Preparation Of TiO2 Nanotubes Research Articles

Preparation of TiO2 Nanotube Using Anodization Method: Charactherization and Its Application for CO Sensor

Preparation of highly ordered TiO 2 nanotube arrays (HOTNAs) by anodization of Ti foil industrial grade in ethylene glycol electrolyte containing 0.3% of ammonium fluoride and 2% of water at 30 V for 90 minutes was conducted. The morphology structure, chemical composition, functional group, crystal phase, and optical properties of HOTNAs were characterized by field emission scanning electron microscope (FE-SEM), Energy Dispersive X-Ray (EDX),Fourier transform infra-red spectroscopy (FTIR), X-ray diffraction (XRD), and ultraviolet visible diffuse reflectance spectroscopy (UV/Vis-DRS). The well-ordered nanotube with vertically oriented structure was formed in the HOTNAs having size in diameter, length, and wall thickness of 48,0 nm, 1,8 µm, and 26,7 nm, respectively. The fabricated HOTNAs were evaluated for their sensing properties for CO detection. The results show that the fabricated HOTNAs were able to detect 2500 ppm of CO gas with response about 93,429 at operation temperature 150 ° C. This preliminary study of sensing performance demonstrates that the prepared HOTNAs under this study is potential and promising as a material sensor for CO detection.

Role of TiO2 Nanotubes on the Surface of Implants in Osseointegration in Animal Models: A Systematic Review and Meta-Analysis.

This systematic review and meta-analysis aims to synthesize evidence relating to the effects of TiO2 nanotubes on osseointegration in animal models. The focused question was "Does the preparation of TiO2 nanotubes on the surface of implants enhance osseointegration?" Searches were performed for relevant manuscripts up to September 2019 using the PubMed, Embase, Scopus and Google Scholar databases with terms such as "TiO2 nanotubes" in combination with "osseointegration", "osteogenic", "osteogenesis", and "bone regeneration". The titles, abstracts and full texts of the manuscripts were reviewed in accordance with the eligibility criteria. The meta-analysis were then performed to analyze the effects of TiO2 nanotubes in bone-implant contact (BIC) and biomechanical tests. Fourteen manuscripts were included for the systematic review and meta-analysis. Eleven studies showed that the results of a histological analysis, micro-CT evaluation and biomechanical tests were significantly higher near TiO2 than titanium. The meta-analysis demonstrating similar results in the BIC and biomechanical tests were obtained. The selected studies also showed the preferable nanotube diameter (70, 80, or 100 nm) to enhance osseointegration in BIC and/or bone area (BA). TiO2 nanotubes, especially those with large diameters, enhanced osseointegration near titanium implants. Compared to bare nanotubes, TiO2 nanotube composite coatings resulted in higher osteogenic ability.

Facile Synthesis of One-Dimensional Titania Nanotubes via Hydrothermal Method

Titanium dioxide (TiO2) nanoarchitecture has been widely used in the environmental and energy related applications. Herein, a simple and facile synthesis method will be introduced for high-conversion preparation of TiO2 nanotubes using hydrothermal method from nanoscale TiO2 particles. The quantity of TiO2 nanoparticles being used towards the formation of nanotubes was investigated using FESEM, TEM and EDX. In the present study, TiO2 nanoparticles were treated chemically with NaOH aqueous solution and subsequently with HCl aqueous solution under optimum experimental condition. It was found that the TiO2 nanotubes with outer diameter of 10 nm were successfully formed. In this case, the amount of residual Na+ ions during the hydrothermal synthesis stage can be controlled by HCl treatment, which resulted in the formation of one-dimensional TiO2 nanotubes.

Optimization of the Preparation Technology of TiO<sub>2</sub> Nanotubes

As for the low yield and high consumption of electrolyte in conventional anodization for TiO2nanotubes, several schemes were proposed to optimize the unit yield. The anode surface area per unit volume of electrolyte and the homogeneity of the electric field are found to affect the unit yield of well-structured TiO2nanotube besides voltage, F-and water content, reaction time and temperature, etc. Experimental results show that the unit yield over the cylindric electrodes quadruples in comparison with conventional anodization, which is attributed to higher anode surface area and homogeneous electric field. And SEM image indicates that well-structured TiO2nanotube arrays are fabricated. Thus it can be concluded that the unit yield could be increased by the method proposed in this paper and that our work provides a reference for the bulk preparation of TiO2nanotube and the energy-saving and emission-reduction in the process.

Doped TiO<sub>2</sub> Nanotubes: Synthesis and Application

TiO2 nanotubes have recently been studied extensively due to their high surface areas and finite length scales, allowing highly efficiency electron-hole charge separation and reduced recombination. Owing to these properties they can be used for instance in photocatalysis and lithium-ion batteries. The preparation of TiO2 nanotubes through hydrothermal process has received much attention. However, the practical application of TiO2 nanotubes is significantly hindered by their intrinsic energy band gap > 3 eV, which ensures that these materials cannot be excited by visible light. Visible-lightactivated TiO2 can be prepared by doping through incorporation or decoration with other metal ions, non-metal ions, and semiconductors. This review discusses various types of dopants, doping methods, and applications of doped TiO2 nanotubes. Keywords: Doped TiO2, nanotubes, visible-light adsorption, hydrothermal treatment, photocatalysis.

Self-rotating photocatalytic system for aqueous Cr(VI) reduction on TiO2 nanotube/Ti mesh substrate

In this study, a self-rotating photocatalytic system is applied to reduce toxic Cr(VI) to non-toxic Cr(III) in aqueous solution under UV irradiation. To overcome the limitation of powdery photocatalysis, a novel approach towards a photocatalytic system for aqueous Cr(VI) reduction including self-rotating TiO2 nanotubes on a Ti substrate (mesh type) was established.For the preparation of TiO2 nanotubes on the Ti substrate, Ti mesh (10cm×10cm) was anodized at 50V to 25°C for 25min with mixed electrolytes (NH4F–H2O–C2H6O2), and then annealed at 450°C for 2h in ambient oxygen at a flow rate of 400mLmin−1. The fabricated TiO2 nanotube arrays were uniformly grown on Ti mesh and surface characterizations was performed through the measurements of SEM, XRD, and zeta potential.The HRT (Hydraulic retention time) and rotating speeds were significantly affected by inlet flowrate in this reactor being decreased and increased, respectively, with increasing inlet flowrate. Hence, the efficiency of photocatalytic Cr(VI) reduction was observed to be highest up to 95% at the 90rpm. In addition, the rate of Cr(VI) reduction was increased by increasing the number of TiO2/Ti meshes.