Institute of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8, Saiwaicho, Fuchu, Tokyo 183-8509, Japan.
Forestry and Forest Products Research Institute (FFPRI), Matsunosato1, Tsukuba, Ibaraki 305-8687, Japan.
Biomacromolecules. 2024 Sep 9;25(9):5909-5917. doi: 10.1021/acs.biomac.4c00581. Epub 2024 Aug 19.
The present paper describes a downsizing mechanism of an aqueous counter collision (ACC) process that enables the rapid preparation of cellulose nanofibrils (CNFs) as an aqueous dispersion solely by impinging a pair of water jets containing the raw materials. Extensive studies have revealed that the resulting CNFs by ACC have amphiphilic fiber surfaces, in which two kinds of faces with different natures are present along the entire fiber axis. They therefore have superior adsorption to surfaces of various conventional polymer plastics. These characteristic adsorption behaviors, which are totally different from those for other CNFs prepared by other means, are attributable to their hydrophobic surfaces. In the present study, high-resolution microscopy, including atomic force microscopy, confocal laser scanning microscopy, and scanning electron microscopy with broad argon ion beam milling, was used to determine how the emergence of such hydrophobic characteristics in a nanofibril face occurs in relation to the ACC nanopulverization mechanism due to the collision of the pair of water jets.
本文描述了一种水性对撞（ACC）工艺的减容机制，该机制可通过撞击一对含有原料的水射流，快速制备纤维素纳米纤维（CNF）作为水性分散体。广泛的研究表明，通过 ACC 得到的 CNF 具有两亲性纤维表面，在整个纤维轴上存在两种具有不同性质的面。因此，它们对各种常规聚合物塑料的表面具有优异的吸附性。这些与通过其他方法制备的其他 CNF 完全不同的特征吸附行为归因于其疏水性表面。在本研究中，使用高分辨率显微镜，包括原子力显微镜、共聚焦激光扫描显微镜和带有宽氩离子束铣削的扫描电子显微镜，以确定在对撞水射流的碰撞作用下，由于 ACC 纳米粉碎机制的作用，纳米纤维表面出现这种疏水性特征的方式。
