Shan Zhiqiang, Jia Xiaohua, Yang Jin, Wang Zhaofeng, Song Haojie
School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science & Technology, Xi'an 710021, PR China.
School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science & Technology, Xi'an 710021, PR China.
Carbohydr Polym. 2025 Jan 1;347:122744. doi: 10.1016/j.carbpol.2024.122744. Epub 2024 Sep 17.
Cellulose, one of nature's most abundant, clean, and sustainable resources, has often shown unsatisfactory results when used as bio-lubricant additives. Herein, nanocellulose (NC) from amorphous waste natural poplar was extracted using deep eutectic solvent encapsulation treatment and chlorine bleaching process. Subsequently, 1-hexadecyl-3-methylimidazolium bromide was integrated onto NC using a one-step hydrothermal treatment (high-temperature and high-pressure environment) to obtain ionic liquid crystal (ILC) functionalized products (named as ILC-NC). After ball-milling process and solid phase separation step, ILC-NC exhibits excellent dispersion stability and lubrication properties in the liquid phase (including water and vegetable oil). Based on the polar and colloidal activity properties of ILC, it can form an ordered molecular layer on NC surface and form a lubricating film-like structure, making NC smoother and sliding well. Compared to ILC/NC aqueous dispersion, ILC-NC reduces the coefficient of friction and wear rate on steel disk surface by 68.75 % and 74.07 %, respectively. The minimum coefficient of friction was further reduced to 0.032 as dispersing ILC-NC in sunflower oil, showing a reduction of 0.134 (77.91 %) compared to pure sunflower oil. Finally, the lubrication theoretical model calculation reveals the lubrication state of ILC-NC on the steel disk surface and proposes the lubrication mechanism.
纤维素是自然界中最丰富、清洁且可持续的资源之一，但作为生物润滑剂添加剂使用时，其效果往往不尽人意。在此，采用低共熔溶剂包封处理和氯漂工艺，从无定形废弃天然杨木中提取了纳米纤维素（NC）。随后，通过一步水热处理（高温高压环境）将1-十六烷基-3-甲基咪唑溴盐整合到NC上，以获得离子液晶（ILC）功能化产物（命名为ILC-NC）。经过球磨工艺和固相分离步骤后，ILC-NC在液相（包括水和植物油）中表现出优异的分散稳定性和润滑性能。基于ILC的极性和胶体活性特性，它可以在NC表面形成有序分子层并形成类似润滑膜的结构，使NC更加光滑且滑动良好。与ILC/NC水分散体相比，ILC-NC在钢盘表面的摩擦系数和磨损率分别降低了68.75%和74.07%。将ILC-NC分散在葵花籽油中时，最小摩擦系数进一步降至0.032，与纯葵花籽油相比降低了0.134（77.91%）。最后，润滑理论模型计算揭示了ILC-NC在钢盘表面的润滑状态并提出了润滑机制。
