Scalable, solution-phase syntheses of metal nanowires are enabling their increased use in electrochemical processes. This review highlights recent results demonstrating how metal nanowires can exhibit better durability and higher activity than traditional metal nanoparticle electrocatalysts on carbon supports. Metal nanowires can also form interconnected two-dimensional and three-dimensional (3D) networks that eliminate the need for a carbon support, thus eliminating the detrimental effects of carbon corrosion. Porous 3D networks of nanowires can be used as flow-through electrodes with the highest specific surface areas and mass transport coefficients obtained to date, enabling dramatic increases in the productivity of electrochemical reactions. Nanowire networks are also serving as 3D current collectors that improve the capacity of batteries. The tunable surface structure and dimensions of metal nanowires offer researchers a new opportunity to create electrodes that are tailored from the atomic scale to the microscale to improve electrochemical performance. 相似文献
We explore a connection between generalized uncertainty principle (GUP) and modified Ho?ava–Lifshitz (HL) gravity. The GUP density function may be replaced by the cutoff function for the renormalization group of modified Ho?ava–Lifshitz gravity. We find the GUP-corrected graviton propagators and compare these with tensor propagators in the HL gravity. Two are qualitatively similar, but the p5-term arisen from Cotton tensor is missed in the GUP-corrected graviton propagator. 相似文献
We study the propagation of a scalar, the trace of hij in the deformed Ho?ava–Lifshitz gravity with coupling constant λ. It turns out that this scalar is not a propagating mode in the Minkowski spacetime background. In this work, we do not choose a gauge-fixing to identify the physical degrees of freedom and instead, make it possible by substituting the constraints into the quadratic Lagrangian. 相似文献
For the determination of 210Po in water samples, two alternative procedures (a) DDTC solvent extraction and (b) extraction chromatography using Sr Resin
were selected and then validated in terms of trueness, repeatability and reproducibility with a tap water spiked with a known
amount of 210Po. In this work the optimization conditions for the auto-deposition of Po for source preparation were also studied. 相似文献
Visible improvements : Owing to the plasmon resonance of silver nanoparticles deposited on the surface of AgBr, the newly‐prepared plasmonic photocatalyst Ag§AgBr has a strong absorption in the visible region (see picture) and shows high efficiency in the photodegradation of organic pollutants under visible light.
A simple, rapid, and reproducible isocratic reversed-phase LC method has been established for simultaneous analysis of mirodenafil and its two main metabolites, SK3541 and SK3544, in rat plasma, urine, and tissue homogenates. Samples were deproteinized with acetonitrile containing sildenafil (internal standard). The compounds were separated on a C18 column with 52:48 (v/v) 0.02 m ammonium acetate buffer (pH 6)—acetonitrile as mobile phase at a flow rate of 1.4 mL min?1. UV detection was at 254 nm and detection limits of mirodenafil, SK3541, and SK3544 in plasma were 0.03, 0.05, and 0.1 μg mL?1, respectively. The method is applicable to pharmacokinetic studies of mirodenafil and its metabolites in rats. 相似文献
In tandem mass spectra of phosphopeptides, intact sequence ions are often missing or appear weakly. Instead, dephosphorylated sequence ions appear prominently. In this work, we used photodissociation (PD) multi-stage (MSn) time-of-flight mass spectrometry that can monitor reaction intermediates with lifetime as short as 100 ns to study the formation of dephosphorylated sequence ions such as yn-H3PO4. yn-H3PO4 was found to be formed mainly by H3PO4 loss from yn. For doubly phosphorylated peptides, yn seemed to lose H3PO4 stepwise and form yn-H3PO4 and yn-2H3PO4. Even when yn was absent in PD-MS2 spectrum, its m/z could be predicted from those of yn-H3PO4 and/or yn-2H3PO4. Complete sequence coverage was possible when the data from PD-MS2 and PD-MS3 were combined, demonstrating the utility of transient ion detection by PD-MS3 for structure analysis. 相似文献