Uetani Kojiro, Koga Hirotaka, Nogi Masaya
The Institute of Scientific and Industrial Research, Osaka University, Mihogaoka 8-1, Ibaraki-shi, Osaka 567-0047, Japan.
Nanomaterials (Basel). 2020 May 18;10(5):958. doi: 10.3390/nano10050958.
It is essential to build multiaxis oriented nanocellulose films in the plane for developing thermal or optical management films. However, using conventional orientation techniques, it is difficult to align nanocelluloses in multiple directions within the plane of single films rather than in the thickness direction like the chiral nematic structure. In this study, we developed the liquid-phase three-dimensional (3D) patterning technique by combining wet spinning and 3D printing. Using this technique, we produced a checkered film with multiaxis oriented nanocelluloses. This film showed similar retardation levels, but with orthogonal molecular axis orientations in each checkered domain as programmed. The thermal transport was enhanced in the domain with the oriented pattern parallel to the heat flow. This liquid-phase 3D patterning technique could pave the way for bottom-up design of differently aligned nanocellulose films to develop sophisticated optical and thermal materials.
为了开发热管理或光学管理薄膜，在平面内构建多轴取向的纳米纤维素薄膜至关重要。然而，使用传统的取向技术，很难在单膜平面内将纳米纤维素沿多个方向排列，而不是像手性向列结构那样在厚度方向排列。在本研究中，我们通过结合湿法纺丝和3D打印开发了液相三维（3D）图案化技术。使用该技术，我们制备了具有多轴取向纳米纤维素的方格薄膜。该薄膜显示出相似的相位延迟水平，但在每个方格区域中具有按程序设置的正交分子轴取向。在与热流平行的取向图案区域中，热传输得到了增强。这种液相3D图案化技术可为自下而上设计不同排列的纳米纤维素薄膜以开发复杂的光学和热学材料铺平道路。
