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Table of Content

    15 January 2017, Volume 35 Issue 1
    2017, 35(1):  0-0. 
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    New Progress in Preparation of Multicolor Carbon Dots
    HOU Changshun, GE Jiechao
    2017, 35(1):  1-14.  DOI: 10.7517/j.issn.1674-0475.2017.01.001
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    Carbon dot (or carbon quantum dot), a novel carbon nanomaterial which has effective absorption, colorful fluorescence in the UV-Vis region, has great prospect to be applied in biomedicine, environment energy, and catalysis. However, in the past decade, no matter the top-down and bottom-up methods, most of C-dots emitted in blue-orange light. Recently, with the development of nanotechnology, various approaches have been exploited to prepare red-emissive or near-infrared emissive C-dots. In this paper, we briefly summarized the various preparation methods of carbon dots and mainly summarized the new progress in preparation of red or near-infrared emissive C-dots.

    Principle and Progress for the Surface Plasmon Resonance Sensor
    WU Shikang
    2017, 35(1):  15-25.  DOI: 10.7517/j.issn.1674-0475.2017.01.015
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    Surface plasmon resonance (SPR) is a high sensitivity detection technology that was rapidly developed in recent years. It is a label-free method with the capability of real-time to measure quantitatively the binding affinity between foreign species and some receptor components located on chips. It is also used as an important tool for detecting relatively small amounts of materials interested. Due to the capability to study the kinetics of chemical reactions, this method possesses important significance for the studying of interaction between drugs and its ligand molecule for new drug development. Under this reason, extensive attention for this method has been exhibited. In this paper, the formation of SPR phenomenon and its principle, mechanism for using as a sensitive sensor and its improvement have been briefly introduced and discussed.

    Research Perspectives on Efficient and Large-area OLED Lighting
    FAN Jian, FUNG Man-Keung, TANG Jianxin, LIAO Liangsheng
    2017, 35(1):  26-33.  DOI: 10.7517/j.issn.1674-0475.2017.01.026
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    Organic light-emitting diode (OLED) lighting is a new generation of healthy light source with its energy efficiency superior to compact fluorescent lamp (CFL). Since the invention of OLED by C. W. Tang in 1987, OLED technology for use as display and solid-state lighting has attracted extensive attention worldwide. Herein, the unique benefits of using OLED lighting are briefly introduced, and a review on research progress of OLED lighting is also provided. The problems and challenges to domestically make the OLED-lighting manufacturing equipment are discussed. Finally, the importance of developing efficient and large-area OLED lighting technologies and promoting the industrialization of OLED lighting has been emphasized.

    Research Progress of the Light-triggered Self-healing Polymers
    GAO Fei, CAO Jiancheng, LIU Jingcheng, LIU Ren, YUAN Yan, LI Zhiquan, LIU Xiaoya
    2017, 35(1):  34-45.  DOI: 10.7517/j.issn.1674-0475.2017.01.034
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    In recent years, light-triggered self-healing polymer has played an important role due to the controllable and fast ability to self-repair. It has three methods to achieve self-healing for light-triggered self-healing polymer:self-healing based on a photo-crosslinking reaction, self-healing based on a photo-triggered metathesis reaction and self-healing based on the photo-thermal effect. In this reiview, we highlight the recent progress made in light-controlled self-healing. We analyse the materials design, underlying mechanisms and chemistries involved in the different methods developed for this types of emerging photo-responsive materials. We also demonstrate the relationship and similarity between the three metheds. Possible future developments and perspectives of using light as a unique trigger for polymer self-healing is also discussed.

    Thiol-ene UV Curable Polyurethane Adhesive Based on Castor Oil
    WANG Qing, CHEN Guangxue, YU Mingguang, CHEN Qifeng, TAI Jinglei
    2017, 35(1):  46-52.  DOI: 10.7517/j.issn.1674-0475.2017.01.046
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    Urethane acrylates were prepared via melt polycondensation method and esterification method respectively, using isophorone diisocyanate (IPDI), castor oil (CO), hydroxypropyl acrylate (HPA) as main raw materials. CO-based thiol monomer was prepared via melt polycondensation method using castor oil (CO) and 3-mercapto propionic acid (3-MPA).Urethane acrylates and the thiol-compounds were blended with addition of photo-initiator in certain proportions, and then polyurethane curing film was formed through thiol-ene couple reaction between double bond and thiol under UV irradiation. The structure and properties of the urethane acrylate, thiol compound and the polyurethane curing film were characterized by NMR, FT-IR, Pohot-DSC and TG. The results indicated that the ethylene linkages of urethane acrylates and the thiol-compounds were successfully inserted in the polyurethane molecular chain. The UV-cured films showed good mechanical properties and thermal stability with curing time 60 s.

