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PHOTOCHEMICAL REACTION, ACIDICHROMISM AND SUPRAMOLECULAR NANOARCHITECTURES IN THE LANGMUIR-BLODGETT FILMS OF AN AMPHIPHILIC STYRYLQUINOXALINE DERIVATIVE

PHOTOCHEMICAL REACTION, ACIDICHROMISM AND SUPRAMOLECULAR NAN...

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Asia Conference on Nanoscience and Nanotechnology Abstracts Book

作者： MEIFANG YIN HAOFEI GONG BAOWEN ZHANG MINGHUA LIUCAS Key Laboratory of Colloid and Interface Science institute of chemistry CAS Beijing 100080 chinatechnical institute of physics and chemistry CAS Beijing 100101 China

＜正＞ An amphiphilic styrylquinoxaline derivative, 3-（4-（hexadecyloxy）styryl）quinoxalin-2（1H）-one （SQC16）, was newly synthesized to investigate their photochemical and gas responsive properties in the organized molecular films. It was observed that SQC16 can spread as a monolayer on the subphases with various pH values and can be subsequently transferred onto solid substrates. While SQC16 showed predominantly reversible trans-cis photoisomerization in the methanol solution, it showed both photoisomerization and photodimerization in the LB film. The photodimerization was only observed in the LB film due to the face-to-face arrangement of the functional headgroup in the LB film and the process was irreversible. In addition, the LB film showed an acidichromism, i.e. when the film was exposed to HCl gas it turned its color from yellow to red and the color could be recovered after exposing to NH3 gas. The process was reversible and could be repeated many times. Interesting surface morphology of the SQC16 LB film was revealed. It was observed that SQC16 can form nanowire architecture in the transferred one-layer LB film. Such morphology can be changed upon photoirradiation or in gas reactions. Through the AFM measurements, it was suggested that the photodimerization predominantly occurred from the nanowire structures, while during the acidichromism the reaction occurred preferentially in the flat region. XRD studies revealed that while layer distance showed a slight change for the LB film during the acidichromism and photoreaction, the layer structure of SQC16 LB film was kept.

关键词： photodimerazation acidchromism Langmuir-Blodgett

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Meet Our New Associate Editors

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Chinese Journal of chemistry 2024年第11期42卷 1319-1321页

作者： Editorial Office of Chinese Journal of chemistry 不详

Associate Editor Dehui Deng Professor The State Key Laboratory of Catalysis Dalian institute of Chemical physics,Chinese Academy of Sciences,China(+86)0411-82463870,dhdeng@***,https:/***/.Education:2003-2007 B.S.,Light Industry Engineering and National Economy Management,Sichuan University.2007-2013 Ph.D.,Physical chemistry,Dalian institute of Chemical physics,Chinese Academy of Sciences(Supervisor:*** Bao and *** Pan).

关键词： Dalian Economy Associate

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Trace tritium recovery from the residue of liquid Li_(17)Pb_(83) alloy

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Science China chemistry 2010年第8期53卷 1825-1828页

作者： XIE Bo,YANG TongZai & WENG KuiPing institute of Nuclear physics and chemistry,China Academy of Engineering physics,Mianyang 621900,China 1. institute of Nuclear physics and chemistry China Academy of Engineering Physics Mianyang 621900 China

The liquid Li17Pb83 alloy is a prominent breeder material for use in a fusion *** the design of an effective tritium extraction system for the liquid lithium lead bubbler of the test blanket module of such a reactor,finding ways to strictly limit the losses of tritium and to minimize radioactive risks is very *** this purpose,the isotope exchange process has been investigated as a means of trace tritium recovery from a model of the residue from Li17Pb83 *** results indicate that the isotope exchange process is an effective means of tritium recovery from the residue of Li17Pb83 alloy,and the optimum composition of the exchange carrier gas is He + 0.1% *** exchange temperature and number of exchange steps are the main factors influencing the efficiency of tritium recovery from the *** tritium recovery efficiency increases with increasing exchange temperature and number of times of *** recovery efficiency can approach 80% when the residue is treated six times at 823 K.A gas-liquid two-phase contact model to describe the proceeding of tritium release from the liquid Li17Pb83 alloy has been derived on the basis of this experiment.

