Abstract:In this paper, the preparation process of the nanocrystalline whiskers was optimized, and the morphology, structure and physicochemical properties of the whiskers were characterized. The yield of cellulose nanowhisker was taken as the index, and the one-way experiment was carried out with the feed-liquid ratio, the hydrolysis time and the hydrolysis temperature as the investigating factors, and then the preparation process was optimized by the Box-Behnken response surface experiment. The optimum extraction conditions were determined as 5:100 g/mL, 3.5 h, 49 ℃, and 65.61% for the yield of pedunculated cellulose nanowhisker. Under these conditions, the yield of nanowhisker was 65.61%. The results of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed that the cellulose was transformed into short rod-like nanostructures by sulfuric acid hydrolysis. The results of X-ray diffraction and infrared data showed that the nanocellulose whisker was successfully prepared and the basic chemical structure of cellulose was still maintained. Particle size analysis and PDI value showed that the higher the degree of hydrolysis, the smaller the particle size of the prepared whisker. The zeta potential analysis showed that the zeta potential of the prepared whisker suspension was larger, which proved that the surface state and stability of the nanoparticles were better. Thermal analysis shows that the prepared nanocellulose whisker has good thermal stability. The preparation process is common and efficient, and proved to be suitable for stabilizing Pickering emulsion, which can not only make full use of lotus root by-product resources, but also contribute to the industry"s loss and increase and sustainable development.
