Development of bio-based wrinkled surfaces inspired by woods

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K05916
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Polymer/Textile materials
• Research Institution: Tottori University
• Principal Investigator: IZAWA Hironori 鳥取大学, 工学研究科, 助教 (50643235)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: リンクル / キトサン / 西洋ワサビ由来ペルオキシダーゼ / スキン層

Outline of Final Research Achievements

We developed a simple approach for surface wrinkling of chitosan films. In the method, chitosan film is immersed in a solution containing phenolic acids and subsequent horseradish peroxidase-catalyzed reaction produces a skin layer. Upon drying, wrinkles in the micron-scale were gradually form via inhomogeneous shrinking of the surface. In this project, we investigated mechanism of the wrinkling system.
We revealed that wrinkle size with this system is predominately determined by the hardness of the skin layer, and the hardness in turn can be controlled by varying both the molecular structure of the phenolic acid and the immersion temperature. The crosslinking structure in the skin is composed of ionic bonding between chitosan and an oligophenolic residue. In addition, we newly developed a novel surface wrinkling system based on the fabrication of a polyion complex skin layer inspired by the mechanism of the above wrinkling system.

Free Research Field

高分子化学、材料化学

Academic Significance and Societal Importance of the Research Achievements

乾燥を駆動力とするリンクル形成手法の基盤技術の開発に成功した。溶媒の蒸発をトリガーとするリンクル形成手法の報告例は乏しかったが、世界で初めてリンクルのサイズとスキン層の弾性率との系統的な知見が得られた。また、新たに開発したポリイオンコンプレックススキン層によるリンクル形成システムは、乾燥によって誘起されるリンクル表面が、極めて簡便に調製できることを証明した。これらの研究成果は、微細構造表面の開発研究に大きな影響を与えると期待される。