In this research work, magnetic nanoparticles (NPs) of Fe₃O₄@nSiO₂@mSiO₂/DBU were designed as a novel effective heterogeneous catalyst for the production of polyhydroacridines and polyhydroquinolines. For characterizing the NPs, the Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscope (TEM), vibrating sample magnetometry (VSM), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and N₂ adsorption–desorption measurement (BET isotherm) techniques were used. Some advantages of this magnetic nanoparticle include: use of commercially available materials to make catalysts, appropriate and simple operation, excellent yields, appropriate catalytic activity, simple work-up, and recycle and reuse the catalyst up to seven times without considerable change in its catalytic activity.

在这项研究工作中，Fe ₃ O ₄ @nSiO ₂ @mSiO ₂ / DBU的磁性纳米颗粒（NPs）被设计为新型有效的非均相催化剂，用于生产聚氢ac啶和聚氢喹啉。为了表征NP，使用傅立叶变换红外光谱（FT-IR），扫描电子显微镜（SEM），透射电子显微镜（TEM），振动样品磁力法（VSM），热重分析（TGA），X射线衍射（XRD）和N ₂使用了吸附-解吸测量（BET等温线）技术。这种磁性纳米颗粒的一些优点包括：使用可商购的材料制造催化剂，适当而简单的操作，优异的收率，适当的催化活性，简单的后处理，以及多达7次的循环和再利用催化剂，而其催化性能没有明显变化活动。