Fig. 1 Development concept of nanocellulose oriented film by liquid phase 3D patterning technology
Figure 2 Developed nanocellulose multi-axis oriented film
Osaka Univ.: Arrangement/assembly of nanocellulose freely: Development of liquid phase 3D patterning
Osaka University;
Announced “Liquid-phase 3D patterning technology that integrates nanocellulose into a flexible structure while arranging”.
Developed a multi-axis oriented film in which nanocellulose is arranged in multiple directions.
We were able to confirm the controllability of optical phase difference, slow axis, and heat transfer.
Application fields:
Next generation/optical functional materials and paper electronics/higher performance will be used.
Thermal control for energy saving,
A film that allows light management,
Paper materials that can be managed by light,
RESOU
https://resou.osaka-u.ac.jp/ja/research/2020/20200520_2
Checkered Films of Multiaxis Oriented Nanocelluloses by Liquid-Phase Three-Dimensional Patterning
May 2020Nanomaterials 10(5):958
DOI: 10.3390/nano10050958
Authors:
Kojiro Uetani
Hirotaka Koga at Osaka University
Masaya Nogi
Abstract and Figures
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.