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(a) Bilayered solar absorber aerogel comprising carbon nanotubes atop cellulose nanofibers. Reproduced with permission from ref (318). Copyright 2018 American Chemical Society. (b) Photograph of cellulose–magnetite mixtures for solar absorption, before and after magnetic stirring (scale bar: 1 cm). Reproduced with permission from ref (320). Copyright 2021 American Chemical Society.
