Template-Assisted Synthesis of Mesoporous Magnetic Nanocomposite Particles

✍ Scribed by P. Wu; J. Zhu; Z. Xu

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 217 KB
• Volume: 14
• Category: Article
• ISSN: 1616-301X
• DOI: 10.1002/adfm.200305455

✦ Synopsis

Abstract

A new concept is proposed to synthesize mesoporous magnetic nanocomposite particles of great scientific and technological importance. Mesoporous silica coatings were created on micrometer‐sized magnetite (Fe~3~O~4~) particles using cetyltrimethylammonium chloride micelles as molecular templates. The characterization by transmission electron microscopy (TEM), nitrogen adsorption–desorption, diffuse‐reflectance Fourier‐transform infrared spectroscopy, and zeta‐potential measurements confirmed the deposition of mesoporous silica thin layers on the magnetite particles. The synthesized particles showed a drastic increase in specific surface area with an average pore size of 2.5 nm. The coating material showed a negligible effect on the saturation magnetization of the original particles that were fully protected by silica coatings. The synthesized mesoporous magnetic nanocomposite particles have a wide range of applications in toxin removal, waste remediation, catalysis, reactive sorbents, and biological cell separations.