Hollow sub-microsphere as well as preparation method and application thereof
A submicron, hollow technology, applied in the field of organic-inorganic hybrid hollow submicron spheres and their preparation, can solve the problems of wide particle size distribution of hollow microspheres, complex system components, and a large amount of organic solvents, and achieves large specific surface area, The effect of simple system composition and simple process
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Embodiment 1
[0051] The raw materials are 3-methacryloyloxypropyltrimethoxysilane (TPM), silica colloid particles (Ludox TM40) with a particle size of 30 nm, isoamyl acetate (PEA), and the initiator is potassium persulfate. Add 0.5mL TPM, 0.65mL silica colloidal particle dispersion, 1mL PEA into 40mL water, stir at 15°C for 16 hours, pass nitrogen gas for 30 minutes, then raise the temperature to 70°C, add 10mg potassium persulfate to initiate polymerization, polymerization reaction Lasts 12 hours. The resulting emulsion was centrifuged, washed three times with ethanol, dispersed in water, and freeze-dried to obtain a white powdery solid.
[0052] The above-mentioned powder was dispersed in ethanol to make a transmission electron microscope sample and a scanning electron microscope sample, and the particle morphology was observed. Such as figure 1 As shown, the particles have an obvious hollow structure, and there are nanoparticles embedded in the shell, and partly exposed; the shell als...
Embodiment 2
[0054] The raw materials are 3-methacryloyloxypropyltrimethoxysilane (TPM), silica colloid particles (Ludox HS40) with a particle size of 12 nm, isoamyl acetate (PEA), and the initiator is potassium persulfate. Add 1mL TPM, 0.28mL silica colloidal particle dispersion, 2mL PEA into 40mL water, stir at 20°C for 24 hours, pass nitrogen gas and exhaust oxygen for 30 minutes, then raise the temperature to 65°C, add 10mg potassium persulfate to initiate polymerization, and the polymerization reaction continues 12 hours. The resulting emulsion was centrifuged, washed three times with ethanol, dispersed in water, and freeze-dried to obtain a white powdery solid.
[0055] The above-mentioned powder was dispersed in ethanol to make a transmission electron microscope sample and a scanning electron microscope sample, and the particle morphology was observed. Such as figure 2 As shown, the particles have an obvious hollow structure, and there are nanoparticles embedded in the shell, and...
Embodiment 3
[0057] The raw materials are 3-methacryloyloxypropyltrimethoxysilane (TPM), silica colloid particles (Ludox HS40) with a particle size of 7 nm, isoamyl acetate (PEA), and the initiator is potassium persulfate. Add 1mL TPM, 0.225mL silica colloidal particle dispersion, 2mL PEA into 40mL water, stir at 20°C for 24 hours, pass nitrogen gas and exhaust oxygen for 30 minutes, then raise the temperature to 65°C, add 10mg potassium persulfate to initiate polymerization, and the polymerization reaction continues 12 hours. The resulting emulsion was centrifuged, washed three times with ethanol, dispersed in water, and freeze-dried to obtain a white powdery solid.
[0058] The above-mentioned powder was dispersed in ethanol to make a transmission electron microscope sample and a scanning electron microscope sample, and the particle morphology was observed. Such as image 3 As shown, the particles have an obvious hollow structure, and there are nanoparticles embedded in the shell, and ...
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