关键词： Li17Pb83 alloy tritium recovery isotope exchange carrier

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MELTING CRYSTALLIZATION BEHAVIOR OF NYLON 66

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Chinese Journal of Polymer Science 2001年第3期19卷 237-246页

作者： Qing-xin Zhang Zhi-shen Mo State Key Laboratory of Polymer physics & chemistry Changchun institute of Applied chemistry Chinese Academy of Sciences, Changchun 130022, China Chinese Acad Sci Changchun Inst Appl Chem State Key Lab Polymer Phys & Chem Changchun 130022 Peoples R China

Analysis of isothermal and nonisothermal crystallization kinetics of nylon 66 was carried out using differential scanning calorimetry (DSC). The commonly used Avrami equation and that modified by Jeziorny were used, respectively, to fit the primary stage of isothermal and nonisothermal crystallizations of nylon 66. In the isothermal crystallization process, mechanisms of spherulitic nucleation and growth were discussed. The lateral and folding surface free energies determined from the Lauritzen-Hoffman treatment are sigma = 9.77 erg/cm(2) and sigma (e) = 155.48 erg/cm(2), respectively; and the work of chain folding is q = 33.14 kJ/mol. The nonisothermal crystallization kinetics of nylon 66 was analyzed by using the Mo method combined with the Avrami and Ozawa equations. The average Avrami exponent (n) over bar was determined to be 3.45. The activation energies (DeltaE) were determined to be -485.45 kJ/mol and -331.27 kJ/mol, respectively, for the isothermal and nonisothermal crystallization processes by the Arrhenius and the Kissinger methods.

关键词： nylon 66 crystallization kinetics activation energy

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PREPARATION OF BISPHENOL A EPOXY RESIN WATERBORNE DISPERSIONS BY THE PHASE INVERSION EMULSIFICATION TECHNIQUE

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Chinese Journal of Polymer Science 2000年第1期18卷 33-38页

作者： Zhen-zhong Yang De-lu Zhao Polymer physics Laboratory, institute of chemistry, Chinese Academy of Sciences, Beijing 100080, China Chinese Acad Sci Inst Chem Polymer Phys Lab Beijing 100080 Peoples R China

The phase inversion emulsification technique (PIET) is an effective physical method for preparing waterborne dispersions of polymer resins. Some results concerning the preparation of bisphenol A epoxy resin waterborne dispersions by PIET in our laboratory were summarized. Electrical properties, rheological behavior and morphological evolution during phase inversion progress were systematically characterized. The effects of the emulsifier concentration and emulsification temperature on phase inversion progress and the structural features of the waterborne particles were studied as well. The deformation and break up of water drops in a shear field were analyzed in terms of micro-theology, while the interaction and coalescence dynamics of water drops were discussed in terms of DLVO theory and Smoluchowski effective collision theory, respectively. Based on the experimental results and theoretical analysis, a physical model of phase inversion progress was suggested, by which the effects of the parameters on phase inversion progress and the structural features of the waterborne particles were interpreted and predicted.

关键词： phase inversion emulsification waterborne dispersions epoxy resin mechanism physical model

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Luminescence of RE^(3+) and energy transfer from Gd^(3+) to RE^(3+) (RE = Dy, Eu) in SrGdAlO_4:RE^(3+)

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Chinese Journal of chemistry 1997年第1期15卷 60-67页

作者： LIU, Sheng-Li SU, QiangLaboratory of Rare Earth chemistry and physics, Changchun institute of Applied chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China Laboratory of Rare Earth chemistry and physics Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun Jilin 130022 China [*]Laboratory of Rare Earth chemistry and physics Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun Jilin 130022 China

Spectral properties of Gd3+, Dy3+ and Eu3+ ions in SrGdAlO4 are reported in detail. A cooperative vibronic transition of Gd3+ and the emission from the higher 5DJ (J=1, 2, 3) levels of Eu3+ were observed. Energy transfer occurs from Gd3+ to Dy3+ and to Eu3+. The influence of Gd3+ and Dy3+ concentrations on the luminescence intensity is discussed.

