A kind of synthesis method of titanium dioxide self-assembled particles
A technology of titanium dioxide and synthesis methods, applied in the direction of titanium dioxide, titanium oxide/hydroxide, nanotechnology, etc., can solve problems such as operational hazards, equipment and experimenter hazards, and achieve easy operation, rich variety, and good ethanol dispersibility Effect
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Embodiment 1
[0042] At room temperature and under magnetic stirring conditions, 20 mL of tetraisopropyl titanate was dropped into 120 mL of ultrapure water at 10 mL / min, and white flocculent precipitates gradually appeared. Add 40mL of 25wt% tetrapropylammonium hydroxide aqueous solution to the above system at 20mL / min, and the white precipitate in the solution gradually disappears. Transfer the above solution to a 200mL static reaction kettle, seal it, and put it into a 120°C drying oven to react for 24 hours. Take out the reaction kettle, and after cooling down to room temperature naturally, the white powder will be separated by centrifugation. Washed with ultrapure water three times, each time the white powder was separated by centrifugation at a speed of 8000 rpm, and finally dried at 70°C for 24 hours to collect the white powder and obtain product A for scanning and transmission electron microscope observation. SEM results show that the appearance is cauliflower-like, with a size of ...
Embodiment 2
[0044] According to the process of Example 1, with TiCl 4 For titanium precursor, TiCl 4 The addition amount was 5 mL, and the sample treatment conditions were the same as in Example 1 to obtain product B, which was used for scanning electron microscopy and transmission observation. The SEM results show that the appearance is a mixture of cauliflower and rod shapes, the size of the cauliflower shape is about 200nm, the length of the rod shape is about 300 nm, and the diameter is about 50nm; the electron diffraction results of the transmission electron microscope show that the titanium dioxide is an anatase structure; the high resolution results of the transmission electron microscope show that the titanium oxide particles are It is formed by axial self-assembly of anatase titanium dioxide nanowires.
Embodiment 3
[0046] According to the process of Example 1, 25mL of tetraisobutyl titanate was dropped into 120mL of deionized water to form a white flocculent precipitate, and 30mL of 15wt% tetramethylammonium hydroxide aqueous solution was added to the above system at 20mL / min , the white precipitate in the system gradually disappeared and turned into a transparent solution. Transfer the above solution to a 200mL static reaction kettle, seal it, and put it in a 140°C drying oven to react for 12 hours. The reactor was taken out, and after being naturally cooled to room temperature, the white powder was separated by centrifugation, and the centrifugation speed was 7000rpm. The sample processing conditions were the same as in Example 1, and the product C was obtained, which was used for scanning and transmission electron microscope observation. The SEM results showed that the appearance was cauliflower-shaped and the size was about 300nm; the electron diffraction results of the transmission e...
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