Drilling Pressure Gauge
The drilling pressure gauge can accurately
reflect the additional pressure from the driller weight and the bottom pressure
at the time of pressure relief drilling during the drilling operation. It
provides reliable base for acquiring reasonable drilling speed. It is suitable
for use by drilling machines in the geological, metallurgy, oil, chemical and
coal industry.
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This research highlights the use of graphene as a medium to enable substrate surfaces that appear to be incapable of being used for carbon nanotube growth. Diamond is just a good example.
Diamond has a good thermal conductivity of 5 times better than copper; however, its available effective surface area is low. Because of its characteristics, an atomic thickness of graphene is all its surface area. The structure of the carbon nanotubes is similar to that of the carbon nanotubes. Similar to traditional heat transfer, vertically aligned carbon nanotube clusters grown on the diamond surface also dissipate heat and have millions of heat sinks. Such an ultra-thin arrangement can greatly save space for small microprocessor devices.
Researcher Ajayan said that around this topic, future work may also study the arrangement of imitation nanotubes grown on diamond surfaces for use in electronic devices. Graphene and metal nanotubes also have good conductivity; if combined with metal substrates, they will be used in advanced electronic devices.
To test this idea, Honda's research team used chemical vapor deposition to generate a variety of graphene on copper foil, and then moved these tiny graphene sheets onto diamond, quartz and other metal materials for further study.
As a result, it was found that only a single layer of graphene has good properties, particularly corrugated and pleated properties. It has also been found that graphene is easily attached to the iron-based catalyst particles. The researchers believe that graphene contributes to the formation of nanotubes by preventing clustering of catalyst particles.
Ajayan believes that the ultra-thin properties of graphene remain to be discussed. In previous studies, Rice Labs found that graphene-coated materials are susceptible to moisture, while graphene protects them from oxidation. This may be a highlight in graphene research, Ajayan said, by which a non-invasive coating can be applied to the surface of the substrate to protect the substrate material. In the test, graphene maintained the activity of the catalyst well but prevented its clustering.
The test also found that the graphene single carbon layer maintains its integrity between the nanotubes and the diamond or other substrate. On the surface of a metal substrate such as copper foil, the entire mixture has high conductivity.
This seamless integration through the graphene interface provides low contact resistance for active components in current collectors and electrochemical cells, an important step in the development of efficient energy devices. (Compiled from Materials and Design; Translation: Wang Xian)
Study on Graphene-Based Diamond and Nanotubes
Abstract The ultimate heat sink with superior performance will be possible, all of which will benefit from graphene. Graphene, a carbon material with only one atomic thickness, acts as a medium to allow vertically aligned carbon nanotubes to grow on any surface. &n
The ultimate heat sink with superior performance will be possible, all thanks to graphene. Graphene, a carbon material with only one atomic thickness, acts as a medium to allow vertically aligned carbon nanotubes to grow on any surface.