Papers by Keyword: Titanium Oxide

Abstract: This paper presents the results of study of the surface morphology of thin (~ 200 nm) biocompatible coatings based on titanium oxide and oxynitride deposited by reactive magnetron sputtering for vascular stents made from stainless steel. The analysis of the roughness of the coating surface was performed for describe qualitatively their topography.

Abstract: The article compares the corrosion properties of oxide layers formed on titanium nitride (obtained in glow-discharge nitriding) using electrolytic plasma oxidation. The corrosion properties are analysed in correlation with the surface morphology, microstructure and chemical composition of the layers. The oxidation processes were carried out in 10% and 25% phosphoric acid (V) solutions containing Ca²⁺ calcium ions. In each of these environments, oxide layers were formed using three oxidation potentials: 200V, 400V and 600 V. The oxidation potential and the concentration of acid and calcium ions in the oxidation solution was shown to affect the morphology of the surface and the corrosion properties of the oxide layers obtained.

Abstract: The corrosion resistance of oxide layers produced on titanium nitride (obtained in glow-discharge nitriding) by means of electrolytic oxidation at different potentials and durations is presented in the paper. The oxidation processes were carried out in phosphoric acid (V) (25wt.%) containing Ca²⁺ calcium ions. Two plasma oxidation potentials of 40 V and 100 V were applied. Treatment was carried out at two different process durations, i.e. 30 minutes and 120 minutes. The impact of oxidation potential and process time on the morphology of the surface and corrosion properties of the oxide layers obtained was examined.

Abstract: The article compares the corrosion properties of oxide layers formed on titanium nitride (obtained by means of glow-discharge nitriding) using anodic and plasma oxidation. The corrosion properties are analysed in relation to the surface morphology and microstructure of the layers. The oxidation processes were carried out in phosphoric acid (V) (25wt%) containing Ca²⁺ calcium ions. In this environment, oxide layers were produced using two anode oxidation potentials: 5 V and 9.5 V and two plasma oxidation potentials of 200 V and 600 V. The layers were then subjected to alkaline treatment in concentrated NaOH. The concentration of acid and calcium ions contained in the oxidation solution affected the surface morphology and corrosion properties of the oxide layers obtained after alkaline treatment.

Abstract: The results of study of surface morphology and chemical composition of biocompatible titanium oxide and oxynitride coatings deposited by the method of reactive magnetron sputtering are presented in this paper. The distribution of coating’s fragments in size was obtained. Molecular composition of the coatings was obtained by scanning electron microscopy and Raman scattering.

Abstract: TiO₂ hollow sphere was synthesized by hydrothermal method using Trifluoroacetic acid (TFA) and Ti (SO₄)₂ as raw materials. The photocatalytic properties of TiO₂ hollow sphere were evaluated by the photocatalytic oxidization of elemental mercury (Hg⁰) in simulated flue gas. The as-prepared samples were well characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-visible diffuse reflectance spectroscopy and nitrogen sorption/desorption. The results show that only anatase phase for TiO₂ the hollow sphere is obtained. The average diameter is about 800nm and the shell thickness was about 200nm. The sample prepared with TFA has better photocatalytic properties than P25.

Abstract: Alumina microfiltration membrane was prepared with solid particle sintering method by changing the content of TiO2. The membrane flux, rejection to PEG10000 and rupture strength were tested. The results showed that: when the firing temperature is 1400°C, PVA is 2%, TiO2 is 1%, alumina microfiltration membrane flux reached 1.93m3/m2·h, PEG10000 retention rate is 13.5%, and the flexural strength is 74.38MPa.

Abstract: The needs to improve the efficiency of coolants undeniably become one of the concerns in cooling systems technologies nowadays. Nanofluid as coolant is invented and studied where it can provide better option for users due to augmentation in properties. This study provides experimental investigation on Titanium Oxide dispersed in water and ethylene glycol mixture under transition region with Reynolds number range of 2000 < Re <10000. Three volume concentrations are used which are 0.5 %, 1.0 % and 1.5 % for heat transfer experimental investigation under working temperature of 30 °C at constant heat flux of 600 W. The Nusselt number of the nanofluid increase with the increasing of Reynolds number at 1.5 % concentration, slightly higher than based fluid. The finding on the heat transfer coefficient shows enhancement of 2.1 % achieved by Titanium Oxide nanofluid at 1.5 % volume concentration. For 0.5 % and 1.0 % concentration, no enhancement of heat transfer achieved for the fluid flow under transition region at temperature of 30 °C.

Abstract: Titania nanomaterial flower structure is synthesized through the ionothermal route and is used for the degradation of sulfan blue (SB) through the photo catalysis process. The ionic liquid used is 1-butyl-3-methypyridium dicyanamide ([Bmpm]DCN). The particle sizes and surface morphologies are characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Brunauer–Emmett–Teller (BET). Three types of titania have been compared for their degradation performance, namely commercial titania (TP), titania nanotube (TN), and titania flower (TF). The size of the particle is found to be approximately 33 nm from the FE–SEM analysis. The BET measures the highest surface area of 220 m² g^-1 and pore volume of 0.15 cm³ g^-1 for the TF. The degradation of binary dye is more favorable in alkaline solution with pH 14 while varying the dosage of the commercial TiO₂ from 0.025–0.2 g reveals an increase in the rate of degradation with optimum dosage is found to be 0.2 g. Results show that TF degradation rate is higher as compared to TP and TN.

Abstract: This research has investigated the physical performances of low-silver Sn-Ag-Cu (SAC) lead-free composite solder reinforced with titanium dioxide (TiO₂). The SAC/TiO₂ composite solder were fabricated via powder metallurgy (PM) technique. The five different composition chosen were 0, 0.25, 0.5, 0.75, and 1.0. The results showed that distribution of TiO₂ along the grain boundaries has increased the hardness of the SAC/TiO₂ composite solders compared to monolithic SAC solder alloy.