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Preparation of core-shell C@TiO 2 composite microspheres with wrinkled morphology and its microwave absorption

Journal of Colloid and Interface Science, ISSN: 0021-9797, Vol: 607, Issue: Pt 2, Page: 1036-1049
2022
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Article Description

In this work, we successfully synthesize the core-shell structure carbon@titanium dioxide (C@TiO 2 ) composite microspheres with wrinkled surface through a three-step method and build up the relationship between the TiO 2 layer thickness and the microwave absorption property. The absorbing mechanism of the novel microsphere is revealed. Interface polymerization is applied for preparation of wrinkled poly glycidyl methacrylate/divinylbenzene polymer microspheres (PGMA/PDVB); Then, TiO 2 layer is controllably coated on the surface of PGMA/PDVB microspheres by hydrolysis of tetrabutyl titanate (TBT); C@TiO 2 composite microspheres are obtained by vacuum carbonization with PGMA/PDVB@TiO 2 microspheres as the precursor. TiO 2 layer thickness on the surface of C@TiO 2 composite microspheres can be effectively adjusted by controlling the amount of TBT. When the amount of TBT is 0.75 mL, C@TiO 2 composite microspheres exhibit the outstanding electromagnetic loss performance. The maximum reflection loss value (RLmax) reaches -49.21 dB at the thickness of 2 mm, corresponding effective absorption bandwidth is 5.27 GHz. The maximum effective absorption bandwidth is 5.5 GHz at 2.2 mm. The results show that the introduction of TiO 2 can regulate electromagnetic parameters and enhance interface polarization ability. Meanwhile, the surface wrinkle structure offers more opportunities for multiple reflections of electromagnetic and introduces a large number of defective skeleton structure. The synergy of multiple advantages makes the absorbing performance of C@TiO 2 composite microspheres significantly improved. This work plays a guiding role for the composition and the structure optimization of existing microwave absorbers.

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