IMAGING SCIENCE AND PHOTOCHEMISTRY

Photochemical Reaction of(Benzene) Manganese(Ⅰ) Tricarbonyl Complex

ZHOU Li, WU Li-zhu, ZHANG Li-ping, TONG Zhen-he(TUNG Chen-ho)

2006, 24(6): 401-403. DOI: 10.7517/j.issn.1674-0475.2006.06.401

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Irradiation of (benzene)manganese(Ⅰ)tricarbonyl complex results in benzene formation with yield of 90% and quantum yield of 0.5,respectively.

Resolution of Cubane-like Photodimer of Carboxylic 2-Naphthoate by L-(-)-α-Phenyl Ethylamine

LEI Lei, WU Li-zhu, TONG Zhen-he(TUNG Chen-ho), ZHANG Li-ping

2006, 24(6): 404-407. DOI: 10.7517/j.issn.1674-0475.2006.06.404

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The racemic photodimer of carboxylic 2-naphthoate was successfully resolved by using L(-)-α -methylbenzylamine as chiral derivative agentia (CDA).The circular dichroism spectra of the resolved racemic mixture were obtained.

Sensitization of Cubo-Octahedral Silver Bromide Emulsion Doped with Formate

MA Wang-jing, XIA Pei-jie

2006, 24(6): 408-414. DOI: 10.7517/j.issn.1674-0475.2006.06.408

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By use of the double-jet apparatus controlled by a microcomputer, cubo-octahedral AgBr grain emulsions in which formate ions were doped at subsurface of AgBr microcrystals, were prepared. By calculation, the ratio of facet (100) to facet (111) of this kind of grains is about 2:3. The sensitometric results from these emulsions show that the sensitivities (S_d) of formate-doped emulsions, relative to those (S₀) of the corresponding undoped ones as the controlled, regardless of whether it is primitive, or sensitized chemically and spectrally, were remarkably increased without a significant increase in fog density. (S_d/S_o≈2).

Analysis of Laser Assisted Chemical Etching Properties of YBCO Film by Infrared Real Time Monitoring

LIU Juan-xiu, YANG Kai, BU Shi-rong, ZHANG Tian-liang, NING Jun-song, LUO Zheng-xiang

2006, 24(6): 415-420. DOI: 10.7517/j.issn.1674-0475.2006.06.415

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An infrared real time monitoring system was designed to obtain thermal images of H₃PO₄ layer profile during laser assisted chemical etching of high temperature superconducting film (YBa₂Cu₃O_7-δ film). The temperature distribution and heat diffuse of solution were studied, as well as the relation between infrared monitoring data and YBa₂Cu₃O_7-δ laser assisted chemical etching characteristics was analyzed. The major experimental conclusions include: The temperature distribution and heat diffuse of solution can be truly reflected by infrared thermal image, which is valuable for the analysis of thermal circumstance of laser assisted etching; the created heat diffuse height on YBa₂Cu₃O_7-δ film surface and corresponding infrared grey-scale can be achieved at any time to analyze the differences between etching starting duration and etching degree of any small regions on YBa₂Cu₃O_7-δ film surface, which provides a new method for the real time monitoring of laser assisted etching properties of YBa₂Cu₃O_7-δ and other materials.

Fabrication and Characteristics of Ag-PVA and Ag-PVA/TiO₂ Ultrathin Composite Films

WANG Xiao-jun, LIU Shu-xia, HE Jun-hui

2006, 24(6): 421-427. DOI: 10.7517/j.issn.1674-0475.2006.06.421

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Ag nanoparticle-PVA composite systems were prepared by three methods. In the heating-induced reduction, Ag nanoparticles formed had a diameter of 15 nm, and showed a broad surface plasmon resonance absorption band at λ_max 420 nm. In the ambient reduction by NaBH₄, the surface plasmon resonance absorption of Ag nanoparticles blue-shifted to 409 nm, and became narrower. The average diameter of Ag nanoparticles produced was 8.7 nm. When the reduction process was carried out at low temperature (0 ℃), the absorption of Ag nanoparticles further blue-shifted to 397 nm, and 3.5 nm Ag nanoparticles were obtained. Smooth, transparent and uniform thin films were fabricated by spin-coating the Ag nanoparticle-PVA composite systems on substrates. This approach is suited for preparation of uniform multilayer films of varied thicknesses and spectroscopic properties. When Ag-PVA composite system and Ti(O_nBu)₄ ethanolic solution were alternatively spin-coated on substrate, Ag-PVA/TiO₂ composite films were obtained. UV-Visible spectra showed a regular film growth and enhancement of film absorption with increasing the number of Ag-PVA layers. In contrast, no significant effect of TiO₂ layers was observed on the absorption spectrum of film. Such organic/inorganic nanostructured multilayer films may be promising in optical, electronic, and catalytic applications.

