shortcomings in the present studies, we prospect the possible direction of its development in the future.

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    Study on the Synthesis of N, Bi-codoped TiO 2 Nanoparticles and Their Visible Light Photocatalytic Performance
    LI Hai-yan, QIAN Jun-jie, LIU Jin-feng, LI Qiu-ye, ZHANG Min, YANG Jian-jun
    Imaging Science and Photochemistry    2013, 31 (6): 411-420.   DOI: 10.7517/j.issn.1674-0475.2013.06.411
    Abstract1837)      PDF (1167KB)(1559)       Save

    N, Bi-codoped TiO2 samples were prepared by hydrothermal method using nanotubube titanic acid as the precursor of Ti and Bi(NO3)3·5H2O as the bismuth and N source, respectively. The photodegradation of methyl orange (MO) was tested as a model pollutant to evaluate the photocatalytic activity of N, Bi-codoped TiO2 under visible light irradiation (λ≥420 nm). The photocatalysts were characterized by X-Ray diffraction (XRD), transmission electron microscope (TEM), diffused reflectance spectra (DRS), X-ray photoelectron spectroscopy (XPS). The results indicated that the main phase of the samples was anatase, and the average grain size was 20 nm. The doped-Bi existed in the form of Bi2O3 and BiONO3. As for the doped-N species, a part of N element existed in the form of NO3- of BiONO3, and another existed in the interstitial position of the TiO2 lattice to form the Ti-O-N bond in codoped samples. N, Bi-codoped TiO2 exhibited remarkable photocatalytic activity under visible light irradiation. The codoped-TiO2 prepared at 130 ℃(Bi/Ti=1%,molar ratio) showed the highest photocatalytic activity. The enhanced photocatalytic activity of N, Bi-codoped TiO2 was more likely ascribed to the fact that doped-N and Bi increased the utilization efficiency of visible light, and while decreased the recombination rates of photogenerated electrons and holes.

