Abstract
Slippery lubricant-infused porous surfaces (SLIPs) are effective in repelling low-surface tension fluids given their omniphobicity, anti-adhesive, and drag reduction properties. However, over time, SLIPs are subjected to lubricant losses and undergo dust fouling. In this research, we address these challenges by developing a new slippery covalently attached liquids (SCAL) surface. SCALs was composed of a molecularly-thick lubricant layer covalently bound to the solid support, generating long-lasting anti-fouling, hydrophobic and slippery effects. We show that our SCALs exhibit ultra-low contact angle hysteresis for a wide range of fluids and enable reduced colloidal forces in the vertical and lateral directions (adhesion and friction, respectively). In parallel, the SCALs exhibit a high resistance to contamination (from molecular adhesion to dust fouling), mechanical integrity, and light transmission. Overall, we introduce a facile, cost-effective, and scalable process to synthesize a SCALs system suitable to the demands of application in bioengineering, power generation and water harvesting.
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