A facile two-step modifying process for preparation of poly(SStNa)-grafted Fe{sub 3}O{sub 4}/SiO{sub 2} particles

Journal Article · Sat Mar 15 00:00:00 EDT 2008 · Journal of Solid State Chemistry

OSTI ID:21043914

Yanli, Li; Xiangyu, Wei ^[1]

---

1. Key Laboratory of Applied Surface and Colloid Chemistry, Shaanxi Normal University, Ministry of Education, School of Chemistry and Materials Science, Xi'an 710062 (China)

This article reports the synthesis of the poly(sodium 4-styrenesulfonate)-grafted Fe{sub 3}O{sub 4}/SiO{sub 2} particles via two steps. The first step involved magnetite nanoparticles (Fe{sub 3}O{sub 4}) homogeneously incorporated into silica spheres using the modified Stoeber method. Second, the modified silica-coated Fe{sub 3}O{sub 4} nanoparticles were covered with the outer shell of anionic polyelectrolyte by surface-initiated atom transfer radical polymerization. The resulted composites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive microscopy (EDS), Fourier transform-infrared (FT-IR), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and vibration sample magnetometer (VSM). The XRD results indicated that the surface modified Fe{sub 3}O{sub 4} nanoparticles did not lead to phase change compared with the pure Fe{sub 3}O{sub 4}. TEM studies revealed nanoparticles remained monodisperse. The detection of sulfur and sodium signals was a convincing evidence that sodium 4-styrenesulfonate was grafted onto the surface of the magnetic silica in XPS analysis. Finally, super-paramagnetic properties of the composite particles, and the ease of modifying the surfaces may make the composites of important use in mild separation, enzyme immobilization, etc. - Graphical abstract: shows TEM images of silica-coated Fe{sub 3}O{sub 4} particles. The magnetic silica particles with well-defined core/shell structures were rather monodisperse, even though silica shells have trapped more than one magnetic core. The Fe{sub 3}O{sub 4}/SiO{sub 2} particles used in this case for the production of composite particles had an average diameter of 70{+-}10 nm obtained by TEM images.

• OSTI ID: 21043914
• Journal Information: Journal of Solid State Chemistry, Vol. 181, Issue 3; Other Information: DOI: 10.1016/j.jssc.2007.12.004; PII: S0022-4596(07)00518-X; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
FOURIER TRANSFORMATION
INFRARED SPECTRA
IRON OXIDES
MAGNET CORES
MAGNETIC CORES
MAGNETITE
NANOSTRUCTURES
PARAMAGNETISM
POLYMERIZATION
SILICON OXIDES
SURFACES
SYNTHESIS
THERMAL GRAVIMETRIC ANALYSIS
TRANSMISSION ELECTRON MICROSCOPY
VIBRATING SAMPLE MAGNETOMETERS
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY