Robust Waterborne Superhydrophobic Coatings with Reinforced Composite Interfaces

Abstract

Waterborne superhydrophobic coatings have attracted tremendous attention recently, but their practical applications are severely limited by hydrophobic instability and poor mechanical durability. Herein, a novel robust waterborne PTFE-CP&MgO-AOP superhydrophobic coating was successfully fabricated by reinforcing composite interfaces. Combined with the self-polymerization of dopamine and the in situ grown MgO, CNTs-polydopamine&MgO (CP&MgO) particles with improved interfacial compatibility were obtained. Through the cross-linking and hydrogen bonding interactions, phosphate networks (CP&MgO-AOP) with the aluminum orthophosphate (AOP) binder were formed during dehydration polymerization. The phosphate networks not only enhanced the interfacial interaction among CP&MgO to form coral-like structures but also strengthened the interfacial binding force between the waterborne polytetrafluoroethylene (PTFE) coating and the substrate. With the enhanced composite interfacial strength, the waterborne PTFE-CP&MgO-AOP coating exhibited excellent wear-resistance, which can withstand more than 1.27 × 105 abrasion cycles. Moreover, the chemical bonding between the functional groups of phosphate networks and metal substrate improved the adhesion strength from grade 5 to 1. Furthermore, the prepared coating surface with the reticular/coral-like composite structures can lock the stable gas layer to maintain excellent hydrophobic stability, even under the conditions of strong acidic/alkaline, high-temperature, xenon lamp irradiation, and mechanical wear. Thus, this study is expected to open new insights into interfacial enhancement of robust waterborne superhydrophobic coatings.

Engineering Bimetallic NiFe‐Based Hydroxides/Selenides Heterostructure Nanosheet Arrays for Highly‐Efficient Oxygen Evolution Reaction

“…The structure models with different oxygen‐contained intermediates as well as the Gibbs free energy profiles of different steps for NiFeOOH and NiFeOOH/(Ni, Fe)Se 2 are illustrated in Figure 6c,d; and Figure S14 (Supporting Information), where the Ni atom is considered as the active site according to the previous works. [ 59–61 ] For NiFeOOH, the rate‐determining step is the second step from *OH to *O, with an overpotential of 1.1 V. However, for the heterostructure, the rate‐determining step is changed into the third step from *O to *OOH, and the overpotential is reduced to 0.98 V, implying a faster electrochemical kinetics. Additionally, the electrical conductivity of the catalysts is also an important factor to influence their catalytic activities, which can be evaluated by using the total densities of states (DOS) of NiFeOOH/(Ni, Fe)Se 2 and NiFeOOH, as shown in Figure S15 (Supporting Information).…”

Fiber‐Shaped Electronic Devices

“…Given the high mechanical strength and the high electrical conductivity, stainless steel fibers were initially utilized as the core substrate for the fabrication of wearable electronics. [ 17 ] However, stainless steel fibers show poor softness and flexibility, [ 18 ] which significantly limit their weavability into textiles and stretchability for practical applications. Woven stainless steel filter meshes were found to be stretchable when being tailored along a direction of 45° to its weft or the warp.…”

“…demonstrated red, green, and blue electrochromic fibers by utilizing commercially available stainless steel wires (SSWs) and electrochromic polymers. [ 17 ] As shown in Figure 32 a, various electrochromic polymers (i.e., poly(3,4‐ethylenedioxythiophene), poly(3‐methylthiophene), and poly(2,5‐dimethoxyaniline)) were electropolymerised on the surface of the core SSWs, which served as working electrode in the fiber‐shaped electrochromic device. Next, the core SSWs were dipped into the polymer gel electrolyte and dried at ambient temperature.…”

“…Reproduced with permission. [ 17 ] Copyright 2014, American Chemical Society. c) Schematic illustration of the structure and color display function of the electrochromic, wearable fiber‐shaped supercapacitor.…”

Facile synthesis of highly porous hyper‐cross‐linked polymer for light hydrocarbon separation

“…For petrochemical industry, light hydrocarbon separation is essential, and offers a variety of necessities related to our life. [ 1–3 ] Currently, the Traditional purification method of distillation is often employed to separate light hydrocarbons under low‐temperature and high‐pressure conditions. [ 4–6 ] However, this purification process is generally associated with huge energy consumption, which accelerates the process of depleting global energy resources and exacerbates environmental pollution problems.…”