| 词汇 | 氧化物 |
| 释义 | 氧化物 A2005 study in Environmental Science & Technology showed that zinc oxide nanoparticles were toxic to human lung cells in lab tests even at low concentrations. There was another example, and that was the famous case of the alleged contract between Iraq and Niger for the import of yellowcake, uranium oxide. The solution is then treated to precipitate uranium oxide. The technique is precise, which means that the rest of the graphene oxide sample remains insulating. An extra benefit of the solid- oxide technology is that any CO2 produced emerges from the cell mixed only with water vapour. The nuclear fuel is uranium oxide. The uranium is then dissolved from the beads using a solution of ammonium carbonate and precipitated as “ yellow cake”, a mixture of uranium oxides. Measured like that, each oxide forms about10% of standard basalt. Sulfur oxides. At the moment oxides of metals such as zinc and copper seem to be the favourites, but tiny tubes made of carbon are also being explored. For the cathode, Planar uses lithium manganese dioxide; for the anode, doped tin oxides and lithium alloys. It does this because heating cerium oxide drives oxygen atoms out of its crystal lattice. The batteries commonly used in today's mobile phones and laptops still use cobalt oxide as the positive electrode. And he predicts the density of the oxide of the yet undiscovered element. They designed an electrode made from porous carbon and lithium oxide. And now, allegedly, China has refused to export rare earth oxides, rare earth salts, and pure rare earth metals. The new material is a significant improvement over lithium cobalt oxide. The actual chemical make-up of rocks is complex, so the conventions of petrological analysis pretend that these metals are present in basalt as their oxides. However, replacing the old metal oxides with electrochemically related materials results in a stable but not very efficient battery, unable to store large amount of energy. The metal oxide semiconductor field effect transistor MOSFET works on a similar principle, but the diode is buried within the MOSFET. In an iron thermite reaction, iron oxide reacts with aluminum and comes out as liquid iron. In the week of the Asilomar meeting Science published evidence that more pollutants than previously appreciated, including oxides of sulphur, are getting into the lower stratosphere. That is why aluminum is so expensive because the oxide is so stable. The halted shipments involved rare earth oxides, rare earth salts and pure rare earth metals— all of which are carefully tracked by customs officials for compliance with government export quotas. Until now, the quotas mostly covered alloys and oxides with a rare earth content of at least50 percent. There were just two problems: it had a lower energy-density than cobalt oxide and suffered from low conductivity, limiting the rate at which energy could be delivered and stored by the battery. Cronin and his team begin by creating salts from negatively charged ions of the large metal oxides bound to a small positively charged ion such as hydrogen or sodium. One of them combines lithium manganese oxide with other ions, and operates at about three to five volts with a charge capacity of200 milliamp hours per gram. During the psuedogap phase, electrons undergo a change in copper- oxide semiconductors in which the tunneling ability of electrons is different in different oxygen atoms. |
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