Self‐Healing and Antifouling Multifunctional Coatings Based on pH and Sulfide Ion Sensitive Nanocontainers

Abstract

Application of mesoporous silica nanoparticles (MSNs) as delivery tools for self-healing coatings is limited by spontaneous leakage and specifically responsive release of small molecular inhibitors. In this work, a pH/sulfide ion responsive release system based on MSNs using a Cu-BTA complex forms at the openings of the mesopores into which BTA (corrosion inhibitor) and benzalkonium chloride (biocide) are loaded. The spontaneous leakage of active species is completely avoided and premature release of the loaded composition was lowered to 0.02. The responsive release begins when the pH is lower than 5 or [S^2-] is higher than 0.02 mM (about 0.6 ppm). The hybrid coating containing the responsive release system exhibits feedback self-healing property sensitive to lowering of pH and sulfide ion concentration and, at the same time, provides a high barrier level for a long time. Due to incorporation of biocide in the release system, the coating is also provided with antifouling properties

Antimacrofouling Efficacy of Innovative Inorganic Nanomaterials Loaded with Booster Biocides

“…Szabó et al [18] microencapsulated Cu 2 O and measured the adhesion of organisms on the applied surfaces by Acridine Orange Staining. Interestingly, Zheng et al [19] developed pH/sulfide ion multifunctional released nano-carriers and loaded them with bacterial agents, thus resulting in anti-bacterial activity. The above examples, among others, demonstrate the potential application of encapsulating biocides for antifouling purposes.…”

Antifouling and antibacterial hydrogel coatings with self-healing properties based on a dynamic disulfide exchange reaction

“…The first one is based on an irreversible system containing micro/nano-reservoirs, the cracking of which releases the healing reagents. [12][13][14] In this case, the materials can only heal 40 once. The other strategy is based on reversible bonding systems.…”

Smart Nanocontainers: Preparation, Loading/Release Processes and Applications

“…Several biocides have been loaded into the nanocontainers, such as zinc pyrithione and copper pyrithione [98], benzalkonium chloride [99], mercaptobenzothiazole and 4,5-Dichloro-2-octyl-4-isothiazolin-3-one (DCOIT) [100], commercial antifouling compounds [101].…”