Cellulose nanofibers are typically separated from lignocellulosic
plants, such as wood and agricultural crops,
using mechanical treatment [5]. Usually, lignin is also removed
from the plant cell wall prior to fibrillation using
chemical treatment [5–7]. Depending on the source and
separation method used, cellulose nanofibers are typically
20–40 nm in diameter and several micrometers long [3,8].