XPS Study of the Surface of UV Cured Acrylates

LUO Yan, WANG De-hai, CAI Yan-qing

2006, 24(6): 428-435. DOI: 10.7517/j.issn.1674-0475.2006.06.428

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The epoxy acrylate resins were UV cured under different atmospheres (air and N₂) and characterized with X-ray photoelectron spectroscopy at two different take-off angles, namely 60° and 90°. The results obtained indicate that different curing environments result in the change of surface energy of the films. Compared with the film cured in the air, the binding energies of C1s and O1s on the surface of the film cured in N₂ move to lower ones. The content of C—C/C—H is higher than that cured in the air, whereas the contents of CO and C—O are lower in both cases. As for the film cured in the air, the content of the single-bond oxygen with high binding energy is higher than that cured in N₂. Both the binding energy of C1s and O1s and the atomic contents are different between the surface and substrate interface of the films. For example, the binding energy of C1s on the surface and glass interface of the film cured in N₂ are 286.62 eV and 287.48 eV, respectively. Besides, the atomic concentration in the films presents gradient distribution from the most external surface toward the bulk. The contents of CO and C—O increase from surface to bulk, and the content of C—C/C—H decreases from surface to bulk, which is caused by the migration of the compositions during the curing process.

Studies of Synthesis of Triazine Derivatives and Their Properties as Photoacid Generators

WANG Jian, WANG Wen-guang, ZHANG Wei-min, PU Jia-ling

2006, 24(6): 436-443. DOI: 10.7517/j.issn.1674-0475.2006.06.436

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A series of triazine derivatives (1a—1e) were synthesized in moderate yields as photoacid generators. All novel compounds synthesized were characterized with ¹H NMR and MS, and these data were found in good agreement with expected structures. Quantum yields of decomposition and acid formation of compound 1e in acetonitrile in different concentrations were measured when exposed at 405 and 365 nm. It was found that Quantum yields are strongly dependent on the wavelengths of light, rather than on their concentrations in acetonitrile. Decomposition and acid formation in acetonitrile of PAG 1e are more efficient at 405 nm than at 365 nm.

Decolorization of Methyl Orange Induced by Photolysis of Diiron-Substituted Silicotungstate

Lu Xiao-meng, LIN Jia-min, XIE Ji-min

2006, 24(6): 444-449. DOI: 10.7517/j.issn.1674-0475.2006.06.444

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Tetrabutylammonium salt of SiW₁₀Fe₂(Fe₂POM) was synthesized and methyl orange (MO) was taken as photodecolorization test compound. Rate of photodecolorization was probed over original concentration of MO, dose of catalyst, diversity of pH. Isopropyl alcohol was taken as ·OH scavenger and mechanism of MO photodecolorization under Fe₂POM-H₂O₂ system was studied. The results indicated that high photodecolorization efficiency was achieved at wide pH range. The photodecolorization of MO at the concentration ranged at 40-160 mg/L was in accordance with apparent first order reaction and the photodecolorization rate decreased with increase of the initial MO concentration. The activity of photodecolorization is in the turn of Fe₂POM-H₂O₂Fe₂POM>blank experiment.

Synthesis of the Photoacid Generator——Triphenylsulfonium Tosylate

LI Ping, LI Ping, LIU Jian-guo

2006, 24(6): 450-453. DOI: 10.7517/j.issn.1674-0475.2006.06.450

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The triphenylsulfonium bromide was synthesized from the original reactant biphenyl sulfoxide with the improvement of the solvent medium. The reaction time was greatly shortened and its yield was boosted. Then the photoacid generator(PAG) triphenylsulfonium tosylate was synthesized by silver salt replacement. Its FT-IR and ¹H NMR spectra were tested.

Preparation and Characterization of AgI Nanoclusters with PAMAM Dendrimers as Template

FAN Xin-hua, YAO Wei-shang, LI Guo-ping, LUO Yun-jun

2006, 24(6): 454-461. DOI: 10.7517/j.issn.1674-0475.2006.06.454

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AgI nanoclusters were successfully prepared by using PAMAM dendrimers as templates in water system. In the prepared process, the size and size distribution of prepared AgI nanoclusters depend on the the terminated groups of PAMAM dendrimers, reaction time, the molar ratio of silver ions to PAMAM dendrimers. The gained AgI/PAMAM dendrimer nanocomposites were characterized by UV-Vis spectrophotometer,fluorescence spectrophotometer,TEM. The size of prepared AgI nanoclusters depend on the the terminated groups of G4.5-COOCH₃ PAMAM dendrimers were smaller than G5.0-NH₂ PAMAM dendrimers in the same conditions. This was result of the inner-template of G4.5-COOCH₃ PAMAM dendrimers. The results show that the stability of AgI/PAMAM dendrimer nanocomposites was better and could preserve more than two months in the room temperature when G4.5 concentration is 1×10^-6 mol/L,the ratio of Ag⁺ to G4.5 dendrimer is 20.

Controllable Preparation and Characterization of Novel Fluorescence Nanomaterials and Nanoaxnposites

FENG Hua-jun, TANG Fang-qiong

2006, 24(6): 462-462. DOI: 10.7517/j.issn.1674-0475.2006.06.462

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Investigation on the Controllable Preparation of Uniform and Monodisperse Titania and Its Composite Colloid Particles

WANG Peng, TANG Fang-qiong

2006, 24(6): 463-463. DOI: 10.7517/j.issn.1674-0475.2006.06.463

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