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Load displacement curves of cellulose paper samples in fracture toughness test, for various mean diameters of cellulose fiber. (A) 11 nm, (B) 28 nm, and (C) 27 μm. (D) Measured fracture toughness of cellulose paper as a function of mean diameter of the cellulose fibers, which clearly shows a scaling law of the smaller, the tougher.
