Molybdenum disulfide, unlimited development of possible lubrication additives
Molybdenum diulfide has two elements in it, molybdenum (or molybdenum) and sulfur. The chemical formula is MoS2. This compound belongs in the group of transition metal dichalcogenides. It is silver-black in color and can be found in nature in the form molybdenite. Molybdenite, the most common molybdenum ore, is a powder. Molybdenum is found in molybdenite, which is a powdery substance that is insoluble and difficult to oxidize in dilute acids. The molybdenum is disulfide, which is similar to graphite on the surface. This is why it is commonly used as a solid grease because of its high durability and low coefficient.
Molybdenum diulfide (MoS2), one of the commonest natural minerals, is commonly used by people as a solid grease in their daily lives. MoS2's surface has a metallic sheen and a smooth, lustrous luster. It is also resistant to heat and humidity. MoS2 has a unique morphological characteristic. The transition metal sulfide is composed of 3 atomic layers. The covalent bond is strong between the atoms, but the layer connection is weak. The layers roll more easily when external pressure is applied to the friction process. Also, the molecular coating is more easily broken to create a slippery surface. The level of external force can be increased to a great extent when deformation and rolling occurs. MoS2 has potential as a wireless additive.
How to prepare molybdenum disulfide
Researching the preparation method of MoS2 will be the main problem in its application. MoS2 can only be applied well if it is prepared with excellent performance and good morphology. MoS2 can be prepared in many different ways. These include the hydration-heat method, chemical-vapor deposition method surfactant-promoting method, and physical mechanical method.
Chemical vapor deposition
Chemical vapor deposition is an easy method to use, with a high product purity, low cost and a large molybdenum-disulfide material that is of excellent quality. He Dawei et al. Under normal pressure, a chemical vapor deposition technique simplified for molybdenum was used to deposit a large single-crystal molybdenum on sapphire. The molybdenum monolayer was triangular with an average side length of 50 m.
The method may have many applications but there is a possibility of HS. It is therefore necessary to perform the appropriate disposal for the exhaust gas. The appearance of the product in this link is also based on the flow and the pressure of the gas phase. Due to the volatility, the forms of the dry-batch are also different. Therefore, it is important that the law continues to research and develop new approaches and fields.
Physical mechanical method
It is very easy to control the output of the physical and machine method. Deng Baihan et al. Raman spectroscopy is used to determine graphene layers. This was followed by data fitting and analysis. The MoS2 spherical structure, which contains the base oil, will provide a high-quality lubricating action. In the output link itself, repeatability is low and cannot be in line with the appeal of large scale output.
Hydration heat method
The nano-MoS2 has a small material specification and excellent wear resistance.
Sun Jiaojiao et other materials were used to prepare non-platinum, high-performance, low-cost hydrogen evolution electrocatalysts. The preparation of MoS2 was completed by using L-cysteine and ammonium molybdate trihydrate as raw materials.
The hydrothermal process has received unanimous praise from the users for its simple operation, high product purity, and green environmental protection. It has been a crucial part of the development and research of nano molybdenum.
The surfactant assisted method has a very high development potential. It is a stable process, with a dispersion which allows for fine control of the appearance. It is therefore possible to design the structure and shape of the MoS2-based nano material by choosing different types of Surfactants.
Bai Geling et al. utilised the PEG-20000 coating agent to prepare nano-MoS2, while Span-80 was used as a dispersant around 1% MoS2 microspheres and ultrafine diulfide. A systematic investigation of the performance of the molybdenum composite micron powder lubricating oil in rolling friction was conducted.