| ABSTRACT : |
Abstract
A Method for magnetite-immobilization on AuSiO2 core-shell (Au/SiO2) particles is proposed a collied solution of 2.4×10-4 M
An nanoparticles with an average size of 16.9± 1.2nm was prepared by mixing HAUCL4 at 2.4×10-4 M and sodium citrate at 1.6×10-3 in water at 800c AU/SIO2 particles with an average size of 47.3±3.5nm were prepared by using a sol-gel method at 350c in ethonal with 2.0×10-5 M (3-aminopropy) trimethoxysilance as asilance couping agent 5.
×10-4 M tetraethylorthosilicateas and silica source,10.7M H2O and 5.0×10-4 M NaOH as a catalyst in the presence of 4.3 ×10-5 M an nanoparticles the Au/SiO2 particles were surface-modified with1.0g/l poly-diallyldimetheylammonium chloride at 4.3 ×10-5 M Au.preparation of colloid solution of magnetite nanoparticles with an average of 7.3±1.6nm was performed with a salt-base rection at room temperature in aqueous solution cantaining 7.2×10-2 M FeCl3 3.6×10-2 M FeCl2,3.6×10-2 M Hcl and 4.0×10-1 M NaOH the magnite nanoparticles were immobolization on the Au/SiO2 partious (Au/SiO2) magnetite) by mixing the AuSiO2 particles colloid solution with an Au concentration of 8.6×10-5 M and the magnetite nanoparticle colloid solution with Fe concentration of 3.0×10-4 M-3.0×10-3 M the Au/SiO2 magnetite particles preparted at the Fe concentration of 1.2×10-3 M and above were well drown close to magnet.these result confirmed that the propose method was suitable to magnetite-immobilization.
keyword: cose-shell,particle,Au,silica,magnetite.
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