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Zhu X.,Yanshan University | Pei L.,Yanshan University | Zhao Z.,Yanshan University | Liu B.,Yanshan University | And 2 more authors.
Journal of Alloys and Compounds | Year: 2013

A systematic investigation was performed on the hydrogen storage properties of composites which were prepared by ball milling MgH2 with different amounts of LaH3 and the catalysis mechanism of La hydride on MgH 2 was reported in this paper. Pressure-Composition-Temperature (P-C-T) curves showed that the reversible hydrogen storage capacity of MgH 2 + 20 wt.% LaH3 composite was 5.1 wt.% at 548 K, while the pure MgH2 hardly released any H2 under the same conditions. The addition of LaH3 also significantly improved the hydriding/dehydriding kinetics, and led to the rate-controlling steps of MgH2 becoming altered from a three-dimensional interfacial reaction to a one-dimensional diffusion process. The XRD pattern indicated that the LaH3 phase partially transformed to LaH2.3 phase during the dehydriding process. TEM micrograph images revealed that the LaH 2.3 phase was distributed homogeneously throughout the Mg phase and that the Mg crystals were coated with LaH2.3 crystals in the matrix. This microstructure exhibited an obvious volume contraction and resulted in a distinct strain of MgH2 when the LaH3 phase released H2. DSC curves proved that the addition of LaH3 could decrease the temperature at which the onset of the dehydrogenation of MgH 2 occurred by approximately 20.4 K. © 2013 Elsevier B.V. All rights reserved.

Wang J.,Yanshan University | Han S.,Yanshan University | Ke D.,Yanshan University | Wang R.,Nordion Inc.
Journal of Nanomaterials | Year: 2012

Semiconductor Quantum dots (QDs) have generated extensive interest for biological and clinical applications. These applications arise from their unique properties, such as high brightness, long-term stability, simultaneous detection of multiple signals, tunable emission spectra. However, high-quality QDs, whether single or core-shell QDs, are most commonly synthesized in organic solution and surface-stabilized with hydrophobic organic ligands and thus lack intrinsic aqueous solubility. For biological applications, very often it is necessary to make the QDs dispersible in water and therefore to modify the QD surfaces with various bifunctional surface ligands or caps to promote solubility in aqueous media. Well-defined methods have been developed for QD surface modification to impart biocompatibility to these systems. In this review, we summarize the recent progress and strategies of QDs surface modification for potential cancer diagnostic and therapeutic applications. In addition, the question that arose from QD surface modification, such as impact of size increase of QD bioconjugates after surface-functionalization or surface modification on photophysical properties of QDs, are also discussed. © 2012 Jidong Wang et al.

Zhang L.-J.,Beijing Normal University | Chen H.-L.,Beijing Normal University | Li Z.-F.,Beijing Normal University | Lu Z.-L.,Beijing Normal University | Wang R.,Nordion Inc.
Inorganic Chemistry Communications | Year: 2012

A new [12]aneN 3-based fluorescent sensor 3 has been efficiently synthesized through click chemistry. This sensor demonstrates high selectivity for Zn(II) ions in aqueous solution at pH 7.2, even in the presence of other competitive cations. © 2012 Elsevier B.V.

Nordion Inc. | Date: 2012-05-21

A bifunctional polyazamacrocyclic chelating agent of the formula (I): wherein: and the variables A, L, Q, Q

A method of treating an adsorbent for a chromatographic separation. The method involves sonicating particles of an inorganic metal oxide having fragile edges in the absence of any alkylating or acylating agent to form smoothened particles of the inorganic metal oxide and washing the smoothened particles of the inorganic metal oxide to remove fine particulate matter to produce a treated adsorbent. The treated adsorbent can be used in a method of isolating a daughter radioisotope from a daughter radioisotope that is produced from the parent radioisotope by radioactive decay.

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