氨基硅烷化磁性纳米粒子的制备与表征

Synthesis and characterization of magnetic nanoparticles modified by 3-aminopropyltriethoxy-silane

采用化学共沉淀法,以FeCl3.6H2O和FeSO4.7H2O为原料制备磁性Fe3O4纳米颗粒,采用3-氨丙基三乙氧基硅烷(APTES)偶联剂对其进行修饰,获得表面氨基化的磁性Fe3O4纳米复合颗粒。通过FTIR、TEM、TGA、VSM和氨基测定等分析手段对其结构和性能进行了表征,分析了硅烷试剂使用量对磁性纳米复合微球磁性能和包覆率的影响。结果表明:APTES成功包覆到磁性纳米粒子表面,包覆层随着硅烷用量增加逐渐趋于完整并增厚;当硅烷用量较少时,随着用量的增加,磁性能略有提高,而当硅烷用量达到一定值之后,继续增加用量,磁性能降低。

Superparamagnetic Fe304 nanoparticles were first synthesized by hydrothermal coprecipitation of ferric and ferrous ions, followed by the modification of their surfaces with 3-aminopropyhriethoxy-silane （APTES）. The structure and properties of as-synthesized nanoparticles were characterized by FTIR,TEM,TGA,and vibrating sample magnetometer （VSM）. The results indicate that nanoparticles are coated successfully by APTES. The coat- ing layer gradually becomes complete and thicker with the addition of APTES. It also shows that the magnetic properties of magnetic nanocomposites are enhanced with the addition of APTES within certain degree. Beyond this, the magnetic performance decreases.