Silicate–CoNi–carbon triple shell sandwich structured composite hollow microspheres with low density boosted microwave absorption and high mechanical strengthElectronic supplementary information (ESI) available: Structure and physical properties of different samples, comparison of the EMW absorption, densities and mechanical strengths of recently reported similar hollow spherical absorbents, schematic illustration of the formation process of the CHMs and their polymer matrix composites, SEM images of a broken CHM and the silicate–CoNi–carbon precursor CHMs prepared via the Stöber method, frequency-dependence of power balance and absorption mechanisms of different CHM samples; Raman spectra of the triple shell CHMs. See DOI: 10.1039/d0tc05258b

Silicate–CoNi–carbon triple shell sandwich structured composite hollow microspheres with low density boosted microwave absorption and high mechanical strengthElectronic supplementary information (ESI) available: Structure and physical properties of different samples, comparison of the EMW absorption, densities and mechanical strengths of recently reported similar hollow spherical absorbents, schematic illustration of the formation process of the CHMs and their polymer matrix composites, SEM images of a broken CHM and the silicate–CoNi–carbon precursor CHMs prepared via the Stöber method, frequency-dependence of power balance and absorption mechanisms of different CHM samples; Raman spectra of the triple shell CHMs. See DOI: 10.1039/d0tc05258b