Development of Magnetic Nanostructured Silica-Based Materials as Potential Vectors for Drug-Delivery Applications
2006; American Chemical Society; Volume: 18; Issue: 7 Linguagem: Inglês
10.1021/cm051646z
ISSN1520-5002
AutoresManuel Arruebo, Marta Galán, Nuria Navascués, Carlos Téllez, C. Marquina, M. R. Ibarra, Jesús Santamarı́a,
Tópico(s)Electrocatalysts for Energy Conversion
ResumoMetallic iron nanoparticles were synthesized within micron-sized mesoporous molecular sieves (with 2.9-nm pores) and hollow silica microcapsules (pores of 2.7 and 15 nm) using several cycles of wet impregnation under vacuum, followed by drying, oxidation, and reduction steps. For iron-loaded MCM-48, SQUID measurements revealed ferromagnetic behavior at room temperature with a magnetic moment as high as 3.40 emu/g (measured at 2 T) after four deposition cycles. Iron-loaded hollow silica microcapsules (250-nm wall thickness) showed a magnetic moment of 2.40 emu/g (at 2 T) after three deposition cycles and a coercivity as low as 12.9 Oe.
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