Application of TiO2 Nanoparticles in Clay Roofing Tiles as a Photocatalytic Active Material

A novel roofing tile was developed containing various types of nanoparticles of titanium dioxide (TiO2). Experiments were conducted using three types of TiO2 nanoparticles with and without polyethylene glycol (PEG). All types of newly developed nanomaterials were characterized using X-ray diffractometry. Particle size distribution analysis was performed and specific surface area was determined using the Brunauer–Emmet–Teller method. SEM imaging was used for the morphological characterization of nanoparticles. Commercial ceramic roofing tiles underwent a dip-coating procedure to obtain the desired photocatalytic surface. The TiO2 anatase samples exhibited greater surface areas of nanoparticles, thus providing potentially the highest photocatalytic efficiency.

Highly efficient biphasic calcium-phosphate coating procedure with an enhanced coating yield and protein incorporation rate

A biphasic calcium-phosphate (CaP)-coating is a promising surface modification for functionalizing various endosseous biomaterials. However, its biomedical application is limited by its low coating yield and incorporation inefficiency. We developed a highly concentrated (4.5×) supersaturated calcium-phosphate solution (SCPS) and compared its physicochemical properties with those of 1× SCPS. One milliliter of 4.5× SCPS formed a thick (110 μm) continuous coating on a titanium disc (4×4×1 mm), compared to the thin (29 μm) 1× SCPScoating. On X-ray diffraction analysis, the 4.5× SCPS-coating had characteristic dicalcium-phosphate dehydrate and apatite peaks, in contrast to the apatite-only of 1× SCPS-coating. Under acidic condition (pH 4.5), the 4. × 5SCPS-coating released significantly less Ca2+ than the 1× SCPS-coating. FITC-bovine serum albumin incorporation in the 4.5× SCPS-coating (81.20±6.42%) was significantly higher than in the 1× SCPS-coating (21.86±1.90%). Thus, this modified coating procedure holds promise for biomedical applications.

A REVIEW OF LAST DEVELOPMENTS IN THIN FILMS PARAMETERS OF DIRECT CURRENT SPUTTERING FOR OPTICAL AND BIOMEDICAL APPLICATIONS

Nano thin films and nano coating have been applied in different fields in health care system because of their higher antiviral properties. Additionally, as the world have suffered since December 2019 from Covid-19 situation, different scientists and industrials people have tried to apply nano antiviral films and coatings in our daily life. In this short review, nano thin film coating procedure by DC sputtering technique has been reviewed, investigated, and evaluated by using different materials and device parameters in recent years. This report focuses on device factors that affect the thickness of nano-thin films for optical and optic-electric applications. These parameters including time, temperature, power, pressure, and flow rate of gases. The review provides more understanding meaning of the coating procedure by DC sputtering process.

Decomposition of Energetic Ionic Liquid Over IrCu/Honeycomb Catalysts

The objective of this study is to elucidate the influence of a loading procedure of iridium and copper oxides over cordierite honeycomb support on catalytic performance during the decomposition of a hydroxylammonium nitrate (HAN) solution. Iridium and copper composite oxides were successfully supported on the cordierite honeycomb at the same time by repeating the wash coating process more than 2 times. Through the wash coating process, Cu and Ir were supported up to 43.4% and 4.9%, respectively. The cordierite honeycomb without active metal plays little role as a catalyst to lower the decomposition temperature. It was found that IrCu/honeycomb-2 catalyst, which was prepared by repeating the wash coating procedure twice, is an optimal catalyst for the decomposition of HAN solution. The IrCu/honeycomb-2 catalyst had the effect of lowering the decomposition onset temperature by 27.1°C compared to thermal decomposition.

Enhancing iCVD Modification of Electrospun Membranes for Membrane Distillation Using a 3D Printed Scaffold

Electrospun membranes have shown promise for use in membrane distillation (MD) as they exhibit exceptionally low vapor transport. Their high porosity coupled with the occasional large pore can make them prone to wetting. In this work, initiated chemical vapor deposition (iCVD) is used to modify for electrospun membranes with increased hydrophobicity of the fiber network. To demonstrate conformal coating, we demonstrate the approach on intrinsically hydrophilic electrospun fibers and render the fibers suitable for MD. We enable conformal coating using a unique coating procedure, which provides convective flow of deposited polymers during iCVD. This is made possible by using a 3D printed scaffold, which changed the orientation of the membrane during the coating process. The new coating orientation allows both sides as well as the interior of the membrane to be coated simultaneously and reduced the coating time by a factor of 10 compared to conventional CVD approaches. MD testing confirmed the hydrophobicity of the material as 100% salt rejections were obtained.

Effect of Temperature on Mo–C Blend Composite Coating for Piston Ring Applications

The Mo–C blend composite coating was effectively developed with good surface morphology and enriched tribological properties using APS coating procedure for piston ring applications. The surface roughness values of composite coating maximum at 450 °C. The experimental result of Mo–C based coating shows that as the temperature varies from 30 to 450 °, COF decreases from 0.6 to 0.3, while specific wear rate was increased from 0.2 to 0.5 mm3/Nm. The increase in specific wear rate and decrease in COF may be attribute due to tribofilm formation on Mo blend composite coating.

Obtaining and Characterizing Thin Layers of Magnesium Doped Hydroxyapatite by Dip Coating Procedure

A simple dip coating procedure was used to prepare the magnesium doped hydroxyapatite coatings. An adapted co-precipitation method was used in order to obtain a Ca25−xMgx(PO4)6(OH)2, 25MgHAp (xMg = 0.25) suspension for preparing the coatings. The stabilities of 25MgHAp suspensions were evaluated using ultrasound measurements, zeta potential (ZP), and dynamic light scattering (DLS). Using transmission electron microscopy (TEM) and scanning electron microscopy (SEM) information at nanometric resolution regarding the shape and distribution of the 25MgHAp particles in suspension was obtained. The surfaces of obtained layers were evaluated using SEM and atomic force microscopy (AFM) analysis. The antimicrobial evaluation of 25MgHAp suspensions and coatings on various bacterial strains and fungus were realized. The present study presents important results regarding the physico-chemical and antimicrobial studies of the magnesium doped hydroxyapatite suspensions, as well as the coatings. The studies have shown that magnesium doped hydroxyapatite suspensions prepared with xMg = 0.25 presented a good stability and relevant antimicrobial properties. The coatings made using 25MgHAp suspension were homogeneous and showed remarkable antimicrobial properties. Also, it was observed that the layer realized has antimicrobial properties very close to those of the suspension. Both samples of the 25MgHAp suspensions and coatings have very good biocompatible properties.