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排序方式: 共有94条查询结果,搜索用时 15 毫秒
1.
A novel elastic polymer containing 4,4′-bipyridinium salts with tetrakis[3,5-bis(trifluoromethyl)phenyl]borate as part of the main chain was synthesized. The cast film showed persistent and reversible colour changes due to photoinduced electron transfer upon excitation of an ion-pair charge-transfer band (ex >365 nm) in vacuo. The lifetime of the coloured state markedly depended on temperature. The optically written data were stored without decay below 0°C and were erased thermally at elevated temperatures. The colour changes were reversibly repeatable for many times. 相似文献
2.
M. V. Klein Ran Liu D. Salamon S. L. Cooper W. C. Lee D. M. Ginsberg S. -W. Cheong 《Journal of Superconductivity》1994,7(2):429-433
Optical absorption at the insulating gap in the parent phase of cuprate superconductors shows a broad exciton-like peak near 1.7 eV, followed by a gradual decrease in absorption persisting 1 eV above the gap. By using ultraviolet laser lines to excite Raman spectra, we have found a Raman peak 0.2 eV below the first absorption peak in insulating cuprates. The Raman peak is much narrower than the absorption peak and hasA
2g
symmetry. We assign it to an exciton consisting of a hole transition from Cu
to a linear combination of Cud
xy
and nearest neighbor Op
orbitals. We have also studied the resonance Raman profile for two-magnon Raman scattering in the same samples. We find a sharp resonance feature at about 2.7 eV, and little Raman intensity for photon energies at the 1.7 eV absorption peak. The state created at the peak must therefore be an inappropriate intermediate state for the double spin-flip Raman process. 相似文献
3.
Kai-Bin Jiang Wei-Qiang Huang Tian-Tian Song Pei-Xuan Wu Wen-Fei Wang Qing-Song Chen Ming-Sheng Wang Guo-Cong Guo 《Advanced functional materials》2023,33(43):2304351
Construction of heterojunctions to photocatalysts is one of the most promising approaches to improve charge separation efficiency; however, the established constructing processes usually require high-temperature conditions and/or the adding of highly concentrated or expensive exotic species, and the improvement of effective contact and charge exchange between heterojunction components remains a problem. This work proposes an unprecedented “photobreeding” method and realizes the direct growth of Zn nanowires and Mott–Schottky heterojunctions from ZnS or viologen-coated ZnS microspheres through a photochemical reaction at room temperature without external species, while demonstrating the hypothesis proposed 140 years ago on the formation of Zn in the photochromic process of ZnS. After photobreeding of the heterojunctions, the hydrogen production efficiency of the photocatalysts increases by 2 orders of magnitude. This inexpensive, facile and efficient synthetic method will find applications in H2 production, organic synthesis, CO2 reduction, nitrogen fixation, and so on. 相似文献
4.
Tarasankar Pal 《Materials and Manufacturing Processes》2006,21(3):315-317
Cetylpyridinium chloride (CPC)-stabilized gold organosol in toluene has been prepared by using a two-phase (water-toluene) extraction of AuCl4- followed by its reduction with sodium borohydride in the presence of the surfactant, CPC. The surfactant-stabilized gold nanoparticles were exploited to examine their optical properties when exposed to various solvent systems by measuring the changes in the localized surface plasmon resonance (LSPR) spectrum. 相似文献
5.
(DMA)3PMo12O40/聚乙烯醇复合薄膜的制备与性能 总被引:1,自引:0,他引:1
以有机-无机电荷转移杂化分子(DMA)3PMo12O40与聚乙烯醇(PVA)掺杂得到(DMA)3PMo12O40/PVA复合材料薄膜;对复合膜的结构、热性能、光色性和电化学性能进行了研究。该复合材料经紫外光照射后,吸光强度增加,价层吸收带(IVCT)展宽,表明具有良好的光色性:(DMA)3PMo12O40/PVA薄膜修饰电极的电化学行为显示该材料对KIO3有明显的催化作用。 相似文献
6.
T. Koltai M. Macaud A. Milenkovic E. Schultz M. Lemaire M. Vrinat 《Catalysis Letters》2002,83(3-4):143-148
While deep hydrodesulfurization of gas oil is more and more important, elimination of sulfur compounds such as 4,6-dialkyldibenzothio-phenes still attracts considerable attention. A new process based on the association of a separation process by charge-transfer complex (CTC) formation and classical catalytic hydrotreating (HDT) was evaluated. The results indicated that a CTC pretreatment allows the rate of hydrodesulfurization (HDS) to increase and the final sulfur level to decrease. This process is even more efficient for feeds difficult to desulfurize. 相似文献
7.
Kinetic Treatment for copolymerization of styrene or methyl methacrylate with N-phenylmaleimide
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Shirota‘s kinetic model and our kinetic model were used to treat the kinetic data of styrene (St) and N-phenylmaleimide (PMI) copolymerization in which chaxge-transfer complex (CTC) was formed. The results obtained by Shirota‘s kinetic model were disagreed with the experiments and the experimental phenomena could not be explained. The kinetic data of all feed fractions can be treated with our kinetic model, and the experimental phenomena can be explained from the propagation constants and reactivity ratios. Our kinetic model is also suitable for the kinetic data of methyl methacrylate (MMA) and PMI copolymerization in which CTC can not be formed. 相似文献
8.
K.M. Shaju V. Ganesh Kumar S. Rodrigues N. Munichandraiah A.K. Shukla 《Journal of Applied Electrochemistry》2000,30(3):347-357
Electrochemical studies on AB2 type Zr0.5Ti0.5V0.6Cr0.2Ni1.2 metal hydride electrodes with varying particle size suggests that the electrodes with alloy particles of about 60 m yield the optimum performance. The values for diffusion coefficient of hydrogen in the alloy particles > 25 m are found to be nearly invariant. Both a.c. impedance and linear polarization data on electrodes with varying particle size suggest that the charge-transfer resistance depends on state-of-charge of the electrodes. A comparison of scanning electron micrographs of fresh electrodes and subsequent to their prolonged charge-discharge cycling suggests that the metal hydride particles develop stress-induced cracks owing to their inherent expansion and contraction during the hydriding/dehydriding processes. 相似文献
9.
分别采用共沉淀法和超声波共沉淀法制备Al/Co复合掺杂α-Ni(OH)2样品A和B,用XRD和激光粒度仪表征样品的晶相结构和粒度分布。结果表明,样品B比样品A具有较多的晶格缺陷和较小的平均粒径。循环伏安特性及电化学阻抗谱测试显示,样品B比样品A具有更好的电化学性能:较好的反应可逆性、较低的电荷转移电阻和较高的循环寿命等。样品B的质子扩散系数为1.96×10-10cm2/s,约为样品A(9.78×10-11cm2/s)的2倍。充放电测试显示,样品B的放电比容量达到308mA·h/g,比样品A的放电比容量高25mA·h/g。 相似文献
10.