Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 744, Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.
Carbohydr Polym. 2021 Jun 1;261:117845. doi: 10.1016/j.carbpol.2021.117845. Epub 2021 Feb 26.
The self-organization of nano-sized fibrous building blocks is essential for the construction of biomimetic architectonics and hierarchically constructed bio-based materials. The localization of hydrophobic moieties on the surfaces of such nanofibrils is key to hierarchical assembly in aqueous systems. In this study, unique self-assembling fibrous building blocks comprising amphiphilic cellulose nanofibrils (CNFs) were prepared by aqueous counter collision (ACC). The purpose of the study was to control the surface properties of ACC-CNFs by selectively acetylating their surfaces at the oil/water interfaces of a Pickering emulsion. Localized interfacial reactions occurred when the ACC-CNFs were adsorbed onto the surfaces of oil droplets containing the reaction reagents. Such acetylation reactions were achieved whilst maintaining the crystallinity and fibrous morphology of the original CNFs. The surfaces of films cast from the acetylated ACC-CNFs described herein had unique self-aggregation properties that contrasted markedly with those of films cast from acetylated ACC-CNFs prepared in homogenous dispersions.
纳米纤维状构建块的自组织对于仿生结构和分级构建的基于生物的材料的构建至关重要。在这些纳米纤维的表面上定位疏水性部分是在水相系统中进行分级组装的关键。在这项研究中，通过水相对撞（ACC）制备了包含两亲性纤维素纳米纤维（CNF）的独特自组装纤维状构建块。研究的目的是通过在皮克林乳液的油水界面处选择性地乙酰化其表面来控制 ACC-CNF 的表面性质。当 ACC-CNF 被吸附到含有反应试剂的油滴表面上时，会发生局部界面反应。在保持原始 CNF 的结晶度和纤维形态的同时，实现了这种乙酰化反应。本文中所描述的由乙酰化 ACC-CNF 铸造的薄膜的表面具有独特的自聚集特性，与在均相分散体中制备的乙酰化 ACC-CNF 铸造的薄膜的特性形成鲜明对比。
