Study on the Creation of Fine Periodic Structure on V-Shaped Groove with Short-Pulsed Laser
Ryohei Takase*1, Shuhei Kodama*2, Keita Shimada*1, Holger Mescheder*3, Kai Winands*3, Jan Riepe*3, Kristian Arntz*3, Masayoshi Mizutani*1,, and Tsunemoto Kuriyagawa*4
*1Department of Mechanical Systems Engineering, Graduate School of Engineering, Tohoku University
6-6-01 Aramaki Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8579, Japan
*2Department of Mechanical System Engineering, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan
*3Department of Non-conventional Manufacturing Processes and Technology Integration,
Fraunhofer Institute for Production Technology IPT, Aachen, Germany
*4Graduate School of Biomedical Engineering, Tohoku University, Sendai, Japan
Functional surface creation technologies have garnered increasing attention over the years. These technologies can provide various functions to a material by establishing a fine structure on the material surface and responding to the needs of industrial products with distinguished functions or high values. In addition, by creating a “composite fine structure,” which is composed of two kinds of structures with different scales, the enhancement of functions and emergence of new functionalities can be expected. Hence, our study combined a micrometer-scale V-shaped groove structure using an ultra-precision cutting and nanometer-scale ultra-fine periodic structure (LIPSS) using a short-pulsed laser. Then, we clarified the creation principle and studied the functionality of the structure, specifically, its wettability. As a result, it was found that optical behavior inside the V-shaped groove changed; therefore, the composite structure changed depending on the groove angle, laser polarization direction, and number of times of irradiation. In addition, it was found that the water wettability changed depending on the type of formed micro-nano composite structures. Moreover, the wettability could be controlled by depending on how the structure is used.
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