    Study on The Photochemical Properties of Photosensitive Polymer Films and The Induced Orientation of Liquid Crystal Molecules
    CAO Jin, WU Ti, ZHANG Weimin, WANG Zhanwen, ZHANG Xiaoliang, PU Jialing
    2017, 35(1):  53-60.  DOI: 10.7517/j.issn.1674-0475.2017.01.053
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    In this article, an ultraviolet spectrum method was used to measure the photoreaction property of polymer film containing coumarin photosensitive group. The photochemical reaction property of the film corresponding to the different exposure temperature and the different exposure energy were investigated. The orientation performance of liquid crystal induced by the film at different annealing conditions was also conducted. The results indicate that when the exposure temperature is 130℃, the value of anisotropy ΔA of the polymer film gets to the maximum and the corresponding exposure energy is the minimum. At the same time, the degree of photoreaction is about 45%. When the exposure energy achieve 320 mJ/cm2 and 384 mJ/cm2, and the annealing temperature is 160℃,the induced value of anisotropy ΔA and order parameter S is 0.22 and 0.048, respectively.

    Synthesis and Properties of a Novel Fe Doped Perovskite-type KMgF3 Photocatalyst
    NIE Kun, YANG Hanpei, SUN Huihua, CUI Suzhen, WU Junming
    2017, 35(1):  61-69.  DOI: 10.7517/j.issn.1674-0475.2017.01.061
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    The Fe doped perovskite-type Fe-KMgF3 photocatalysts were synthesized by a microemulsion preparation. The as-prepared catalysts were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), UV-Vis diffuse reflectance spectra (UV-Vis DRS), photoluminescence spectra(PL spectra) and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of the materials was performed by the degradation of aqueous Rhodanmine B and Methyl Orange. Results demonstrate that Mg2+ in KMgF3 may be substituted by a low amount of Fe3+ to form a homogenous solid solution while the perovskite-type structure of KMgF3 remains unchanged. The doping by Fe can suppress the growth and aggregation of KMgF3 crystallion, helps to improve the light response and inhibit the recombination of phtogenerated hole/electron pairs by forming the donor level of impurities and shallow traps in lattice matrix. The photocatalytic degradation rates of Rhodanmine B and Methyl Orange on doped catalyst under optimal content of Fe3+ (one quarter of Mg2+) reached 92% and 91% respectively in 30 min, and about 63% and 68% respectively of degradation rate enhancement which compared with non-doped KMgF3 was observed. After 5th photocatalytic experiment, the photocatalytic degradation rate of Rhodanmine B remains more than 90% of the fresh.

    Synthesis and Photochemical Properties of Photobase Generators Containing Thioxanthone
    SHEN Weizhen, LIU Xiaoya, LIU Ren, LI Zhiquan
    2017, 35(1):  70-79.  DOI: 10.7517/j.issn.1674-0475.2017.01.070
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    A novel photobase generator (PBG) was synthesized in two steps using thiosalicylic acid and (phenylthio)acetic acid as starting materials. The structure of the PBG was characterized by 1HNMR, 13CNMR and high-resolution mass spectrometer. The photolysis mechanism was systematically studied via steady photolysis and electron spin resonance tests. The PBG showed a strong absorption at around 400 nm. Under the 365~500 nm irradiation, the PBG could efficiently induce thiol-epoxy photopolymerization. The initiation efficiency of the PBG was higher than that of the reported efficient PBG initiation system in the literature.

    Study on Nano Metal Oxide Thermal Insulation Film and Properties
    QIN Changxi, NIU Juanni, GAO Chao
    2017, 35(1):  80-87.  DOI: 10.7517/j.issn.1674-0475.2017.01.080
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    This article studies the relationship between particle size and coating thickness of UV cured nano metal oxides(ATO), as well as the insulation properties of the film, the performance and characteristics of nano coating thermal insulation film and magnetron sputtering. Results show that, functional degree of the light cured resin monomer and other components, the amount of nano metal oxides and the size of the nano materials have a close relationship. With a reasonable material combination of the insulation film, insulation rate can reach more than 50%. Compared to the magnetron sputtering films, nano coating insulation film shows highly pervious to light and improved thermal insulation and good thermal insulation performance. Even after damp heat aging, the infrared transmittance change of nano thermal insulation film is only about 5%.

    Study on Spectral Reconstruction Method Based on Optimized Selected Samples
    LONG Yanqun, WANG Huiqin, WANG Ke, WANG Zhan, ZHAO Suwen
    2017, 35(1):  88-96.  DOI: 10.7517/j.issn.1674-0475.2017.01.088
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    Aiming at the defect of existing sample selection methods for spectral reflectance reconstruction, a new method based on the kernel fuzzy C-means clustering optimization sample selection is presented.This method considers the extensiveness of spectral reflectance space and the similarity of chroma space, meeting the accuracy of spectral reconstruction. Firstly, C samples are selected as the initial clustered core in the spectral reflectance space. And the original spectrais turned into(a*,b*) color space. At the same time, 2D chrominance space is mapped to the 3D feature space with kernel function, making characteristics linearly separable,to achieve a better result.The experiments show that this method selects training samples for spectral reflectance reconstruction can further improve the accuracy of spectral reconstruction, and it is better than the existing methods in the chroma and accuracy assessment effects.