Superhydrophobic–superhydrophilic switchable wettability via TiO 2 photoinduction electrochemical deposition on cellulose substrate

Multi-functional MnO2 nanomaterials for photo-activated applications by a plasma-assisted fabrication route

“…S3 †). 7,35 As can be observed, the system behaviour became more hydrophilic upon irradiation, with a direct dependence on the deposition temperature. The Δ(WCA) value (difference between the initial and final contact angles) is in fact reduced from ≈80 to ≈20°upon going from 100°C to 400°C.…”

“…In addition, fluorine presence leads to a passivation of nanomaterial defects and, hence, to a reduced content of oxygen vacancies, 48,50,53 the key active sites for water chemisorption, with the formation of new -OH groups. 4,7,8,35 As a consequence, higher fluorine loadings result in an increased initial hydrophobicity. An additional concurrent contribution to the trend of the initial contact angles is provided by RMS roughness values, progressively increasing with the growth temperature ( Fig.…”

Silane coatings of metallic biomaterials for biomedical implants: A preliminary review

“…Several articles have shown how a superhydrophobic (water contact angle (θ a ) > 150 ° ) silane‐based coating on metal oxides can be degraded and rendered completely hydrophilic by exposure to UV radiation . The mechanism has been studied previously: UV radiation generates reductive functional groups on the metal surface (e.g., OH − and O 2− ), which consequently attract H atoms and C radicals from the silane film, rupturing the organic chain and dispatching hydrophobic functional groups from the surface.…”

“…Several articles have shown how a superhydrophobic (water contact angle (u a ) > 150 8 ) silane-based coating on metal oxides can be degraded and rendered completely hydrophilic by exposure to UV radiation. [180][181][182][183][184][185][186][187] The mechanism has been studied previously: [185][186][187] UV radiation generates reductive functional groups on the metal surface (e.g., OH 2 and O 22 ), which consequently attract H atoms and C radicals from the silane film, rupturing the organic chain and dispatching hydrophobic functional groups from the surface. As hydrophobicity is correlated with corrosive protection in silanes, rendering the silane hydrophilic will likely accelerate corrosion and consequently allow natural degradation of the underlying implant.…”

Electrochemical route to prepare polyaniline-coated meshes with controllable pore size for switchable emulsion separation

“…To satisfy different practical demands, smart materials as building blocks have been exploited to prepare interface materials with switchable wettability in response to various external stimuli [19][20][21][22][23][24][25][26][27][28]. For example, Wang and co-workers obtained smart surfaces comprising blocks of pH-responsive poly(2-vinlypyridine) and hydrophobic polydimethylsiloxane.…”