Generation of periodic surface wrinkles using a single layer resin by a repetitive dividing volume (RDV) technique

Wrinkle structure can be utilized in various research fields, and, in particular, it has special characteristics when used in applications of heat transfer: a wrinkly surface promotes turbulent flow and increases surface area. However, the generation of microscale wrinkle structures in a large-scale area is still challenging. A number of studies have focused on the realization of wrinkles in micro-scale. However, most of the processes developed to date are using the mechanical bucking instability, and they require high precision equipment and are costly. So, there are some limitations to generate wrinkles over a large area. In this study, we propose a novel essential method referred to as a repetitive dividing volume (RDV) process to fabricate a wrinkle structure in a relatively easy manner. Through this work, micro-corrugate structures are successfully generated and the process parameters of RDV are identified. We believe that a large-scaled wrinkling film can be fabricated by connecting the proposed RDV and step-and-repeat process.

Graphical AbstractIn this study, we propose a novel essential method referred to as a repetitive dividing volume (RDV) process to fabricate a wrinkle structure in a large-scale area. Micro-corrugate structures are successfully generated on a single layer of resin without the aid of mechanical buckling instability and the process parameters of RDV are identified. We believe that a largescaled wrinkling film can be fabricated by connecting the proposed RDV and step-and-repeat process.Figure optionsDownload as PowerPoint slideHighlights
► We proposed an essential fabrication process for realizing large-scale microwrinkles.
► Wrinkle is generated on a single resin layer without using mechanical instability.
► We observed the variation of wrinkle shape by the parametric study of RDV.
► Microwrinkles having 800 nm height and 4–5 μm width were fabricated.
► The wrinkling mechanism of RDV was explained.