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影像科学与光化学
 
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Imaging Science and Photochemistry
 
2018 Vol.36 Issue.3
Published 2018-05-15

0
2018 Vol. 36 (3): 0-0 [Abstract] ( 16 ) [HTML 1KB] [ PDF 247KB] ( 41 )
211 Synthesis and Properties of a Novel Photosensitizer for Holographic Storage
WANG Zhen, ZHANG Diqin, ZHAO Yu, ZHANG Yunlong, ZHAO Yuxia
A new green-sensitive photosensitizer PRZA was prepared for widely used 532 nm semiconductor lasers. Using another two reported green-sensitive photosensitizers (BDEA and BTCP) as references, the effect of the molecular structures of three photosensitizers on their UV-Vis absorption spectra, their initiating polymerization efficiency in free radical polymerization system and their sensitivity and imaging performance in dual curing holographic recording materials were investigated. The results showed that the absorption spectrum of PRZA had an obvious red shift due to the substitution of benzene ring with thiophene ring compared with BDEA and BTCP, resulting in a significantly improved matching performance with 532 nm light source. The molar extinction coefficient of PRZA was as large as 6.35×104 L·mol-1·cm-1 at 532 nm. In a same prepolymer system, the three photosensitizers all showed the best initiating polymerization efficiency when their mass fractions were 0.01%. Among them, the polymerization rate and the double-bond conversion rate of prepolymers containing BTCP and PRZA were obviously better than the data of BDEA-containing one. The diffraction efficiency of samples using PRZA as photosensitizer was high as 85% with the highest sensitivity, up to 297×10-3 cm·mJ-1. Additionally, the sample exhibited good image storage and reproduction performance. The results proved that PRZA had a large potential in holographic storage.
2018 Vol. 36 (3): 211-218 [Abstract] ( 31 ) [HTML 1KB] [ PDF 4041KB] ( 74 )
219 A Test System for Airfield Lighting and Its Uncertainty Analysis
WU Hengyu, DUAN Haiyan, CHEN Xin, GUO Yan, WANG Yingwei
The spatial light intensity distribution and the total luminous flux of a LED airfield lighting lamp can be acquired by a Type-A goniophotometer. The uncertainty of measurement and the expanded uncertainty can be acquired through comparing the average light intensity of central beam and the true value. The average light intensity of central beam is acquired by moving the lamp along the horizontal direction and vertical direction, respectively. Results show that the expanded uncertainty of install location in the horizontal direction is less than that in the vertical direction. If the absolute value of relative error of average light intensity in central beam is asked to less than 2%, the expanded uncertainty in horizontal direction should be -0.3°~0.3°, and in vertical direction should be -0.4°~1°.
2018 Vol. 36 (3): 219-225 [Abstract] ( 23 ) [HTML 1KB] [ PDF 4375KB] ( 54 )
226 Synthesis and Photochemical Properties of One-component Visible-light Photoinitiator Based on Photodecarboxylation
DONG Xiaoqing, LI Zhiquan, LIU Ren, LIU Xiaoya
One-component visible-light photoinitiators receive more attention recently. A novel photoinitiator-tetraphenylphosphonium 2-(9-oxo-9H-thioxanthen-2-yl)acetate(TXP) was synthesized and contained thioxanthone as the chromophore, which generate radicals via photodecarboxylation reaction. The structure was characterized by 1HNMR, 13CNMR and HR-MS. The study on photolysis confirmed the photoinduced decarboxylation mechanism. The novel photoinitiator showed high activity in initiating thiol-ene click polymerization under visible-light LED sources, which makes the photoinitiator promising candidates for one-component visible-light photoinitiator.
2018 Vol. 36 (3): 226-235 [Abstract] ( 24 ) [HTML 1KB] [ PDF 3866KB] ( 58 )
236 Near-infrared Cyanine-based Fluorescent Probe for Cysteine with High Selectivity
MA Yaguang, ZHANG Yutao, MA Yiyu, GUO Zhiqian, ZHU Weihong
We developed a turn-on cyanine-based near-infrared (NIR) probe which can selectively detect cysteine. In this probe Cy-CF3, 4-(trifluoromethyl)thiophenol moiety is employed as both the recognition unit and fluorescence quenching group. With the titration of cysteine, a large blue shift (160 nm) is observed in the absorption spectra of Cy-CF3, accompanying with significant color changes. The probe Cy-CF3 shows obviously fluorescent enhancement at 780 nm in emission spectra. Over all, the probe Cy-CF3 exhibits high selectivity for cysteine over glutathione and other potential interferences. The reaction mechanism of Cy-CF3 with cysteine is verified by mass spectra, 1HNMR spectra and absorption spectra, indicating that 4-(trifluoromethyl)thiophenol in the probe Cy-CF3 could be replaced by cysteine, and then the PET process from 4-(trifluoromethyl)thiophenol to cyanine is blocked. The cell experiments also demonstrate that this probe could be successfully applied for the detection of cysteine in living cells.
