Water Repellency Control of Oxygen-Free Copper Surface by Diamond-Cut Micro Grooves

Abstract

Improving water repellency of a metal surface is required in a wide range of industrial applications. In this study, the water repellency control of an oxygen-free copper surface was attempted by generating micro V grooves on the surface by using ultraprecision cutting technology. The results showed that the maximum contact angle of a water drop on a micro V-grooved surface could be as high as approximately twice that of a flat surface. The contact angle depended strongly on the direction, depth, pitch of the grooves, and burr formation at the edges of the micro grooves. A method for controlling burr formation was proposed.

Ultraprecision Micro Grooving on Brass for Surface Wettability Control

“…9(a) shows micro grooves with significant burr formation. In order to suppress burr formation, the slanted tool feed method was proposed by the present authors [7]. Fig.…”

Controlling droplet shape and water repellency by Micro-Structured Precision Surface

“…Controlling droplet shape and water repellency are the technology needed in many fields, and it is expected to be applied to a wide variety of products by increasing water and dirt resistance (1) . Water repellency of solid surfaces is caused by chemical or structural effects.…”

Fabrication of an Anisotropic Superhydrophobic Polymer Surface Using Compression Molding and Dip Coating

“…In addition, the contact angle hysteresis and wetting transition on anisotropic superhydrophobic surfaces shows unique behaviors according to the directions, and they are clearly different from the behaviors in isotropic wetting surfaces [14][15][16][17]. The lines or grooves have been fabricated by lithography, embossing, imprinting, laser machining, the formation of wrinkles via mechanical compressing, or other fabrication methods [13,[18][19][20][21][22][23][24][25][26][27][28]. For mass production of an anisotropic wetting surface, replication of patterns using a mold seems to be suitable, but many studies have used poly(methyl methacrylate) (PDMS), which has a relatively long curing time and limited reusability of the mold [13,[18][19][20][21], and molds with an uncontrollable surface roughness and side wall slope by laser machining and wrinkle formation, which does not show a clear pattern shape [7][8][9][10][11]13].…”