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- W2364399833 abstract "The monodisperse SiO_2-coated polystyrene(PS)(PS/SiO_2) core-shell nanocomposite microspheres were prepared by a simple and low-cost method.The PS nanospheres were first synthesized in the presence of polyvinylpyrrolidone(PVP),and the SiO_2 particles were subsequently coated on the surface of the PS nanospheres by sol-gel process in NH_4OH/ethanol solutions.The preparation of the PS nanospheres is accomplished in aqueous media and has following advantages:no comonomer is needed,the cheap potassium persulfate(K_2S_2O_8) radical initiator is used instead of the expensive azodiisobutyramidine dihydrochloride(AIBA) radical initiator,and no exchange of the solvent and no centrifugal process are needed before the process of coating the SiO_2 particles on the PS nanospheres.The influences of the content of the PVP,NH_4OH,and tetraethyl orthosilicate(TEOS) on the size and morphology of the PS/SiO_2 nanocomposite microspheres were investigated.With increasing the content of PVP,the size of the PS nanospheres decreased,and thus smaller PS/SiO_2 nanocomposite microspheres were obtained.The content of NH_4OH did not affect the thickness of the SiO_2 shell,bus it influenced the morphology of the SiO_2 shell.The surface of the SiO_2 shell changed from smoothness to roughness with increasing content of NH_4OH.With increasing content of TEOS,the generated SiO_2 particles increased,and thus the thickness of the SiO_2 shell increased." @default.
- W2364399833 created "2016-06-24" @default.
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- W2364399833 date "2009-01-01" @default.
- W2364399833 modified "2023-09-23" @default.
- W2364399833 title "PREPARATION AND CHARACTERIZATION OF PS/SiO_2 NANOCOMPOSITE MICROSPHERES" @default.
- W2364399833 hasPublicationYear "2009" @default.
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