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(a) Transmission electron microscope (TEM) image of TOUS-CNFs (scale bar: 500 nm); (b) Qualitative rheological behaviour of TOUS-CNFs aqueous suspensions at different CNF concentrations (i.e., 0.5, 1 and 2% w/v); (c) example of a cubic-shape TOUS-CNFs/Ca2+ hydrogel C1 (scale bar: 1 cm); (d) extrusion of TOUS-CNFs aqueous dispersion (2% w/v) into Ca2+ (100 mM) aqueous solution (indigo dye used to improve the visualization).
