Nanocellulose was prepared from wood pulp via a one-pot oxidation reaction using only a highly concentrated solution of sodium hypochlorite pentahydrate (NaClO·5H₂O) and subsequent mechanical treatment. The concentration of NaClO in the solution was 22%, and the oxidation reaction times were 0.5, 2, and 6 h. The carboxy group content in the pulp increased with reaction time and reached 0.87 mmol/g after oxidation for 6 h. The oxidized pulp fibers were successfully refined down to nanocellulose by gentle mechanical disintegration such as ultrasonic homogenizer treatment. The obtained nanocellulose showed good colloidal stability in water because of the introduced carboxy groups, and the dispersion showed high optical transparency. Scanning probe microscopy showed that the nanocelluloses had an average height and length of 2.7–3.2 and 173–398 nm, respectively. Nuclear magnetic resonance spectroscopy analysis of the oxidized pulp suggested that NaClO oxidized the C2 and C3 hydroxy groups of the glucose units.

中文翻译：

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通过使用高浓度NaClO水溶液一锅法形成C2和C3羧酸盐基团来生产纳米纤维素

仅使用高浓度的次氯酸钠五水合物（NaClO·5H ₂O）和随后的机械处理。溶液中NaClO的浓度为22％，氧化反应时间为0.5、2和6 h。纸浆中的羧基含量随反应时间的增加而增加，并在氧化6小时后达到0.87 mmol / g。通过温和的机械崩解（例如超声均质器处理），可以将氧化后的纸浆纤维成功地精制为纳米纤维素。由于引入的羧基，所获得的纳米纤维素在水中显示出良好的胶体稳定性，并且分散体显示出高的光学透明性。扫描探针显微镜显示，纳米纤维素的平均高度和长度分别为2.7–3.2和173–398 nm。氧化纸浆的核磁共振波谱分析表明，NaClO氧化了葡萄糖单元的C2和C3羟基。