Fluorinated Metal–Organic Coatings with Selective Wettability

Abstract

Surface chemistry is a major factor that determines the wettability of materials, and devising broadly applicable coating strategies that afford tunable and selective surface properties required for next-generation materials remains a challenge. Herein, we report fluorinated metal− organic coatings that display water-wetting and oil-repelling characteristics, a wetting phenomenon different from responsive wetting induced by external stimuli. We demonstrate this selective wettability with a library of metal−organic coatings using catechol-based coordination and silanization (both fluorinated and fluorine-free), enabling sensing through interfacial reconfigurations in both gaseous and liquid environments, and establish a correlation between the coating wettability and polarity of the liquids. This selective wetting performance is substrate-independent, spontaneous, durable, and reversible and occurs over a range of polar and nonpolar liquids (60 studied). These results provide insight into advanced liquid−solid interactions and a pathway toward tuning interfacial affinities and realizing robust, selective superwettability according to the surrounding conditions.

Droplet Bouncing: Fundamentals, Regulations, and Applications

“…The properties of the surrounding liquid‐like viscosity and density may thus influence dynamics of the droplet impact significantly. The bouncing in liquids also requires underliquid wettability of the solid surface, [ 244 ] which count on the advance of mechanism study and the technology of fabricating non‐wetting solid surfaces.…”

Hierarchical Self‐Assembly of Adhesive and Conductive Gels with Anion‐Coordinated Triple Helicate Junctions

“…The contact angle varied from 73.8°to 85.8°as the surface was altered from G NH2 to G Hept (Figure S49), revealing the tunable wettability of the gels when acting as coating materials. The results provide a coating strategy to achieve selective wettability for on-demand practical applications, [23] such as chemical sensing, [24] membrane separations, [25] and self-cleaning. [26] Triphenylamine and its derivatives are well-known for their use as hole-transport materials, electrical conductivity and electroluminescence.…”

Exploiting Molecular Dynamics in Composite Coatings to Design Robust Super‐Repellent Surfaces

“…The interfacial design of materials to achieve desirable macroscopic properties is of significance in the engineering of advanced functional surfaces. Surfaces and interfaces that maintain high‐performance or sustained stability after contacting small droplets, bulk liquids, or impinging fluids have found extensive potential in diverse applications including power generation, [ 1 ] high‐speed wrapping and assembly, [ 2 ] solvation or dehydration, [ 3 ] membrane separations and conductions, [ 4 ] biomechanics and robotics, [ 5 ] self‐cleaning, [ 6 ] and antifouling and accretion control. [ 6b,7 ] Specifically, repellent surfaces are a class of surfaces featuring nonwetting/nonfouling properties, which can find extensive applications in fields requiring reduced drag, low‐fouling, enhanced cargo loading, and/or controlled liquid transportation, e.g., the exploration of oceans and their resources using realiable carriers with high‐performance repellent coatings.…”