The influence of specific lubricants on the friction and wear properties of titanium aluminum nitride + solid carbon two-layer coating investigation

The influence of three model lubricants (inactive, surface-active and chemically active) on the friction-wear characteristics of steel—steel friction pairs, steel—coating of titanium aluminum nitride and steel—two-layer coating of titanium aluminum nitride + hard carbon coating is studied. The minimum coeffi cient of friction and the minimum diameters of the wear spot were established for the combination of steel-two-layer coating of titanium aluminum nitride + hard carbon coat ing-orientant in compared media.

MOF-derived Bi2O3@C microrods as negative electrodes for advanced asymmetric supercapacitors

Bi2O3 microrods with a carbon coat (Bi2O3@C) exhibit ultrahigh specific capacity (1378 C g−1 at 0.5 A g−1) and excellent cycling stability (93% retention at 4000 cycles) as negative electrodes for supercapacitors.

A Mathematical Model for Determining Carbon Coating Thickness and Its Application in Electron Probe Microanalysis

In electron probe microanalysis where materials are coated with a thin conductive carbon coat before analysis, the X-ray intensity detected from a specimen may be affected to various degrees by the thickness of the carbon coating. Differences in the carbon film thickness between specimens and standards may lead to errors in analytical results, particular for lower energy X-rays. In this study, we demonstrate that the location and the distance of the specimen relative to the carbon tip in the coating chamber can affect the thickness of the carbon film produced on the specimen surface during carbon coating. The closer the specimen is to the carbon tip contacting point, the thicker is the carbon film deposited. A mathematical model to calculate the carbon film thickness at different locations on the coater plate is established, based on the assumption that carbon atoms evaporate from the carbon tip equally in all directions during the coating process. In order to reduce the differences in the carbon coating thickness, we suggest moving the carbon rod to a higher position, moving the thinner samples to the center and thicker samples to the edge of the coater plate, and using a rotating circular coater plate during coating.

AN EASY METHOD TO SYNTHESIZE CARBON-COATED QUANTUM DOTS

This manuscript describes a general and simple method to carbon-coat quantum dots (QDs) using microwave-assisted technology. By coating QDs with carbohydrates, you extend their application for bioimaging (in vitro and in vivo) as the metal core is now shielded by a protective coating layer. XRD and TEM verified that nanoparticles were coated with a layer of carbon-based material (reduced sucrose). In addition, we demonstrated the versatility of this approach by coating other types of nanoparticles (i.e. gold). UV–Visible spectroscopic analysis presented a red shift in absorbance after carbon coating which further confirmed that the surface of these nanoparticles was modified. QDs emission wavelength was not altered but experienced an increase in intensity. The carbon-coated QDs and gold nanoparticles generated in this study measured 14 nm and 60 nm, respectively.