Analytical sciences : the international journal of the Japan Society for Analytical Chemistry,2004年20(3):537-541 ISSN：0910-6340
[Liu, GD] New Mexico State Univ, Dept Chem & Biochem, Las Cruces, NM 88003 USA.;Hunan City Coll, Dept Environm Chem & Engn, Yiyang 413049, Peoples R China.
[Liu, GD] New Mexico State Univ, Dept Chem & Biochem, Las Cruces, NM 88003 USA.
An amperometric immunosensor was constructed by dispersing graphite, schistosoma-japonicum antigen (SjAg) and silica sol-gel at low temperature. The performance characteristics of the prepared immunosensor were examined in the buffered solution of o-aminophenol (o-AP) used as a substrate. It exhibited excellent physical and electrochemical stability with a renewable external surface. A competitive binding assay was employed to determine schistosoma-japonicum antibody (SjAb) with the aid of horseradish peroxidase labeled SjAb (HRP-SjAb). The experimental parameters for SjAb assay were optimized, including the amount of labeled SjAb in incubation solution, incubation time, temperature and the pH of solution. The use of o-AP substrate and amperometric detection at -250 mV (vs. SCE) results in a determination limit of 0.32 microg/ml and a linear range extending up to 0.18 microg/ml. The results of SjAb assay in serum samples demonstrate the feasibility of using the proposed immunosensor for clinical analysis.
Electrochemical performances of LiCoO2 as a candidate material for supercapacitor are systematically investigated. LiCoO2 nanomaterials are synthesized via hydrothermal reaction with consequent calcination process. And the particle size increases as the calcination temperature rises.LCO-650 sample with the largest particle size displays the maximum capacitances of 817.5 Fg-1with the most outstanding capacity retention rate of 96.8% after 2000 cycles. It is shown that large particle size is beneficial to the electrochemical and structural stability of Li CoO2 materials. We speculate that the micron-sized waste LiCoO2 materials have great potential for supercapacitor application. It may provide a novel recovered approach for spent LIBs and effectively relieve the burdens on the resource waste and environment pollution.
International Journal of Hydrogen Energy,2014年39(21):11055-11060 ISSN：0360-3199
[Jiao, Lifang; Yuan, Huatang; Zhao, Yanping] Nankai Univ, Inst New Energy Mat Chem, Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Key Lab Adv Energy Mat Chem MOE,Tianjin Key Lab M, Tianjin 300071, Peoples R China.;[Zhong, Tongsheng; Ding, Liangzhong] Hunan City Univ, Coll Chem & Environm Engn, Yiyang 413000, Hunan, Peoples R China.
[Ding, Liangzhong] Hunan City Univ, Coll Chem & Environm Engn, Yiyang 413000, Hunan, Peoples R China.
2LiBH(4)/MgH2 system is a representative and promising reactive hydride composite for hydrogen storage. However, the high desorption temperature and sluggish desorption kinetics hamper its practical application. In our present report, we successfully introduce CoNiB nanoparticles as catalysts to improve the dehydrogenation performances of the 2LiBH(4)/MgH2 composite. The sample with CoNiB additives shows a significant desorption property. Temperature programmed desorption (TPD) measurement demonstrates that the peak decomposition temperatures of MgH2 and LiBH4 are lowered to be 315 degrees C and 417 degrees C for the CoNiB-doped 2LiBH(4)/MgH2. Isothermal dehydrogenation analysis demonstrates that approximately 10.2 wt% hydrogen can be released within 360 min at 400 degrees C. In addition, this study gives a preliminary evidence for understanding the CoNiB catalytic mechanism of 2LiBH(4)/MgH2 Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Spirocyclopentaneoxindole derivatives containing four consecutive stereocenters, including a spiro quaternary center, were constructed by an organocatalytic iminium–enamine cascade sequence in good yields (up to 86 %) with excellent enantiomeric (up to >99 % ee) and diastereomeric purities (up to >99:1 dr). This highly efficient procedure will allow diversity‐oriented syntheses of this intriguing class of compounds with potential biological activities.