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Imaging Science and Photochemistry
2018 Vol.36 Issue.5
Published 2018-09-15

2018 Vol. 36 (5): 0-0 [Abstract] ( 15 ) [HTML 1KB] [ PDF 241KB] ( 42 )
381 Study on Sulfuration of ZIF-67 Thin Film for Counter Electrode of Squaraine-sensitized Solar Cell
XU Wenjiao, ZHANG Jingbo, SUN Yuxiu, DING Bin, LIN Yuan
Zeolitic-imidazole frameworks (ZIFs), as novel porous materials, have some special advantages such as large specific surface area, versatile porosity and well-connected networks. Here, we report porous composite materials of carbon and cobalt sulphide prepared by sulfuration of ZIF-67 thin film on the conducting glass. Then its catalytic performance was studied to replace platinum as the counter electrode for squaraine-sensitized solar cell. The structure and morphological characteristics of the sulfurating ZIF-67 porous thin films were obtained by X-ray diffraction, scanning electron microscope and isothermal adsorption measurements. The catalytic performance was evaluated by Tafel curve and electrochemical impedance spectrogram. It is concluded that the catalytic performance of sulfurating ZIF-67 for 60 min was compared with Pt, and the photoelectric conversion efficiency of the squaraine-sensitized solar cell was 4.03% and 4.10%, respectively.
2018 Vol. 36 (5): 381-388 [Abstract] ( 28 ) [HTML 1KB] [ PDF 1952KB] ( 65 )
389 Study on Fluorocarbon Chain Modified Acyl Phosphine Oxide as Long Wavelength Absorbing Photoinitiator
XIE Gang, YANG Jianwen, ZHONG Rong
2,4,6-Trimethylbenzoyl phosphonic acid perfluorooctyl ethyl ester (TPO-F), synthesized with ethyl 2,4,6-trimethylbenzoylphosphonate (TPO-L) and perfluorooctylethyl alcohol and oxalyl chloride.It was characterized by 1HNMR, 19FNMR and FT-IR. The UV absorption spectra of TPO-F were similar to those of TPO-L, the molar absorbance of maximum wavelength is slightly higher. It was confirmed that TPO-F could rapidly immigrate to formulation surface with the UV absorption depth-resolution following of TPO-F solution. The photopolymerization kinetics of acrylate monomer with TPO-L, TPO-F as photoinitiator was investigated by (Photo-DSC). TPO-F exhibits moderate photoinitiation efficiency approximating to TPO-L under nitrogen atmosphere, but improved photoinitiation efficiency for TPOL-F and its combination with TPO-L was resulted under air due to the surface self-concentration effect of TPO-F. Oxygen inhibition effect popularly existing in radical photopolymerization may thus be limited.
2018 Vol. 36 (5): 389-397 [Abstract] ( 23 ) [HTML 1KB] [ PDF 1726KB] ( 44 )
398 Electrochemical Selective Recognition of Tryptophan Enantiomers Based on Graphene/Chitosan Composite Films
ZHANG Jinping, FAN Jingbiao, HUANG Yan, MI Hongyu, GENG Jianxin
In this research, graphene/chitosan composite films were designed and used as electrode for electrochemical enantioselective recognition of tryptophan (Trp) enantiomers. The structure of the graphene/chitosan composite films were characterized using X-ray diffraction, FT-IR spectroscopy, Raman spectroscopy, XPS spectroscopy, transmission and scanning electron microscopy. Trp enantiomers were recognized using graphene/chitosan composite electrode by a differential pulse voltammetry. Experimental data indicated that L-Trp exhibited stronger electrochemical response than D-Trp, and that a linear relationship between the current density of the oxidative peak and the concentrations of L-/D-Trp was established in a concentration span ranging from 0.3×10-4 mol·L-1 to 1.5×10-4 mol·L-1. The composite electrode had a number of advantages including controllable thickness and area, good stability, and enhanced electrochemical signals. Therefore, the graphene/chitosan composite electrodes are expected to be used for enantioselective recognition in areas such as molecular drugs and clinical medicine.
2018 Vol. 36 (5): 398-407 [Abstract] ( 16 ) [HTML 1KB] [ PDF 3872KB] ( 54 )
408 Deep Photopolymerization Research of Highly Stable Thiol-ene System
CHEN Li, WU Qingyang, LIU Ren, LI Zhiquan
Traditional thiol-ene photopolymerization system suffers from poor stability, odor issue and limited curing depth. In this paper, a highly stable thiol-ene photopolymerization system with low odor was prepared via optimization of monomers. Polymerization depth of 9.6 cm with about 80% double bond conversion was successfully achieved employing the strategy based on near-infrared light (NIR) induces up-conversion nanoparticles (UCNPs) luminescence. The cured sample exhibited good homogeneity and thermal stability (~335℃), which shows potential in the applications of photocuring of dental restoration materials and thick composites.
2018 Vol. 36 (5): 408-416 [Abstract] ( 26 ) [HTML 1KB] [ PDF 4866KB] ( 46 )
417 Design of Distributed Aperture Semi-active Laser Detection System
CHEN Xin, LI Chongyang, XU Chunyun, FENG Yunpeng, CHENG Haobo
With the rapid development of electronics, information, materials, optics, and mechanical disciplines, non-imaging optics laser detection technology has received more and more attention in recent years. High accuracy and non-contact measurement characteristics make laser detection optical systems widely used in laser ranging, laser radar, and laser guidance. In this paper, a novel distributed aperture semi-active laser detection system is proposed to obtain the target angle information according to the principle of the four-quadrant detector and the characteristics of the image beam fiber. The system consists of four optical systems that meet the telecentric light path of the image square, a 4×1 beam fiber, and a detector. By setting up a system prototype, quantitatively measure the linear range of the semi-active laser detection system and the measurement error.The experimental results show that the system has a linear field of view of ±12°, and the measured value is close to the ideal curve of the linear region, which satisfies the design specifications of the optical system.
