Synthesis and characterization of Inorganic core polymer shell hybrid nanoparticles
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We have successfully synthesized core−shell nanoparticles with a silica fluorescent core and a methacrylate shell for application in photoactive high performance coatings and paints. Silica core particles with diameters between 270 and 440 nm and low polydispersity were labeled with a perylenediimide derivate with two terminal alkoxysilyl groups. Pure silica nanoparticles with equivalent diameters were also synthesized and surface modified with a second perylenediimide derivative. The photophysical properties of both sets of nanoparticles were studied for polarity environment dependence and dye aggregation. The fluorescent silica nanoparticles were surface modified with 3-(trimethoxysilyl)propyl methacrylate and used as seeds in the emulsion polymerization of a butyl or methyl methacrylate shell. Fluorescence correlation spectroscopy (FCS) was used to characterize the core−shell nanoparticles, using the fluorescent silica particles to calibrate the system. Films cast from water dispersions of clean core−shell nanoparticles are flexible, transparent, and exhibit fluorescence under appropriate excitation.
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As attractive building blocks of advanced functional materials, core -shell structure nanoparticles have many unique properties which are different from those of mono - component colloidal particles. The synthesis methods of core -shell structure nanoparticles were reviewed in this paper, including surface precipitation method, polymerization method and assembling technique. The characterization techniques and application of core - shell structure nanoparticles were also introduced simply.
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Silica nanoparticles with functional polymer shell based on reactive peroxide-containing copolymers were synthesized via sol-gel method.Unimodal nanoparticles of spherical shell with the size of 190-350 nm and low polydispersity index were obtained.The influence of copolymer nature and concentration, catalyst concentration, onto process kinetics and nanoparticle size was studied.The formation of functional polymeric shell on the surface of silica nanoparticles was proved using the methods of gas-liquid chromatography and complex thermal analysis.Кеу words: nanoparticles, silica
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The use of multicomponent solvent systems and multiply functionalized emulsifiers opens a versatile avenue to high-quality nanocomposites. Quantitative transfer of inorganic particles from an aqueous dispersion directly to hydrophobic solvent, where aggregation of the particles is fully suppressed, can be achieved on a large scale. Due to additional functionality on the surfaces, the particles can interact with a polymer matrix, allowing formation of homogeneous organic–inorganic hybrid materials.
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