In this research controlled coating of magnetite (Fe3O4) nanoparticles with SiO2 was investigated. The Fe3O4 nanoparticles were synthesized via chemical co-precipitation and then coated by silica according to Stober method. Effects of tetra ethyl ortho silicate (TEOS) concentration and ethanol to TEOS on the coating thickness were inves...

silica coating, with other silica phases for comparison. b) Transmission IR spectra of coating wafers, to determine water content. SILICA COATINGS ON THE 1974 KILAUEA FLOW: NEW SEM AND SIMS RESULTS AND IMPLICATIONS FOR MARS. S. M. Chemtob 1 , G. R. Rossman 1 , J. M. Eiler 1 , and B. L. Jolliff 2 . 1 California Institute of Technology, Pasadena, CA, 91125. ([email protected]) 2 Washington ...

A two-dimensional (2D) subwavelength nanostructure for antireflection coating is fabricated upon a transparent substrate. Self-assembled 2D colloidal crystals are used as a nanoscale composite material with controlled thickness and low refractive index. The feature size of the structure is approximately 105 nm. The structure is used for antireflection coating, and the measured reflectivity of a...

The Fe3O4/CeO2 magnetic photocatalyst was prepared by coating directly onto the surface of magnetic Fe3O4 particles. However a direct contact of CeO2 onto the surface of magnetic Fe3O4 particles presented unfavorable heterojunction, thus the SiO2 barrier layer between magnetic Fe3O4 and CeO2 was prepared as a core-shell stucture to reduce the negative effect by combining three steps of the hydr...

Industrial upscaling frequently results in a different coating microstructure than the laboratory prototypes presented literature. Here, we investigate wear behavior of physical vapor deposited (PVD) MoS2 coatings: A dense, nanocrystalline coating, and porous, prismatic-textured coating. Transmission electron microscopy (TEM) investigations before after testing evidence crystallographic reorien...

The surface characteristics of hydrous silica-coated TiO particles are experimentally studied. Different analytical techniques were 2 Ž . used to characterize the Si oxide coatings on TiO particles. The high-resolution transmission electron microscope HRTEM , z-potential 2 Ž . analyzer and X-ray photoelectron spectroscope XPS analyses show that hydrous silica is continuously coated on the surfa...

Novel multilayer structured TiBN coatings were deposited on Si (100) substrate using TiBN complex cathode plasma immersion ion implantation and deposition technique (PIIID). The coatings were characterized by X-ray diffraction (XRD), high-resolution transmission electron microcopy (HRTEM), energy-dispersive spectrometer (EDS) and ball-on-disk test. XRD results reveal that both samples of TiBN c...

in this research, b4c-ni cermet coating was sprayed on the surface of 4130 steel from b4c and ni feed-stockpowders using high velocity oxy-fuel (hvof) method. in order to characterize the tribological behavior of thecoating, ball on disk wear tests were done at the ambient temperature and under the loads of 1, 3 and 5 n.phase analysis of the coating after spraying was studied by x-ray diffracto...

Planar waveguides of SiO2:TiO2 (multilayer structure) and SiO2:CeO2 (thick layer) were prepared onto commercial glass substrates using a sol-gel technique combined with dip-coating. These glassy coatings were structural characterised by Transmission Electron Microscopy (TEM) Energy Dispersive X-ray analysis and by Confocal Microscopy. Thicknesses of 1230 nm and 4,15 μm and refractive indices of...