2018 Vol. 36 (5): 417-424 [Abstract] ( 9 ) [HTML 1KB] [ PDF 3532KB] ( 44 )
425 Synthesis and Properties of a pH Fluorescent Probe Based on PET Mechanism
CHANG Shunzhou, XIANG Kaiqiang, MING Wei, ZHANG Zhizhong, TIAN Baozhu, ZHANG Jinlong
A novel pH fluorescent probe (DCM-PA) was synthesized by employing dicyanomethylene-4H-pyran derivative as the fluorophore and piperazine as the response unit. The maximum absorption wavelength(λabs) and maximum emission wavelength(λem) were tested to be 421 nm and 590 nm, respectively. This means that the stokes shift is near to 170 nm. It was found that the fluorescence intensity gradually increased with the increase of pH value in the pH range of 2-12. The pKa of DCM-PA was determined to be 7.2. In the range of pH=6-9, there exists a good linear relationship between the fluorescence intensity and pH value. The response mechanism of the pH probe was revealed by the control experiment:Under acidic conditions, the electron donating ability of piperazine group will weaken after combining with proton, leading to the enhancement of the fluorescence intensity. Under alkaline conditions, the fluorescence will be quenched by the photoinduced electron transfer (PET) process. Moreover, it was found that DCM-PA exhibited a good anti-interference ability to different cations and anions.
2018 Vol. 36 (5): 425-433 [Abstract] ( 19 ) [HTML 1KB] [ PDF 3230KB] ( 38 )
434 Study on the Preparation and Properties of Thiol-ene Photosensitive Resins for DLP 3D Printing
WANG Chong, LIU Yulong, LIU Ren, LI Zhiquan
3D printing based on digital light processing (DLP) affords rapid fabrication speeds, high dimensional accuracy and enables fabrication of objects with complex geometries. Therefore, developing photosensitive resins suitable for DLP 3D printing has become essential. Compared to traditional chain growth photopolymerization based on acrylates, thiol-ene photopolymerization features rapid reaction rates, high conversions, more homogeneous networks and low volume shrinkage due to its unique step growth polymerization mechanism. In this paper, a series of thiol-ene photosensitive resin were prepared and successfully applied to DLP printing to fabricate 3D objects. We explored the influence of the content of thiol monomers on the polymerization kinetics, thermomechanical properties, tensile properties, volume shrinkage and printing accuracy. The results showed that the increased amount of thiol monomers led to significantly increased double bond conversion, improved homogeneity of polymerization network, increased elongation at break and reduced volume shrinkage after printing.
2018 Vol. 36 (5): 434-442 [Abstract] ( 25 ) [HTML 1KB] [ PDF 3667KB] ( 49 )
443 The Effect of Temperature on Imaging of Confocal Laser Scanning Microscope
WANG Juanjuan, WEI Xuehong
In order to explore the effect of temperature on imaging of confocal laser scanning microscope (CLSM), dynamic image acquisition experiments of Convallaria Maiglöckchen slice with heating and cooling condition are designed and conducted combined with the definite focus of Zeiss LSM880. The average bright field brightness and fluorescence intensity of image in heating and cooling process were also analyzed by Mean ROI, respectively. The results indicated that before and after use of Definite Focus, the heating and cooling of the live cell workstation all caused the focus-drift, which greatly affected bright field brightness and fluorescence intensity, and the quality of image was not improved. The temperature of live cell workstation continued changed after the temperature reached the set point. It would take about 20 min to stabilize. Once the temperature was stable, the focus-shift was weakened, and the influence of temperature on the brightness and fluorescence intensity of image decreased. Therefore, it is necessary to maintain the stability of the temperature of live cell workstation and the working condition of instrument, acquire the bright field of image in the process of confocal laser scanning microscope imaging, so as to eliminate the focus-drift and fluorescence intensity change caused by the temperature change and provide the accurate sample signals.
2018 Vol. 36 (5): 443-452 [Abstract] ( 25 ) [HTML 1KB] [ PDF 6507KB] ( 36 )
453 Preparation of TCMePyP and Research on the Killing Effect of Photodynamic Therapy on SH-SY5Y Neuroblastoma Cell
Carboxyl was connected to H2TPyP to modify and obtained the TCMePyP. UV-Vis absorption spectra and fluorescence spectra of TCMePyP were determined. The uptake of new porphyrin compounds in SH-SY5Y cells and the changes of intracellular ROS(reactive oxygen species) under radiation were observed. The inhibitory effect of new porphyrin compounds on neuroblastoma cell line SH-SY5Y was further investigated. The results showed that TCMePyP has the characteristics of effective photosensitizer:good lipid solubility and water solubility, strong absorption in visible light area. ROS increased with the radiation time under the photodynamic condition. It has inhibitory effect on the proliferation of SH-SY5Y tumor cells, and the killing effect is obvious. The emitted fluorescence can be located in SH-SY5Y tumor cells. In a word, TCMePyP has good prospects for medical applications.
2018 Vol. 36 (5): 453-463 [Abstract] ( 24 ) [HTML 1KB] [ PDF 5230KB] ( 43 )
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