Seawater-responsive SiO₂ nanoparticles for in situ generation of zwitterionic polydimethylsiloxane antifouling coatings with underwater superoleophobicity

Abstract

Marine fouling caused by oily and biological pollutants is raising as an urgent issue around the world. Aiming at improving the static antifouling (AF) performance of polydimethylsiloxane (PDMS) coatings, a...

Hagfish‐inspired Smart SLIPS Marine Antifouling Coating Based on Supramolecular: Lubrication Modes Responsively Switching and Self‐healing Properties

“…because of high teratogenicity, ecofriendly, and efficient marine antifouling coatings are still extensively studied to this day. [4,5] Many antifouling coatings have been developed in this battle against marine fouling, such as self-polishing coating, [6][7][8] low surface energy (SE) coating, [9][10][11][12] micro-structured coating, [13][14][15] hydrophilic coating, [4,16,17] hydrophobic coating, [18][19][20][21] amphiphilic coating, [7,8,22] antifoulant release coating, [9,23] dynamic biodegradable coating, [16,24,25] slippery liquid-infused porous surface (SLIPS), [26][27][28][29][30] bactericidal coating, [23,31] mimic peptide coating, [32] fluorescent coating, [33] and so on. Among these methods, SLIPS has attracted continuous attention because of low SE, low Young's modulus, and dynamic antifouling surface.…”

Silicone Elastomer with Self-Generating Zwitterions for Antifouling Coatings

“…Regarding the PDMS tTCBF- x coatings, a new band attributed to −COO – can be observed at 1560 cm –1 , indicating that the dodecafluoroheptyl ester group is hydrolyzed into negatively charged carboxyl group and the tertiary amines in the polymer were protonated . The strong absorption peak at 1641 cm –1 is attributed to the bending vibration of water molecule, which is somewhat overlapped with the characteristic carboxyl peak around this wavenumber. − Furthermore, the band at 3410 cm –1 is attributed to −OH from the hydration of the zwitterions. After normalization with the absorption peak at 2960 cm –1 , the integrated intensity of the −COO – region at 1560 cm –1 for PDMS tTCBF-30 and 20 are 4.3 and 2.6 times that of PDMS tTCBF-10, respectively, indicating that more zwitterions are generated on the surface.…”

“…Figure shows the fluorescence microscopy images of the antibacterial assays and the relative bacterial settlement (RBS) on the surfaces. Zwitterionic polymers are fouling-resistant polymers that prevent the adsorption of bacteria instead of killing them . A large number of live bacteria were observed on the surfaces of the blank silicon wafer as well as the PDMS before and after hydrolysis (∼99% bacterial adhesion), indicating that the fouling pressure was high and that PDMS is highly subjected to bacterial settlement.…”

“…Zwitterionic polymers are foulingresistant polymers that prevent the adsorption of bacteria instead of killing them. 39 A large number of live bacteria were observed on the surfaces of the blank silicon wafer as well as the PDMS before and after hydrolysis (∼99% bacterial adhesion), indicating that the fouling pressure was high and that PDMS is highly subjected to bacterial settlement. Without prehydrolysis in ASW, the PDMS tTCBF-x coatings showed a similar bacterial settlement (Figure 6a) to PDMS, which resulted from the hydrophobic surfaces without zwitterions.…”

Dually reactive multilayer coatings enable orthogonal manipulation of underwater superoleophobicity and oil adhesion via post-functionalization

“…Building on this work, several such artificial interfaces have been developed, primarily using polymeric hydrogels, electrostatic multilayers, and metal oxides. 5–14 Although these conventional underwater superoleophobic surfaces have found potential use in oil separation, the real-time monitoring of human respiration, and as anti-biofouling interfaces and efficient microfluidic devices, 15–23 their oil adhesion, and the consequent oil droplet mobility on these underwater superoleophobic surfaces (reflected as a change in the CAH or the roll-off angle), cannot be tuned while retaining their underwater superoleophobicity (OCA > 150°).…”