Institute for Tropical Technology (ITT)-Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam.
Nanoscale. 2017 Jul 6;9(26):8952-8961. doi: 10.1039/c6nr09325f.
High magnetisation and monodisperse CoFe alloy nanoparticles are desired for a wide range of biomedical applications. However, these CoFe nanoparticles are prone to oxidation, resulting in the deterioration of their magnetic properties. In the current work, CoFe alloy nanoparticles were prepared by thermal decomposition of cobalt and iron carbonyls in organic solvents at high temperatures. Using a seeded growth method, we successfully synthesised chemically stable CoFe@Pt core/shell nanostructures. The obtained core/shell nanoparticles have high saturation magnetisation up to 135 emu g. The magnetisation value of the core/shell nanoparticles remains 93 emu g after being exposed to air for 12 weeks. Hydrophobic CoFe@Pt nanoparticles were rendered water-dispersible by encapsulating with poly(maleic anhydride-alt-1-octadecene) (PMAO). These nanoparticles were stable in water for at least 3 months and in a wide range of pH from 2 to 11.
高磁化率和单分散的 CoFe 合金纳米粒子在广泛的生物医学应用中是需要的。然而，这些 CoFe 纳米粒子容易氧化，导致其磁性能恶化。在目前的工作中，CoFe 合金纳米粒子是通过在有机溶剂中高温热解二羰基钴和二羰基铁来制备的。我们使用种子生长法成功合成了化学稳定的 CoFe@Pt 核/壳纳米结构。所得到的核/壳纳米粒子具有高达 135 emu g 的饱和磁化强度。核/壳纳米粒子的磁化值在暴露于空气中 12 周后仍保持 93 emu g。通过用聚（马来酸酐-alt-1-十八烯）（PMAO）包覆，将疏水性 CoFe@Pt 纳米粒子转化为水分散体。这些纳米粒子在水中至少稳定 3 个月，并在 pH 值从 2 到 11 的宽范围内稳定。
