Table of Content

16 July 2015, Volume 33 Issue 4

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2015, 33(4):  0-0. 

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Synthesis of 1,2,4-Triarylbutane-1,4-Diones Using UV Light Mediated

HUANG Hongli, GAO Guolin, YANG Chao, XIA Wujiong, CHEN Xiaoming

2015, 33(4):  265-274.  DOI: 10.7517/j.issn.1674-0475.2015.04.265

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Benzoyl radical could be generated from photochemical cleavage reaction of benzoin, which then might add to C=C double bond of α,α-diaryl allylic alcohols followed by 1,2-aryl migration to realize the difunctionalization of alkenes. The reaction provided an efficient approach to synthesize 1,2,4-triarylbutane-1,4-diones. The procedure is highlighted by its operational simplicity and mild reaction conditions.

Rapid Visual Immunoassay of Multi-biomarker for Heart Failure Based on Magnetic Particles Images

HUO Weisong, ZHANG Lei, GAO Yuzhe, MENG Fanda, GAO Yunhua

2015, 33(4):  275-284.  DOI: 10.7517/j.issn.1674-0475.2015.04.275

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Based on sandwich immunoassay, immuno-adsorption model and quantitative analysis of magnetic particles image on the surface of silicon chip, rapid immunoassay of multi-biomarkers for heart failure had been established.This method is simple and rapid compared to traditional ELISA.The assay time does not exceed 1 hour from antibody immobilization to final results obtained. In addition, it was easy to realize a joint measurement for NT-proBNP and cTnI on single silicon biochip.The limits of detection for NT-proBNP and cTnI were 21.8 pg/mL and 0.034 ng/mL, and the detection ranges were 21.840000 pg/mL and 0.03450 ng/mL, respectively.The assay results for NT-proBNP and cTnIwere compared using 83 serum samples from patients with different cardiovascular diseases with those on commercial analyzers and obtained a very good correlation (r>0.98). In conclusion, this rapid visual immunoassay is well suitable for the clinical detection of heart failure biomarkers.

Preparation of Novel Anatase TiO₂ Nanotube with High-concentration-intrinsic Defects

ZHANG Jiwei, JIN Zhensheng, ZHANG Jingwei, LI Qiuye, ZHANG Zhijun

2015, 33(4):  285-291.  DOI: 10.7517/j.issn.1674-0475.2015.04.285

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In this paper, chemical substances were chemically adsorbed on the inner and outer surface of nanotube titanium acid (NTA) to prevent the collapse of the nanotubular structure in the process of the transformation of the orthorhombic NTA to anatase TiO₂. The pure novel anatase TiO₂ nanotubes can be obtained by removal of the surface chemical substances. And these novel TiO₂ nanotubes are hopefully used in the field of hydrogen production from visible light overall water splitting, drug delivery and nano-reactor.

High Efficiency Thermally Activated Delayed Fluorescence Devices Based on Solution-processed

XIE Lisha, WANG Hui, MENG Lingqiang, CHEN Biqiang, WANG Ying

2015, 33(4):  292-299.  DOI: 10.7517/j.issn.1674-0475.2015.04.292

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Solution processed thermally activated delayed fluorescence (TADF) light-emitting diodes have been fabricated with a yellow TADF material TXO-TPA as the guest and TCTA as the host, by combining the spin-coating method and vaccum deposition method in the device fabrication process. With the purpose of investigating the effect of electron-transporting material on device performance, we selected electron-transporting material from TmPyPB, TPBI,BCP and Alq₃. By optimizing the device structure, high efficiency yellow TADF OLEDs by using TPBI as the electron-transporting material have been achieved. The excellent performance of TPBI can be attributed to its suitable HOMO/LUMO energy level, a high electron mobility and triplet energy level which favors electron transporting and triplet exciton blocking.The device using TPBI as an electron transporting material exhibited excellent performance with low drive voltage of 3.6 V, maximum current efficiency of 16.2 cd/A, EQE of 5.97%.

Synthesis and Electro-optical Properties of a Novel Nonlinear Optical Chromophore Containing 4, 4-dihexyl-4H-cyclopenta [2,1-b:3,4-b'] dithiophene as π Bridge

YANG Dan, XU Huajun, CONG Shengyu, BO Shuhui, QIU Ling, ZHEN Zhen, LIU Xinhou

2015, 33(4):  300-306.  DOI: 10.7517/j.issn.1674-0475.2015.04.300

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A novel second-order nonlinear optical chromophores containing 4, 4-dihexyl-4H-cyclopenta[2,1-b:3,4-b']dithiophene (CPDT) as π-electron bridges was prepared, and its chemical and physical properties were systematically evaluated. UV-Vis spectra, thermal stability and density functional thoery (DFT) calculations revealed that CPDT as π-spacer can dramatically enhance intramolecular charge transfer (ICT) properties and narrow the energy gaps. And due to the hindrance of dihexyl, the chromophore showed weak dipole-dipole aggregation. As expected, the poled polymer film which was prepared by doping chromophore A into amorphous polycarbonate(APC) with 20%(mass fraction) doping density, exhibited 85 pm/V in electro-optical (EO) coefficient test.

