TY - JOUR
T1 - Synthesis and characterization of air-stable iron nanocrystalline particles based on a single-step swelling process of uniform polystyrene template microspheres
AU - Shpaisman, Nava
AU - Margel, Shlomo
PY - 2006/1/24
Y1 - 2006/1/24
N2 - Polystyrene template microspheres of narrow size distribution were prepared by dispersion polymerization of styrene in a mixture of ethanol and 2-methoxy ethanol. These template particles dispersed in aqueous solution have been used for entrapping Fe(CO)5, by a single-step swelling process of methylene chloride emulsion droplets containing Fe(CO)5, within these particles. The influence of different swelling parameters, such as the volume ratio [CH2Cl2/[Fe(CO)5], on the size and size distribution of the swollen template particles was elucidated. Air-stable Fe/Fe3C nanocrystalline particles have been prepared by thermal decomposition of the Fe(CO)5 swollen template particles at 600°C in an inert atmosphere. Characterization of these air-stable Fe/Fe3C nanocrystalline particles has been accomplished by light microscopy, TEM, XRD, TGA, XPS, elemental analysis, and magnetic susceptibility measurements. These nanocrystalline particles have a core - shell structure where a coating of Fe3C and carbon protects the core body-centered cubic Fe from oxidation.
AB - Polystyrene template microspheres of narrow size distribution were prepared by dispersion polymerization of styrene in a mixture of ethanol and 2-methoxy ethanol. These template particles dispersed in aqueous solution have been used for entrapping Fe(CO)5, by a single-step swelling process of methylene chloride emulsion droplets containing Fe(CO)5, within these particles. The influence of different swelling parameters, such as the volume ratio [CH2Cl2/[Fe(CO)5], on the size and size distribution of the swollen template particles was elucidated. Air-stable Fe/Fe3C nanocrystalline particles have been prepared by thermal decomposition of the Fe(CO)5 swollen template particles at 600°C in an inert atmosphere. Characterization of these air-stable Fe/Fe3C nanocrystalline particles has been accomplished by light microscopy, TEM, XRD, TGA, XPS, elemental analysis, and magnetic susceptibility measurements. These nanocrystalline particles have a core - shell structure where a coating of Fe3C and carbon protects the core body-centered cubic Fe from oxidation.
UR - http://www.scopus.com/inward/record.url?scp=33644530678&partnerID=8YFLogxK
U2 - 10.1021/cm0519232
DO - 10.1021/cm0519232
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AN - SCOPUS:33644530678
SN - 0897-4756
VL - 18
SP - 396
EP - 402
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 2
ER -