Novel Magnetic Inorganic Composites: Synthesis and Characterization

Polymers

Federico Zorzi¹  Roberta Bertani²  Paolo Sgarbossa²  Daniele Desideri²  Mirto Mozzon²  Daniele Pavarin²  Federico Spizzo³  Lucia Del Bianco³  Marco Natali⁴  Sergio Tamburini⁴ 

[1] CEASC, Via G. Jappelli 1/A, 35121 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;Department of Physics and Earth Science, Polo Scientifico Tecnologico, University of Ferrara, Via G. Saragat 1, 44122 Ferrara, Italy;ICMATE, CNR, Corso Stati Uniti 4, 35127 Padova, Italy;

关键词: magnetic geopolymer composites;    SrFe₁₂O₁₉ particles;    morphological characterization;    magnetic properties;    impedance measurements;   

DOI  :  10.3390/polym13081284

来源: DOAJ

【 摘 要 】

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 SrFe₁₂O₁₉ 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 SrFe₁₂O₁₉ 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 SrFe₁₂O₁₉ 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.

【 授权许可】

Unknown