Iron oxide silica Fe_xO_y-SiO₂ composite systems with aminopropyl (AP) groups on the surface have been synthesized via different routes. The surface modified samples have been studied by X-ray diffraction (XRD) analysis and IR spectroscopy. Magnetic phases of iron oxides have been detected after post-synthetic grafting of AP groups onto the surface of these composite systems. Magnetic properties of these samples have been determined. Only insignificant reduction in the material saturation magnetization and remanent magnetization have been registered upon surface grafting procedure. This approach has been considered to be successful as magnetic properties of the substrate were preserved. Amount of aminoalkyl groups grafted onto the silica composite surface has been determined by thermogravimetric analysis. The mass fraction of grafted aminoalkyl groups has been found to be dependent on the textural properties of the composite sample.

氧化铁二氧化硅Fe _x O _y -SiO ₂通过不同的途径合成了在表面具有氨基丙基（AP）基团的复合体系。已通过X射线衍射（XRD）分析和IR光谱研究了表面改性的样品。在将AP基团后合成接枝到这些复合系统的表面后，已经检测到氧化铁的磁相。这些样品的磁性已经确定。在表面接枝过程中，仅记录到材料饱和磁化强度和剩余磁化强度没有明显降低。由于保留了基板的磁性，这种方法被认为是成功的。通过热重分析已经确定了接枝到二氧化硅复合材料表面上的氨基烷基的量。