[This patent text was translated from Chinese to English and published about 10 years ago. Critical information has been modified before being posted here]
[71] Patent Holder: Wuhan University
Address: Luojiasan, Wuchang, Wuhan city, Hubei province 430072
[72] Inventor: Zhong Jiasheng, Jiu Lin, Luo Qirong, Gong Cuqing
Examinator: Wangjing
[54] Title of the Invention: A Type of Nano-titania and Its Preparation Method and Applications
[57] Abstract
This invention mainly involves the rosette nano-titania, its preparation method and its applications. The preparation process consists of following steps: Take the titanium sulfate as the major raw material; deposit and elute it in alkali to produce titanium oxynitrate; add in some additives; after being hydrolyzed, detached, washed, dried and appropriately thermal-treated under normal atmosphere, the rosette nano-titania can be obtained.
The principle of such method is that: rosette nano-titania can be produced by using simple technology and appropriate thermal treatment and taking cheap titanium sulfate as the major raw material. Such method is characteristic of easily-available source of raw materials, low cost, simple technology and controllability under large-scale production conditions. Such rosette nano-titania can be applied to prepare the compound stealth materials.
- A type of nano-titania with rosette-shaped particles, which features that: each petal (of the rosette shape) is of 1-10 nanometers thick and 60-400 nanometers long.
- A type of method for preparation of the nano-titania as described in Claim 1, which features the following steps: take the titanium sulfate as the major raw material, mix together the titanium sulfate and inorganic base to form the positive titanic acid deposition; elute such deposition and dissolve it in nitric acid to prepare titanium oxynitrate; add in sodium salicylate, sodium oxalate or sodium citrate as the crystal form initiator; then the rosette nano-titania is obtained after being hydrolyzed, detached, washed, dried and thermal-treated under normal atmosphere. In the process of mixing titanium sulfate and inorganic base, control the PH value within the range of 5-10, use ice-water bath for cooling, control the mixing speed, and maintain the temperature at below 50℃. The concentration of the water solution of titanium oxynitrate should be controlled within a range of 0.5-4 mol/liter; the addition volume of additives as the crystal-form reaction initiator should be controlled at 0.5-17%; the temperature and time for hydrolyzation at normal atmosphere should be 70-112℃ and 0.7-7 hours respectively; drying methods may include heat drying, freeze drying or microwave drying; the temperature and time for heat drying should be 100-300℃ and 1-12 hours respectively; the temperature and time for thermal treatment should be 300-700℃ and 1-8 hours respectively.
- A type of preparation method according to Claim 2, which features that: sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium acid carbonate or ammonia water can be used as the inorganic base.
- A type of nano-titania according to Claim 1, which can be used to prepare the compound stealth materials.
[This patent text was translated from Chinese to English and published about 10 years ago. Critical information has been modified before being posted here]