Preparation of composite hollow nano-structure
A technology of hollow nanoparticles and nanoparticles, which is applied in the preparation of microspheres, microcapsule preparations, etc., can solve problems such as the difficulty in controlling the composition, thickness and surface pore size of nano-hollow structures, limiting product types and application ranges, etc.
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Embodiment 1
[0014] Example 1: 5g of cerium oxalate nanoparticles with an average particle size of 5nm, 20ml of lanthanum nitrate aqueous solution and 30ml of dibutyl oxalate in toluene were dispersed in a high-speed emulsifier to prepare an oil-in-water Pickering emulsion. Wherein the concentration of lanthanum nitrate is 0.1mol / L, and the concentration of dibutyl oxalate is 0.15mol / L. The emulsion was then heated to 45°C and stirred at 50°C for 18h. Then the toluene is recovered by distillation under the reduced pressure of the water pump. The residue was washed three times each with deionized water and 95% ethanol. After the obtained precipitate was vacuum-dried at 45° C. for 3 hours, a composite nano-hollow structure of cerium oxalate / lanthanum oxalate was obtained. The diameter of the product measured by transmission electron microscope (TEM) and high resolution transmission electron microscope (HRTEM) is 355nm, the shell thickness is 27nm, and the surface pore size is 3nm.
Embodiment 2
[0015] Example 2: 4.5g of zinc oxide nanoparticles with an average particle size of 2nm, 10ml of a mixed aqueous solution of calcium chloride and urea, and 20ml of n-hexane were dispersed in a high-speed emulsifier to prepare an oil-in-water Pickering emulsion. Wherein the concentration of calcium chloride is 0.05mol / L, and the concentration of urea is 0.15mol / L. Then the emulsion was heated to 70°C, and the reaction was stirred at 70°C for 5h. Then, under the reduced pressure of the water pump, the n-hexane is recovered by distillation. The residue was washed three times each with deionized water and 95% ethanol. After the obtained precipitate was vacuum-dried at 50° C. for 2 hours, the zinc oxide / calcium carbonate composite nano-hollow structure was obtained. The diameter of the product measured by TEM and HRTEM is 672nm, the shell thickness is 41nm, and the surface pore size is 4nm.
Embodiment 3
[0016] Example 3: 1 g of zinc sulfide nanoparticles with an average particle size of 7 nm, 10 ml of cadmium nitrate aqueous solution, and 25 ml of ethylbenzene solution of thioacetamide were dispersed in a high-speed emulsifier to prepare a water-in-oil Pickering emulsion. Wherein the concentration of cadmium nitrate is 0.04mol / L, and the concentration of thioacetamide is 0.1mol / L. The emulsion was then heated to 50°C and stirred at 50°C for 7h. Then under the reduced pressure of the water pump, distill and recover ethylbenzene. The residue was washed three times each with deionized water and 95% ethanol. After the obtained precipitate was vacuum-dried at 35° C. for 3 hours, the cadmium sulfide / zinc sulfide composite nano-hollow structure was obtained. The diameter of the product measured by TEM and HRTEM is 226nm, the shell thickness is 19nm, and the surface pore size is 5nm.
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