Anisotropic Frictional Properties Induced by Cellulose Nanofibril Assembly.
Anisotropic Frictional Properties Induced by Cellulose Nanofibril Assembly.
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DOI：
10.1021/acs.biomac.3c00072
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发表时间：
2023-04
影响因子：
6.2
通讯作者：
Koichiro Ishida;T. Kondo
中科院分区：
文献类型：
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作者：
Koichiro Ishida;T. Kondo
几何各向异性纳米材料的排列调节其功能。棒状纤维素纳米晶体（CNCs）的自有序性导致液晶的形成，并且CNCs的有序性表现出独特的光学性质。天然纤维素纳米纤丝（CNF）被认为是定向的，并且因此定向与它们的功能（诸如它们的机械强度和细胞响应）相关。相比之下，人工粉碎的高纵横比的CNF的有序性受到其长纤维形状的限制。在这里，我们提出了一个简单的制造方法，非单轴，指纹般的排列的CNFs使用的朗缪尔-布洛杰特技术。所得到的朗缪尔-布洛杰特薄膜的CNFs表现出各向异性的摩擦性能取决于取向方向。这种用于制造CNF纳米薄膜的方法预计将用于具有所需结构-功能相关性的新型表面设计，其为材料表面提供各向异性表面特性。
The alignment of geometrically anisotropic nanomaterials regulates their functions. Self-ordering of rod-like cellulose nanocrystals (CNCs) results in liquid-crystal formation, and the ordering of the CNCs exhibits unique optical properties. Native cellulose nanofibrils (CNFs) are considered to be oriented, and thus the orientation is correlated with their functions, such as their mechanical strength and cell responses. In contrast, the ordering of artificially pulverized CNFs with high aspect ratios is restricted by their long fibrous shape. Here, we propose a facile fabrication method for non-uniaxial, fingerprint-like alignment of CNFs using the Langmuir-Blodgett technique. The obtained Langmuir-Blodgett films of CNFs exhibited anisotropic frictional properties depending on the orientation direction. This process for fabrication of CNF ultrathin films is expected to be used for novel surface design with desired structure-function correlations, which provides anisotropic surface properties to the material surface.