Table of Content

15 March 2014, Volume 32 Issue 2

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2014, 32(2):  0-0. 

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Fluoride Chemosensors Based on Fluorescent Polymer via RAFT Polymerization

LIU Guofeng, NIU Haijun, ZHAO Ping

2014, 32(2):  133-140.  DOI: 10.7517/j.issn.1674-0475.2014.02.133

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Polymeric fluorescent chemosensor, poly(NIPAM_m-co-Nap_n) (abbreviation as PNap334), has been synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization. The copolymer consists of 1,8-naphthalimide as luminophore and benzamide as fluoride ions (F^-) selective detection unit. The F^-responsive properties of the resulted copolymer PNap334 were investigated in DCM/DMSO (9/1, V/V) solution and film, respectively. Based on an intermolecular proton transfer (IPT) and induced intramolecular charge transfer (ICT) mechanism, the polymeric chemosensor displays distinct selective detection of F^- both in solution and film. And the detection limit of F^- in solution is 1.05 μmol/L.

Synthesis of Bicarbazole-based Ambipolar Hosts and Application in Organic Light-emitting Devices

CUI Linsong, LIU Yuan, JIANG Zuoquan, LIAO Liangsheng

2014, 32(2):  141-149.  DOI: 10.7517/j.issn.1674-0475.2014.02.141

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Carbazole derivatives are usually used as hole transport and host materials because of their good hole transport ability and high triplet energy. In this paper, a novel bicarbazole derivative, named BCzDCN, was designed and synthesized by incorporating electron-withdrawing cyano group into bicarbazole at 3,6 position. Its thermal, photophysical and electrochemical properties were systematically investigated. The triplet energy of BCzDCN is higher than that of the most popular blue phosphorescent material iridium(Ⅲ) bis[(4,6-difluorophenyl)pyridinato-N,C²']picolinate (FIrpic). Therefore BCzDCN could be used as host material for blue phosphorescent organic light-emitting diodes (PHOLEDs) and further for white PHOLEDs. Blue and White PHOLEDs using BCzDCN as host exhibited excellent performance with maximum current efficiencies of 34.6 cd/A and 59.0 cd/A, respectively. Meanwhile, both the blue and white PHOLEDs exhibited extraordinary low efficiency roll-offs, their efficiencies roll-offs were merely 4.1% and 5.1% at the brightness of 1000 cd/m², respectively.

Hydrothermal Synthesis and Characterization of Ba₇F₁₂Cl₂：Eu²⁺ Used for X-ray Imaging Plate

LIANG Qinghua, SHI Yao, MA Wangjing, YANG Xinmin, LI Zhi

2014, 32(2):  150-156.  DOI: 10.7517/j.issn.1674-0475.2014.02.150

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The performance of X-ray imaging plate is highly related to the physicochemical properties of X-ray storage phosphors. Herein, Ba₇F₁₂Cl₂:Eu²⁺ phosphors were successfully synthesized by hydrothermal route by using BaCl₂, NaBF₄ and Ethylene diamine tetraacetic acid (EDTA) as reactants and additive agent, respectively. The phase structure, morphology and luminescence property of the as-prepared Ba₇F₁₂Cl₂:Eu²⁺ phosphors were characterized by X-ray diffraction (XRD), Field-emission scanning electron microscopy (FESEM), Energy dispersed spectrum (EDS), Raman spectrum and photoluminescence (PL) in detail. An assumptive formation process was proposed based on the investigation of influence of the reaction time, reaction temperature and the amount of EDTA on the products. The preliminary results demonstrated that the reaction temperature and the amount of EDTA played important roles on the phase and morphology of the product. The as-obtained Ba₇F₁₂Cl₂:Eu²⁺ phosphors exhibited intense emission under the excitation of UV light.

Synthesis of Triangular Gold Nanoplates Mediated by Tobacco Mosaic Virus

ZHANG Baihui, ZHOU Quan, BIAN Tong, YU Huijun, FAN Hua, NIU Zhongwei, WU Lizhu, TONG Zhenhe(TUNG Chen-ho), ZHANG Tierui

2014, 32(2):  157-162.  DOI: 10.7517/j.issn.1674-0475.2014.02.157

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Triangular gold nanoplates were successfully prepared through a room-temperature aquatic biosythetic route mediated by tobacco mosaic virus. The viruses treated with alkali were used as reducing agent and co-structure-directing agent. The structure and optical properties of gold nanoplates were characterized by high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED) and ultraviolet-visible spectroscope. The as-prepared triangular gold nanoplates are (111)-oriented single crystals. The edge length of the triangular gold nanoplates ranges from 40 to 120 nm and the thickness is about 15 nm. The gold nanoplates have two typical surface plasmonic resonance absorption peaks in the visible light region, which endows them with promising applications in the field of imaging, biosensing and catalysis.

Hydrothermal Synthesis and Application of the Fe₃O₄ Nanoparticles Modified with L-cysteine

LI Bo, HUANG Zhongbing, MENG Xianwei, TANG Fangqiong

2014, 32(2):  163-170.  DOI: 10.7517/j.issn.1674-0475.2014.02.163

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Good dispersion stability magnetic Fe₃O₄ nanoparticles with L-cysteine (L-Fe₃O₄ NPs) for surface modification and particle size regulator were prepared by hydrothermal method. The Fe₃O₄ NPs were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and vibrating sample magnetometer (VSM), respectively. The influence of L-cysteine on the morphology, particle diameter distribution, crystal structure and dispersion stability of Fe₃O₄ NPs was studied. The results showed that sedimentation height of Fe₃O₄ NPs which adjusted to pH 7.0 was about 6.5 times than L-Fe₃O₄ NPs which sedimentation time was 22 h. Furthermore, 4-nitrophenol catalyzed experiments were carried out for potential application in catalyzed field and we found that catalytic efficiency was increased significantly when Au absorbed by L-Fe₃O₄ NPs. Our results indicated that L-Fe₃O₄ NPs had excellent dispersion stability and had promising potential applications in waste water treatment field.

