Phase-change composites for bimodal solar/electromagnetic energy storage based on magnetite-modified cellulose microfibers

摘要

Fe3O4-modified cellulose microfibers containing 7, 16, and 31 wt% of magnetite were prepared via co -precipitation of Fe2+ and Fe3+ salts. The magnetic phase-change composites were synthesized by adsorption of lauric acid onto the modified fibers with the highest saturation magnetization (23 emu/g) and magnetic-to -thermal conversion. The resulted composites demonstrated the saturation magnetization of 11.2 emu/g and latent heat storage capacity of 90 J/g corresponding to the loading efficiency of lauric acid of 49-51 wt%. The IR -imaging revealed the efficient accumulation of latent heat in the phase-change composite under the simulated sunlight and high frequency alternating magnetic field along with the excellent shape stability of the composites during the melting of lauric acid.