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Li X.,Nanjing Southeast University | Huang H.,Nanjing Southeast University | Zhu Y.,Nanjing Southeast University | Zhao H.,Nanjing Southeast University | And 2 more authors.
RSC Advances | Year: 2015

A highly selective chemodosimeter based on 1,8-naphthalimide for Pd2+/4+ species via a Claisen rearrangement was developed, which not only discriminated Pd from competing Pt species, but also distinguished Pd in an oxidized state without altering its oxidation states from Pd0. Under optimized reaction conditions, the detection limit can reach 1.4 μM for Pd2+. © The Royal Society of Chemistry 2016.

Tian F.,Nanjing Southeast University | Xie Y.,Nanjing Southeast University | Xie Y.,Suzhou University | Xie Y.,Jiangsu Key Laboratory of Advanced Metallic Materials
Journal of Nanoparticle Research | Year: 2015

Lithium manganese oxide intercalation compound (Li0.7MnO2) supported on titanium nitride nanotube array (TiN NTA) was applied as cathode electrode material for lithium-ion supercapacitor application. Li0.7MnO2/TiN NTA was fabricated through electrochemical deposition and simultaneous intercalation process using TiN NTA as a substrate, Mn(CH3COO)2 as manganese source, and Li2SO4 as lithium source. The morphology and microstructure of the Li0.7MnO2/TiN NTA were characterized by scanning electron microscopy and X-ray diffraction analysis. The electrochemical performance of the Li0.7MnO2/TiN NTA was investigated by electrochemical impedance spectroscopy, cyclic voltammetry, and galvanostatic charge/discharge measurements. Li0.7MnO2/TiN NTA exhibited higher capacitive performance in Li2SO4 electrolyte solution rather than that in Na2SO4 electrolyte solution, which was due to the different intercalation effects of lithium-ion and sodium-ion. The specific capacitance was improved from 503.3 F g−1 for MnO2/TiN NTA to 595.0 F g−1 for Li0.7MnO2/TiN NTA at a current density of 2 A g−1 in 1.0 M Li2SO4 electrolyte solution, which was due to the intercalation of lithium-ion for Li0.7MnO2. Li0.7MnO2/TiN NTA also kept 90.4 % capacity retention after 1000 cycles, presenting a good cycling stability. An all-solid-state lithium-ion supercapacitor was fabricated and showed an energy density of 82.5 Wh kg−1 and a power density of 10.0 kW kg−1. © 2015, Springer Science+Business Media Dordrecht.

Wang Z.,Nanjing Southeast University | Wang Z.,Jiangsu Key Laboratory of Advanced Metallic Materials | Yang J.,Nanjing Southeast University | Jiang Y.,Nanjing Southeast University | And 4 more authors.
Analytical Methods | Year: 2015

To overcome the problem of non-specific silver precipitation occurring in the traditional silver staining, this work presents a new strategy for signal amplification by labeling the biological molecule with Pd/GO nanoparticles (NPs), which further act as catalysts to reduce copper ions to metallic copper to enhance the signal (denoted as "Pd/GO label copper stain" later). Based on this strategy, the electrochemical detection of a single-base mutation associated with the breast cancer gene TOX3 is specially studied by employing differential pulse voltammetry (DPV). The analytical performance of this system shows that after 15 min of copper staining there is a linear relationship between the peak current resulting from the oxidative dissolution of the copper deposit and the logarithm of the target DNA concentration in the range of 10 μM to 1 pM. The limit of detection can reach 1 pM, which benefits from the high catalytic activity of Pd/GO NPs along with a low background level of "Pd/GO label copper stain". Therefore, this process can be expected to be a good alternative to silver staining used in nanomaterial-based signal amplification strategies in future. © 2015 The Royal Society of Chemistry.

Mao Y.,Nanjing Southeast University | Mao Y.,Jiangsu Key Laboratory of Advanced Metallic Materials | Dong Y.,Nanjing Southeast University | Dong Y.,Jiangsu Key Laboratory of Advanced Metallic Materials | And 8 more authors.
Materials Science and Engineering C | Year: 2011

A recently developed process of microsphere preparation, named droplet-freezing process is introduced in this paper. The PLLA microspheres were fabricated by the droplet-freezing process, the diameter and porosity of the microspheres were measured, and the micro-morphologies of the microspheres were characterized by scanning electron microscopy (SEM). The formation process of microspheres was achieved by two steps: first, after droplets dropped off the delivery tube, they became approximately spherical in the air under the effect of the surface tension; second, droplets dropped into liquid condensate and maintained the spherical shape, and were frozen during the free settling process. Experimental results indicated that the microspheres fabricated by the droplet-freezing process have uniform diameters and the diameter can be controlled properly, along with the increase of the PLLA concentration, the size of microspheres increases, but the porosity of the microspheres decreases. The microspheres with high porosity can be obtained with a low concentration of the PLLA solution. SEM analysis revealed that the surfaces and interiors of the microsphere contain plentiful and interconnected micro pores. The microspheres are hopeful to be applied in bone tissue engineering. © 2009 Elsevier B.V. All rights reserved.

Zhan L.,Nanjing Southeast University | Zhan L.,Jiangsu Key Laboratory of Advanced Metallic Materials | Zhang Y.,Nanjing Southeast University | Zhang Y.,Jiangsu Key Laboratory of Advanced Metallic Materials | And 8 more authors.
Journal of Alloys and Compounds | Year: 2016

The ternary Mg67-xPdxCo33 (x = 1, 3, 5, 7) alloys were prepared and served as anode materials for the Ni-MH battery system. Pd facilitates the formation of a full body-centered cubic (BCC) phase in binary Mg67Co33. All Mg67-xPdxCo33 (x = 1, 3, 5, 7) alloys possess BCC structure in nano-crystalline, which were observed by XRD and TEM analyses. In addition, their lattice parameters increase with the augmentation of Pd content. The charge-discharge experiments show that Mg64Pd3Co33 owns the maximum discharge capacity of 624 mAh g-1 among Mg67-xPdxCo33 (x = 1, 3, 5, 7) electrodes, which was greatly enhanced from our previously studied binary Mg-Co and ternary Mg-Co-Pd electrodes. All electrochemical kinetics e.g. exchange current density, hydrogen atomic diffusion capability were improved by substituting Pd for Mg, which were also relevant with the increment of Pd amount in the alloys. X-ray photoelectric spectroscopy (XPS) and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) demonstrated that Pd relieved the severe corrosions and capacity degradations of the electrodes. © 2015 Elsevier B.V. All rights reserved.

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