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Preparation and characterization of cellulose nanocrystals (NCCs) from acid hydrolysis of huizache soluble grade cellulose (Acacia farnesiana L. Willd).
In this research, the production and characterization of cellulose nano crystals (NCCs), obtained from acid hydrolysis of soluble grade cellulose (α-cellulose) isolated from huizache wood (Acacia farnesiana L. Willd) was carried out. The NCCs were produced from controlled acid hydrolysis of high purity cellulose. The α-cellulose samples from huizache were subjected to controlled acid hydrolysis reactions with mineral acids such as sulfuric and hydrochloric acid. The acid hydrolysis of the cellulose samples was studied with each of the acids, in parallel; in order to generate various suspensions of nanoparticles that exhibit different surface morphologies and properties, derived from different hydrolysis conditions and the origin of the cellulose sample. The suspensions of nano crystals obtained were characterized by various analysis techniques, with which properties of interest such as particle size distribution (DLS), the morphology and size of the NCCs (AFM), residual surface charge of the nano particles (conductometric titrations) and chemical composition (FT-IR). The experimental parameters, especially the acid concentration, showed a greater significance on the properties of the particles hydrolyzed with H2SO4, while in the case of the NCCs obtained with HCl the statistically significant variables were concentration and temperature. Both acid hydrolysis procedures were followed to obtain suspensions of NCCs that differ in their properties.