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Investigation of solvatochromism and aggregation behavior of C_(60)(C_4H_(10)N^+)I^- in binary solvent mixtures

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Chinese Science Bulletin 2003年第18期48卷 1938-1942页

作者： WANG Guanwu1, HAO Erhong1, JIAO Lijuan1 & YAN Lifeng2 1. department of Chemistry, University of Science and Technology ofchina, Hefei 23.026, china 2. department of Chemical physics, University of Science and Technol-ogy of china, Hefei 23.026, china correspondence should be addressed to Wang Guanwu (e-mail: gwang @***) department of Chemistry University of Science and Technology of China Hefei 230026 China department of Chemical physics University of Science and Technology of China Hefei 230026 China

Water-soluble N,N-dimethyl[60]fulleropyrro-lidinium iodide (C60(C4H10N+)I-), when dissolved in binarymixtures of tetrahydrofuran and water, was found to exhibit remarkable solvatochromism. Correspondingly, the UV-vis spectra showed obvious changes by variation of the solventcomposition of tetrahydrofuran and water. It was found that both concentration and temperature had strong influence on the stability of monomer-state C60(C4H10N+)I-, while theyhad little effect on the stability of aggregated C60(C4H10N+) I-The formation of cluster was confirmed by TEM and AFMmeasurements.

关键词： N N-dimethylfulleropyrrolidinium iodide solvato-chromism aggregation.

Experimental Study of Segregation Patterns in Binary Granular Mixtures under Vertical Vibration

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Experimental Study of Segregation Patterns in Binary Granula...

Co Content Dependence of Crystal Structure and Specific Magnetization of Fe_(1-x)Co_x-SiO_2 Granules Prepared by Sol-Gel Method

CCAST“颗粒物理”研讨会

作者： SHI Qingfan, YAN Xuequn, HOU Meiying, NIU Xiao juan, LU Kunquan 1 Institute of physics, Chinese Academy of Sciences, Beijing 100080, china 2 department of physics, Beijing Institute of Technology, Beijing, 100081, china correspondence should be addressed to Lu Kunquan (e-mail: lukq@***)

＜正＞ We report the experimental observations of the segregation patterns in initially well mixed copper and glass spheres subjected to a vertical sinusoidal vibration at different values of acceleration гand frequency f. A segregation phase diagram is obtained, which includes Brazil nut （BN）, Reversed-BN （RBN） and "Sandwich" segregation patterns at different гand f. The stable RBN segregation is experimentally found for the first time, in which large heavy particles move down to the bottom and form the lower-layer while small particles rise to the top and form an upper-layer. The boundary values （г, f）, which separate regions of different patterns, depend on system’s initial condition;i.e., hysteresis exists.

关键词： granular matter Reverse Brazil nut (RBN) vibration Sandwich

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Journal of Materials Science & Technology 1999年第4期15卷 390-390页

作者： Guide TANG Wei CHEN Jianguo ZHAO Denglu HOU Ying LIU Chengfu PAN and Xiangfu NIE(department of physics, Hebei Normal University, Shijiazhuang 050016, Hebei, china)To whom {3. should be addressed E-mail: dlhou@*** department of physics Hebei Normal University Shijiazhuang 050016 Hebei China

The Co content dependence of crystal structure and specific magnetization of Fe1-xCox-SiO2granular solid prepared by the sol-gel method have been studied. It is found that the crystal structure, Iattice parameter and ... 详细信息

关键词： SiO x)Cox-SiO2 Granules Prepared by Sol-Gel Method Fe Co Content Dependence of Crystal Structure and Specific Magnetization of Fe

Speciflc Heat-Phonon Spectrum Inversion Problem of High T_c Superconductor

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Journal of Materials Science & Technology 1999年第4期15卷 381-381页

作者： Guicun MA(Institute of Applied physics and Computational Mathematics, Beijing 100088, china)Xianxi DAI(department of physics, Fudan University, Shanghai 20043., china)To whom correspondence should be addressed E-mail: Js6s@***

The phonon density of states of YBa2Cu3.6.92 is obtained with the method of Fourier decon-volution and Tikhonov-s regularization technique from the experimental specific heat data. The result is compared with that of ... 详细信息

关键词： Chen Speciflc Heat-Phonon Spectrum Inversion Problem of High T_c Superconductor

Preparation and Magnetic Properties of (Fe_7Co_3._(0.15)(SiO_2)_(0.85)Granular Solids Using the Sol-Gel Method

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Journal of Materials Science & Technology 1999年第4期15卷 389-389页

作者： Wei CHEN Denglu HOU Ying LIU Guide TANG Minggang ZHU Jianguo ZHAO Xiangfu NIE and Hongyan WU(department of physics, Hebei Normal University, Shijiazhuang 050016, Hebei, china)To whom {3. should be addressed E-mail: dlhou@*** Hebei Normal Univ Dept Phys Shijiazhuang 050016 Hebei Peoples R China

(Fe7Co3.0.15(SiO2)0.85 granular alloy solid was prepared successfully using sol-gel method. The samples with different reducing temperatures were investigated by X-ray diffractometer(XRD),transmission electron micrography(TEM) and vibrating sample magnetometer(VSM). The av-erage particIe sizes of the samples were also calculated from Scherrer formula. The magnetic properties of (Fe7Co3.)o. 15 (SiO2)0.85 were studied in detail.

关键词： SiO2 Fe7Co3 Preparation and Magnetic Properties of Granular Solids Using the Sol-Gel Method