Some authors have measured the dimensions of CN extracted from different agricultural residues [79]. CNF produced from wheat straw and soy hulls have diameters of 1080 nm and 20120 nm [79] that are higher than those of CNF from wood. However, CNF from sisal [160,271], carrots [272], and Luffa cylindrical [273] have smaller diameters, of 2065, 336, and 55615 nm, respectively. Therefore, it is difficult to draw a clear overall picture, since each source is specific and individual, and the mechanical treatment differs from one study to another.