Experimental Investigation of the Relative Degree of Crystalline and Amorphous Properties of Cellulose Nanofibers Studied by Correlated Graphene-Quenching Raman Spectroscopy with Electrostatic Force Microscopy Technique
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This work aims to develop a new characterization method for comparing the relative degree of crystalline (well-ordered) and amorphous (disordered) characters of wood cellulose nanofibers (CNFs), which can be utilized for developing non-breakable films with high toughness and optically transparent properties. The method involves correlating Graphene Quenching Raman Spectroscopy (GQRS) and Electrostatic Force Microscopy (EFM) results to evaluate the degree of relative crystalline or amorphous domains in CNFs level. The I(Amorphous)/I(Crystalline) value from GQRS is used for quantitatively evaluating the degree of relative crystalline or amorphous domains, while the EFM amplitude image is used to distinguish between relatively crystalline and amorphous CNFs based on their relative hydrophobic and hydrophilic properties, respectively. This work discovered an anti-correlation phenomenon between I(Amorphous)/I(Crystalline) values and the corresponding EFM tip amplitude results.