Abstract
Magnetic silica-pillared clay with ordered layered structure and uniform gallery pore size distribution were synthesized by generating magnetic Fe3O4 nanoparticles onto the mesoporous silica-pillared clay hosts using molecular self-assembly method. The obtained magnetic silica-pillared clay samples have been characterized by elemental analysis (XRF), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption–desorption isotherms, Fourier transform infrared (FT-IR) spectra, X-ray photoelectron spectrometer (XPS) and transmission electron microscopy (TEM). Such results indicate that the formed magnetic silica-pillared clay keeps the ordered layered structure and uniform gallery pore size, and the magnetic nanoparticles generated onto the silica-pillared clay host is mainly composed of Fe3O4. Magnetic measurements reveal that these composites possess super paramagnetic properties at 300K, and the saturation magnetization increases with increasing Fe ratio loaded. These magnetic silica-pillared clays show sustained release profiles with acetylsalicylic acid as the model drug. The magnetic silica-pillared clay samples show higher release rate with respect to the general silica-pillared clay.
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