Synthesis of ‘reactive’ and covalent polymeric multilayer coatings with durable superoleophobic and superoleophilic properties under water

Abstract

‘Amine-reactive’ multilayers of a nano-complex are introduced by exploiting the Michael addition reaction to adopt ‘internal’ super-oil-wettability under water with impeccable physical/chemical durability.

Selective Cooperation with Liquids for Environmentally Friendly and Comprehensive Oil–Water Separation

“…Thiss uper-oil-absorption performance remained unperturbed at extremes of temperature (100 8Ca nd 10 8C), under pressure, and even after the prolonged (7 days) exposures to chemically harsh (extremes of pH, sea water,r iver water,s urfactant-contaminated water,e tc.) [30] Then, ar apid growth of this "reactive" NC was achieved through strategic incorporation of salt, and this approachw as furthere xtended for controlled and extreme modulation of both the oil-wettability under water and waterwettability in air,r espectively. Examples of such materials that have unique oil-absorption ability and outstanding durability are unprecedented in the literature.…”

“…Moreover,t he same materialw as exploitedi n separation of oil droplets from ii)oil-in-water (o/w) emulsions through both filtration and absorption process at extremes of temperature, which could be useful in removing oily contaminants from aqueous media in diverse and practically pertinent conditions. [30,31] Next, we covalently modified the multilayer-coated cotton with octadecylamine (ODA)m olecules (having long-chain hydrocarbon, ÀC 18 H 37 )b ye xploiting the residuala crylate groupst hat are present in the multilayer coating. [30] After post-chemical modification with appropriate primary amine-containing small molecules, the NC multilayersw ere capable of displaying both underwater superoleophilicity and superoleophobicity with exemplary physical durability.…”

“…In recent past, we exploited af acile and robustM ichael addition reaction( Figure 1A)b etween aliphatic amine and acrylate moieties for the synthesis of a" reactive" and polymeric nanocomplex (NC), which was further strategically associated into "reactive" and covalentm ultilayerso fN Co na planar substratet hrough consecutive 1, 4-conjugate addition reactioni ne thanol. [30] After post-chemical modification with appropriate primary amine-containing small molecules, the NC multilayersw ere capable of displaying both underwater superoleophilicity and superoleophobicity with exemplary physical durability. [30] Then, ar apid growth of this "reactive" NC was achieved through strategic incorporation of salt, and this approachw as furthere xtended for controlled and extreme modulation of both the oil-wettability under water and waterwettability in air,r espectively.…”

“…[30] After post-chemical modification with appropriate primary amine-containing small molecules, the NC multilayersw ere capable of displaying both underwater superoleophilicity and superoleophobicity with exemplary physical durability. [30] Then, ar apid growth of this "reactive" NC was achieved through strategic incorporation of salt, and this approachw as furthere xtended for controlled and extreme modulation of both the oil-wettability under water and waterwettability in air,r espectively. [31] Here, we designedasustainable super-oil-absorbentt hrough appropriate association of a naturallya bundant fibrous substrate and "reactive"m ultilayers of NC for facile ande nvironmentally friendly removal of different forms of oil spills at practically relevant diversea nd severe conditions.…”

“…The appearance of the IR peak at 1409cm À1 ,w hich corresponds to the symmetric stretching of the CÀHb ondf or the b carbon of the vinyl groups, unambiguously confirmed the presence of acrylate groups in the multilayers coatingo nt he fibrousc otton. [30,31] Next, we covalently modified the multilayer-coated cotton with octadecylamine (ODA)m olecules (having long-chain hydrocarbon, ÀC 18 H 37 )b ye xploiting the residuala crylate groupst hat are present in the multilayer coating. This post-chemical modification was furthere xamined with FTIR analysis, in which the intensity of the IR peak at 1409 cm À1 was significantly depleted with respectt ot he car- bonyl stretching at 1737cm À1 (Figure S2 O), mainly owing to the mutual reactionb etween the residual acrylate groups and primary amine groups from ODA molecules.…”