Acid and Alkaline Dual Stimuli-Responsive Mechanized Hollow Mesoporous Silica Nanoparticles as Smart Nanocontainers for Intelligent Anticorrosion Coatings

Abstract

The present paper introduces an intelligent anticorrosion coating, based on the mechanized hollow mesoporous silica nanoparticles (HMSs) as smart nanocontainers implanted into the self-assembled nanophase particles (SNAP) coating. As the key component, smart nanocontainers assembled by installing supramolecular nanovalves in the form of the bistable pseudorotaxanes on the external surface of HMSs realize pH-responsive controlled release for corrosion inhibitor, caffeine molecules. The smart nanocontainers encapsulate caffeine molecules at neutral pH, and release the molecules either under acidic or alkaline conditions, which make them spontaneously experience the pH excursions arisen from corrosion process and respond quickly. The intelligent anticorrosion coating was deposited on the surface of aluminum alloy AA2024 and investigated by electrochemical impedance spectroscopy and scanning vibrating electrode technique (SVET). Compared with the pure SNAP coating, the well-dispersed smart nanocontainers not only delay the penetration rate of corrosive species but also repair damaged aluminum oxide layer to maintain the long term anticorrosion behavior. From the experimental results of SVET, the smart nanocontainers with the acid and alkaline dual stimuli-responsive characteristics can simultaneously suppress corrosion activities on microanodic and microcathodic regions, demonstrating an excellent self-healing functionality.

Self healing coatings containing dual active agent loaded urea formaldehyde (UF) microcapsules

“…This includes use of smart reservoirs [11], microcapsules [12], graphene [13][14][15], functional polymers [16], etc. In recent years many self healing chemistries and material systems have been developed to address this issue [17][18][19][20][21][22].…”

Smart Nanocontainers: Preparation, Loading/Release Processes and Applications

“…Regarding the nanostructures, nanocontainer can be divided into 3 main groups including: i) nanoparticles based nanomaterials (three-dimensional nanostructure) [1][2][3][4], ii) nanotubes (one dimension) [5][6][7][8], and iii) nanolayers based nanomaterials (two-dimensional nanostructure) [9][10][11]. Similarly, in terms of synthetic materials, nanocontainers consist of organic or inorganic scaffolds in which the encapsulation of active substances has been carried out.…”

Effect of Coating Thickness on a Solid-Liquid Two-Phase Flow Centrifugal Pump under Water Medium

“…Generally, coating material with better wear resistance, including epoxy resin mortar coatings [12] to [14], composite nylon coatings [15], polyurethane coatings [16] and other polymer coatings [17], sprayed on the surface of wet parts, is used to deal with the problem of the wear and tear of solid-liquid two-phase flow pumps. After spraying the coating, parameters such as the thickness and wrapping angle of pump impeller are changed, which has a significant influence on pump performance.…”