Underwater Superoleophobicity: Nacre‐Inspired Mineralized Films with High Transparency and Mechanically Robust Underwater Superoleophobicity (Adv. Mater. 11/2020)

Abstract

In article number 1907413, Shutao Wang, Bailiang Wang, Jingxin Meng, and co‐workers prepare a transparent and mechanically robust underwater superoleophobic film by combining superspreading and biomineralization. The nacre‐like composition and structures significantly improve the mechanical properties of the film, imparting a robust underwater superoleophobicity and ultralow oil‐adhesion. Such films can be coated on different transparent materials and have promising applications in areas such as underwater optics and biological imaging.

Dynamic Nanoconfinement Enabled Highly Stretchable and Supratough Polymeric Materials with Desirable Healability and Biocompatibility

“…Many natural materials such as nacre, [10,11] bones, [12] and spider silk fibers (SSF) [13] are valid examples of how the evolutionary forces address the issue of the trade-off between mechanical strength and stretchability. In particular, SSF exhibits an outstanding fracture toughness over 150 J g −1 and a large breaking strain (>50%) as well as high tensile strength (>1 GPa).…”

“…For example, in addition to the lack of a selfhealing ability, existing artificial ligament materials usually suffer from lower ductility and/or toughness relative to natural counterparts. [8,9] Therefore, it has been highly attractive but remained a grand challenge to create strong, tough, and ductile polymeric materials that are also healable and biocompatible so far.Many natural materials such as nacre, [10,11] bones, [12] and spider silk fibers (SSF) [13] are valid examples of how the evolutionary forces address the issue of the trade-off between mechanical strength and stretchability. In particular, SSF exhibits an outstanding fracture toughness over 150 J g −1 and a large breaking strain (>50%) as well as high tensile strength (>1 GPa).…”

Robust and durable liquid-repellent surfaces

“…Sandpaper abrasion (Fig. 22c) is probably the most widely selected mechanical durability testing method in the literature, 43,54,67,244,[352][353][354][355][356][357] as it does not require specialized or professional equipment, and can offer quantitative analysis of the robustness. Typically, the liquid-repellent surface is placed face-down to a sandpaper, and a loading is applied on the solid substrate to provide normal pressure, then the substrate is moved along the tangential direction with a certain speed and distance.…”

“…24f and g). 67,409,410 The prepared film was composed of aragonite platelets as the inorganic component and chitosan derivative as the organic framework, and showed outstanding robustness and durability in terms of long-term immersion in high salt solution or seawater, and intensive impingement by falling sands (Fig. 24h).…”

Recent Advances in Photocatalysis Based on Bioinspired Superwettabilities

“…Usually, a surface showing (super)­hydrophilic ability in air also demonstrates superoleophobicity underwater. − In an aqueous environment, water quickly spreads over a (super)­hydrophilic substrate to form a stable water layer, which integrates with original sufficient roughness to realize superior oil repellency (Figure a). The heavy oils (density, ρ oil > ρ water ) usually exist on the (super)­hydrophilic surface in water to give (super)­oleophobicity. − For the light oils (density, ρ oil < ρ water ), − the oil-repelling performance is tested through dripping such organic solvents below the surface.…”