Core-shell structure nano composite particle system with gradient-changing shell-core ratio and preparation method thereof
A gradient change and nano-composite technology, applied in the core-shell structure nano-composite particle system and its preparation field, can solve the problems of complex synthesis process and difficulty in large-scale production, and achieve low cost, novel preparation method and short cycle Effect
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Embodiment 1
[0051] This implementation case shows a preparation method of a core-shell structure nanocomposite particle system with a gradient change in the core-shell ratio according to the following steps:
[0052] A PVP and Ludox AS40 SiO with molecular weights of 8 kDa, 40 kDa, 360 kDa and 1300 kDa 2 The steps of preparing a core-shell structure nanocomposite particle system with a gradient change in shell-core ratio as raw materials are as follows:
[0053] (1) Prepare four PVP solutions with molecular weights of 8 kDa, 40 kDa, 360 kDa and 1300 kDa respectively, with a volume of 200ml and a concentration of 0.1wt%.
[0054] (2) Prepare four 150 ml portions of SiO with a concentration of 0.2wt% 2 nanoparticle dispersion.
[0055] (3) The above four SiO 2 The nanoparticle dispersion was added dropwise into four vigorously stirred PVP solutions with molecular weights of 8 kDa, 40 kDa, 360 kDa and 1300 kDa, the stirring rate was 300 rpm, and the stirring was continued for 8 h to ensur...
Embodiment 2
[0062] This implementation case shows a preparation method of a core-shell structure nanocomposite particle system with a gradient change in the core-shell ratio according to the following steps:
[0063] A PVP and Ludox AS40 SiO with molecular weights of 8 kDa, 40 kDa, 360 kDa and 1300 kDa 2 The steps of preparing a core-shell structure nanocomposite particle system with a gradient change in shell-core ratio as raw materials are as follows:
[0064] (1) Prepare four PVP solutions with molecular weights of 8 kDa, 40 kDa, 360 kDa and 1300 kDa respectively, with a volume of 200ml and a concentration of 0.1wt%.
[0065] (2) Prepare four 150 ml portions of SiO with a concentration of 0.2wt% 2 nanoparticle dispersion.
[0066] (3) The above four SiO 2 The nanoparticle dispersion was added dropwise into four vigorously stirred PVP solutions with molecular weights of 8 kDa, 40 kDa, 360 kDa and 1300 kDa, the stirring rate was 800 rpm, and the stirring was continued for 5 h to ensur...
Embodiment 3
[0072] A PVP and Ludox AS40 SiO with molecular weights of 8 kDa, 40 kDa, 360 kDa and 1300 kDa 2 The steps of preparing a core-shell structure nanocomposite particle system with a gradient change in shell-core ratio as raw materials are as follows:
[0073] (1) Prepare four PVP solutions with molecular weights of 8 kDa, 40 kDa, 360 kDa and 1300 kDa respectively, with a volume of 200ml and a concentration of 0.1wt%.
[0074] (2) Prepare four 150 ml portions of SiO with a concentration of 0.2wt% 2 nanoparticle dispersion.
[0075] (3) The above four SiO 2 The nanoparticle dispersion was added dropwise into four vigorously stirred PVP solutions with molecular weights of 8 kDa, 40 kDa, 360 kDa and 1300 kDa, the stirring rate was 500 rpm, and the stirring was continued for 1 h to ensure that the SiO 2 The surface of the nanoparticles is completely adsorbed by PVP. After the adsorption is completed, the four PVP-SiO 2 The nanoparticle dispersion was centrifuged for 4 hours, and t...
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