Preparation of superhydrophobic surfaces with micro/nano alumina molds

Abstract

Superhydrophobic surface with hierarchical structures prepared by nanoimprinting using anodic porous alumina molds.

Fabrication and applications of stimuli‐responsive micro/nanopillar arrays

“…Owing to the high Young's modulus of Al, 122 AAO templates facilitate the imprinting of various polymeric nanostructures with fine resolution 123–125 . In particular, roll‐to‐roll nanoimprinting using AAO templates can produce high‐throughput nanoarrays (Figure 6(A–D)) 126 .…”

“…115,121 Owing to the high Young's modulus of Al, 122 AAO templates facilitate the imprinting of various polymeric nanostructures with fine resolution. [123][124][125] In particular, roll-to-roll nanoimprinting using AAO templates can produce high-throughput nanoarrays (Figure 6(A-D)). 126 To prevent crack formation in the curved AAO template, the AAO template was attached to a flexible PDMS plate after the removal of the Al substrate (Figure 6(A)).…”

Renewable Superhydrophobic Surfaces Prepared by Nanoimprinting Using Anodic Porous Alumina Molds

“…They depend strongly on geometrical surface structures and can be controlled by optimizing these surface structures. There have been numerous reports on the preparation of superhydrophobic surfaces based on the control of surface structures, including fractal surfaces, nanoporous surfaces, and petal-like hierarchical surfaces. − The problem with the hydrophobic surfaces based on the control of surface structures is that they easily deteriorate owing to mechanical damage or contamination of the surfaces. To expand the applicability of hydrophobicity by controlling surface structures, it is essential to resolve this problem.…”

Preparation of Ni micropillar arrays with high aspect ratios using anodic porous alumina template and their application to molds for imprinting

“…To form anodic porous alumina with a thickness of 50 mm on the surface of the Al substrate, the electropolished Al was anodized at a constant voltage of 40 V in 0.3 M oxalic acid at 16 C for 7.5 h. The resist mask on the surface of anodic porous alumina was formed through a printing process using a polydimethylsiloxane (PDMS) stamp with an ordered concave array on its surface. 17,18 The PDMS stamp was obtained through a molding process using a master pattern formed via electron beam lithography. The diameter and interval of concaves were 2 and 5 mm, respectively.…”

“…For the preparation of anodic porous alumina with patterned structures, selective etching using a thin polymer mask formed on the surface of anodic porous alumina and subsequent selective etching were employed. 17 In this process, the anisotropic etching of the porous structures of anodic porous alumina allows the formation of fine patterns with high aspect ratios. For the electrodeposition of a metal (Ni) into the concaves of the patterned alumina templates, the native oxide layer of Al at the bottom should be removed to ensure sufficient conductivity for electrodeposition.…”