Simple fabrication method of flexible and translucent high-aspect ratio superhydrophobic polymer tube using a repeatable replication and nondestructive detachment process

Superhydrophobic tubes with excellent liquid transfer capability due to the drag reduction property have attracted considerable attention in recent years. However, there are several challenges in the fabrication of superhydrophobic tubes using previously reported methods. Herein, a simple method to fabricate superhydrophobic polydimethylsiloxane (PDMS) tube via a replication and detachment process using a superhydrophobic mold is reported. The fabricated tube is translucent and highly flexible owing to the good optical and mechanical properties of PDMS. The translucent and flexible tube with a high aspect ratio exhibited excellent superhydrophobicity without the need for additional chemical treatments. Significantly, the polymer replica can be separated spontaneously without damaging the mold, because of the nondestructive detachment process using swelling effect of PDMS. Thus, the replication can be repeated for fabricating superhydrophobic tubes using a single mold. Owing to the superior anti-wetting property, liquids can be transported better through the fabricated superhydrophobic tube than a normal tube. In addition, blood can be delivered without contaminating the tube. These distinct characteristics will extend the applicability of superhydrophobic tubes to various fields requiring productivity as well as optical and mechanical advantages, such as medical devices.