关键词： Luminescence energy transfer rare earth aluminate

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Chemical Bond Parameters in Sr_3MRhO_6(M=Rare earth)

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Chinese Chemical Letters 2000年第8期11卷 747-748页

作者： Zhi Jian WU, Si Yuan ZhANG (Laboratory of rare earth chemistry and physics, Changchun institute of Applied chemistry, Chinese Academy of Sciences, Changchun 130022) Chinese Acad Sci Changchun Inst Appl Chem Lab Rare Earth Chem & Phys Changchun 130022 Peoples R China

Chemical bond parameters, that is, bond covalency, bond valence, macroscopic linear susceptibility, and oxidation states of elements in Sr3MRhO6(M-Sm, Eu, Tb, Dy, Ho, Er, Yb) have been calculated. The results indicate that the bond covalency of M-O decreases sharply with the decrease of ionic radius of M3+ from Sm to Yb, while no obvious trend has been found for Rh-O and Sr-O bonds. The global instability index indicates that the crystal structures of Sr3MrhO6(M=Sm, Eu, Tb, Dy, Ho) have strained bonds.

关键词： Chemical bond parameters Sr3MRhO6.

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Luminescent properties of Ba_3(PO_4)_2:Eu,Tb phosphors

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Chinese Journal of chemistry 1996年第5期14卷 399-403页

作者： GAO,Yong SHI,Chun-ShanLaboratory of Rare Earth chemistry and physics,Changchun institute of Applied chemistry,Chinese Academy of Sciences,Changchun,Jilin 130022,China Laboratory of Rare Earth chemistry and physics Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun Jilin 130022 China

Luminescence of europium (Ⅲ),europium(Ⅱ) and terbium(Ⅲ) has been observed in Bas(PO4)2:Eu,Tb phosphors which are synthesized in air *** valence state of europium is influenced by amount of *** is notable that the relative intensity of the emission spectra peaks corresponding to Eu2+ is increased if the amount of Tb3+ is *** phenomena can be explained by an electron transfer *** predict a new kind of two-rare-earth codoped trichromatic phosphors in Ba3(PO4)2 matrix.

关键词： Luminescence europium terbium phosphor

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A New High Efficiency Green Luminescent Material──the System Al_2O_3-B_2O_3 Containing Ce^(3+) and Tb^(3+) Ions

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Chinese Chemical Letters 1998年第9期9卷 877-880页

作者： Hong Peng YOU Guang Yan HONG (Laboratory of Rare Earth chemistry and physics, Changchun institute of Applied chemistry,Chinese Academy of Sciences, Changchun 130022) Chinese Acad Sci Changchun Inst Appl Chem Lab Rare Earth Chem & Phys Changchun 130022 Peoples R China

To obtain high efficiency luminescent materials, the system Al2O3-B2O3 containing Ce3+ andTb3+ ions with variation of B2O3-content, has been prepared by Al2O3, H3BO3, CeO2 and Tb4O7 underreducing atmosphere at 1250i . It is notable that the brightness of the sample with appropriatecomposition is similar to that of commercial phosphorous containing Ce3+ and Tb3+, indicating that a newhigh efficency green luminescent material was obtained with appropriate B2O3-content.

关键词： the system Al_2O_3-B_2O_3 Ce^(3+) and Tb^(3+) ions a new high efficent green phosphorous

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THERMALLY STIMULATED SHAPE MEMORY BEHAVIOR OF POLYMERS WITH PHYSICAL CROSSLINKS

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Chinese Journal of Polymer Science 1999年第3期17卷 203-213页

作者： Mao Xu Feng-kui Li Polymer physics Laboratory, institute of chemistry, Chinese Academy of Sciences, Beijing 100080, China Chinese Acad Sci Inst Chem Polymer Phys Lab Beijing 100080 Peoples R China

The shape memory effect of polymers was investigated for the purpose of improving the processing conditions of their preparation and broadening the list of polymers for shape memory applications. Emphasis was put on the possibility of using polymers with physical crosslinks as shape memory materials and their structure-function relationships. Segmented block polyurethanes and polyethylene/nylon 6 graft copolymers were used as examples of polymers with physical crosslinks. It was found that these copolymers can really be used as thermally stimulated shape memory materials with large recoverable strain and high final recovery rate. The main advantage of using copolymers is their improved processing conditions as compared with polymers with chemical crosslinks. As only physical crosslinks are introduced, all conventional processing techniques for thermal plastics can be used, and the materials become easily reusable. The results indicate that the high crystallinity of these copolymers at room temperature and the formation of stable physical crosslinks are the two prerequisites for these polymers to exhibit shape memory effect. The successful use of block and graft copolymers imply the possibility of using polymers of various structure and properties as shape memory materials.

关键词： shape memory effect segmented polyurethanes polyethylene nylon graft copolymers

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