A simple method for preparing titanium dioxide multi-shell hollow spheres and sphere-in-sphere structures
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A technology of titanium dioxide and hollow spheres, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, nanostructure manufacturing, etc., to achieve the effect of simple and easy method
Inactive Publication Date: 2011-12-07
INST OF CHEM CHINESE ACAD OF SCI
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So far, the preparation of multi-shell hollow spher...
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Embodiment 1
[0029] Preparation of multi-shell hollow spheres
[0030] 1) Prepare porous polymer spheres as templates:
[0031] ① Prepare polystyrene microspheres as seed bulbs. Dissolve polyvinylpyrrolidone (2.0g) in a mixed solvent of ethanol (60.4g) and water (7.6g), then add styrene (30g) and azobisisobutylacetonitrile (0.3g), protect with nitrogen for 30min, and stir at 100rpm 30min, then be warming up to 70 DEG C, react 12h. After the reaction, it was centrifuged and washed several times with water and ethanol. structured as figure 1 shown.
[0032] ② Disperse the bulbs in 0.4% sodium lauryl sulfate aqueous solution (0.27g / ml). Then azobisisobutylcyanide (0.026g) was dissolved in polystyrene (4.4ml), added to aqueous sodium lauryl sulfate solution (30ml, 0.4%), and emulsified in an ultrasonic bath. Add the above-mentioned emulsion dropwise to the bulb dispersion, keep it warm at 35°C for 12 hours, remove the upper layer of oil layer that has not been absorbed by the bulbs with ...
Embodiment 2
[0039] Preparation of sphere-in-sphere structures
[0040] 1) Prepare porous polymer spheres as templates:
[0041] ① Prepare polystyrene microspheres as seed bulbs. Dissolve polyvinylpyrrolidone (2.0g) in a mixed solvent of ethanol (60.4g) and water (7.6g), then add styrene (30g) and azobisisobutylacetonitrile (0.3g), protect with nitrogen for 30min, and stir at 100rpm 30min, then be warming up to 70 DEG C, react 12h. After the reaction, it was centrifuged and washed several times with water and ethanol.
[0042] ② Disperse the bulbs in 0.4% sodium lauryl sulfate aqueous solution (0.27g / ml). Then azobisisobutylcyanide (0.026g) was dissolved in polystyrene (4.4ml), added to aqueous sodium lauryl sulfate solution (30ml, 0.4%), and emulsified in an ultrasonic bath. Add the above-mentioned emulsion dropwise to the bulb dispersion, keep it warm at 35°C for 12 hours, remove the upper layer of oil layer that has not been absorbed by the bulbs with a separatory funnel, and then a...
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Abstract
The invention provides a simple method for preparing titanium dioxide multi-shell hollow spheres and a sphere-in-sphere structure. The method comprises the following steps: 1) adopting a dispersion polymerization method to prepare polystyrene used as seed spheres; 2) adopting a seed swelling polymerization method to prepare porous polystyrene-divinylbenzene high-polymer microspheres; 3) preparing titanium dioxide sol and a polymer/titanium dioxide composite: using isopropyl titanate, ethanol, deionized water and nitric acid to prepare the titanium dioxide sol, extracting the polymer microspheres prepared in the step 2) with toluene to be used as the polymer template and dispersing the polymer template in the titanium dioxide sol to prepare the polymer/titanium dioxide composite; and 4) putting the polymer/titanium dioxide composite in a muffle furnace which is preheated to 300-550 DEG C, and calcining to remove the polymer template and obtain the titanium dioxide multi-shell hollow spheres and sphere-in-sphere structure. The method provided by the invention is simple and practical and can be used to obtain the multi-shell hollow spheres and sphere-in-sphere structure. However, the traditional template-removing method can only obtain the porous titanium dioxide solid structure.
Description
technical field [0001] The invention relates to a simple method for preparing titanium dioxide multi-shell hollow spheres and sphere-in-sphere structures. Background technique [0002] Titanium dioxide is considered to be one of the most promising semiconductor materials. It is non-toxic, stable, and cheap, and has a wide range of applications in catalysis, photochromism, electrochromism, and hydrogen storage. Due to the characteristics of quantum size effect, small size effect, and surface effect, titanium dioxide nanostructures have more excellent performance than bulk materials. Among many nanostructures, titanium dioxide hollow spheres have attracted much attention due to their advantages of light weight and large specific surface, and they have been widely used in the fields of drug sustained release, dyes, inks, artificial cells, photonic crystals, and catalysis. Strong research interest. However, recent studies have shown that hollow spheres with complex microstruct...
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