Fig. 3From: Eco-friendly cellulose-based hydrogels derived from wastepapers as a controlled-release fertilizerFESEM images of a cellulose fibres, and ECH-crosslinked cellulose hydrogels of varying cellulose concentrations and 1.75% (w/v) CMC: b C1, c C2, d C3, e C4 and f C5 cellulose hydrogels. Magnification × 1000Back to article page