2018 Vol. 36 (3): 236-244 [Abstract] ( 24 ) [HTML 1KB] [ PDF 3296KB] ( 49 )
245 Fabrication and Electrical Properties of Printed Carbon Nanotube Thin Film Transistors (TFTs) Based on Self-made Carbon Nanotubes
LIU Tingting, ZHU Tianxiang, SHAO Lin, ZHAO Xinluo, ZHAO Jianwen, CUI Zheng
In this work, we demonstrated that arc discharge carbon nanotubes produced by our lab could be acted as the channel materials after sorted by polymers. It was found that PFO-BT, PFⅡD, PCZ and PCZⅡD showed the ability to selectively separate sc-SWCNTs from pristine arc discharge carbon nanotubes produced by our lab. Among them, PCZ and PCZⅡD with the higher molecular weight and larger conjugated units showed higher efficiency to separate sc-SWCNTs. As-prepared sc-SWCNT inks could be used to directly construct thin film transistors by inkjet printer, and printed SWCNT TFTs showed good electrical properties with on/off ratio of 8×105 and effective mobility of 6.8 cm2·V-1·s-1.
2018 Vol. 36 (3): 245-253 [Abstract] ( 30 ) [HTML 1KB] [ PDF 3233KB] ( 69 )
254 Preparation and Application of Ionic Liquid-ureido Pyrimidone Mixed Low Shrinkage Monomer
LI Cong, ZHANG Rongjin, YUAN Yan, LIU Ren
Three UV-curing ureido pyrimidine (UPy-PEG) monomers with different molecular weight were prepared by addition reaction, and UV-curable imidazole ionic liquid (IMAA) was also synthesized. Three UV-curable ionic liquid-ureido pyrimidone (IMAA-UPy-PEG) monomers were prepared by mixing two kinds of monomers. The system had low volume shrinkage with IMAA-UPy-PEG added to the UV curable epoxy acrylic resin. The synthesis of IMAA and UPy-PEG were confirmed by 1HNMR spectroscopy. Homogeneous mixed monomers can be obtained by mixing UPy-PEG and IMAA and ultrasound in the ice bath. Real-time Fourier Transform Infrared (RT-FTIR) confirmed that the mixed monomers all had high photopolymerization rate. The maximum shrinkage of the formulations decreased from 5.33% to about 4.81% when the addition of the mixed monomer increasing from 10% to 30%. Compared with the commercial monomer HEMA, the formulations with mixed monomer all have lower volume shrinkage, with the shrinkage decreased to 2.6%. The test of the properties of UV-curable coatings showed that the hardness and gloss of the coating films decreased with the addition of the mixed monomer, but are within the scope of use.
2018 Vol. 36 (3): 254-266 [Abstract] ( 22 ) [HTML 1KB] [ PDF 2514KB] ( 43 )
267 Synthesis and Properties of a Sulfone Derivative as Bipolar Blue Phosphorescent Host Materials
WANG Yan, HOU Yan, ZHANG Qiang, WEI Huaixin, DAI Guoliang, ZHAO Xin
A novel bipolar blue phosphorescent host material, 2-(4H-phenoxazin-10-yl)-4H-thioxanthen-9H-10,10-dioxide (TXOPXZ), was designed and synthesized, and its structure was characterized by means of 1HNMR, 13CNMR and elemental analysis. The photophysical properties and energy-level structure of TXOPXZ were studied by ultraviolet-visble (UV-Vis), fluorescence, phosphorescent spectroscopies at 77 K, cyclic voltammetry (CV), thermogravimetric analysis(TGA), differential scanning calorimetry (DSC) and density functional theory(DFT). The results show that the maximum absorption wavelength is located at about 285 nm in dilute CH2Cl2 solution. The emission peak of TXOPXZ is located at 439 nm in dilute CH2Cl2 solution, and exhibits blue phosphorescent emission at 460 nm from the highest-energy vibronic subband at 77 K, from which its triplet state energy (ET) is estimated to be 2.70 eV. TXOPXZ can be used as host material for the blue emitter Firpic(2.62 eV) in PhOLED. Cyclic voltammetry measurement shows that HOMO energy level of TXOPXZ is located in -5.28 eV, which match with the energy levels of ITO(-4.5~-5.0 eV); LUMO energy level of TXOPXZ is located in -1.95 eV, which is close to the energy level of TAZ(-2.30 eV). The TGA data showed that the decomposition temperature was 329℃, indicating good thermal stability. DSC showed that the Tg was 191℃, indicating amorphous structure and good film forming property.
