The core-shell particles consisting of poly(butyl acrylate)(PBA) core and silica shell were synthesized. The 3-methacryloxy propyl trimethoxysilane (MPS) was used as functional comonomer to modify the PBA latex partic...The core-shell particles consisting of poly(butyl acrylate)(PBA) core and silica shell were synthesized. The 3-methacryloxy propyl trimethoxysilane (MPS) was used as functional comonomer to modify the PBA latex particle surface with silanol(SiOH) groups via semicontinuous emulsion polymerization. The resulted emulsion was transferred into water/ethanol mixture without loss of stability and functionalized PBA latex was used as seeds for further silica shell growth. The coating process was achieved by Stber method, base-catalyzed hydrolysis and condensation of tetraethoxysilane(TEOS). The functionalized latex and core/shell particles were characterized by using differential thermal analysis(DTA), transmission electron microscope and light scattering. It has been confirmed that the PBA latex particles have been entirely enveloped with silica shell and the core/shell particles are monodisperse. The thickness of silica shell can be estimated by the size difference of functionalized PBA-SiO 2 core-shell particles.展开更多
A new route for the preparation of silver nanoshells on silica spheres, leading to the establishment of a simple, efficient and easy-to-scale-up way for the synthesis of smooth silver nanoshells on silica monodisperse...A new route for the preparation of silver nanoshells on silica spheres, leading to the establishment of a simple, efficient and easy-to-scale-up way for the synthesis of smooth silver nanoshells on silica monodispersed spheres, is reported through transforming the silver oxide shell to zero-valence silver by thermal cracking, applying surface strain theory to alter the shape of core-metal shell colloidal and form smooth metal nanoshell in hot inert flowing liquid. SEM images show that the silver nanoshells may be formed at 130 ℃ and deformed at 180 ℃ in hot inert flowing liquid. XRD indicates the formation of cubic structure pure silver with high crystallinity. Also, EDX and UV diffuse reflection spectrum analyses were conducted to characterize the as-prepared samples.展开更多
文摘The core-shell particles consisting of poly(butyl acrylate)(PBA) core and silica shell were synthesized. The 3-methacryloxy propyl trimethoxysilane (MPS) was used as functional comonomer to modify the PBA latex particle surface with silanol(SiOH) groups via semicontinuous emulsion polymerization. The resulted emulsion was transferred into water/ethanol mixture without loss of stability and functionalized PBA latex was used as seeds for further silica shell growth. The coating process was achieved by Stber method, base-catalyzed hydrolysis and condensation of tetraethoxysilane(TEOS). The functionalized latex and core/shell particles were characterized by using differential thermal analysis(DTA), transmission electron microscope and light scattering. It has been confirmed that the PBA latex particles have been entirely enveloped with silica shell and the core/shell particles are monodisperse. The thickness of silica shell can be estimated by the size difference of functionalized PBA-SiO 2 core-shell particles.
文摘A new route for the preparation of silver nanoshells on silica spheres, leading to the establishment of a simple, efficient and easy-to-scale-up way for the synthesis of smooth silver nanoshells on silica monodispersed spheres, is reported through transforming the silver oxide shell to zero-valence silver by thermal cracking, applying surface strain theory to alter the shape of core-metal shell colloidal and form smooth metal nanoshell in hot inert flowing liquid. SEM images show that the silver nanoshells may be formed at 130 ℃ and deformed at 180 ℃ in hot inert flowing liquid. XRD indicates the formation of cubic structure pure silver with high crystallinity. Also, EDX and UV diffuse reflection spectrum analyses were conducted to characterize the as-prepared samples.
