MoS2 Rectifier Can Convert Wi-Fi Signals into Electrical Energy

An ultra-thin two-dimensional device that can convert alternating electromagnetic waves such as Wi-Fi signals propagating in the air into electrical energy was reported to be developed by engineers at the Massachusetts Institute of Technology (MIT). The device can effectively improve the flexibility of existing rectenna system and expand the size of terminal equipment. 

You may be curious about the device. Actually, it is a rectifier made up of molybdenum disulfide (MoS2). The antenna is a kind of energy conversion device and transmitting antenna converts the guided wave into a space radiated wave, and the receiving antenna converts the space radiated wave into a guided wave. It is widely used in engineering systems such as radio communication, broadcasting, television, radar, navigation, electronic countermeasures, remote sensing, radio astronomy, etc. Although it brings certain convenience to the society, the scope of application is still quite limited.

In order to further enhance the flexibility and scalability of the rectenna system, MIT researchers used molybdenum disulfide components to construct a new type of rectifier, which can better convert electromagnetic waves into electric current. According to the researchers, the MoS2 rectifier can capture and convert wireless signals up to 10GHz with an energy efficiency of about 30%-more flexible and faster than other designs. Of course, there are other technologies that can achieve nearly 60% efficiency.

However, the power generated by the MoS2 solution is relatively small, but it is still very suitable for use in small wearable or medical electronic devices, eliminating the need for batteries. Relevant research results have been published in the recently published "Nature" journal. The original title is: "Two-dimensional MoS2-enabled flexible rectenna for Wi-Fi-band wireless energy harvesting".

The two-dimensional MoS2-enabled flexible rectenna is a low-dimensional wide band gap semiconductor material, and the thickness of the layer is only equivalent to three atoms, which has excellent electrochemical performance and semiconductor effect. 

At present, there are many methods for preparing MoS2, such as ammonium tetrathiomolybdate thermal decomposition method, hydrogen sulfide or sulfur vapor reduction method, high-energy ball milling method, carbon nanotube space confinement method, hydrothermal synthesis method, high-energy physical means and chemistry law combination and so on.

If you have any inquiry of MoS2 powder, please feel free to contact us:
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How do Impurities of Glass Material Affect Service Life of Molybdenum Electrode?

Among the types of cups and pots on the market, glass is the healthiest, safest, and most widely used cups, according to relevant research data. There are various kinds of glasses in the market, but only those with pure glass material, crystal clear body, and moist feel are deeply loved by consumers. How to produce high-quality glass? 

The production process of glass is batching, melting, forming, sintering and annealing. Among them, melting is extremely important for the quantity of finished products and is the top priority in the process. The prepared raw materials are heated in a glass furnace at a high temperature to form a uniform and bubble-free glass liquid. This is a very complicated physical and chemical reaction process, and the quality control of the electrodes used as electric heating should be very strict for each glass factory. 

The glass melting electrode must be able to withstand corrosive glass melting and strong high temperature. Bubbles are not permitted in the process of contact with molten glass, and the product of corrosion of electrode material must not bring any defect to finished glass. Now pure molybdenum material is proved to be the most suitable material for these challenging conditions, considering its characteristics of excellent creep resistance, outstanding corrosion resistance, high purity and good thermal and electrical conductivity.

However, the glass melting process is usually accompanied by various problems.

Glass hybrid materials usually contain chemical impurities, such as As2O3, Sb2O3 and sulfur. If they react with cerium oxide, they will make the glass yellow. If the iron, chromium and other elements in the raw materials exceed the standard, the glass will turn green or yellow, which will waste a lot of decolorizing agent. In the glass furnace, over chemical impurities will have a serious impact on normal operation of the electrode.

Nitric acid water is a liquid mixture mainly composed of sodium sulfate and sodium fluoride. The presence of a large amount of sodium ions makes it highly conductive and always floats on the viscous layer of liquid glass. At the junction of recycling cooling water and electrode jacket, the electrode is short but with high current density. If the nitric acid water reacts with the electrode, the molybdenum electrode will be far unable to carry the current density and then break.

The purity of the molybdenum electrode is very important, which requires at least 99.95% and the content of impurities needs to be controlled under a certain value to prevent the purity problem from affecting the service life. At the same time, the quality of glass material also needs to be guaranteed. Nitric acid water seems trivial, but it can destroy countless electrodes.

If you have any inquiry of molybdenum electrode, please feel free to contact us:
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Molybdenum Alloy Plugs to Pierce Stainless Steel Pipes

There are two kinds of steel pipes – stainless steel pipes and welded steel pipes, according to their production methods. Compared with welded steel pipes and other steels, stainless steel pipes are pierced with tools such as plugs and mandrels.

These piercing tools not only participate deformation, but also are the most important factors that determine whether the main processers of steel pipe production, such as piercing and pipe rolling can operate normally. As a matter of fact, the production process of seamless steel pipe also reflects the technical level of these tools. In other words, the research on internal deformation tools is an important subject of seamless steel pipe technology research.

Molybdenum alloy plugs are used to pierce seamless tubes of different materials, such as stainless steel, brazing steel, high-temperature alloy steel and other special parts. As they work in high temperature and harsh environments, the material of plug requires the characteristics of high temperature strength, high temperature oxidation resistance, long service life, corrosion resistance and not easy to stain glass.

Therefore, the material of the plug usually adopts molybdenum alloy with a composition of Ti, Zr, C and Mo. Molybdenum alloy plug is produced in a powder metallurgy process, has a higher recrystallisation temperature and higher strength compared to pure molybdenum, and is readily deformable even at room temperature. These effects are due to mixed crystal formation between Mo and Ti as well as the precipitation of ZrC as a dispersoid.

Actually, the materials to be used depends on what kinds of steel pipes to be pierced. Different materials of pipes have different characteristics and thus require plugs to meet different working conditions. As a professional manufacturer of molybdenum and tungsten, Chinatungsten Online can offer you various kinds of piercing plug. Certainly, customized designs are welcomed. Send us drawings and inform us its detailed application, we will offer you the best solution. 

If you have any inquiry of molybdenum alloy plugs, please feel free to contact us:
Email: sales@chinatungsten.com/sales@xiamentungsten.com
Tel.: +86 592 5129696/+86 592 5129595

Fax: +86 592 5129797

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