Environmental stimuli-responsive self-repairing waterbased superhydrophobic coatings

Abstract

Superhydrophobic coatings have received great attention over the past decades because of their specific performances, but most of them may lose their superhydrophobicity under harsh conditions especially in outdoor applications. In this paper, UV and pH dual stimuli-responsive self-repairing waterbased superhydrophobic coatings were prepared based on TiO 2 with photocatalysis and pH-responsive microcapsules, which were durable against UV irradiation and chemically stable in contact with alkaline or acidic aqueous solutions. These coatings are an environment-friendly waterborne system and could be easily coated on various substrates. What is more, they can restore their superhydrophobicity and self-cleaning ability under UV light even after mechanically damaged or contaminated with organics.Moreover, this superhydrophobic coating was immersed into 5 wt% NaCl aqueous solutions for 24 h or underwent ten icing/melting cycles, their surfaces could also recover the superhydrophobicity under pH or UV stimuli.

Superhydrophobic Surfaces with pH-Induced Switchable Wettability for Oil–Water Separation

“…The N 1s peak was only observed at 399.1 eV (Figure 6d), which was due to the deprotonation of PDMAEMA. 30−32 In terms of atomic content, the N atom content of the modified paper without the acid/alkali treatment was 0.11%. After the acid treatment, the N atom content on the surface of the paper increased to 0.55%.…”

Self‐Healing Superhydrophobic Surfaces: Healing Principles and Applications

“…The obtained superhydrophobic surface demonstrated durable anti‐icing properties even after 60 cycles of icing‐melting processes (Figure 16d–f), indicating a superior long lifetime than other reported anti‐icing coatings. [ 53 ]…”

Smart Nanocoating (Metal oxide and Composite) and its surface functionalization for Environmental Remediation

“…FAS-TiO 2 /PDMS superhydrophobic sandpaper surface (FTPSS) exhibit excellent self-cleaning and anti-snow/anti-icing performance even after 50 abrasion cycles with sandpaper and prevented snow and ice from adhering to the substrate (Qing et al 2019). K. Chen et al have reported the UV and pH dual stimuli-responsive self-repairing water-based superhydrophobic TiO 2 coatings which were prepared by spray process using perfluorooctyltriethoxysilane (FAS13) with WCA of 155.3 (Chen et al 2017). S. Liu et al have fabricated polydopamine and TiO 2 coatings on sand surfaces and subsequent hydrophobic modification (WCA~153 ) with low surface energy material (Liu et al 2019).…”