Photoinduced reactivity of titanium dioxide

Significance of calcium phosphate coatings for the enhancement of new bone osteogenesis – A review ☆

Antibacterial titanium surfaces for medical implants

Agglomeration and sedimentation of TiO2 nanoparticles in cell culture medium

Antibacterial metals and alloys for potential biomedical implants.

Silver doped titanium oxide coatings for biomedical application were prepared by ion beam assisted deposition in an oxygen atmosphere. X-Ray photoelectron spectroscopy (XPS) was used to examine the chemical states and composition. Critical surface tension, dispersive and polar components of the surface energy were investigated by contact angle analysis. The influence of experimental conditions on the chemical states, composition and surface energy were investigated. The chemical state of silver was not affected by the process parameters and silver existed always in metallic state. XPS analysis confirmed the presence of TiO, Ti2O3 and TiO2, and the concentrations of the different oxidation states were influenced by the deposition rate of Ti and Ag. The oxygen flow rate had only a minor influence. On the other hand, dispersive and polar components of the surface energy were significantly affected by the oxygen atmosphere. The results also showed that samples with a higher concentration of silver exhibited a somewhat larger critical surface tension.

Surface properties of silver doped titanium oxide films

Titanium oxide film was coated on the surface of low temperature isotropic carbon (LTI-carbon) by ion beam enhanced deposition (IBED) to improve the blood compatibility of the LTI-carbon mechanical heart valve. The prepared film was found to be polycrystalline with Ti 2+ , Ti 3+ and Ti 4+ coexisting. This oxygen-lack n-type semiconductor film exhibits a better hemocompatibility than that of LTI-carbon in both in vitro and in vivo investigations. The reason is attributed to the surface energy and work function, which are two influencing factors on blood compatibility.

Improvement of blood compatibility of artificial heart valves via titanium oxide film coated on low temperature isotropic carbon

A filtered arc-deposition system was used to synthesize titanium oxide films by evaporating titanium ions in an oxygen environment. Fourier transform infrared spectroscopy and X-ray diffraction analysis show that the films exhibit the rutile-type structure. X-ray photoelectron spectroscopy reveals that a small amount of Ti 2+ and Ti 3+ still exists although Ti 4+ is the main component in the films. The preferred orientation of the films is dependent on the substrate bias and oxygen pressure. Titanium oxide films with (101) and (002) preferred orientation were prepared by changing substrate bias and oxygen pressure. Ultraviolet–visible absorption spectroscopy was used to determine the optical band gap of the prepared films. The results show that the band gap of the films prepared under zero substrate bias is 2.39 eV. When the substrate bias is larger than −100 V, the optical band gap of the films is about 3.33 eV.

Rutile-type titanium oxide films synthesized by filtered arc deposition

TiO2−x films were prepared by ion beam assisted deposition on an EATON Z-200 system, during which concurrent electron beam evaporation of titanium and bombardment with an inert gas ion beam were carried out in an O2 atmosphere. Xe+ and Ne+ ions with different current density and incident angles were used. The films were investigated using X-ray diffraction (XRD), glancing incident X-ray diffraction (GIXRD), X-ray photoelectron spectroscopy (XPS) and Rutherford backscattering spectroscopy (RBS). RBS analysis shows that the films are nearly stoichiometric. XPS measurements reveal that the surface was fully oxidized, but Ti2+, Ti3+ and Ti4+ coexist on the Ar+-sputtered surface. XRD and GIXRD analyses show that almost all the films have rutile-type structure and (2 0 0) preferred orientation. After annealing the 2θ angle shift to higher degrees and the (2 0 0) peak intensity increases, which means better crystallization and orientation.

Xianghui Wang

Papers

Surface properties of silver doped titanium oxide films

Improvement of blood compatibility of artificial heart valves via titanium oxide film coated on low temperature isotropic carbon

Rutile-type titanium oxide films synthesized by filtered arc deposition

TiO2−x films prepared by ion beam assisted deposition

Competitive adsorption behavior of human serum albumin and fibrinogen on titanium oxide films coated on LTI-carbon by IBED