title: Ultra-Durable and Transparent Self-Cleaning Surfaces by Large-Scale Self-Assembly of Hierarchical Interpenetrated Polymer Networks.
abstract: In nature, durable self-cleaning surfaces such as the Lotus leaf rely on the multiscale architecture and cohesive regenerative properties of organic tissue. Real-world impact of synthetic replicas has been limited by the poor mechanical and chemical stability of the ultrafine hierarchical textures required for attaining a highly dewetting superhydrophobic state. Here, we present the low-cost synthesis of large-scale ultradurable superhydrophobic coatings by rapid template-free micronano texturing of interpenetrated polymer networks (IPNs). A highly transparent texture of soft yielding marshmallow-like pillars with an ultralow surface energy is obtained by sequential spraying of a novel polyurethane-acrylic colloidal suspension and a superhydrophobic nanoparticle solution. The resulting coatings demonstrate outstanding antiabrasion resistance, maintaining superhydrophobic water contact angles and a pristine lotus effect with sliding angles of below 10° for up to 120 continuous abrasion cycles. Furthermore, they also have excellent chemical- and photostability, preserving the initial performance upon more than 50 h exposure to intense UVC light (254 nm, 3.3 mW cm(-2)), 24 h of oil contamination, and highly acidic conditions (1 M HCl). This sprayable polyurethane-acrylic colloidal suspension and surface texture provide a rapid and low-cost approach for the substrate-independent fabrication of ultradurable transparent self-cleaning surfaces with superior abrasion, chemical, and UV-resistance.
authors.affiliation: Nanotechnology Research Laboratory, Research School of Engineering, ‡Research School of Engineering, and §Laboratory of Advanced Biomaterials, Research School of Engineering, The Australian National University , Canberra ACT 2601, Australia.
authors.forename: William S Y
authors.initials: WS
authors.lastname: Wong
authors.affiliation: Nanotechnology Research Laboratory, Research School of Engineering, ‡Research School of Engineering, and §Laboratory of Advanced Biomaterials, Research School of Engineering, The Australian National University , Canberra ACT 2601, Australia.
authors.forename: Zbigniew H
authors.initials: ZH
authors.lastname: Stachurski
authors.affiliation: Nanotechnology Research Laboratory, Research School of Engineering, ‡Research School of Engineering, and §Laboratory of Advanced Biomaterials, Research School of Engineering, The Australian National University , Canberra ACT 2601, Australia.
authors.forename: David R
authors.initials: DR
authors.lastname: Nisbet
authors.affiliation: Nanotechnology Research Laboratory, Research School of Engineering, ‡Research School of Engineering, and §Laboratory of Advanced Biomaterials, Research School of Engineering, The Australian National University , Canberra ACT 2601, Australia.
authors.forename: Antonio
authors.initials: A
authors.lastname: Tricoli
keywords: robust hierarchical nanostructures; self-cleaning; sprayable interpenetrated polymer network; ultra-durable; ultrahydrophobic