Mixed-phase TiO2 nanocomposite thin films consisting of anatase and rutile prepared on commercially pure Ti sheets via the electrochemical anodization and annealing treatments were investigated in terms of their photocatalytic activity for antibacterial use around dental implants. The resulting films were characterized by scanning electron microscopy (SEM), and X-ray diffraction (XRD). The topo...

Nanoscale titanium dioxide is an important physical sun-block material and is widely used in sunscreen. In our test, the influences of the particle size and crystal structure on light absorbance were examined. The experiment shows that the absorbance (Abs) of nanoscale titanium dioxide in UV-ray district is much higher than it in visible light district under the same concentration (0.04 g/L). T...

Ultrafine titanium dioxide (TiO(2)) particles have been shown to exhibit strong cytotoxicity when exposed to UVA radiation, but are regarded as a biocompatible material in the absence of photoactivation. In contrast to this concept, the present results indicate that anatase-sized (10 and 20 nm) TiO(2) particles in the absence of photoactivation induced oxidative DNA damage, lipid peroxidation, ...

With ethanol as a probe molecule, the surface sites of anatase and rutile can be distinguished using (13)C CP/MAS NMR spectroscopy, which offers an opportunity to investigate the transfer of photo-induced electrons from rutile to anatase in the mixed-phase TiO2.

Co-doped TiO2 nanoparticles containing 0.0085, 0.017, 0.0255, 0.034, and 0.085 mol % Co(III) ion dopant were synthesized via sol-gel and dip-coating techniques. The effects of metal ion doping on the transformation of anatase to the rutile phase have been investigated. Several analytical tools, such as X-ray diffraction (XRD), transmission electron microscope (TEM), X-ray photoelectron spectros...

Anatase/rutile mixed titania nanotubes (TiO2 NTs) precipitated with gold nanoparticles (Au NPs), i.e. Au/TiO2, have been synthesized and investigated on visible photocatalysis properties. A deposition-precipitation (DP) method was adopted to reduce the gold precursor to Au NPs within the preformed TiO2 NTs by the emulsion electrospinning technique. The optimal visible photocatalytic activity wa...

PURPOSE The use of nanoparticles has seen exponential growth in the area of health care, due to the unique physicochemical properties of nanomaterials that make them desirable for medical applications. The aim of this study was to examine the effects of crystal phase-nanostructured titanium dioxide particles on bioactivity/cytotoxicity in breast cancer epithelial cells. MATERIALS AND METHODS ...

The catalytic performances of TiO2-supported Ni catalysts for the methanation CO2 have been investigated using different crystalline phases TiO2 (rutile and anatase). activity depends appreciably on nature support. rate hydrogenation decreases in order 10Ni/TiO2-rutile ≫ 10Ni/TiO2-anatase. use a mixture containing 70% 10Ni/TiO2-anatase + 30% allows significant increase reaction related to 100% ...

T w o crystallographic forms of TiC>2 (rutile and anatase) were subject to a n extended x r a y absorption fine structure study a t the K threshold of t i tanium. D a t a analysis was carried out b y Fourier methods and curve fitting techniques. Using the theoretical phases, T i 0 bond distances of 1.93(1) A were derived both for ruti le and anatase, as compared to the crystallographic values o...