3‐Aryl/alkyl‐2‐quinolones were synthesized employing microwave assisted multicomponent reaction of 2‐iodoanilines, terminal alkynes and oxalic acid dihydrate ((CO2H)2 ⋅ 2H2O) under polystyrene supported palladium (Pd@PS) nanoparticles‐catalyzed conditions. The use of a heterogeneous palladium catalyst was explored first time for 2‐quinolone synthesis involving carbonylation reaction employing (CO2H)2 ⋅ 2H2O as a solid and bench stable carbon monoxide (CO) source. The reaction exhibited good substrate generality for 2‐iodoanilines and alkynes with wide functional group tolerance and good regio‐selectivity. The ligand free operation, recyclability of heterogeneous Pd@PS catalyst and use of bench stable C1 source are the invaluable merits of the protocol.
Herein, a strategy is demonstrated to effectively control the sodium polysulfide dissolution using composite polymer blend membrane. The sufficient interconnected pores in the white graphite introduced polymer blend membrane plays a multifunctional role as an ion selective membrane, evident from the ionic conductivity of 10−3 S cm−1 facilitating the movement of sodium ions and the presence of boron and nitrogen in white graphite acts as an effective absorbent to trap sodium polysulfides. The electrochemical testing reveals significant improvement of about 87.6% in specific capacity when compared to the cell without white graphite@ polymer membrane. Also, the cell exhibits an excellent cycling stability with a capacity retention of 83.1% at the end of 500 cycles. Other than the performance enhancement, the self‐discharge battery is significantly reduced using the developed membrane. The better performance of the room temperature sodium sulfur battery is attributed to the physical and chemical confinement of composite polymer membrane which is also evident from the post analysis study. This is the first attempt of utilizing composite polymer membrane as a blocking layer in room temperature sodium sulfur batteries and is promising for the construction of high performance batteries. 相似文献
Wireless Networks - In this article, we propose a novel routing algorithm for wireless sensor network, which achieves uniform energy depletion across all the nodes and thus leading to prolonged... 相似文献
Protection of Metals and Physical Chemistry of Surfaces - Dense alumina coatings were fabricated over aluminum alloy via dip coating method using oxime-modified aluminum(III) isopropoxide as a... 相似文献
Heat source models are mathematical expressions that represent the generation term in the fundamental heat transfer equation. Investigators have successfully demonstrated different heat source models for single-wire welding. The present investigation estimates the double ellipsoidal heat source model parameters for twin-wire application. The heat source model parameters have been estimated for varying set of welding conditions. It has been found that the heat source model parameters for twin-wire welding are different from the single-wire welding. Moreover, the heat source model parameters also depend upon process parameters. Effects of welding current, electrode polarity and wire diameter on the size of heat source model have been presented. Flux consumption is also found to play a significant role in deciding the heat source model parameters. 相似文献
