Silica-coated iron oxide magnetic nanoparticles to be employed as the starting core for easily-recoverable heterogeneous catalysts supports, were synthesized. We tuned both the properties of the magnetic core and of the covering shell, with particular emphasis on the optimization of the silica layer thickness. Afterwards, structural-sensitive techniques (XRD, BET surface area analysis), surface-sensitive techniques (ATR-IR, XPS), imaging (SEM, TEM), elemental analyses (ICP-MS) and magnetization analyses (AGFM), were employed to unravel the features of the synthesized materials. The oxidation of cis-cyclooctene with tert-butyl hydroperoxide in presence of MNPs was used as probe reaction to check the reactivity of the NPs and the effectiveness of the silica shield. The results of these tests showed its chemical inertia confirming the absence of any detrimental iron oxide catalyzed side-reactions or magnetic core modification.

合成了二氧化硅涂层的氧化铁磁性纳米粒子，用作易于回收的非均相催化剂载体的起始核。我们调整了磁芯和覆盖壳的性能，特别强调了二氧化硅层厚度的优化。之后，采用结构敏感技术（XRD，BET表面积分析），表面敏感技术（ATR-IR，XPS），成像（SEM，TEM），元素分析（ICP-MS）和磁化分析（AGFM）进行分析。揭示合成材料的特征。的氧化顺-cyclooctene与叔在存在MNP的情况下，使用氢过氧化丁基丁基作为探针反应，以检查NP的反应性和硅胶屏蔽层的有效性。这些测试的结果表明其化学惯性，证实了不存在任何有害的氧化铁催化的副反应或磁芯改性。