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    Photopolymerization of 4-Acryloylbenzophenone
    ZHANG Hai-qing, XIAO Pu, DAI Ming-zhi, HE Yong, NIE Jun
    Imaging Science and Photochemistry    2008, 26 (1): 32-38.   DOI: 10.7517/j.issn.1674-0475.2008.01.32
    Abstract1837)      PDF (1234KB)(3218)       Save
    The kinetics of photopolymerization of 4-acryloylbenzophenone (4-ABP) was studied by Real-time Infrared spectroscopy,which showed that 4-ABP was a very effective photoinitiator.When the photoinitiator and amine were used to initiate polymerization of acrylates,both rate of polymerization and final conversion increased and the induction period shortened with increase of amine concentration,4-ABP concentration and light intensity.For it is crosslinked in the cured film,the amount of extracted 4-ABP is much lower than that of BP.
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    Imaging Science and Photochemistry    1997, 15 (4): 357-362.   DOI: 10.7517/j.issn.1674-0475.1997.04.357
    Abstract1836)      PDF (261KB)(2937)       Save
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    A Fluorescent Sensor with a Large Stoke’s Shift
    XU Xiao-he, Phadungsak Phongphonkit, JI Hai-feng
    Imaging Science and Photochemistry    2011, 29 (5): 364-371.   DOI: 10.7517/j.issn.1674-0475.2011.05.364
    Abstract1807)      PDF (272KB)(1198)       Save
    Monitoring multiple physiological parameters by using the fluorescence method requires the loading of several distinct fluorescent probes which are excitable at the same fixed wavelength with well-separated emissions.Most current fluorescent probes only have small Stoke’s shift(50-90 nm),which limits their application in detecting multiple species simultaneously.In this work,we report a molecular probe based on a new design of receptor-Fluorophore-1-Spacer-Fluorophore-2(RFSF).The RFSF probe has a large Stoke’s shift,which is complementary to the traditional probes in detecting dual species.In this molecule,the fluorophore 1 is naphthalene and the fluorophore 2 is anthracene and the molecule can be used to detect proton.In the absence of proton,when the naphthalene is excited at 280 nm,a weak emission at 420 nm from anthracene due to energy transfer is observed.The Stoke’s shift was 140 nm,which was much greater than general fluorescent sensors with a single fluorophore,such as 60 nm for aminemethylnaphthalene.When exposed to protons,the fluorescence of anthracene at 420 nm increases.The results showed suggest that a new family of fluorescent RFSF sensors can be synthesized for biologically important chemicals,including metal ions,metabolites,proteins,and different biomarkers in the future.These valuable assay systems would benefit greatly from a wider choice of fluorescence probes with the same excitation wavelength.
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    Imaging Science and Photochemistry    1989, 7 (1): 24-29.   DOI: 10.7517/j.issn.1674-0475.1989.01.24
    Abstract1807)      PDF (2460KB)(1911)       Save
    According to Frack-Condon principle, the fluorescence and the difference between ground state and the first excited singlet state in bond order, dipole moment, total π electronic energy of benzene, naphthalene, anthracene, and their derivatives have been studied with PPP-SC(β, γ)-CI method on IBM-PC microcomputer. It is found that there are good correlated relationship between fluorescence maxima v F.L. and fluorescence emission energy △E F.L., fluorescence quantum yield φ, and total n electronic energy difference between ground state and the first excited singlet state: v F.L.= 9.5498△E F.L. + 22.5835(kcm -1) r = 0.9480 logφ= 0.3583(E g x - E e x)+ 1.5351 r = 0.9509
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    Construction of Nanostructured Silica Surfaces by Spray-Coating and Their Optical and Wetting Properties
    GAO Liang-juan, HE Pu, LI Xiao-yu, HE Jun-hui
    Imaging Science and Photochemistry    2012, 30 (4): 260-268.   DOI: 10.7517/j.issn.1674-0475.2012.04.260
    Abstract1800)      PDF (1512KB)(1838)       Save
    Silica nanoparticles with different sizes were fabricated via the Stöber method by adjusting the reaction temperature and the volumes of ethanol and water. Simple and convenient spraying-coating method was used to construct coatings on slide glasses with synthesized silica nanoparticles of 20 nm in size. Adhesion of silica nanoparticles to slide glasses was enhanced by calcination of the silica nanoparticle coatings at 550 ℃. After surface modification with 1H, 1H, 2H, 2H-perflurooctyltriethoxysilane, the wetting properties of these coatings changed from hydrophilicity to hydrophobicity. The silica nanoparticle coatings constructed by spray-coating are anti-reflective. When the mass percentage of silica nanoparticles was 0.48% and the number of spray-coating cycles was 3, the transmittance of coating reached as high as 95.5% in the visible range. It was found by scanning electron microscopy observations that the coatings obtained by spray-coating are uniform and controllable. The spray-coating approach to the construction of nanoparticle coatings are a simple and fast fabrication process, and is suitable for large area applications.
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    Synthesis and Photopolymerization Properties of Curable Benzophenone Derivative Photoinitiator
    ZHU Xiao-dan, LU Jian, HAN Yin-feng, WANG Ke-min
    Imaging Science and Photochemistry    2013, 31 (2): 140-149.   DOI: 10.7517/j.jssn.1674-0475.2013.02.007
    Abstract1800)      PDF (834KB)(2824)       Save
    The curable photoinitiator of 4-(acrylate-2-hydroxypropylate-3-oxy) benzophenone(AEBP) containing unsaturated double bond was synthesized by 4-(2,3-epoxypropoxy) benzophenone(EBP) and acrylic acid through ring-open reaction method. The chemical structure was characterized by FT-IR and 1HNMR. The UV absorption wavelength of AEBP was characterized by UV-Vis spectrum. The photopolymerization kinetics of AEBP were investigated by RT-IR, extraction method was applied to compare the migration of BP with AEBP after cured. The results showed that double bond conversion increased with the increase of AEBP concentration, when EDAB concentration was 1.2%, the final double bond conversion was the optimum, the initiating efficiency of AEBP with diacrylate monomer were better than that with triacrylate monomer. The rate of polymerization increased with light intensity. After cured with monomers, the migration of AEBP reduced greatly compared with that of traditional BP.
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    Research Progress of Photodynamic Antimicrobial Photosensitizers
    LEI Wan-hua, WANG Xue-song
    Imaging Science and Photochemistry    2013, 31 (5): 321-334.   DOI: 10.7517/j.issn.1674-0475.2013.05.321
    Abstract1765)      PDF (4226KB)(2796)       Save

    Photodynamic antimicrobial chemotherapy (PACT) is a new type of antimicrobial approach, using reactive oxygen species (ROS) generated by a photosensitizer and visible light to kill pathogenic microorganisms. ROS can react with most biological components of bacteria, making the acquired resistance to PACT unlikely. This is the main impetus for recent increasing attention on PACT. This review summarizes recent developments of new photosensitizers, including porphyrin derivatives, boron dipyrromethene compounds (BODIPY), conjugated polyelectrolytes and Ru(II) polypyridyl complexes, for PACT applications.

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    Research Progress of the Bottom Anti-reflective Coating for Photoresist
    WANG Kuan, LIU Jingcheng, LIU Ren, MU Qidao, ZHENG Xiangfei, JI Changwei, LIU Xiaoya
    Imaging Science and Photochemistry    2016, 34 (2): 123-135.   DOI: 10.7517/j.issn.1674-0475.2016.02.123
    Abstract1758)      PDF (3870KB)(5175)       Save

    With the rapid development of the micro-electronics industry, lithography technology has been moving forward to a higher resolution. Bottom anti-reflective coating has attracted great attention of researchers in terms of effectively eliminating the standing wave effect and the notching effect, improving the critical dimension uniformity and the patterning resolution. In this article, the photoresists and photolithography technique, and the classification, basic principle, etching process and development situation of the bottom anti-reflective coating are briefly reviewed. The latest research progress of the bottom anti-reflective coating is summarized in detail, especially the application of developable bottom anti-reflective coating in photoresist. Finally, the prospect and research directions of bottom anti-reflective coating in the future are also introduced.

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