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11.
Oluwatosin Emmanuel Bankole Chunxia Gong Lixu Lei 《Russian Journal of Electrochemistry》2014,50(9):891-898
The effect of recycling and doping LiMn1/3Ni1/3Co1/3O2 of lithium-ion battery with dimethyl sulfoxide (DMSO) instead of N-methylpyrrolidone (NMP) on the electrochemical performance of the battery has been investigated for the first time. Observation shows that preparing the cathode active materials with dimethyl sulfoxide will increase the conductivity of the battery. The results show that the as-recovered LiMn1/3Ni1/3Co1/3O2 modified with LiOH · H2O calcined at 450°C delivers discharge capacities of about 247 mA h g?1 in the first cycle with discharge efficiency of 83.1% in sample doped with dimethyl sulfoxide, and 189 mA h g?1 with discharge efficiency of 82.7% in N-methylpyrrolidone at the rate of 0.2 C. The asrecovered samples calcined at 800 and 850°C deliver 149 and 217 mA h g?1 in the fourth cycles respectively in dimethyl sulfoxide. The capacity loss observed in dimethyl sulfoxide faded with increase in cycle numbers. In general, for the samples doped with dimethyl sulfoxide, better performances were evident with high discharge capacities in powders calcined at a lower temperature than higher temperature in accordance with particle sizes shown by the SEM images. On the basis of better cyclic performance of lithium metal cathode and environmental safety, it is evident that relatively cheap dimethyl sulfoxide could replace N-methylpyrrolidone in battery formulations. The X-ray diffraction patterns revealed that LiMn1/3Ni1/3Co1/3O2 was successfully recycled by dimethyl sulfoxide. 相似文献
12.
Capillary isoelectric focusing tends to suffer from poor reproducibility, particularly for the analysis of complex protein
samples from cellular or tissue homogenates. This poor reproducibility appears to be associated with erratic variations in
electroosmotic flow. One cause of electroosmotic flow variation is degradation of the capillary coating caused by the extremely
basic solution commonly used during mobilization and focusing; this degradation of the capillary coating can be reduced by
employing a CAPS mobilization buffer at pH 9. Another cause of variation is protein adsorption to the capillary wall, which
causes an increase in electroosmotic flow. The effects of protein adsorption can be reduced by use of surfactants in the buffer
and by employing an extremely low sample loading. We report the use of CAPS mobilization buffer in combination with an ultrasensitive
laser-induced fluorescence detector for the reproducible analysis of ∼2 ng of protein from a Barrett's esophagus biopsy. 相似文献
13.
Patrick Rocca Francis Marsais Alain Godard Guy Quguiner Luqman Adams Babajide Alo 《Journal of heterocyclic chemistry》1995,32(4):1171-1175
The paper describes a convenient synthesis of hydroxy-β-carbolines from commercial anisidines based on key steps such as metalation, cross-coupling and cyclization. The first total synthesis of a major cyto-toxic constituent of a marine bryozoan is also reported, the 8-hydroxy-1-vinyl-β-carboline. 相似文献
14.
Charles D. Hufford Babajide Oguntimein Michael Martin Jon Clardy 《Tetrahedron letters》1984,25(4):371-374
The isolation and structure determination of syncarpurea (1), a novel urea from is reported. 相似文献
15.
We present a design for a sheath-flow cuvette that uses a relatively inexpensive quartz cuvette. The cuvette has a high optical quality square flow chamber that is fused to quartz tubes at each end. PEEK/TEFZEL fittings hold and seal the quartz flow chamber without putting strain on the cuvette. The performance of the cuvette is evaluated as a laser-induced fluorescence detector for capillary electrophoresis. The cuvette produces mass detection limits of 50 yoctomoles (30 copies) for 5-carboxyl tetramethylrhodamine (5 TAMRA SE) with a separation efficiency of 400,000 theoretical plates. 相似文献
16.
Patrick Rocca Francis Marsais Alain Godard Guy Quéguiner Luqman Adams Babajide Alo 《合成通讯》2013,43(21):3373-3379
An original and short synthesis of Eudistomin T is reported. The approach is based on a convergent methodology which involves such reactions as metalation, heteroring cross-coupling and cyclization. 相似文献
17.
Roza Wojcik Oluwatosin O. Dada Martin Sadilek Norman J. Dovichi 《Rapid communications in mass spectrometry : RCM》2010,24(17):2554-2560
We report a simple nanospray sheath‐flow interface for capillary electrophoresis. This interface relies on electrokinetic flow to drive both the separation and the electrospray; no mechanical pump is used for the sheath flow. This system was interfaced with an LCQ mass spectrometer. The best results were observed with a 2‐µm diameter emitter tip and a 1‐mm spacing between the separation capillary tip and the emitter tip. Under these conditions, mass detection limits (3σ) of 100 amol were obtained for insulin receptor fragment 1142‐1153. The separation efficiency exceeded 200,000 plates for this compound. The relative standard deviation generated during continual infusion of a 50 µM solution of angiotensin II was 2% for the total ion count and 3% for the extracted ion count over a 40‐min period. Finally, the interface was also demonstrated for negative ion mode. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
18.
Odejayi Oluwatosin Aderinsola Adesiji Nkiruka Eunice Ademola Janet Ayobami 《Journal of Radioanalytical and Nuclear Chemistry》2022,331(6):2545-2551
Journal of Radioanalytical and Nuclear Chemistry - The activity concentrations of natural radionuclides in soil from playground were determined by gamma spectrometry using NaI(Tl) detector. Annual... 相似文献