Natali Marco, Tamburini Sergio, Bertani Roberta, Desideri Daniele, Mozzon Mirto, Pavarin Daniele, Spizzo Federico, Del Bianco Lucia, Zorzi Federico, Sgarbossa Paolo
ICMATE, CNR, Corso Stati Uniti 4, 35127 Padova, Italy.
Department of Industrial Engineering, University of Padova, Via Marzolo 9 (P.S., R.B., M.M.), Via Gradenigo 6/a (D.D.) and Via Venezia 1 (D.P.), 35131 Padova, Italy.
Polymers (Basel). 2021 Apr 15;13(8):1284. doi: 10.3390/polym13081284.
The addition of magnetic particles to inorganic matrices can produce new composites exhibiting intriguing properties for practical applications. It has been previously reported that the addition of magnetite to concrete improves its mechanical properties and durability in terms of water and chloride ions absorption. Here we describe the preparation of novel magnetic geopolymers based on two different matrices (G1 without inert aggregates and G2 with inert quartz aggregates) containing commercial SrFeO particles with two weight concentrations, 6% and 11%. The composites' characterization, including chemical, structural, morphological, and mechanical determinations together with magnetic and electrical measurements, was carried out. The magnetic study revealed that, on average, the SrFeO magnetic particles can be relatively well dispersed in the inorganic matrix. A substantial increase in the composite samples' remanent magnetization was obtained by embedding in the geopolymer SrFeO anisotropic particles at a high concentration under the action of an external magnetic field during the solidification process. The new composites exhibit good mechanical properties (as compressive strength), higher than those reported for high weight concretes bearing a similar content of magnetite. The impedance measurements indicate that the electrical resistance is mainly controlled by the matrix's chemical composition and can be used to evaluate the geopolymerization degree.
向无机基体中添加磁性颗粒可以制备出具有有趣特性的新型复合材料，以用于实际应用。此前已有报道称，在混凝土中添加磁铁矿可改善其力学性能以及在吸水和吸收氯离子方面的耐久性。在此，我们描述了基于两种不同基体（不含惰性集料的G1和含惰性石英集料的G2）制备新型磁性地质聚合物的过程，这两种基体中均含有两种重量浓度分别为6%和11%的商用SrFeO颗粒。对复合材料进行了表征，包括化学、结构、形态和力学测定以及磁性和电学测量。磁性研究表明，平均而言，SrFeO磁性颗粒在无机基体中能够相对较好地分散。通过在固化过程中于外部磁场作用下将高浓度的各向异性SrFeO颗粒嵌入地质聚合物中，复合材料样品的剩余磁化强度得到了大幅提高。这些新型复合材料表现出良好的力学性能（如抗压强度），高于报道的含有类似磁铁矿含量的高重量混凝土的力学性能。阻抗测量表明，电阻主要受基体化学成分控制，可用于评估地质聚合程度。