2018 Vol. 36 (3): 267-274 [Abstract] ( 18 ) [HTML 1KB] [ PDF 2259KB] ( 59 )
275 Facial Fabrication of CdS Nanoparticles Sensitized TiO2 Nanomesh with Enhanced Photocatalytic Activity
LI Yue, SONG Yuze, TAO Yanzhong, GAO Fengxian, TANG Ning
CdS nanoparticles coated on TiO2 mesh with high photocatalytic activity were successfully synthesized by a simple anodic oxidation method combined with continuous ion layer adsorption method. The CdS nanoparticles were evenly distributed on the top surface of the TiO2 nanotubes without clogging the tube entrances. Compared with the unmodified TiO2, the CdS/TiO2 composited catalyst possessed extended light absorption region and highest photocatalytic activities. After 120 min of irradiation, MB was degraded with the removal ratio of 71.3% on the bare TiO2 mesh, much lower than 98.3% on the CdS/TiO2 composited catalyst. Furthermore, the highest photocurrents were obtained on CdS/TiO2 composited catalyst when the depositing cycles of CdS reached to 15. The improved photodegradation efficiency on the composited catalyst mainly results from the enhanced visible-light absorption and lowest recombination rate of the electron-hole pairs due to the narrow-band-gap semiconductor of CdS.
2018 Vol. 36 (3): 275-282 [Abstract] ( 29 ) [HTML 1KB] [ PDF 3668KB] ( 47 )
283 Preparation and Spectral Characterization of a pH Ratiometric Fluorescence Probe
CUI Lixia, ZHANG Honghong, LI Miao, ZHANG Caihong, ZHANG Guomei, SHUANG Shaomin, DONG Chuan
Fluorescent probes (1 and 2) for pH based on semi-cyanine were synthesized from indole (benzo indole) derivatives and 4-hydroxybenzaldehyde using one-step condensation reaction. The probes have good water solubility and stable luminescence properties. They can be used to detect pH of acidic and alkaline solutions by the UV absorption spectra or ratiometric fluorescence spectra. The pKa data of probe 1 are 3.81 and 10.01, and the pKa data of probe 2 are 4.03 and 10.47. Both pH probes have some advantages, such as large Stokes shift, high sensitivity and good reversibility. Compared the two probes, probe 1 is more sensitive to the alkalinity, and probe 2 is more sensitive to the acidity.
2018 Vol. 36 (3): 283-290 [Abstract] ( 29 ) [HTML 1KB] [ PDF 4715KB] ( 58 )
291 The Effect of the Structures of Dicarboxylic Amino Acid-based Surfactants on the Surface and Wetting Properties and Aggregation Behavior
LU Xiang, HAO Chunling, JIANG Xiaoming
Three amino acid-based surfactants, C12GlyNa, C12MalNa2, C12GluNa2, were prepared and their structures were identified by 1HNMR. Their surface properties and aggregation behavior were studied. Compared to C12GlyNa, C12MalNa2 shows higher values of cmc, γcmc and lower values of Гmax and pC20. The surfactant, C12GluNa2, exhibits lower Гmax and higher Amin compared to C12MalNa2. The maximum contact angle of C12GluNa2 solution on the calcite surface is higher than that of C12MalNa2 solution. The methylene group between two carboxyl groups shows great influences on the surface properties and the aggregation behavior.
2018 Vol. 36 (3): 291-297 [Abstract] ( 24 ) [HTML 1KB] [ PDF 679KB] ( 51 )
影像科学与光化学
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