Synthesis, Structure and Spectral Properties of 2-(2’-Hydroxyphenyl)pyridothiazole

QIN Biao, CHEN Yong, LU Xiaojun, FU Wenfu

2014, 32(2):  171-180.  DOI: 10.7517/j.issn.1674-0475.2014.02.171

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3-aminopyridine-2(1H)-thione reacted repectively with Salicylaldehyde and 2-Hydroxy-1-naphthaldehyde to form two Schiff base ligands L1 and L2, following treated by triethylamine and boron trifluoride diethyl etherate to form a new 2-(2'-hydroxyphenyl)pyridothiazole (L3) and two BODIPY compounds B1 and B2. The structure of L3 and B1 have been determined by X-ray diffraction. 2-(2'-hydroxyphenyl)pyridothiazole compound(referred to HPT) exhibits excited-state proton transfer(ESIPT) effect, the effect of solvent polarity on ESIPT was investigated by UV-visible absorption and fluorescence spectra.

Fluorescence Quenching Effect of the Interactions between CdTe Quantum Dots and Proteins

JIAO Yong, LI Rongxia, AN Wenting, LI Shiqin, ZHAO Junhong

2014, 32(2):  181-190.  DOI: 10.7517/j.issn.1674-0475.2014.02.181

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On the basis of synthesizing of water-soluble CdTe and CdTe/CdS core-shell quantum dots (QDs) by hydrothermal methods, this work studied the quenching effects of cytochrome c (Cyt c) to the fluorescence of CdTe QDs and CdTe/CdS core-shell QDs,as well as CdTe QDs to the fluorescence of bovine serum albumin (BSA), respectively, and clarified the fluorescence quenching mechanisms. The results showed that the fluorescence quenching effects of Cyt c to CdTe QDs were dependent on the QDs size to a certain degree, and the smaller the sizes of CdTe QDs, the stronger the quenching effects. In addition, the quenching effects of Cyt c to CdTe/CdS core-shell QDs are stronger than that to CdTe QDs, indicating the surface transfer mechanism of excited electron. The fluorescence quenching effects of CdTe QDs to bovine serum albumin (BSA) were through the way of relaxing the helix structures of BSA.

Application of Wavelet De-noising Method in Concentration Measuring System Based on DOAS

MEI Weipeng, YU Miao, SHI Xiang, WANG Ying, FU Jie, ZHANG Yongcai

2014, 32(2):  191-199.  DOI: 10.7517/j.issn.1674-0475.2014.02.191

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The concentration measuring system based on DOAS is developed to watch the concentration of the sulfur dioxide in pollution gases. In order to decrease the influence of the system noise and the Mie Scattering,the wavelet de-noising method is used. By comparing 4 kinds of different wavelet function and improving traditional threshold value, the de-noising method based on rigisure threshold is found, and a new measurement is put forward to measure the effects of signal processing. This kind of technology is applied to processing the spectral signal accurately and reliably, and the error is controlled under 1.5%. Experimental research results and industry scene results show that the wavelet de-noising method can greatly improve the SNR of the system and minimize bad effects of noises.

B-spline Free-form Deformation Based 3-D Non-rigid Registration of Medical Images

FENG Zhaomei, DANG Jun, CUI Yaoyao, JIAO Yang

2014, 32(2):  200-208.  DOI: 10.7517/j.issn.1674-0475.2014.02.200

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Ultrasound imaging has been widely used because of its inherent advantages compared with others imaging modalities. It plays a positive role in clinical diagnosis, monitoring and surgery. Three-dimensional medical images could clearly show the size, shape of the lesion and provide relatively complete three-dimensional structure information of human tissue. In this paper, a non-rigid registration based on B-spline free form deformation for three-dimensional ultrasound (US) and Computed Tomography Compared (CT) was studied with thin-plate spline energy constraint solving image cross and overlap. In addition, we took relative overlap, mutual information and computation time as evaluation criteria to evaluate the performance of nonrigid registration algorithm for breast phantom images and clinical images. The demons method took an average of 1896 seconds, the improved algorithm took an average of 195 seconds, the efficiency increased by 8.7 times. The relative overlap was 89.58 percent of the original algorithm and the relative overlap was 91.35 percent of the improved algorithm, the accuracy was increased by 2.0 percent. The experiment results showed that the algorithm could achieve better registration results.

The Effect of Different Photosensitizers on the Photographic Performance of PTG Materials

LI Qiuyan, LI Jian, MA Wangjing, LI Jinpei

2014, 32(2):  209-215.  DOI: 10.7517/j.issn.1674-0475.2014.02.209

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The effect of different kinds of photosensitizers on the photographic performances of photothermographic materials based on silver benzotriazole was studied. It is found that both PTG materials with AgBrI and AgI as photosensitizers have a higher sensitivity than the PTG material with AgBr photosensitizer in the in-situ systems, the sensitivity is 16 times and 2.4 times as high as the control one. In the ex-situ PTG materials, the sensitivity of the PTG materials with AgBrI emulsion as photosensitizer is 3 times as high as the PTG materials with AgBr emulsion as photosensitizer. Besides, between of the in-situ PTG materials and ex-situ PTG materials with the same AgBr emulsion as photosensitizer, the latter has a higher sensitivity than the former. And the relevant factors were primarily investigated.