Cellulose nanocrystals (CNCs) were extracted from pineapple peel cellulose by traditional sulfuric acid hydrolysis method.The effects of sulfuric acid solution concentration (58%, 61%, and 64%, mass fraction) on particle size, morphology, potential, thermal stability, and stable Pickering emulsion properties of the prepared CNCs (CNCs-58%, CNCs-61%, and CNCs-64%) were investigated.Results showed that with the increase of sulfuric acid solution concentration, the diameter and length of CNCs decreased gradually with increased uniformity, and the absolute potential increased gradually (-33.5 mV, -43.6 mV, and -45.7 mV), but the thermal stability decreased.Compared with CNCs-58%, CNCs-61% and CNCs-64% showed better stable Pickering emulsion properties, showing a smaller droplet size, better storage stability, and a relatively larger absolute value of potential.However, at low CNCs concentration (0.2%, mass fraction), the degree of water evolution of CNCs-64% stabilized emulsion was relatively high, which was related to the morphology of CNCs.With the increase in CNCs concentration, the water evolution degree of emulsion decreased significantly.This study provides a reference for the preparation of CNCs from fruit and vegetable peel cellulose hydrolyzed by sulfuric acid and its application in Pickering emulsions.
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