Self‐Supplying Liquidity Oil‐Adsorbed Slippery Smooth Surface for Both Liquid and Solid Repellency

Abstract

Inspired by pitcher‐plants, slippery liquid‐infused surfaces (LISs) comprised of a textured/smooth base‐layer and a liquid‐layer are an exciting emerging class of super‐repellent surfaces. Herein, a smooth LIS with a flat base‐layer is developed as a multifunctional tribosurface, which is termed a friction‐reducing liquidity oil‐adsorbed tribo‐surface (FLOAT). The FLOAT is constructed via a novel self‐supplying lubricant strategy from liquid‐adsorbed smooth surfaces based on π–COOH interactions at the interface between the solid base‐layer and the infused‐liquid‐layer, resulting in a drastic friction reduction. The FLOAT demonstrates a friction coefficient of 0.05 for loads less than the strength of the coating; for loads greater than or equal to the strength of the coating, a friction coefficient of 0.08 is achieved by holding the liquid‐layer between the FLOATs base‐layer and the friction object using a self‐supplying liquid‐layer based on the interactions of the phenyl groups at the selectively collapsing concaves of the coating. Furthermore, the FLOAT easily sheds off both viscous and viscoelastic materials, shows high transparency, and can be easily fabricated using a controllable patterning surface. The FLOAT demonstrated herein shows potential as a next‐generation tribosurface and provides new insights for the design of multifunctional liquid surfaces for various practical applications.

Life and death of liquid-infused surfaces: a review on the choice, analysis and fate of the infused liquid layer

“…19 More recently, similar systems have been reported, but instead, use polydimethylsiloxane (PDMS)/silicone oil combinations 20 or using π-π or π-COOH interactions to immobilise lubricants. [21][22][23] The second method to manufacture 1D LIS is to covalently attach long-chain molecules to the surface in such a way that they retain liquid-like features. This class of 1D LIS are known as Slippery Omniphobic Covalently Attached Liquid (SOCAL) surfaces 24 and has attracted much attention recently due to their potential to eliminate lubricant depletion.…”

Highly Efficient Self-Repairing Slippery Liquid-Infused Surface with Promising Anti-Icing and Anti-Fouling Performance

“…By changing the traditional solid− liquid interface ((super)hydrophobic/hydrophilic/omniphobic/amphiphilic surfaces) to a liquid−liquid interface, SLIPSs show a defect-free smooth surface with ultralow hysteresis and sliding angle. 21,22 Furthermore, these surfaces present excellent nonstick properties to numerous liquid/solid contaminants 23,24 and anti-icing, 25−27 anti-fouling, 28,29 and smart liquid transportation 30−32 performance.…”

“…SLIPS materials were mainly fabricated by infusing the lubricant oil into a rough structured substrate, thus forming a liquid layer over the surface to avoid the damage of the substrate rough structure. By changing the traditional solid–liquid interface ((super)­hydrophobic/hydrophilic/omniphobic/amphiphilic surfaces) to a liquid–liquid interface, SLIPSs show a defect-free smooth surface with ultralow hysteresis and sliding angle. , Furthermore, these surfaces present excellent nonstick properties to numerous liquid/solid contaminants , and anti-icing, − anti-fouling, , and smart liquid transportation − performance.…”

Green Superlubricity Enabled by Only One Water Droplet on Plant Oil-Infused Surfaces

“…Despite such advantages, however, the tribological properties of LISs are still poor due to the high friction coefficient of LISs, which exceeds that of conventional mineral lubricants, graphene-containing lubricants, and other lubricating materials. − There is, therefore, a need for a novel strategy to achieve superlubrication with a coefficient of friction below 0.01.…”