Engineered magnetic core-shell SiO2/Fe microspheres and "medusa-like" microspheres of SiO2/iron oxide/carbon nanofibers or nanotubes

On Mero; Moulay Tahar Sougrati; Jean Claude Jumas; Shlomo Margel

doi:10.1021/la502142m

Engineered magnetic core-shell SiO₂/Fe microspheres and "medusa-like" microspheres of SiO₂/iron oxide/carbon nanofibers or nanotubes

On Mero, Moulay Tahar Sougrati, Jean Claude Jumas, Shlomo Margel

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Iron oxide (IO) thin coatings of controlled thickness on SiO₂ microspheres of narrow size distribution were prepared by decomposition at 160 °C of triiron dodecacarbonyl onto silica microspheres dispersed in diethylene glycol diethyl ether free of surfactant or stabilizer. The dried washed SiO₂/IO core-shell microspheres were annealed at different temperatures and time periods under inert (Ar) or reducing (H₂) atmosphere. The effect of temperature on the chemical composition, morphology, crystallinity, and magnetic properties of the IO and the elemental Fe nanoparticles type coatings onto the SiO₂ core microspheres has been elucidated. "Medusa-like" SiO₂/IO/carbon nanofibers and tubes particles were prepared by CVD of ethylene on the surface of the SiO ₂/IO microspheres at different temperatures. The morphology change of the grafted carbon nanofibers and tubes as a function of the CVD temperature was also elucidated.

Original language	English
Pages (from-to)	9850-9858
Number of pages	9
Journal	Langmuir
Volume	30
Issue number	32
DOIs	https://doi.org/10.1021/la502142m
State	Published - 19 Aug 2014

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10.1021/la502142m

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abstract = "Iron oxide (IO) thin coatings of controlled thickness on SiO2 microspheres of narrow size distribution were prepared by decomposition at 160 °C of triiron dodecacarbonyl onto silica microspheres dispersed in diethylene glycol diethyl ether free of surfactant or stabilizer. The dried washed SiO2/IO core-shell microspheres were annealed at different temperatures and time periods under inert (Ar) or reducing (H2) atmosphere. The effect of temperature on the chemical composition, morphology, crystallinity, and magnetic properties of the IO and the elemental Fe nanoparticles type coatings onto the SiO2 core microspheres has been elucidated. {"}Medusa-like{"} SiO2/IO/carbon nanofibers and tubes particles were prepared by CVD of ethylene on the surface of the SiO 2/IO microspheres at different temperatures. The morphology change of the grafted carbon nanofibers and tubes as a function of the CVD temperature was also elucidated.",

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AU - Mero, On

AU - Sougrati, Moulay Tahar

AU - Jumas, Jean Claude

AU - Margel, Shlomo

PY - 2014/8/19

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AB - Iron oxide (IO) thin coatings of controlled thickness on SiO2 microspheres of narrow size distribution were prepared by decomposition at 160 °C of triiron dodecacarbonyl onto silica microspheres dispersed in diethylene glycol diethyl ether free of surfactant or stabilizer. The dried washed SiO2/IO core-shell microspheres were annealed at different temperatures and time periods under inert (Ar) or reducing (H2) atmosphere. The effect of temperature on the chemical composition, morphology, crystallinity, and magnetic properties of the IO and the elemental Fe nanoparticles type coatings onto the SiO2 core microspheres has been elucidated. "Medusa-like" SiO2/IO/carbon nanofibers and tubes particles were prepared by CVD of ethylene on the surface of the SiO 2/IO microspheres at different temperatures. The morphology change of the grafted carbon nanofibers and tubes as a function of the CVD temperature was also elucidated.

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Engineered magnetic core-shell SiO₂/Fe microspheres and "medusa-like" microspheres of SiO₂/iron oxide/carbon nanofibers or nanotubes

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