A hybrid electrochemical energy storage device was fabricated in aqueous NaOH with the 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) nitroxide radical as the active material, hydroquinone as the counter electrode active material, and an OH -selective separating membrane. The working principle of this device was investigated and it can be considered as a supercapacitor-battery hybrid energy storage system. Device performance was characterized by cyclic voltammetry and galvanostatic charge-discharge testing. When using multi-walled carbon nanotubes (MWCNTs) as electrode support materials, a high pseudo-capacitance of 1280 F g -1 was obtained with the TEMPO nitroxide radical as the active material at a 1 mV s -1 scan rate. This was ~33 times larger than the inherent double layer capacitance of MWCNTs. The electrode material and active material dissolved in solution could potentially be substituted with similar materials. This simple design provides a new approach for fabricating high performance supercapacitor-battery hybrid energy storage devices.
An in situ method has been used to load Cu_(2)O nanoparticles on the surface of a hydroxyl group rich TiO_(2)precursor.Cu_(2)O nanoparticles are formed by in situ reduction of Cu(OH)_(2) with Sn^(2+)ions linked to the surface of the TiO_(2)precursor.The initial Cu_(2)O nanoparticles serve as seeds for subsequent particle growth.The resulting Cu_(2)O nanoparticles are evenly dispersed on the surface of the TiO_(2)precursor,and are heat and air stable.The as-prepared composite is an excellent catalyst for Ullmann type cross coupling reactions of aryl halides with phenol.The composite catalyst also showed good stability,remaining highly active after five consecutive runs.
＜正＞This talk will focus on our recent work on single-molecule study of signaling protein in living cell membra...
Xiaohong Fang Beijing National Laboratory for Molecular Sciences,Key Laboratory of Molecular Nanostructures and Nanotechnology,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190
It is necessary to modify the running-in process for the application of ceramics using water as a lubricant in real conditions because ceramics sliding in water are characterized by a running-in period with severe friction and wear.Fullerenol,a kind of highly water-soluble nanoparticle,was synthesized and then used to ameliorate the tribological properties of Si 3 N 4 sliding against Al 2 O 3 in pure water.With the addition of fullerenol,the running-in period was shortened from 30 min to 100 s at a speed of 250 mm/s.The speed threshold above which ultralow friction can be obtained in a short time was expanded from 450 mm/s to 80 mm/s.Meanwhile,the load-carrying ability of water film was increased.The role of fullerenol was discussed based on observation of the wear scar by an optical interferometer and XPS characterization of the tribo-film on the wear track.
LIU YuHongWANG XiaoKangLIU PengXiaoZHENG JunPengSHU ChunYingPAN GuoShunLUO JianBin
Fluorescence imaging of single molecules is becoming a powerful tool to examine biological processes at the molecular level.Using total internal reflection fluorescence microscopy (TIRFM),it has been possible to study the dynamic behavior of single molecules on living cell membranes.Herein,we briefly review the application of TIRFM-based single-molecule imaging in studies of membrane receptors involved in signal transduction.Furthermore,we discuss several examples of our own research on growth factor receptors,including TGF-β receptors,HER2,and EGFR,and speculate possible applications of this technique to investigate other cellular events occurring on or near the plasma-membrane.
