Table 2.

Comparison of various nanofibrillated cellulose (NFC) drying approaches [58,59,60].

Name	Method	Particle Size	Advantages	Disadvantages
Freeze-drying	Freezing of CNF suspension at −65 ℃ then lyophilisation	μm to mm and nanosize thickness	One well-established nanodimension	Expensive agglomeration
Supercritical drying	Dehydrating the NFC suspension and replacing the solvent with L(CO2)	Nanosize	Dimensions stay in nanosize	Expensive and complicated method.
Spray drying	Concentrating and pumping the liquid then, dehydrating by hot gas	7.48 μm	Controllable size and not expensive	Agglomeration
Oven drying	Put the suspension of NFC inside the oven at 105 ℃ for 24 h.	>100 μm or even mm	Well established for the industry	Loose of nano-D, Bulk material generation