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1. Synthesis and characterization of Lead sulfate/ graphene nano sheets composites as anode materials for lead acid battery | |||
MA Jingliang,WANG Dianlong | |||
Chemistry 16 January 2013 | |||
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Abstract:In this paper, we have used a simple impregnation way to synthesize lead sulfate/graphene nano sheets (GNS) composites in order to make lead sulfate available for being used as negative active materials of lead acid battery. Compared with pure lead sulfate electrodes, the composite electrodes display higher specific capacity and rechargeable performance under high rates charge and discharge. The electrochemical characteristic of the composites electrode has been investigated by cyclic voltammetry (CV) and battery tests. The cyclic voltammetry results show that capacitive effect of graphene nano sheets becomes more obvious with the increases of scanning rates, meanwhile hydrogen evolution also enhances. The battery charge-discharge curves confirm that graphene nano sheets can help improve the capacity of lead sulfate, and graphene nano sheets improve the charging voltage. The composites are characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM) whose results show that lead sulfate particles are well dispersed on surface of graphene nano sheets instead of agglomerate whether for raw materials or negative active materials after charge and discharge. The morphologies characterization and electrochemical tests demonstrate that synthetic composites can be used as negative active materials and graphene nano sheets can promote dispersion and electrochemical performance of lead sulfate. | |||
TO cite this article:MA Jingliang,WANG Dianlong. Synthesis and characterization of Lead sulfate/ graphene nano sheets composites as anode materials for lead acid battery[OL].[16 January 2013] http://en.paper.edu.cn/en_releasepaper/content/4515367 |
2. Preparation of Silymarin Nanosuspension by Microemulsion Dilution | |||
Zeng Hui ,Huihua Li | |||
Chemistry 14 September 2011 | |||
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Abstract:Nanosuspensions of silymarin with size distribution 31-326nm were prepared though microemulsion dilution. Dynamic light scattering showed that the size of nanoparticles of silymarin changed by increasing the volume of diluted water. Transmission electron microscopy confirmed that these colloidal nanoparticles have irregular shape. This research shows that silymarin nanoparticles can be formed from microemulsion with suitable oil and surfactant. | |||
TO cite this article:Zeng Hui ,Huihua Li. Preparation of Silymarin Nanosuspension by Microemulsion Dilution[OL].[14 September 2011] http://en.paper.edu.cn/en_releasepaper/content/4442628 |
3. NXAl3+(X=N, P, As): Penta-atomic planar tetracoordinate nitrogen with N-X multiple bonding | |||
Cui zhonghua,Ding Yihong | |||
Chemistry 20 December 2010 | |||
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Abstract:The planar tetracoordinate nitrogen (ptN) has been successfully extended as a new branch of planar chemistry in both theory and experiment. As the simplest ptN, the penta-atomic species, i.e., pptN (e.g., NAl4-), is known to have the "delocalized" molecular environment with the single bonding between the central N and the ligand. In this paper, through the extensive isomeric search of a series of group V-based systems NXAl3+ (X=N, P and As) in both singlet and triplet electronic states at the B3LYP/6-311+G(d) level, we report a class of novel pptN with unique chemical bonding, i.e., the central nitrogen and the connected ligand X (X=N, P and As) effectively form a highly "localized" N-X multiple bonding, as confirmed by the aug-cc-pVTZ-B3LYP and MP2 calculations. The high-level CCSD(T)/aug-cc-pVTZ energetic calculations show that the three pptN species each have appreciable kinetic stability against structural transformation and fragmentation, which is confirmed by the Born-Oppenheimer molecular dynamics calculations. In particular, the pptN isomer with X=P, i.e., NPAl3+, is the corresponding global minimum. Thus, we propose that the three pptN isomers can be realized via the mass spectroscopic techniques. Possible formation pathways of the three pptNs are discussed. The present work demonstrates that the frequently used concept "localization vs delocalization" in organic chemistry can also be transplanted to the exotic planar chemistry like pptN. | |||
TO cite this article:Cui zhonghua,Ding Yihong. NXAl3+(X=N, P, As): Penta-atomic planar tetracoordinate nitrogen with N-X multiple bonding[OL].[20 December 2010] http://en.paper.edu.cn/en_releasepaper/content/4399215 |
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