What is the difference between rutile and anatase titanium dioxide?
The key difference among them is in their appearance. Anatase Titanium Dioxide is colorless, whereas Rutile Titanium Dioxide is usually found in dark red appearance. Rutile titanium dioxide is optically positive, whereas Anatase titanium dioxide is optically negative.
Why is anatase a better photocatalyst than rutile?- Model studies on epitaxial tio2 films?
For anatase the activity increases for films up to ~5 nm thick, while rutile films reach their maximum activity for ~2.5 nm films already. This shows that charge carriers excited deeper in the bulk contribute to surface reactions in anatase than in rutile.
Is tio2 anisotropic?
The anisotropic overgrowth of TiO2 on AuNRs is further shown by TEM and HAADF-STEM-EDX analyses (Figures 2 and S4).
Is anatase more stable than rutile?
7), rutile is more stable than anatase. This has been confirmed by thermodynamic studies [5, 9, 76, 148, 152], which show that negative pressures would be required for anatase to be more stable than rutile [2]. The transformation to rutile thus is irreversible.
What is the use of rutile?
The main uses for rutile are the manufacture of refractory ceramic, as a pigment, and for the production of titanium metal. Finely powdered rutile is a brilliant white pigment and is used in paints, plastics, paper, foods, and other applications that call for a bright white color.
Why is rutile denser anatase?
The reconstructive anatase to rutile transformation involves a contraction of the c-axis and an overall volume contraction of *8% [109, 118, 119]. This volume contraction explains the higher density of rutile relative to anatase.
What is the ore of rutile?
| Physical Properties of Rutile | |
|---|---|
| Chemical Classification | Oxide |
| Chemical Composition | Titanium oxide, TiO2 |
| Crystal System | Tetragonal |
| Uses | An ore of titanium, pigments, inert coating on welding rods |
What is ilmenite made of?
ilmenite, iron-black, heavy, metallic oxide mineral, composed of iron and titanium oxide (FeTiO3), that is used as the major source of titanium. It forms solid-solution series with geikielite and pyrophanite in which magnesium and manganese, respectively, replace iron in the crystal structure.
How do you identify ilmenite?
Ilmenite is a black mineral with a submetallic to metallic luster. With just a glance it can easily be confused with hematite and magnetite. The differentiation is easy. Hematite has a red streak, while ilmenite has a black streak.