Fabrication and Photocatalytic Study of Flexible Silicon Nanowires Array

ZHANG Bingchang, WANG Hui, LI Fan, ZHANG Xiaohong

2015, 33(4):  307-314.  DOI: 10.7517/j.issn.1674-0475.2015.04.307

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Silicon nanowires array is an important material for utilizing solar energy to solve energetic and environmental problems. However, there are few methods in fabricating flexible silicon nanowires array, which could be used in flexible electronics and biocompatibility devices. In this work, flexible silicon nanowires arrays with different polymer thickness are successfully fabricated through chemical vapor deposition and polymer-assistant transfer method. The influence of polymer thickness on the photocatalytic activity of flexible silicon nanowires array is also studied. The result reveals that the photocatalytic activity of flexible silicon nanowires array would increase as the thickness of polymer decreases. Thus, flexible silicon nanowires array with polymer thickness as low as 5 μm fabricated in this work is potential as the photoelectrode in highly effective flexible solar cells and water-splitting photoelectrochemical system. And the result also provides foundation for designing flexible nanowires array with high solar energy transferring capability.

Two-photon-inducedFluorescence of 2,5-Bis(4-dimethylaminostyryl)pyrazine

HAO Yongchao, CHEN Yi

2015, 33(4):  315-320.  DOI: 10.7517/j.issn.1674-0475.2015.04.315

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2,5-Bis(4-dimethylaminostyryl)pyrazinewith D-π-A-π-D symmetric structure is prepared and its two-photon-induced fluorescence is investigated using femto-second laser pulses. Strong two-photon induced fluorescence is detected in DMSO solution, and the largest two-photon absorption cross-section (σ =212 GM)is obtained at 820 nm.The quadratic dependence of the fluorescence on the excitation laser intensity confirms the two-photon process.

Spectral Study on the Photoreduction of Horseradish Peroxidase under Macromolecular Crowding Conditions

CAO Hongyu, WANG Zhen, TANG Qian, ZHENG Xuefang

2015, 33(4):  321-329.  DOI: 10.7517/j.issn.1674-0475.2015.04.321

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The ferric Horseradish Peroxidase(HRP) can be photoreduced to ferrous state by photoexcitation in dilute solution. However, these researches neglected the high crowding conditions in cell environment. We applied UV-Vis absorption, synchronous fluorescence and CD spectra to study the photoreduction process of HRP and its dependence on the external environment under macromolecular crowding conditions. The UV-Vis absorption spectrum data showed that the degree of HRP photoreduction was higher in Dextran70 solution when 403 nm monochromatic light, but HRP was not photoreduced in Ficoll70 solution. The photoreduction process of HRP was facilitated in Dextran70 or Ficoll70 solution when 280 nm monochromatic light. In addition, the photoreduction extent was much larger in Ficoll70 solution than that in Dextran70. The optimum temperatures of photoreduction process were 4 ℃ and 24 ℃ in the presence of Dextran70 and Ficoll70, respectively. The optimum concentration of Dextran70 for the photoreduction was 100 g/L and photoreduction extent showed an increase with the rise of Ficoll70 concentration. The CD spectra results illustrated that the secondary structure of protein remained the same after irradiation under macromolecular crowding solutions.

Research on a Real-time High Dynamic Range Image Synthesis Algorithm for Parallel Computing Environment

WANG Xuan, CHEN Xin, LIU Wei

2015, 33(4):  330-335.  DOI: 10.7517/j.issn.1674-0475.2015.04.330

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High dynamic range image (HDRI) synthesis is of high algorithm complexity, which makes it almost impossible to implement in real-time processing situation. To deal with this drawback, we proposed a real-time HDRI synthesis algorithm that is applicable to hardware which can deal with parallel computing. This method first derives detector illumination response function, and then accomplishes the recovery of illuminances on scenes of multi-exposure images and real-time integration of pixels through digital signal processing on FPGA. Simulation results indicate the correctness and efficiency of this algorithm, which also can meet the design requirements in real-time processing.

Controllable Synthesis of Highly Active BiVO₄ by Urea Co-precipitation and the Mechanism for Enhanced Photocatalytic Performance

ZHANG Jinqiu, ZHANG Yan, ZHU Yukun, PENG Yanhua, ZHOU Xiaochen, YU Jianqiang

2015, 33(4):  336-344.  DOI: 10.7517/j.issn.1674-0475.2015.04.336

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Monoclinic Scheelite BiVO₄ photocatalysts with high crystallinity were synthesized by a homogeneous precipitation method under the assistance of heat, ultrasonic and hydrothermal treatments. The crystal structure, morphology and photophysical property were characterized by XRD, SEM, and DRS techniques, respectively. It demonstrated that BiVO₄ with a high crystallinity can be synthesized by three different processes. However, a great difference can be observed on the micrographic morphology. The photocatalytic performance of these catalysts were evaluated by the decolorization of red dye FN-3G in aqueous solution under visible-light irradiation (λ> 420 nm). All the three samples showed high activity for the dye decomposition. The improved photocatalytic activities of the samples synthesized by the assistance of ultrasonic and hydrothermal treatment are mainly ascribed to the high crystallinity and large surface area. The improvement in the crystallinity can reduce the probability of electron-hole recombination, so as to enhance the photo-to-current conversion efficiency, while the increases in the surface area mainly improve the adsorption capacity of dye molecules.