新穎材料農業：友善環境農業新穎材料研發與安全評估【土環系薛涵宇助理教授】
論文篇名 英文：Macroscopic Geometry-Dominated Orientation of Symmetric Microwrinkle Patterns
中文：濕式釋放誘導高有序表面皺褶型態生成
期刊名稱 ACS Appl. Mater. Interfaces
發表年份,卷數,起迄頁數 2019, 11, 23741-23749
作者 H.-Y. Hsueh*, M.-S. Chen, C.-Y. Liaw, Y.-C. Chen, A. J. Crosby*
DOI 10.1021/acsami.9b05264
中文摘要 本研究建構於仿生(biomimetic)的概念，結合材料濕式製程，開發一新穎皺褶製備技術，可得到大面積且具有光子晶體特性的表面皺摺結構。皺褶型態主要結構由雙層材料組成：軟質材料上披覆一層硬質材料，當外在環境改變導致內外兩層材料應力不平衡時，皺褶型態因而產生，過去製備皺褶的方法多為乾式製程：高真空下蒸鍍金屬於高分子基材上，但乾式製程成本高且無法製備大範圍皺褶型態，不利工業化應用。本次研究成功開發一新式濕式製程製備大面積且高有序的皺褶結構，利用調整溶液濃度與PDMS交聯程度，探討對皺褶的影響，包含波長與型態。實驗結果證明，本製程利用多層次濕式塗佈製備不同材料塗層，於應力釋放過程中自發性形成高有序具光子晶體特性的皺摺結構，此濕式皺褶製備技術可用於開發不同材料的皺褶型態，如碳材與金，做為軟性電子與催化的應用。
英文摘要 Orientated wrinkle patterns with controlled microarchitectures are highly attractive because of their potential and broad application in technologies ranging from flexible electronic devices to smart windows. Here, we demonstrate a macroscopic, geometry-dominated strategy to fabricate symmetric microwrinkles with precisely controllable pattern dimensions and orientations through a dynamic interfacial release process. The release-induced approach is based on the release of multilayer elastomer composites from polymeric sacrificial layers in solutions combined with crosslinking-induced contraction of the elastomer substrates. Crosslinking-induced contraction provides the driving force for developing and stabilizing surface wrinkle formation, whereas the polymeric sacrificial layer provides a mild and simultaneous release process to form orientated wrinkles through kinetic control of local strain development. The macroscopic shape of the composite controls release kinetics, hence strain history, leading to the generation of photonic reflective surfaces. Moreover, stable wrinkles fabricated from various materials including metals, ceramics, and carbons can be achieved. This versatile, mold-free, and cost-effective platform technology demonstrates how global strain distributions can be harnessed through kinetics to drive local pattern development.